Questions Asked on
September 26, 2010

chemistry
20) The ideal value of i (van't Hoff factor) for (NH4)3PO4. A) 2 B) 5 C) 4 D) 3 E) 1 I know the answer but how are problems like this figured out?
asked by Jessie 
chem
The concentration (M) of HCl in a solution prepared by dissolving 5.5 g of HCl in 200 g of C2H6O is ?????? M. The density of the solution is 0.79 g/mL. A) 21 B) 0.93 C) 6.0 × 104 D) 1.72 E) 0.58
asked by benju 
college chemistry
How many total moles of ions are released when the following sample dissolves completely in water: 5.15x10^3 g Ca(NO3)2
asked by KELLY 
chem
What is the freezing point (°C) of a solution prepared by dissolving 11.3 g of Ca(NO3)2 (formula weight = 164 g/mol) in 115 g of water? The molal freezing point depression constant for water is 1.86 °C/m. whats wrong with my answer: molal: 0.069 moles
asked by jessie 
physics
a 1500 kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average power delivered to the engine?
asked by shnook 
Astronomy
Which of these gasses are outgased by our volcanic eruptions? a)oxygen, methane,ammonia b)carbon dioxide, water vapor, oxygen c)ammonia, water vapor, oxygen d) water vapor, methane, carbon dioxide e)helium, carbon dioxide, methane
asked by Jerrika 
CHEMISTRY
45) George is making spaghetti for dinner. He places 4.01 kg of water in a pan and brings it to a boil. Before adding the pasta, he adds 58 g of table salt to the water and again brings it to a boil. The temperature of the salty, boiling water is _ _ _ _
asked by hjw 
CHemistry
The concentration of sodium chloride in an aqueous solution that is 2.23 M and that has a density of 1.01 g/mL is __ % by mass.
asked by JBS 
geometry
gk bisects
asked by Si 
calculus
At what points does the helix r = sin(t), cos(t), t intersect the sphere x 2 + y 2 + z 2 = 37? (Round your answers to three decimal places. Enter your answers from smallest to largest zvalue.)
asked by Anonymous 
PreCalc
A rectangular package to be sent by a delivery service can have a maximum combined length and girth (perimeter of a cross section) of 120 inches. a. Show that the volume of the package is V(x)= 4xsquared(30x) b. Use your graphing calculator to find the
asked by Hannah 
General Chem.
FeCo3 Calculate the mass percent composition of iron for the third one of these iron ores.
asked by emily chambers 
ghemistry
which indicator is more reliable in the titration of H3PO4 with NaOH using methyl orange and phenolphthalein as indicators
asked by gina 
chemistry
How many grams of lead(II) iodate, Pb(IO3)2 (formula weight = 557.0 g/mol), are precipitated when 3.20 × 102 mL of 0.285 M Pb(NO3)2(aq) are mixed with 386 mL of 0.512 M NaIO3(aq) solution? The unbalanced equation of reaction is: Pb(NO3)2(aq) + NaIO3(aq)
asked by Diggs 
general chemisty
Calculate the freezing point of a solution of 20.0 g methyl salicylate, C7H6O2, dissolved in 800 g of benzene, C6H6. Kf for benzene is 5.10°C /m and the freezing point is 5.50°C for benzene. A) 1.05°C B) 1.05°C C) 4.45°C D) 6.54°C
asked by Amy 
C hemistry
An unknown compound contains only carbon, hydrogen, and oxygen . Combustion of 2.50 g of this compound produced 3.67 g of carbon dioxide and 1.50 g of water. What is the empirical formula of a substance that contains 8.33×10−2 mol of carbon, 0.167 mol
asked by isoka 
Chemistry
A reaction of the form aAproducts is secondorder with a rate constant of 0.225 L/(mol/s). If the initial concentration of A is 0.293 mol/L, what is the molar concentration of A after 35.6 secs?
asked by Yesenia 
Chemistry
How many molecules are in 2.6 grams of H2O?
asked by Bob 
ap history
when did american economic institutions began to be shaped in a capitalist framework? A.during the colonial period B.during the federalist era C.during the jacksonian era D.during the civil war E.during the late 1890s
asked by lala 
Physics
A football player, starting from rest at the line of scrimmage, accelerates along a straight line for a time of 1.5 s. Then, during a negligible amount of time, he changes the magnitude of his acceleration to a value of 1.4 m/s2. With this acceleration, he
asked by Amanda 
psy
Looking to increase the profits of his lemonade stand, Johann doubled the price of a cup of lemonade from 25 cents to 50 cents. This clearly shows Johann’s lack of business sense, for now he’ll almost certainly sell fewer cups at the new price and
asked by jrhargr 
phy
A vertical spring (ignore its mass), whose spring stiffness constant is 1000 N/m, is attached to a table and is compressed down 0.130 m. (a) What upward speed can it give to a 0.200 kg ball when released? m/s (b) How high above its original position
asked by mas 
Chemistry
A solution is prepared by dissolving 23.7 g of CaCl2 in 375 g of water. The density of the resulting solution is 1.05 g/mL. The concentration of Cl in this solution is __________ M. can someone help me? how do i get to M?
asked by BenY 
chemistry
The molarity of urea in a solution prepared by dissolving 16 g of urea (MW = 60.0 g/mol) in 39 g of H2O is __________ M. The density of the solution is 1.3 g/mL. i get 8.9 but the practice test says the answer its 6.3
asked by BenY 
chemistry
How many grams of sucrose,C12H22O11 must be dissolved in 750.mL of water to prepare a 0.250 molal solution?
asked by india 
social studies
what kind of landform covers the central part of North America
asked by dee 
physics
A stone thrown off a bridge 20 m above a river has an initial velocity of 12 m/s at an angle of 450 above the horizontal. a. What is the range of the stone? b. At what velocity does the stone strike the water? (magnitude and direction)
asked by Val 
Chemistry
The vapor pressure of liquid chloroform, CHCl3, is 400.0 torr at 24.1 degrees Celsius and 100.0 torr at 6.3 degrees Celsius. What is delta Hvap of chloroform?
asked by Patrick 
Statistics
12.22 A regression was performed using data on 16 randomly selected charities in 2003. The variables were Y = expenses (millions of dollars) and X = revenue (millions of dollars). (a)Write the fitted regression equation. (b)Construct a 95 percent
asked by Kim 
Physics  Inelastic Collision ( check + help)
A billiard ball of mass 0.55kg moves with a velocity of 12.5m/s towards a stationary billiard ball of the identical mass and strikes it with a glancing blow. The first billiard ball moves of at an angle of 29.7deg clockwise from its original direction,
asked by Shaila 
Physics
Emily challenges her husband, David, to catch a $1 bill as follows. She holds the bill vertically, with the center of the bill between David's index finger and thumb. David must catch the bill after Emily release it without moving his hand downward. If his
asked by stacy 
physics
Two charged spheres are 5.25 apart. They are moved, and the force on each of them is found to have been tripled. how far apart are they now?
asked by Anonymous 
algebra with pizazz pg 40 riddle
what is the riddle answer??? missed lesson don't get it!!! please help in diar need!!!! question is... why do girls like guys who wear shirts with eight buttons?
asked by poop 
Math  Instantaneous and average rates of change
a) Describe a graph for which the average rate of change is equal to instantaneous rate of change for its entire domain. Describe a real life situation that this graph could represent. b) Describe a graph which the average rate of change between two points
asked by Shaila 
Chemistry
Lead has four stable isotopes. ^204Pb (1.4%), ^206Pb (24.1%). ^207Pb (22.1%) and ^208Pb (52.4%). Find the atomic mass of ^208 Pb given that ^204Pb has an atomic mass of 203.973 amu, ^206Pb has an atomic mass of 205.974 amu, and ^207Pb has an atomic mass of
asked by Gigi 
phy
A baseball (m = 145 g) traveling 45 m/s moves a fielder's glove backward 15 cm when the ball is caught. What was the average force exerted by the ball on the glove? find Magnitude
asked by mas 
statistics
Assume that about 45% of all U.S. adults try to pad their insurance claims. Suppose that you are the director of an insurance adjustment office. Your office has just received 110 insurance claims to be processed in the next few days. What is the
asked by Randy 
math
three circles are externally tangent to each other. The radius of each circle is 6 inches. Find the following: a)the length of the shortest wire athat goes around them. b) the shaded area (space between them when stacked one circle on top of two)
asked by donna 
statistics
A student takes a 20question, true/false exam and guessed on each question. Find the probability of passing if the lowest passing grade is 15 correct out of 20.
asked by Lori 
History
What problems did medieval towns face? How did medieval europeans attempt to deal with those problems? How did an independant judiciary and common law in England help to protect individual rights?
asked by Hi 
Math Surveying
Hey, I need help working these problems. Thanks you. 1) A 50m tape is used to measure between two points. The average weight of the tape per meter is 0.320 N. If the measured distance is 48.888 m, with the tape supported at the ends only and with a
asked by Mason 
chemistry
What is the empirical formula of a substance that contains 8.33×10−2 mol of carbon, 0.167 mol of hydrogen, and 8.32×10−2 mol of oxygen?
asked by Anonymous 
Stat
An insurance company insures a person's antique coin collection worth $20,000 for an annual premium of $300. If the company figures that the probability of the collection being stolen is 0.002, what will be the company's expected profit?
asked by Lori 
phy
A baseball (m = 145 g) traveling 45 m/s moves a fielder's glove backward 15 cm when the ball is caught. What was the average force exerted by the ball on the glove? find Magnitude
asked by mas 
math
the ratio of the distances a 7iron and a 5 iron will dirve a golf ball is 5 to 6. if a golfer averages 153 yards with a 7 iron, how far should he averages with a 5iron?
asked by Anonymous 
Psydagstat
An insurance company insures a person's antique coin collection worth $20,000 for an annual premium of $300. If the company figures that the probability of the collection being stolen is 0.002, what will be the company's expected profit?
asked by Lori 
chemistry
Hydrogen cyanide, HCN, can be made by a twostep process. First, ammonia is reacted with O2 to give nitric oxide, NO. 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) Then nitric oxide is reacted with methane, CH4. 2 NO(g) + 2 CH4(g) → 2 HCN(g) + 2 H2O(g) +
asked by caroline 
Statistics
A statistics practitioner determined that the mean and standard deviation of a data set were 120and 30, respectively. What can you say about the proportions of observations that lie between each of the following intervals? a. 90 and 150 b. 60 and 180 c. 30
asked by Rhea 
CHEMISTRY
A solution is prepared by dissolving 15.0 g of NH3 in 250 g of water. The density of the resulting solution is 0.974 g/mL. The mole fraction of NH3 in the solution is __________. A) 16.8 B) 0.940 C) 0.0597 D) 0.922 E) 0.0640
asked by Jessie 
physics
Two charged spheres are 5.25 apart. They are moved, and the force on each of them is found to have been tripled. how far apart are they now?
asked by Anonymous 
Physics
A helicopter is lifting off from the ground and is moving vertically upward. The graph shows its vertical velocity vy versus time. How high is the helicopter after 7 s have elapsed?
asked by Lily 
phy
A sled is initially given a shove up a frictionless 27.0° incline. It reaches a maximum vertical height 1.45 m higher than where it started. What was its initial speed?
asked by mas 
Teachers Aide/Language and other Barriers
13. In an ESL classroom, teacher aides should prepare themselves to A. learn or become familiar with appropriate languagerelated software programs. B. handle all disciplinary measures that arise on behalf of the teacher. C. counsel parents regarding their
asked by AspiringTeacherandMotherofFour 
Calc
Use a table of values to estimate the value of the limit. lim (tan 3x/tan 5x) x> 0 I have no clue what to do. Could someone please explain how to go about this problem.
asked by CMM 
maths
a light house flashes every 56 seconds. Another lighthouse flashes every 40 seconds. At 9 p.m. they both flash t the same time. What time will it e when they next both flash at the same time?
asked by chelsea 
chemistry
A 1.500g sample of a mixture containing only Cu2O and CuO was treated with hydrogen to prduce 1.252 g pure copper metal. Calculate the percentage composition (by mass) of the mixture.
asked by kelly 
science
A bat flying in a cave emits a sound and receives its echo 0.4 s later. How far away is the cave wall? Assume the speed of sound to be 340 m/s. Answer in units of m.
asked by amber 
Physics
Two very small spheres are initially neutral and separated by a distance of 0.50 m. Suppose that 2.50 x 10^13 electrons are removed from one sphere and placed on the other. What is the magnitude of the electrostatic force that acts on each sphere?
asked by Melissa 
chemistry
If the total mass of a vehicle is due to 56Fe, what mass of a 1.4 metric ton (tonne) automobile is due to the electrons?
asked by ducky 
English 2
1. Which of the following sentences contains an implied metaphor? a. The mall sailboat bobbed about like a cork on the huge ocean b. The wind looked down upon the tiny craft, laughed, and then attacked. c. The battle between wind and boat raged on for an
asked by mysterychicken 
General Chemistry
The burning of the magnesium becomes uncontrolled (its burns brightly). Oops! How will this procedural error affect the reported mole ratio of magnesium to oxygen in the analysis? Explain. Mass of crucible and lid 23.96g Mass of Sample (Mg) .1018g Heating
asked by autum 
phy
Jane, looking for Tarzan, is running at top speed (4.3 m/s) and grabs a vine hanging vertically from a tall tree in the jungle. How high can she swing upward?
asked by mas 
physics
A novice golfer on the green takes three strokes to sink the ball. The successive displacements are 3.80 m to the north, 1.80 m northeast, and 1.00 m at 25.0° west of south. Starting at the same initial point, an expert golfer could make the hole in what
asked by Lexi 
physics
A ball is thrown horizontally from a 15m high building with a speed of 8.0m/s. How far away from the base of the building does the ball hit the gnd. I'm needing help setting this up. I know change of Y is 15m, and the "a" is 9.8m/s^2, but i get lost
asked by danny 
chemistry
what fraction of the total mass of an 56Fe atom is due to the electrons?
asked by ducky 
statistics
In a standard Normal model, what value of z cut off the region described as the lowest 1.5%?
asked by Jamie 
History
Describe the role of guilds in the trade and production of goods. How did trade and commerce grow during the middle ages?
asked by Hi 
math
why do we use reciprocal in math?
asked by marie 
ap history
one reason for the development of indenture employed in the early colonial period was A.a desire to produce traffic slaves B.parliaments refusal to allow skilled craftmen to emigrate C.the lack of trained domestic help on the large patroon estates along
asked by lu 
Physics
You step onto a hot beach with your bare feet. A nerve impulse, generated in your foot, travels through your nervous system at an average speed of 113 m/s. How much time does it take for the impulse, which travels a distance of 1.50 m, to reach your brain?
asked by Amanda 
chemistry
what flaws exist in Dalton's model of the atom?
asked by jenny 
Europe
What role did the geography of Europe play in the development of and ways of life in these towns?
asked by Hi 
history
which statement was not used by the british government to justify taxing the colonies after 1763? A.the british national debt had increased as a result of the french and indian war B.heavy administrative expenses were associated with maintaining the empire
asked by ciara ross 
Biology
The type of cartilage associated with bone function and development is what? I know that the elastic cartilage contains elastin which allows for elasticity and maintains shape of certain structures. Fibro is strong and rigid (strongest of 3) Hyaline
asked by Lena 
chemistry
why is temperature of H2O2 measured in the graduated cylinder?
asked by Joseph 
Europe
Describe the role of guilds in the trade and production of goods. How did trade and commerce grow during the middle ages?
asked by Hi 
Bio
The type of cartilage associated with bone function and development is what? I know that the elastic cartilage contains elastin which allows for elasticity and maintains shape of certain structures. Fibro is strong and rigid (strongest of 3) Hyaline
asked by Lena 
acct.
how will I journalize this transaction? Rented a backhoe to Mission Landscaping at a price of $250 per day, to be paid when the backhoe is returned. Mission Landscaping expects to keep the backhoe for about two or three weeks
asked by sha 
Statistics
How do frequency tables, relative frequencies, and histograms showing relative frequencies help us understand sampling distributions? A. They help us to measure or estimate of the likelihood of a certain statistic falling within the class bounds. B. They
asked by Randy 
CHEMISTRY
THE FOLLOWING SOLUTIONS AREMIXED TOGETHER: 121mL OF 1.54 M AgNO3 AND 45mL OF 1.07 M K2SO4 CALCULATE THE MOLAR CONCENTRATION OF Ag+ IONS IN THE FINAL SOLUTION
asked by KELLY 
Physics
you push with a 40N horizontal force on a 2kg box of coffee resting on a horizontal surface. The force of friction on the box is 12 N. Show that the acceleration is 4 m/s^2
asked by Tia 
Algebra
Could someone help me with this question Simplify the rational expression. (3x^2y+9xy^212y^3)/(36x^3y27x^2y^29xy^3)
asked by Alex 
11th grade
What percent is 1.25 of 82
asked by Anonymous 
chemistry
what fraction of the total mass of an 56 Fe atom is due to the electrons? The mass of a proton is 1.673 x1024 g, of a neurton 1.675 x 1024 g, an of an electron 9.109 x 1028g.
asked by ducky 
World History
how were the first civilizations similar and different?
asked by Christina 
CHEM KINETICS
this is a text book question that i cannot figure out. the decomposition of dimethyl ether at 510 degrees is a firstorder process with a rate constant of 6.8*10^4. (CH3)2O(g)> CH4(g) + H2(g) + CO(g) if the partial pressure of (CH3)20 is 18kPa, what is
asked by lucylu 
french
Hey, Can someone take a look at my french below, and let me know what corrections / changes I need to make please? French  Specialites: Cafe, creme beignet, et pate de francais English  Specialities: Coffee, Donuts (do I just add an s to beignet in
asked by Adrien 
chemistry
what experimental evidence led Thomson to conclude that cathode rays were negatively charged?
asked by ducky 
physics
A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 23.0° below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a
asked by Jim 
medical billing and coding
explain how evaluation and management (EM) codes are grouped
asked by given 
Algebraic propertie help?
(6+1)+7 Can be written the same was as =6+(1+7) But.. what propertie would that be? as in inverse, communative, etc.. I really don't get this
asked by Annalisa 
algebra
solve for g1: F = kg1g2/r2
asked by p 
English/General Knowledge
What are some of the social issues in today's society? I'm supposed to make an Advocacy speech to effect positive changes on a social issue.
asked by Alex 
Chemistry
How would you prepare a 250 mL solution of . 45 M from a stock solution of 5.5 M?
asked by Jrich 
physics
please HELP!!! What is the magnitude of the momentum of a baseball (m = 1.450 kg) traveling at a speed of 102 mi/h? Express your answer in SI units. I am unsure where to start
asked by bill 
sculpture
if gianlorenzo bernini's apollo and daphne were to be moved from the galleria borghese in rome where it now stands into the the ufizzi gallery, the most ideal place to install it would be?
asked by cassie 
Physics
An artillery shell is fired with an initial velocity of 300 m/s at 65.0° above the horizontal. To clear an avalanche, it explodes on a mountainside 37.5 s after firing. What are the x and y components of the shell where it explodes, relative to its firing
asked by Casey 
CHEM
How many significant figures does 79,500 have?
asked by SAMMMMMM 
Science
Is rubbing alcohol a pure substance or a mixture?
asked by Erika 
accounting
Assignment Please prepare the homework problems in the form of a Word and/or Excel file. Try to use one file to submit your answers if possible and include the questions with your answers. You must show your calculations. A dermatology clinic expects to
asked by Doloes 
math
A video game store charges a monthly membership fee of $7.50 but the charge to rent each movie is only $1.00 per movie. Another store has no membership fee but it costs $2.50 to rent each movie. How many movies need to be rented each month for the total
asked by jose 
Math
Two sides of a triangle are x + 2cm and 2x3cm. If the perimeter is 5x + 7cm, what is the third side?
asked by Kearra 
College Am. History
Describe meetings that resulted in the Japanese seeing “RollsRoyce, RollsRoyce, Ford,” and how was this part of Americans “clamoring for the outlawry of war.”
asked by Breanna 
Chemistry
Both calcium sulfate and magnesium sulfate can form hydrates with water. Could white anhydrous CaSO4 or MgSO4 be substituted for anhydrous CuSo4? Why or Why not?
asked by HELP!!! 
phy
A 900 kg car rolling on a horizontal surface has speed v = 70 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.2 m. What is the spring stiffness constant of the spring?
asked by mas 
Statistics
he Oil Price Information Center reports the mean price per gallon of regular gasoline is $ 3.79 with a population standard deviation of $ 0.18. Assume a random sample of 40 gasoline stations is selected and their mean cost for regular gasoline is computed.
asked by John 
Math Surveying
Need help working this problem. Thanks in advance! 1) A 50m tape is used to measure between two points. The average weight of the tape per meter is 0.320 N. If the measured distance is 48.888 m, with the tape supported at the ends only and with a tension
asked by Mason 
physicssss
Ball is thrown vertically upward with a speed of 25.0 m/s. What is it's velocity when it returns to the level from which it had started ? After computations: The ball reaches its highest pt at 32.4 meters. It takes the ball 2.55sec to reach its highest pt.
asked by CHELsea 
11th phyics
An automobile with an initial speed of 4.56 m/s accelerates uniformly at the rate of 2.4 m/s2. Find the final speed of the car after 4.4 s. Answer in units of m/s
asked by Taylor 
physics
You are given a vector in the xy plane that has a magnitude of 100.0 units and a y component of 45.0 units. What are the two possibilities for its x component?
asked by Kathy 
Chem
(b) If the natural abundance of Ag107 is 51.84%, what is the natural abundance of Ag109? % (c) If the mass of Ag107 is 106.905, what is the mass of Ag109? amu I really need help. Can u say the answer then explain how you got it? Thanks:)
asked by Rebekah 
Statistics
If I deal you one card from a standard deck of 52 and it is a face card, I will give you a $5.00 bill. There are 12 face cards. There is one catch: You have to pay me something to play this game. How much would that be if the game is to be fair?
asked by Lori 
Biology Chemistry Part
I'm trying to calculated the rate of reaction In this lab I took a 50 mL beaker and poured in 10 ml of cold distilled water into it, I then poured in 30 ml of original enzyme solution (I believed we used cold potato juice or something), I then took a piece
asked by Kate 
algebra
How do you graph this liear inequality 2y greater than equal to 4x6
asked by Brittney 
Math
how do I solve this problem. In 1920 the record for a certain race was 445.7 sec. In 1970, it was 44.2 sec. Let R(t) = the record in the race and t = the number of years since 1920. a) Find a linear function that fits the data R(t) = b) What is the
asked by lisa 
Physics
At time t = 0, a hockey puck is sent sliding in the +x direction over a frozen lake, directly into a strong wind. Figure 213 gives the velocity v of the puck versus time, as the puck moves along a single axis. (The time axis is marked in increments of 1.0
asked by Lily 
MATH
Grady has designed a wooden storage cabinet for his CD's amd DVd's. The cabinet has wooden door that can be closed. It is in the shape of a rectangular prism. a) calculate volume of rect. prism. So I go l*w*h? b? Grady has decided to keep the length and
asked by Anonymous 
business
Research the Volkswagen Group website. Using your research findings from the Library and the Internet, develop both an EFAS (External Factors Analysis Summary) table and an IFAS (Internal Factors Analysis Summary) table. The tables are to be submitted in
asked by Jackie 
muah
explain why the name of the insect millipede doesnt follow SI conventions? please help me i cant find this any where in my text. I would be very happy if you did help. :D
asked by Chemistry 
accounting
I have answer a hypothetical situation question as to what advice I would give to a business owner whose business in growing on how to make her accounting work more efficient. She manually enters in cash sales daily, makes purchase orders over the phone,
asked by sylvia 
Math algebra honours
In the equation ax  x = c what is x i did it so far but i need help this is what i got so far ax  x + x = 9 + x ax/a = c+x/a x= what that is what i need help on and also y=xv/b please and thank you can you also explain thanks and may you have a
asked by Jacytiopa (i know its weird but my mom picked it) 
physics
A crate weighs 820N and rests on a 34degree incline. You can keep it from sliding down the incline by pushing on it with a force of 240N applied parallel to the incline. 1)Calculate the coefficient of static friction between the crate and the incline.
asked by Anonymous 
business
What does it mean that the PC is concerned commodity?
asked by Anonymous 
Physics
As your plane speeds down the runway during takeoff, you decide to determine the acceleration of the plane. you take your yoyo and note that when you suspend it, the string makes an angle of 22 degrees with the vertical. What is the acceleration of the
asked by Anonymous 
Biology Chemistry Part
I'm trying to calculated the rate of reaction In this lab I took a 50 mL beaker and poured in 10 ml of cold distilled water into it, I then poured in 30 ml of original enzyme solution (I believed we used cold potato juice or something), I then took a piece
asked by Kate 
Physics
Highway safety engineers build soft barriers so that cars hitting them will slow down at a safe rate. A person wearing a seat belt can withstand and acceleration of 3.0 102 m/s2. How thick should barriers be to safely stop a car that hits a barrier at 106
asked by Monica 
Algebra
Could someone help me with this question Simplify the rational expression. (3x^2y+9xy^212y^3)/(36x^3y27x^2y^29xy^3)
asked by Alex 
Math
Evaluate the following when x=3, if possible. (a)x (b)/x/ (c)x^2 (d)(1+x)
asked by Anonymous 
english
Is this sentence correct? To truly help a patient, I should allow them decide their own choice by letting them hear different life stories.
asked by Anonymous 
math
the value, v, of a shopkeepers inventory software program is given by v= (1)/(2)t+3 where t is the number of years since the shopkeeper bought the program. What is the program worth 6 years after its first year purchased? Plot the point with the given
asked by Anonymous 
math
Describe three strategies for estimation.
asked by Anonymous 
adult education
do i use is / are invited? You and a friend or 2 is invited to my Garage Sale.
asked by sue 
statistics
School 1 Statistics: Average truancy per student is 8 days per semester with a standard deviation 2.2 and a population of 250 students. a. What percent of the population is truant more than 9 days? b. What percent of the population is truant less than 3
asked by lashara 
english
How do I make a title Page??? Thanks :)
asked by I NEED HELP NOW!!:) 
Precalc
A cardboard box with an open top and a square bottom is to have a volume of 45 ft3 . Use a table utility to determine the dimensions of the box to the nearest 0.1 foot that will minimize the amount of cardboard used to construct the box.
asked by Julie 
economics
out of the four economic market models : competitive market, monopoly market, monopolistic competition and oligopolywhich is the best market model and which is the worst
asked by chris 
Math Graphing
x^3 < 3x^2 would become x(x^23x) then how would I graph this?
asked by Amy~ 
English
Here are some sentences on Robinson Crusoe I'd like you to check. Thank you. 1) After rowing for seven kilometres, a huge wave took the boat and threw them into the air like a ball. 2) Robinson fell into the sea, water filled his mouth (his mouth was
asked by Franco 
physical science
what is a unit?
asked by Anonymous 
CHEM
what is the charge of a PHOSPITE ? and how do i write it?
asked by OLGA 
College Chemistry
25.0g of aluminum reacts with 55.0grams of chlorine gas to produce aluminum tetrichloride. Which reactant is liminting and how much product is produced? Al + Cl2 > AlCl3
asked by Sam319 
math
Help! i am having trouble finding the order pair for the first pair I have (0,12), but I am not sure this is correct 9x4y= 12 and 4y9x=12
asked by jean 
Organic Chemistry!!!
pure acetylsalicylic acid has a melting point of 135.0  135.5 degreed celsius. what would you expect to happen to the melting point if this was mized as a 50:50 mixture with pure benzoic acid (mp 121  122)
asked by Jennifer 
marketing
______________ is the process of naming broad productmarkets and then segmenting these broad productmarkets in order to select target markets and develop suitable marketing mixes.
asked by Anonymous 
Anatomy
A woman who recently came home from a tropical vacation now has abdominal pain and diarrhea. Her blood test results how an elevated eosinophil level. Which of the following organisms is most likely to cause her illness? A. Bacteria B. Worm C. Virus D.
asked by Nikki 
Factors
look at the following sentences: 2x7 and 7x3 Are these #s all factors of the same product? Explain your answer.
asked by Jr. 
psychology
describe why it is important to consider each domain in the study of adult development
asked by Tasha 
English
Posted by rfvv on Saturday, September 25, 2010 at 9:16am. 1. Yesterday was his 100th day. 2. one hundredth day 3. a hundredth day (How can we read '100th day'?) English  Writeacher, Saturday, September 25, 2010 at 9:41am Do you mean his 100th birthday?
asked by rfvv 
math
Michel’s class had 4 A’s, 10 B’s, 13 C’s, 8 D’s, and 2 F’s. (a) What is the ratio of A’s to B’s? (b) What is the ratio of F’s to total students?
asked by Anonymous 
english
Is this correct? nurses do have feelings as they empathize with the patients’ conditions
asked by Anonymous 
physics
A car is driven 165 km west and then 25 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?
asked by Carol 
algebra
solve 9/10(3x+2x)+2 >_ 23
asked by Anonymous 
physics
write down the value of 3.65x10^6g in kg write down the value of 62microseconds in seconds write down the value og 6.16x10^7mm in m please help me with these!! thanks!
asked by sam 
MATH
Which term(s) describe(s) this system? 4x + y = 8 3x – 2y = –5 dependent consistent and dependent consistent and independent inconsistent
asked by NICK 
Macroeconomics
What are the key elements of the scientific method and how dose this method relate to economic principles and laws?
asked by Alex 
com/155
include a discussion of sentence variety and the rhythm of the author's writing about Individuals can be denied credit for a number of reasons.
asked by jo 
Math homework
 3 3/7ths +  14 3/4ths how would i solve this?
asked by Annalisa 
economics
out of the four economic market models which is the best market model and which is the worst
asked by chris 
algerbra 1
p+15/42=p5/14
asked by miranda 
Calculus
How would you find the limit of (secx1)/(x^2) as x goes to 0 algebraically?
asked by John 
Statistics
Examine the three samples listed here. Without performing any calculations, indicate which sample has the largest amount of variation and which sample has the smallest amount of variation. Explain how you produced your answer. a. 17 29 12 16 11 b. 22 18 23
asked by Rhea 
college english
I have to revise sentences to eliminate illogical or overused coordination. Are the following sentences correct? Thanks! The object of fencing is to be the first to touch the opponent five times, and a "president," who is sometimes assisted by a number of
asked by Jennifer 
math
how do you multiply a mixed number × a fraction!? like 2 4/5 × 1/3 or 2 2/3 ×1/6
asked by my name 
Physics
Two trucks, 300 km apart, are on a headon collision course with one another. The first truck is moving at 100 m/s and the other is moving at 50 m/s in the opposite direction. A confused (but swift) fly starts from the front bumper of the faster truck and
asked by Amie 
Check Statistics
Calculate the first, second, and third quartiles of the following sample. 2 2 3 3 4 4 4 5 5 5 7 7 8 9 10 Are my answers correct: 25th percentile = 3 50th percentile  5 75th percentile = 7
asked by Rhea 
math
d^2y/dx^2=1dy/dx am i allowed to rearrange this to d^2y/dx^2dy/dx=1 and say this is a linear ODE
asked by flame 
English Grammar
EssayWomen Reservation
asked by Gautam 
algebra
solve for x: 2x+3y=8
asked by s 
Science
Make the necessary conversions between ordinary decimal form and standard exponential notation. a) 56934 = ?
asked by Lauren 
algebra
solve for y: 6x + 2y = 14
asked by shaks 
English
Can you help me checked if the following sentences are grammatically correct? Thank you very much. 1) On what condition can Shylock take a pound of flesh from Antonio? On condition that he doesn't drop(?) a single drop of Antonio's blood. 2) Why can have
asked by Franco 
Chemistry, Algebra
A baker uses dried skim milk that contains 3.0% moisture and costs $1.16 per lb, which on a moisture free basis would be $1.20 per lb. If liquid skim milk containing 90.5% water costs $1.60 per gallon (8.64 lbs), what would be the comparative cost of 1lb.
asked by HELP!!! 
math
What are the values of b which satisfy b square root of 11996b=1?
asked by Emili 
Paralegalism
A paralegal quits the firm of Johnson & Johnson. When she leaves, she takes client documents she prepared while at the firm. The documents contain confidential client information. The paralegal is showing these documents to potential employers as writing
asked by TK 
sunshine math
use each of these digits one time: 2, 4, 6, and 8, to produce the answer "14"
asked by emile 
8th grade
what is the unit price of a 12 oz.bag of doritos on sale for 3.oo dollars
asked by rissa 
Science
Does anyone know where to find facts about iced tea powder? ex. who made it, where did it come from, anything!
asked by Anya 
Math
Write each of the fractions in their decimal form and then arrange them from the smallest to the biggest. 2/3 3/5 31/50 67/100
asked by Kathleen 
Math algebra honours
Can someone please answer my question it is the other one named algbra honurs i am kinda new to this website so i don't know if you postt it twice or not can someone please help thankyou
asked by Jacytiopa (i know its weird but my mom picked it 
math probelm need serious help!!!
4x(93x)= 8x1
asked by hello world!!!! 
Physics
The velocity vefot of a ball is v(t)=3x+4y at any time. Its initial position is r=12x4y. The components of the velocity vector are in m/s and the components of the position vector are in meters. The symbols x and y are the unit vetors in x and y
asked by Sarah 
Art
Why is important for children to draw pictures of things that scare them (otherwise what does the child learn from this?
asked by Madison 
chemistry
how many moles of oxygen (molecule) are required for complete reaction with 2.1080 moles of iron?
asked by Anonymous 
History
what role did the geography of europe play in the development of and ways of life in these towns?
asked by Hi 
History
Describe the daily lives of medieval, europeans, including their homes, occupations, education, and leisure activities
asked by Hi 
Read and Write
does anyone know a website where i could find human characteristics of columbus indiana?
asked by hunter 
foundation of science
what parts of the ladder corrsponds to the energy level of the atom?
asked by tori 
Chemistry/physics
Calculate the final temp. of 100g of Ag at 40 C is immersed in 60.0g of water at 10.0 C. SH of Ag is 0.065 cal/g/C SH of H2O is 4.184 J/g/C I can't figure out how to put delta T in the equation when I haven't found it yet :\
asked by Natalie 
math
the value, v, of a shopkeepers inventory software program is given by v= (1)/(3)t+5 where t is the number of years since the shopkeeper bought the program. What is the program worth 9 years after its first year purchased? Plot the point with the given
asked by Anonymous 
HIS 115
I am reviewing the Gutierrez Map and I need to know, what does this mean: How might the map’s indication of where Native American’s lived have strengthened European claims of sovereignty? Could you please reword this question so I can understand what
asked by Suzanne 
com 155
Write a 100word passage to Susan Anker, the author of the course’s textbook, in which you describe five details from her book that are good and five details about the book that are written well.
asked by bb 
math factoring
Factor each of the following expressions: (a)5x3x^2 (b)25x^2
asked by Anonymous 
chemistry
If silver chloride is not dry when its mass is determined, will the calculated percent of silver in the alloy be too high or too low?
asked by Anonymous 
english
what are direct and inderect objects?
asked by sarah 
math
Average truancy per student is 8 days per semester with a standard deviation 2.2 and a population of 250 students. a. What percent of the population is truant more than 9 days? b. What percent of the population is truant less than 3 days? c. What percent
asked by lashara 
Science
what is the mixture that is formed when one subtance dissolves in another called?
asked by Erika 
drawing
canu show me how to do scribble hatchimg
asked by Anonymous 
College Physics
a horizontal speed of 15.8 m/s and a vertical speed 10.0 m/s upward. What is the vertical speed 1.12 s later?
asked by J 
algebra
how to clearing decimals multiplying by 10
asked by frances 
Physics
At time t = 0, a hockey puck is sent sliding in the +x direction over a frozen lake, directly into a strong wind. Figure 213 gives the velocity v of the puck versus time, as the puck moves along a single axis. (The time axis is marked in increments of 1.0
asked by Lily 
Math Surveying
Hey, Need some help working these 3 problems. I have the answers but I'm having problems working them. Thank you in advance. The slope measurement between two points is 25.333 m and the slope angle is 1°50. Compute the horizontal distance. A distance of
asked by Mason 
math
f=5gh for h
asked by Sissy 
math
vehicle a averges 14 miles per gallon of gasoline and vehicle b averges 36 miles per gallon of gasoline at these rates how many more gallons of gasoline does vehicle a need then vehicle b to make a 1008mile trip
asked by Anonymous 
ela
Below the main level, we have a large playroom. What part of speech is below?
asked by caitlin 
Geometry
I have this much so far (1+x)/9 = 2/5 or x = 13/5 = 2.6 ft I am unsure of how to work out the rest of the problem. A wooden board is placed so that it leans against a loading dock to provide a ramp. The board is supported by a metal beam perpendicular to
asked by Anna 
adult education
Learning activities currently used exploring the web resources read widely accept feedback Leaning activities that needs improvement reshape ideas follow intution
asked by betty 
science
What is the chemical name for Polyurethane and what does it look like at it's resting state?
asked by Jack 
physics
3 miles to centimeters will someone help with that problem? and tell me how to show my work with all the multiplication and division. like 1 mile over 3 centimeters or whatever (random numbers) but will you show me how and what the answer is please
asked by conversions 
statistics
13) You are told that the mean height of trees around the Physics building is 8 feet tall, with a standard deviation of 1.5 feet. Which is the most appropriate statement you can make, based on this information?
asked by matt 
stats
Some IQ tests are standardized to a Normal model with a mean of 100 and a standard deviation of 16. About what percent of people should have IQ scores above 116?
asked by Jamie 
Accounting
The partners in New Yorker Company decide to liquidate the firm when the balance sheet shows the following.
asked by Laetitia 
Math
I am thinking of a threedigit number. If you subtract 5 from it, the result is divisible by 5. If you subtract 6 from it, the result is divisible by 6 and if you subtract 7 from it, the result is divisible by 7. What is the smallest number that will
asked by Anthony 
chemistry
How many grams of Al will react with 3.00 mol of 0(2)?
asked by Alisha 
Biochemistry
My professor was saying something about cycling, how it compacts the structure, and how it relates to solubility somehow. He used the example of cyclohexane vs. hexane, but I didn't catch what he said. And then he mentioned proline, which is a cyclic amino
asked by John 
college chemistry
How would you prepare a 250 mL solution of 0.45 M from a stock solution of 5.5 M?
asked by Latroy33 
5th grade
On this day in 1789, the Supreme Court was established. Using resources in the classroom, learn five (5) facts about the Supreme Court’s roll in our nation’s government and summarize them in your own words. Can someone help me with this it's for my
asked by Johana 
algebra
15000(1+0.07/2)^2*4
asked by keith 
trig
The angle of elevation from the top of a house to a jet flying 2 miles above the house is x radians. If d represents the horizontal distance, in miles, of the jet from the house, express d in terms of a trigonmetric function of x.
asked by bj 
college health care quality mangement
Please explain three things you have learned about quality and performance . What impact have these three things had on the evolution of health care quality programs? Please substantiate your answers with examples.
asked by monica 
Social Studies
What about the resources? Thank u
asked by Johana 
algerbra 1
2/n=14/n+30 can some one help me?
asked by Anonymous 
chemistry
using only words and no numbers how would i explain the steps necesarry to show how many kilograms are in a milligram? thanks :D
asked by ammmyyy 
1th phyics
A car traveling at 7.5 m/s accelerates 3.4m/s2 to reach a speed of 15.0 m/s. How long does it take for this acceleration to occur?
asked by Taylor 
math
1AND PRODUCTION sum of roots of the equation :X²X6=0 2FOR what values of A the equation has no solution ax ² +3 x7 = 0 3For what values of x the equation has 2 solution X²X+C=0 4Solve the equation (X1)²4=0 5Solve the equation a)2/2
asked by Anonymous 
math
Is this right? smallest to biggest 0.62 31/50 0.67 2/3 0.67 67/100 0.6 3/5
asked by Kathleen 
English
Here are some more sentences on Defoe's Robinson Crusoe I'd like you to check. Thank you very much in advance. 1) As he hadn’t eaten anything since the day before, he decided to take off his clothes and swim to the ship to look for food. He tried to get
asked by Franco 
English
1. Write a report on your favorite artist. 2. Write a report about your favorite artist. (Are both the same? What is the difference between 'on' and 'about'?)
asked by rfvv 
Enviromental Science
How many cal and K cal are required to evaporate one gram of water at 100 degrees Celcius?
asked by Cindy 
math
The relationship described below can be modeled using an equation. Identify the variables and write an equation to solve the questions below. Number of subscriptions sold/ pay per wk 5 150 10 200 15 250 20 300 25 350 Sheryl has a parttime job working for
asked by Anonymous 
chemistry
explain what is meant by the scientific method
asked by shawnda 
Biconditional statements
™PQR and ™QRS are supplementary if and only if m™PQR = m™QRS = 90°. true or false if false provide a couterexample
asked by oconel 
chimistry
what distinguishes one element from another?
asked by ducky 
world history
what were some racial ideologies from 15001830
asked by Anonymous 
accounting
state 5 assumptions underlying cost volume profit(breakeven )analysis
asked by shaz 
Statistics
n=1000, bellshaped Mean  5,000 ~950 lie +/100 of 5000 4900 to 5100 Required 1) Standard Deviation 2) 97.5th percentile value 3) Zscore for 16th percentile
asked by Rhea 
English
As promised, I just included the first five sentences I wasn't sure of. 1) One day he got to the beach and saw it was covered with human bones. He realized that cannibals had eaten men on his island. He believed that cannibals ate other men because they
asked by Franco 
ap history
one reason for the development of indenture employed in the early colonial period was
asked by lu 
World History
How did civilized culture survive the rise and fall of regional states?
asked by Christina 
Chemistry
How is the average mass of a penny related to average atomic mass?
asked by Gigi 
Science
What is the term that means "not able to be dissolved in a particular substance?"
asked by Erika 
algerbra 1
Antartica comprises about 10.5% of the total land area on earth. antartica has a surface area of about 5,400,000 square miles. what is the total land area on earth? write an equation and slove.
asked by miranda 
college english
I have to revise sentences to eliminate illogical or overused coordination. Is the following sentence correct? Thanks! Fencing equipment includes a mask, a padded jacket, and a glove, and one of three weaponsa foil,epee, or saberand a fencer's technique
asked by Jennifer 
american literature
do you know anything about the crucible. i need help with this proect asap.
asked by lizzie 
statistics
Find z such that 20.3% of the standard normal curve lies to the right of z. 0.831 0.533 0.533 0.257 0.257
asked by Randy 
history
how were the differences important to the international state of affairs in 1450?
asked by chris 
Marketing
Describe how companies have used marketing data to target wants and need.
asked by Laurie 
Statistics
A friend calculates a variance and reports that it is 25.0. How do you know that he has made a serious calculation error?
asked by Rhea 
Random?
When students do a drawing in class, why is it important for them to share their piece of work with the rest of the class? (why is this good for the student)
asked by Hailey 
comp
compare a smart UPS to one that does not interface with a PC but otherwise has similar ratings
asked by von 
textile technology
What are the safety rules in textile technology?
asked by adwoa eman 
adult educaction
I'm sorry for the inconvenience but im all new to this school stuff but i need help with giving an examples of those two discussions guestions.
asked by betty 
Repost ms. sue.
how were the first civilizations similar and different? They all had a social hierarchy, and some sort of government. The main type of ecominic income was agriculturei think. That's all I know
asked by Christina 
physics
what is your age in seconds? this is a conversion problem. someone help please with all the multiplication and division... very confused. THANK YOU
asked by conversions 
muah
using only words and no numbers how would i explain the steps necesarry to show how many kilograms are in a milligram? thanks :D
asked by Chemistry 
12th grade
bikes tyre filled with air pressure=6 atm =6x10^5 Pa on tempreture 20c = 20+273 = 293 K.. we used the bike on tempreture at 45 c the volume increase by 2%. find the new volume?PV=nRT
asked by joe 
physics
if four of length on a real home is represented by one inch on a scale model of the home, what legth on the scale model would represent one foot on the real home?
asked by krissy 
accounting
general ledger entry: sold $700 of merchandise (that had cost $220) on credit to Sam's Company.
asked by ann 
management
common leadership problem that leads to failed vision is an inability to detect important changes in markets
asked by Jorie 
algebra
pricipal is30,000 rate of interest is three and five eigth time thirty years find amount in account .show me step by step how to solve
asked by Teresa 
math
How do you tell whether a table (x,y) represents a linear relationship
asked by Dessler 
Social Studies
Where can I find letters from Amerigo Vespucci on his 1 st voyage but not in old english.??? ASAP!!!
asked by Sumaiya 
Math
The total area of three flowerbeds is 8 13/20m². Calculate how much of the garden remains if the whole garden covers 10 squared meters. Please show the working!
asked by Kathleen 
eighth grade english parts of speech
what part of speech is the word in
asked by shakiria marsh 
• Use at least five adverbs and five adjectives to
Lottery ticket movie review. Winning the lottery what would you do with $370million dollar lottery ticket? In this movie Bow wow that plays the role as Kevin a nice young man working to help support his grandmother keeps to himself when he runs into some
asked by meg 
Geography
Where can I find a map of the North and South Poles when it is always night time for half a year?
asked by AL 92 
psych
what does it mean to be empirical in the pursuit of knowledge? how dies this relate to the scientific method?
asked by diana 
poer point
To enhance the movement of graphic objects and bulleted text lists in your slideshow, you should use A. layouts. C. transitions. B. animation. D. wizards
asked by saint 
Math
What is the domain of (sec(x)1)/(x^2)?
asked by John 
chemistry
A benzene solution of a nonvolatile solute exhibits a vapor pressure of 90.5 torr at 25 degree C. The vapor pressure of benzene at 25 degree C is 93.9 torr.. what is the mole fraction of the solute in this solution?
asked by Amanda 
9th grade
1/9=a/a+24 I don't get this plez someone HELP
asked by miranda 
math
The total area of three flowerbeds is 8 13/20m². Calculate how much of the garden remains if the whole garden covers 10 squared meters. Please show the working.
asked by Kathleen 
Chemistry
What is the corresponding EM wave for: a) 274nm b) 71nm?
asked by John 
Math
Can somebody explain to me how the table of value works for Polynomial Functions? :S
asked by Bobby 
excell
Which one of the following operations will move you from cell B7 to cell B8 of a worksheet? A. Pressing the right arrow key B. Clicking on the down scroll arrow C. Pressing the Enter key D. Pressing the Page Down key
asked by saint 
Math
1.The square of x is equal to 4 times the square od y. If x is 1 more than twice y, what is the value of x? A) 4 B) .5 C) .25 D) .25 E) .5 2.In the xycoordinate plane, lines L an Q are perpendicular. If line L contains the points (0,0) and (2,1), and
asked by Leslie 
Algebra 2
How do you factor u^2  v^2 + 2v + 1?
asked by Anna 
Read Write
Does anyone know how Columbus Indiana interact with the enivroment?
asked by hunter 
Chemistry
Why does molarity depend on temperature?
asked by Jacob 
Math
1.73 x 10^6
asked by Anonymous 
AP U.S. history
what additional safeguards were proposed by thomas jefferson and james madison in the virgina and kentucky resolutions, and what werethe implications of these resolutions with regard to the growth of the centeral government?
asked by jordan 
english
The face of this admired accomplished American papers on postage stamps coins and paper money of the United States. Can you please help me with correct comma placement?
asked by dana 
English
I forgot to include the following sentences which belong to the same summary. Thank you for you help. 1) One day he got to the beach and saw it was covered with human bones. He realized that cannibals had eaten men on his island. He believed that cannibals
asked by Franco 
Chem
(b) If the natural abundance of Ag107 is 51.84%, what is the natural abundance of Ag109? Thanks
asked by Rebekah 
Math
3.5(4a+1.9)
asked by Jazlyn 
math
i need to know 1,000 x 340
asked by karly 
English
Why is silent reading good for children during class?
asked by Courtney