Sunday

March 29, 2015

March 29, 2015

Total # Posts: 2,923

**chemistry**

An aqueous solution of nacl has a mole fraction of 0.21. What is the mass of NaCl dissolved in 100.0 mL of solution?
*February 13, 2011*

**Chemistry**

An unknown element Q has two known isotopes: 60Q and 63Q. If the average atomic mass is 60.5 amu, what are the relative percentages of the isotopes?
*February 13, 2011*

**Chemistry**

An unknown element Q has two known isotopes: 60Q and 63Q. If the average atomic mass is 60.5 amu, what are the relative percentages of the isotopes?
*February 13, 2011*

**chemistry**

the shape and nonding in a Br2 molecule is best described as
*February 9, 2011*

**chemistry**

if you mix 50ml of 0.1 tris acid with 60ml if 0.2m tris base, what will be the resulting pH?
*February 9, 2011*

**chemistry**

If the solubility of a particular solute is (10 g/100 g H2O) at 20°C, what solution concentration would represent a supersaturated aqueous solution of that solute?
*February 8, 2011*

**accounting**

Connection Station, an internet café, had the following operating activities during the month of May: 1. Bought 800 in jump drives and disks, which are available for resale from Office Depot on credit 2. Paid 900 in utilities for the month of may 3. Paid 2000 rent for ...
*February 6, 2011*

**Socials Studies**

The puritans had a long-lasting effect on English society and, to some extent, our own. What would be some aspects of society today that seem "puritan" in origin? I really need help on this.. Please, and thank you :-)
*February 3, 2011*

**intro to chemistry**

how to come come up with a significant digits poam
*February 3, 2011*

**chemistry**

how do i come up with POEM about significant digits please help
*February 3, 2011*

**Physics**

4.407
*February 3, 2011*

**physics**

A football is kicked with an initial speed of 18 m/s at an angle of 36 degrees above the horizontal. (a) What is the maximum height that it reaches? (b) At what time does it land? (c) How far horizontally does it travel?
*February 3, 2011*

**physics**

A 59.0-Ω resistor is connected in parallel with a 116.0-Ω resistor. This parallel group is connected in series with a 15.0-Ω resistor. The total combination is connected across a 15.0-V battery. (a) Find the current in the 116.0-Ω resistor. ______A (b) Find...
*February 1, 2011*

**childcare**

ALL WRONG EXCEPT FOR A FEW !!!! WTF ITS CALLED HOMEWORK HELP FOR A REASON
*February 1, 2011*

**algebra**

1-2x-5=4x+2
*January 31, 2011*

**chemistry**

1. If a gaseous sample contains 73% N2 by volume, what is the solubility of N2 in water at 25°C and 1.0 atm (kH in H2O at 25°C = 7.0 10-4 mol/Latm)? 2. Calculate the vapor pressure of a solution of 0.60 mol of cholesterol in 4.5 mol of toluene at 32°C. Pure toluene...
*January 31, 2011*

**Physics**

how do i solve for time when i don't know initial velocity?
*January 30, 2011*

**Physics**

A ball is thrown horizontally from the top of a building 55.4 m high. The ball strikes the ground at a point 65 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion in seconds.
*January 30, 2011*

**Physical science**

A ball thrown upward reaches a height of 13m. How much time did it take to get to this height? How much time will take to fall to the ground?
*January 27, 2011*

**physics**

A car moving at 10m/s when it begins to be accelerated at 2.5m/s^2. (a)How long does the car take to reach a speed of 25m/s? (b) How far does it go during this period
*January 27, 2011*

**Chemistry**

A 0.75 L bottle is cleaned, dried, and closed in a room where the air is 20°C and 42% relative humidity (that is, the water vapor in the air is 0.42 of the equilibrium vapor pressure at 20°C). The bottle is brought outside and stored at 0.0°C. (See Table 5.2) (a) ...
*January 26, 2011*

**AP Chemistry **

The answer is 50.0 torr and I got 46.0 torr but idk what I did wrong. Find the vapor pressure of a solution of 164 g of C3H8O3 and 338 mL of water at 39.8 degrees Celsius. Water's VP at 39.8 degrees celsius is 54.74 torr; it's density is 0.992 g/mL.
*January 25, 2011*

**chemistry**

how do you find the rate of production when you already know the rate of consumption? kinetics questions
*January 25, 2011*

**English**

Can you tellion. me what to put in this sentence? (comma, semicolons, hyphens, colons) 1. Thank you Dr. Smith for seeing this patient in pulmonary consulat
*January 24, 2011*

**physics**

A steel ball is dropped from a diving platform (with an initial velocity of zero). Use the approximate value of g = 10 m/s2. (a) Through what distance does the ball fall in the first 1.5 seconds of its flight? (b) How far does it fall in the first 4 seconds of its flight?
*January 20, 2011*

**math **

after school chase spends 20 min reading 30 min practicing the piano 15 min cleaning his room, and 40 min doing his homework, chase is busy for 105 min what fraction of the time does he spend cleaning his room?
*January 20, 2011*

**MATH**

determine the sum of: 50 over Σ 8(.5)^n-2 n=1
*January 20, 2011*

**financial planning**

Identify two cash management products and provide a short description of each. Do you have any experience with these products?
*January 19, 2011*

**math**

how do you do expanded algorithm? here's an example to use for the answer 58*26
*January 18, 2011*

**Math**

f(x) = 10x - 5 What is the value of f^-1(-4)?
*January 18, 2011*

**Math**

Mary drove from Amity to Belleville at a speed of 50 mph. On the way back, she drove at 60 mph. The total trip took 4 2/5 hours of driving time. Find the distance between these two cities. Any help would be greatly appreciated! =]
*January 17, 2011*

**math**

i'm sorry the second equals sign should be a + sign
*January 17, 2011*

**math**

-3(4b-10) = .5(-24b=60) find the value of b
*January 17, 2011*

** math**

here are the steps use distributive property to: 3 x g - 3x3 = 6 simplify to: 3g - 9 = 6 9+6 = 15 15 divided by 3 = 5 so, g = 5
*January 17, 2011*

**Physics**

Time intervals measured with a stopwatch typically have an uncertainty of about 0.2 s, due to human reaction time at the start and stop moments. What is the percent uncertainty of a handtimed measurement of (a) 5 s, (b) 50 s, (c) 5 min?
*January 17, 2011*

**computer science**

what language are you using def main(): for i in range(3) number = eval(input('Enter a number?')) pirnt(number)
*January 17, 2011*

**statistics**

1. Suppose the number of students in line during office hours: # of Students (X) Probability P(X) 0 0.40 1 0.30 2 ???? 3 0.10 a. If you knew that the number of students in line was between 0 and 3, what is the probability that will be 2 students in line when you arrive at the ...
*January 13, 2011*

**Psychology**

Thank you very much. This has been very helpful.
*January 13, 2011*

**Psychology**

• Post a 200- to 300-word response to the following: Describe the stages of sleep. In which stage do we dream? What are the five common beliefs about dreaming? What are the two common theories about dreams? Which of the two theories do you agree with? Explain. I am having...
*January 13, 2011*

**stats help!**

thank you in advance! in a given year the college admissions office accepts applicants from students, who are then either accepted or not accepted. accepted students may or may not decide to attend college. suppose the scores on a certain entrance exam for applicants of murphy...
*January 12, 2011*

**dressmaking**

thank you !!! im doin pennfoster an u helped me out alot :)
*January 12, 2011*

**math**

554
*January 11, 2011*

**algebra 1b**

A customer wants to make a teepee in his backyard for his children. He plans to use lengths of PVC plumbing pipe for the supports on the teepee, and he wants the teepee to be 12 feet across and 8 feet tall (see figure). How long should the pieces of PVC plumbing pipe be?
*January 11, 2011*

**chem**

how many grams of hydrogen chloride is needed to produce 200 grams of hydrogen
*January 11, 2011*

**Math**

Find the volume of a rectangular pet carrier whose dimensions are 18.20 in wide, 14.00 in long, and 18.80 in high. Report the answer to the nearest hundredth of a cubic inch.
*January 11, 2011*

**geometry**

If BC = 2x + 1, CD = 3x - 4 and BD = 22, find the value of x.
*January 10, 2011*

**8th Grade Chemestry**

You are sledding on a snow-covered hill at a speed of 6 m/s. There is a drop that increases your speed to 12 m/s in 4 s. Find your acceleration.
*January 9, 2011*

**science **

what cause breast cancer?
*January 7, 2011*

**math**

r = 2/3t + v, for t
*January 6, 2011*

**Physics**

A block weighing 9.7 N requires a force of 2.6 N to push it along at constant velocity. What is the coefficient of friction for the surface?
*January 5, 2011*

**math **

patty has 123 cds in her music collection. of her cds 27 are country music. estimate the percent of patty's cds that are country music cds
*January 5, 2011*

**math **

patty has 123 cds in her music collection. of her cds 27 are country music. estimate the precent of patty's cds that are country music cds
*January 5, 2011*

**Chemistry**

If 3.0 moles of HCl are consumed in the reaction below, how many moles of FeCl3 are produced? 6HCl + Fe2O3 --> 2FeCl3 + 3H2O
*January 4, 2011*

**Chemistry**

In the equation: Fe(NO3)3 (aq) + 3KSCN (aq) forms FeSCN3 (aq) + 3KNO3 (aq) What type of reaction is this? why are there two aqueous solutions as products? Is there a secondary reaction? Finally is there a name for these products?
*January 4, 2011*

**science**

In the equation: Fe(NO©ý)©ý (aq) + 3KSCN (aq) ¡æFeSCN©ý (aq) + 3KNO©ý (aq) Why do two aqueous solutions form? What is this calle? Is there a seconday reaction?
*January 4, 2011*

**Science 6th grade**

I know definitely that it is 3
*December 30, 2010*

**Physics**

A 200kg motorcycle is driving in a circular path at 1 rev per 5 seconds and the circle has r=12m
*December 20, 2010*

**chemistry**

Both H2O and CO2 have 3 atoms, yet one is polar and one is nonpolar. Explain why, using Lewis dot structures in your answer
*December 19, 2010*

**calculus**

Find the volume of the solid whose base of a solid is the region bounded bythegraphsofy=3x,y=6,andx=0. Thecross␣sections perpendicular to the x ␣ axis are rectangles of perimeter 20.
*December 16, 2010*

**calculus**

Find the volume of the solid whose base of a solid is the region bounded bythegraphsofy=3x,y=6,andx=0. Thecross␣sections perpendicular to the x ␣ axis are rectangles of perimeter 20.
*December 16, 2010*

**Chemistry (URGENT)**

A gas mixture with a total pressure of 770 contains each of the following gases at the indicated partial pressures: CO2 , 249mmHg ; , Ar 114mmHg ; and , O2 174mmHg . The mixture also contains helium gas. 1. What is the partial pressure of the helium gas? 2. What mass of helium...
*December 15, 2010*

**Chemistry**

Green Light has a frequency of about 6.00 * 10^14 s^-1. What is the energy of the green light?
*December 15, 2010*

**geometry**

What is the distance from the origin to the point (14,11)?
*December 15, 2010*

**Toms River**

If you have 23 kids in a class how many of them are 5ft 2ins or taller? And how many are shorter?
*December 15, 2010*

**Geometry**

A train travels uphill at a 12 degree angle. The train rises 150 from the bottom to the top of the hilL. about how long is the track?
*December 14, 2010*

**Substitution method**

x=2y y=2x+3 ??
*December 14, 2010*

**chemistry**

a 52.0 gram sample or water increases in temperature due to the addition of a hot metal from 17.7 degrees C to 24.4 degrees C. How many calories has the water absorbed? how many calories did the metal lose?
*December 13, 2010*

**6th grade**

analogie:After is to before as epilogue is to
*December 12, 2010*

**bio 101**

how the organism in the diagram has evolved physiologically to become suited to its environmen
*December 11, 2010*

**college**

The angle of elevation from point A to the top of a vertical pole is 30.0 degrees. At point B, 6 meters closer to the base of the pole and on a line through the base of the pole and point A, the angle of elevation to the top of the pole is 37.0 degrees. Find the height ( to ...
*December 11, 2010*

**college**

Solve 9 tan x +5 =0, where 0 <= x <= 360
*December 10, 2010*

**Math**

10+4=14 20-1=19 19*14=266
*December 9, 2010*

**Physics**

What is the momentum of a two-particle sys- tem composed of a 1300 kg car moving east at 60 m/s and a second 1500 kg car moving west at 95 m/s? Let east be the positive direction. Answer in units of kg · m/s.
*December 9, 2010*

**MATH**

HOW DO YOU DO INPUT & OUTPUT DIVISION Tables
*December 9, 2010*

**Finance**

A company requires the amount of $1,000,000 in 25 years to retire a bond issue. Assume they can earn 5 3/4% interest compounded daily. What amount would they have to pay quarterly to be able to retire this debt in 25 years?
*December 9, 2010*

**physics**

suppose that a horizontal force of 0.7 n is required to pull a 5.0 kg block across the table at constant speed. what is the initial speed of a 20 g bullet, fired horizontally into the block, if the bullet imbeds in the initially stationary block and causes the block to slide 1...
*December 7, 2010*

**College Chemistry**

Given 400.0 g of hot tea at 80.0C, what mass of ice at 0C must bea added to obtain iced tea at 10.0C? The specific heat of water is 4.18 J/(g*C), The specific heat of water is 4.184 kJ/mol.
*December 6, 2010*

**Chemistry**

At the melting point of benzene, the DH of fusion is 9.95 kJ/mol and the DS of fusion is 35.7 J/K.mol. What is the temperature at which benzene melts?
*December 6, 2010*

**PHYSICS: Waves in Media**

An organ pipe is open at one end and has a length of 3 m. What is its fundamental frequency if the speed of sound is 336 m/s?
*December 6, 2010*

**10th grade**

a 5.0 kg bowling ball is rolling down the lane at 4.0 m/s. what is the kinetic energy of the bowling ball?
*December 6, 2010*

**college**

An essay on- To what extent was president andrew jackson one of the nation'smost effective president?
*December 4, 2010*

**Chemistry**

Caluclate the delta H for this reaction using standard enthalpies of formation. (The standard enthalpy of formation of liquid pentane is -146.8kJ/mol. Balanced equation balanced equation: C5H12(l)+8O2(g)-->5CO2+6H2O(g) CO2=393.5 H2O=40.7
*December 4, 2010*

**physics**

At 10:15 am snail 1 crossed the 65 cm mark with a velocity of 4cm/min. In a great burst of energy, Snail 1 raced to the 90 cm mark in 3 minutes. His velocity as he crossed the 90 cm mark was 7cm/min. What was the acceleration of Snail 1?
*December 4, 2010*

**Chemistry**

A large sport utility vehicle has a mass of 2500kg. Calculate the mass of CO2 emitted into the atmosphere upon accelerating the SUVfrom 0.0mph to 66.0 mph. Assume that the required energy comes from the combustion of octane with 30% efficiency. (Hint: Use KE= 1/2mv^2 to ...
*December 3, 2010*

**Biology**

Please help !!!! two bacteria, "Claire" and "Bob" are infected with a virus. Claire explodes several hours later and Bob lives happily ever after.... until one day when Bob feels stressed out and all the sudden, explodes as well. What happened to bacteria &...
*December 2, 2010*

**Math**

Use the echelon method to solve the following system: x/5+3y=31 2x-y/5=8
*December 2, 2010*

**Math**

Write an expression that represents each question What is 2/3 of 3/8? How many 3/8 are in 2/3?
*December 1, 2010*

**Math**

True?
*December 1, 2010*

**Math**

Is 3/4 between 7/12 and 18/24 on the number line?
*December 1, 2010*

**Science**

The pigment melanin in the skin functions to a. Produce new living cells in the epidermis b.help protect the skin fron sunburn c. Keep water within the skin
*December 1, 2010*

**Science**

When the body becomes too warm blood vessels in the skin become _____?
*December 1, 2010*

**7th grade**

find the next three numbers in the pattern 2/3, 1 5/12, 2 1/6, 2 11/12 _, _, _
*December 1, 2010*

**math**

if 720 can be written as the product of five consecutive integers, determine the middle integer.
*December 1, 2010*

**calculus**

if the area of a triangle with the base 2F and height F-2 is equal to F, compute F.
*December 1, 2010*

**chemistry**

determin the formal charge on each atom in the following molecules and ions. (a)OSCL2 (b)FSO3
*December 1, 2010*

**math**

what is the area and perimeter of 1.7*4
*November 30, 2010*

**algebra**

find the range of the given domain {-1,0,1} f(x)= 3x^2-2x+2
*November 28, 2010*

**college algebra**

g(x)= {x+6, x is less or equal to -4 {1/2x -4, x> -4
*November 24, 2010*

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