Questions Asked on
December 13, 2007

Chemistry
What volume of O2 is required to react with excess CS2 to produce 4.0L of CO2 Assume all gases at STP. Not sure what I am doing wrong, but the answer I am getting is not one of the answers. 4L/X mole=22.4 L/1 mole ===>.1786 mols Balanced equation: O2 + CS2
asked by T 
Calculus
Let R be the region in the first quadrant under the graph of y=1/sqrt(x) for 4
asked by Anonymous 
math
1)Find a1 in a geometric series for which Sn=300,r=3,and n=4 A)15 B)15/2 C)15 D)1/15 I chose A 5)Find the fifth term of the sequence in which a1=3,and aN+1=3aNn A)301 B)99 C)193 D)341 I don't know
asked by Jon 
Chemistry (materials)
I have 3 questions: 1) how might the actual structure of a diamond help explain why it is sometimes found in the form of large, single crystals? 2) what feature of graphite's structure might account for its usefulness as a lubricant? 3) why are fullerenes
asked by Michelle 
chemistry  quant.
I need help calculating the pH of a solution that is .0400M Na3AsO4 I was trying to calculate the pH with [H30+]=sqrt(ka1*ka2) What is the correct way to calculate this? Thankyou
asked by anon 
Astronomy
If a comet has a perihelion distance of 1.AU and an orbital period of 125 Earth years.. What is the comet's aphelion? Cannot seem to find the correct calculation
asked by Liz 
Chem
The melting point of KCl is 776 C whereas the melting point of NaCl is 801 C. 1. Identify the type of bonding in each substance. A: Both NaCl and KCl are ionic. 2. Account for the differences in the boiling points of the substances using principles of
asked by Needs assistance 
maths
how do you write 2.089 in expanded form
asked by christina 
science lab
I did this lab experiment below and I am stumped this question:given the current warming trend of our planet, over time (generations of parents and offspring) what do you predict will happen to the species of wooly worms? THE WOOLY WORM HUNT is an exciting
asked by Maggie R 
chemistry
How do you find the halflife of an element? Please explain and show me how to do this. I know the answer is 14.3 days, but I don't know how to work it. thank you! the problem is: After 42 days, a 2.0g sample of phosphous32 contains only 0.25g of
asked by Ryan 
math
If there are 1200 calories in one pound of ground beef, how many calories are in 3 oz of ground beef?
asked by concetta 
Law and Ethics
I have to create a power point presentation comparing and contrasting the roles that ethics and laws play within health and human servies organizations. Do youm know any good websites that I can use as a reference to complete my presentation?
asked by Jess 
URGENT HELP: calculus  limits at inifinity
1.The efficiency of an internal combustion engine is: efficiency (%) = 100 [1  (1/(x/y)^c)] where x/y is the ratio of the uncompressed gas to the compressed gas and C is a positive constant dependent on the engine design. Find the LIMIT of the efficiency
asked by Anonymous 
math
1)Find the third iterate x3 of f(x)=x24 for an initial value of x0=2 A)4 B)4 C)12 D)12 I chose C 2)Use Pascal's triangle to expand:(wx)5 This ones long so I chose w55w4x+10w3x310w2x4+5wx4x5 3)Use the binomial Theorem to find the third term in the
asked by Jon 
Math
A carnival game consists of rolling a single fair die, with the following results: you win $8 for a 6, $7 for a 5, and lose $3 for any other number. Set a probability distribution, and calculate (already did) the Expected value = .50 Variance= 24.58
asked by Anastasia 
Math  Logarithmic
Solve: 2^(5x6) = 7 My work: log^(5x6) = log7 5x  6(log2) = log7 5x = log7 + 6(log2) x = (log7 + log2^6) / 5 And textbook answer: (log7) / (log2) What did I do wrong?
asked by Anonymous 
Astronomy
A planet is growing by accretion of material from the solar nebula. Suppose that as it grows, its density remains constant. Does the force of gravity at its surface increase, decrease, or stay the same? Why? Also, What would happen to the surface gravity
asked by Liz 
Astronomy help
If a comet has a perihelion distance of 1.AU and an orbital period of 125 Earth years.. What is the comet's aphelion? Cannot seem to find the correct calculation
asked by Liz 
world history
Give me suggestions on the Change over Time Essay, or Changes and Continuities Essay. I am more interested on the content and whether or not I covered the requirements. Below the essay is a rubric. Provide me tips on what to improve, expand, etc. Feel free
asked by mimi 
Algebra
2(x3)3(x+5)=3(x2)7
asked by Amanda 
science
write a balanced equation  we have to do about 20 would be grateful if someone could show me first 2 1. silver + chlorine (arrow towards sc) silver chloride 2. hydrogen + chlorine (arrow towards) hydrogen chloride
asked by sam 
science
THE WOOLY WORM HUNT is an exciting "game" where the students are the Predators, hunting the great (and desirable) wooly worm. The class is given 60 seconds to pick up as many colored wooly worms as possible from the 1400 worms scattered across the Prep's
asked by Anonymous 
Algebra
There are 850 Douglas fir and ponderosa pine trees The company paid an average of $300 for each ponderosa pine. If the company paid $217, 500 for the trees, how many of each kind did the company buy?
asked by Amanda 
math
A classroom table is 1 meter wide and 1.75 meters long. How many 39 centimeter chairs can fit around the table?
asked by hailey 
Algebra Word Problem
A rectangle has dimensions of 12x8inches. If a uniform border is added, then the new rectangle has twice the area of the old rectangle. a) Find the width of the border b) find the new dimensions of the rectangle
asked by Ray 
Physics
Which colored light bulb, red, orange, yellow, green, or blue, emits photons with the least energy? Explain. (b) Which emits photons with the greatest energy? Explain
asked by Mary 
Math
The decimal form 1.46 becomes ______ expressed as a percent. 1 .146% 2 1.46% 3 14.6% 4 146% 1.46 x 100 = 146% is this correct?
asked by Kate 
science
What is the majority compound in cells? What is the majority element in cells? What is the second most major element in cells? Why do animals contain more calcium than plants?
asked by Alicia 
astronomy help please
A planet is growing by accretion of material from the solar nebula. Suppose that as it grows, its density remains constant. Does the force of gravity at its surface increase, decrease, or stay the same? Why? Also, What would happen to the surface gravity
asked by Liz 
physics
Hi! I have a problem for physics homework and I though I knew how to solve it but apparently it is wrong, please help! 'Two cars, one of mass 1000 kg, and the second of mass 2400 kg, are moving at right angles to each other when they collide and stick
asked by Ty 
economics
If something happens and foreign consumers begin to buy more goods and services made in the United States, everything else held constant, what do you predict will happen to aggregate demand? I think it will move to the left.
asked by Tabby 
MATH
THERE ARE 7 GIRLS ON A BUS EACH GIRL HAS 7 BACKPACKS IN EACH BACKPACK, THERE ARE 7 BIG CATS FOR EVERY BIG CAT THERE ARE 7 LITTLE CATS ? HOW MANY LEGS ARE THERE IN THE BUS?
asked by ZACK 
math
If a penagonal prism has 7 faces and 10 verticies How man Edges does it have
asked by jackie 
science
what is the driving force of evolution among natural selection, genetic diversity, and environmental stress? The answer is environmental stress but i am not sure exactly why....can someone explain?
asked by Anonymous 
Math
Our teachers are having a toy drive. Mrs. A collected 10 more toys than Mr. B. Mrs. C collected twice as many toys as Mr. B. Mr. D collected 3 less than Mrs. C. Mrs. E collected 50 more than Mrs. A. Together they collected 487 toys in all and gave them to
asked by Brandon 
Algebra II
Solve x^4  12x  5 = 0 given that 1 + 2i is a root. I’ve used synthetic division to get the answers x = 1 +/ 2i , 1 +/ sqrt 2 I’ve having trouble checking the answers though because of that imaginary number. How can I check these kind of problems?
asked by Nick 
statistics
A specific brand of bike comes in two frames, for males or females. Each frame comes in a choice of two colors, red and blue, and with a choice of three seats, soft, medium, and hard. a) Use the counting principle to determine the number of different
asked by Rose 
world history// suggestions for essay
Please provide me suggestions for the Change over Time Essay, or Changes and Continuities Essay. Below is a rubric. Provide me tips on what to improve, expand, etc. Feel free to provide me some examples or give me topics/subjects to elaborate on. The
asked by Anonymous 
Spanish for Sam
OK. No sense doing a national holiday that has already passed. Here are 3 ideas: 1. Navidad = Christmas Day, December 25th. 2. Año Nuevo = New Year's Day, Jan 1st. 3. El Día de los Reyes = Epifanía = Epiphany, Jan. 6th = the day Spanish children get
asked by SraJMcGin 
DR Bob one more
1. calcium carbonate < calcium oxide + carbon dioxide dr. Bob Hydrolic acide + sodium hydroxide < sodium chloride + water this cant be balanced already as assignment says we must balance each one
asked by sam 
science
balance FeS2 + O2 < Fe2O3 + So2
asked by liz 
Physics
I thought I did the problem right, but I don't think I came out with the right answer! Please someone check to see if I got this problem right. Calculate the force of gravity between Earth (mass=6.0*10^24 kg) and the moon (mass=7.4*10^22 kg). The average
asked by Emily 
Math
Compare the population per square mile in Asia to the population per square mile in North America for the year 2000. Population in Asia in 2000 was 4,028,000,000. Population in North America in 2000 was 305,000,000.
asked by Patricia 
lit
o Do members of your community look like you? In what ways do they look the same or different? o How do leaders within your community treat people who are like you? How do they treat people who are different? o How do other members of your community treat
asked by Tasha 
literature
im writing a research paper on the easy company of wwii. well i have some info but my teacher said i have to make it controversial. any ideas on how i could do that. if so please get back to me
asked by jack 
calculus
A piecewise function is given. Use the function to find the indicated limits, or state that a limit does not exist. (a) lim is over x>d – f(x), (b) lim is over x>d + f(x), and (c) lim is over x>d f(x) x^2  5 if x < 0 f(x)= 2 if x >0 ; d = 3 1.
asked by Kelly 
Algebra HELP
USE LINEAR COMBINATIONS TO SOLVE THE SYSTEM OF LINEAR EQUATIONS (please show steps) 1) X+8Y=16 2) 4X+5Y=2 3)4Y=153X 3X+4Y=36 5X4Y=23 2Y=3X+21
asked by electra 
Chem
In the van der waals equation, the constants a and b are: 1)used to correct for the finite volume of gas molecules and the attractive forces between molecules 2)equal to each other for any real gas 3)used to correct for the difference between Celcius and
asked by Needs assistance 
reading
what is text clues?
asked by lan 
Physics
Robin Hood is walking through Sherwood Forest when he comes upon Sheriff of Nottingham. The Sheriff tells Robin Hood that he is going to arrest hum for numerous misdeeds. Robin pulls out his bow, loads an arrow, puls the bow back 0.70 m, and shoots an
asked by Jennifer 
chemistry
Give the names of these acids. A. HNO(subscript 2) B. HMnO(s.s. 4) C. HCN D. H(s.s. 2)S Write the names of these bases. A. LiOH B. Pb (OH) s.s. 2 C. Mg(OH)s.s. 2 D. Al(OH)s.s. 3
asked by anonymous 
dr bob HELP PLEASE
thanks dr Bob got through 6 now I am stuck again 1. Hydrochloric acid + Sodium hydroxide > sodium chloride + water 2. Magnesium hydroxide + hydrochloric acid > Magnesium chloride + water
asked by sam 
Spanish for Sam
At this point I only know you have a project due Monday. The sooner you give me more particulars, the sooner I can do research, or whatever else you need. Sra
asked by SraJMcGin 
world history/middle east/economics
nashville titans could sial to their game by cruising up the (10 blanks) River to its confluence with the (9 blanks) River then on to the (4 blanks) River.
asked by Anonymous 
economics
Which federal agency is responsible for managing inflation? The Department of Housing and Urban Development, The World Trade Organization, or The International Monetary Foundation? I think it is The World Trade Organization.
asked by Tabby 
geometry
a right traingle has legs of lengths 3 centimeters and 5 centimeters. Use the pythagorean theorem to find the area of a square drwan on the hypotenuse of the triangle.
asked by Andrew 
BEH / 225
On the text from BEH/225 on the book Personality Ch.11 pp. 421 on the summary table Defence Mechanisms. What defense mechanisms have you noticed in the people around you? What do you see as the advantages and disadvantages of these defence mechnaisms?
asked by Martin 
Math
How do you find the tax, and estimate the tip of a price?
asked by Niara 
math
how do you find the greatest common of. 16 and 42; 8 and 18; 77 and 15
asked by ryan 
science pproject
what would happen top a sunflower if it were left without sunlight for six days
asked by Anonymous 
english
fallen angels we read that book in class. now my teacher want us to build a handbook for new recruits on surviving vietnam. k my question is how do u make a handbook i am so lost thanks
asked by bre bre 
physics
what are the two opposing forces at balance in our sun? describe how the two opposing forces balance each other
asked by rosio 
statistics
Select five random numbers between 70 and 100. Calculate the mean, median, mode, and midrange of these numbers. Based on your calculations, which measure of central tendency best represents these numbers?
asked by Rose 
Math  Logarithmic
Is the following correct when restating logs with variables to exponential? Log: log_a(a^3)  base = a Exp: a^3 = a I know when dealing with real numbers, this is what you do: Log: log(10^5) Exp: 10^5 = 100 000
asked by Anonymous 
math
how many ounces are in a pound?
asked by christina 
World history
May you give me suggestions on how to improve this essay: Change of Time (or Changes and Continuities Essay)?
asked by Anonymous 
Microsoft PowerPoint
Please can anyone help me with my problem. Does anyone know how or can tell me a free website to find out how to create a Microsoft Powerpoint slide presentation(8) with speaker notes,visual aids and graphics.
asked by Mckenzie 
statistics
Select five random numbers between 70 and 100. Calculate the mean, median, mode, and midrange of these numbers. Based on your calculations, which measure of central tendency best represents these numbers?
asked by Rose 
statistics
Construct a frequency distribution of the ages that 25 randomly selected smokers started smoking: 26 26 25 17 16 16 14 17 21 16 16 18 17 15 15 19 16 17 22 15 19 17 16 27 16
asked by Rose 
math
60 is 25% of what number
asked by jordan 
math
40% of what number is 82
asked by jordan 
math
73 is 20% of what number
asked by jordan 
science
how do you balance the equation below? Mg + O2 > MgO
asked by liz 
Wind energy
How does wind energy get to you? Like I know you would have to have a mill in your yard but how does it get to the house?
asked by Randi 
linguistics
what do you mean by a "target language"???...
asked by pray_the_rosary 
art
Which phrase best describes the style of Rodin's sculptures? psychological and unfinished, NeoClassical yet lighthearted, unfinished and lighthearted, unfinished yet polished? I think it is unfinished and lighthearted.
asked by Tabby 
sci
Although most salamanders have four legs, the aquatics salamander shown below resembles an eel. It locks hind limbs and has very tiny forelimbs. propose a hypothesis to explain how limbless salamanders evolved according to Darwin's theory of natural
asked by Amber 
world history
who was the German monks credited with starting a religious revolution after he had grown disillusioned with what he perceived as the corruption and worldliness of the Roman Catholic Church?
asked by Roderick 
art
How do we know that the woman in "Portrait of a Lady" was a member of the upper class?
asked by Tabby 
sra McGuin
Hi I am making a recipe for a smoothie please edit my draft as I will turn it in tommorrow Como hacer un batido de fresas y kiwis 1. Primero, necesitas tener una licuadora, cinco kiwis, seis fresas, jugo de nurijo, hielo, un cuchmillo, y unos vaos. 2.
asked by sam 
economics
Decreasing the money supply involves which type of economic policy? I think it is Monetary policy.
asked by Tabby 
physiology
what is the procedure for WBC count
asked by suhani 
Anatomy
how does hemoglobin carry O2 in the blood?
asked by Jeani 
Orbital Dynamics
The zerovelocity value of the Jacobi integral at the L2 point of the EarthMoon system is C= 1.59411. Suppose a spacecraft is newar Earth (r2=1/60 in our descriptions). Approximately waht speed must the craft have realtive to the rotating system if it is
asked by Ali 
Orbital Dynamics
The zerovelocity value of the Jacobi integral at the L2 point of the EarthMoon system is C= 1.59411. Suppose a spacecraft is newar Earth (r2=1/60 in our descriptions). Approximately waht speed must the craft have realtive to the rotating system if it is
asked by Ali 
Science
What is a plant and animal seen regularly in the sotheast region (Georgia)?
asked by Danny 
Math
What is the product of 7/16, 4/3 and 1/2?
asked by Kate 
philosophy
Beautiful harmony comes from things that are in opposition to one another [Heraclitus ok i need to write my personal philosophy and i cant think of any examples of this quote for my body pargraphs...except velcrow..i don't think that a good one thought
asked by chels 
social study
how is thegeography of Italy and Greece similar?
asked by Chris 
science
Beside people, what is the only animal that develops colon cancer on its own?
asked by Amanda 
Algebra One
x/3=2/5
asked by Aaliyah 
wr
what is a grumpy ocean dweller? (4) letters? ocean greetings? (5) letters? Thank you! Thank you!!1 crossword!
asked by roy 
French
How do you invert the following into a question? Elle dine a huit heures.
asked by Melissa 
Math
OK I need so much help: i can't figure out this problem, and if i don't get it right i get an f on the assignmrnt: ok here is the problem: 5/6n+4= 5 7/8 HELP
asked by Serena 
com 125
What questions do you ask when evaluating a source, and why?
asked by Anonymous 
Algebra I
Wrtie a function using the table below. X Y 5 2 0 7 5 12 10 17
asked by Mary 
literature
can anyone help me with this exam 00779000 please i need your help
asked by Ian 
math
what number is 32% of 1,000
asked by jordan 
Math
2x+y=5 xy=4 i kno the answer but i just want to make sure..am i in rite place lol
asked by Nemo 
anatomy
do arteries carry blood to or from the heart?
asked by Hillary 
math
57% of 109 is what #
asked by jordan 
algebra
What is 2 = x+1 ?
asked by Teresa 
algebra
(1,2),(2,6)
asked by Anonymous 
sci
description of a typical precipitation and temperature for summer and winter. Then identify the characteristics of a plant and animal that is seen regulary in your region? How do the characteristics relate to the amount of rain or sunlight in your region?
asked by jamie 
Math
I'm trying to calculate probablity of dependent and independent events. For example, from 3 nickels, 2 dimes, and 5 quarters, what is the probability of drawing 1 nickel, 1 dime, and 1 quarter in that order without replacement? Or drawing the same in any
asked by Danielle 
english
What does the term arbitrary mean?
asked by nancy 
world history
what is the name for the periord in which there was a production shift from simple hand tools to complex machines and from human and animal power to steam power?
asked by Roderick 
math
I'm just not good at word problems can someone help pleaes thanks a head of time An arithmetic student needs an average of 70 or more to receive credit for the course. She scored 89, 76, and 65 on the first three exams. Write an inequality representing the
asked by keauanna 
Math
I am in Calculus and am currently learning how to find the Area of a Surface of Revolution. I cannot understand what the surface of revolution (whether it's the xaxis, yaxis, or y=6) is. For example, I had a problem saying to use the washer method to
asked by Suzie 
english
I have to write a paragraph about a vacation spot using order of importance and I have no idea where to begin. Can someone help me start?
asked by Tabby 
economics
Will buying bonds decrease the money supply?
asked by Tabby 
Eth
o Trends in immigration will continue to shape the face of the United States. What will this face look like in the year 2050? o How can the country best prepare for the changing race and ethnicity of its current and future citizens?
asked by kisha