Wednesday

September 17, 2014

September 17, 2014

Number of results: 41,731

**chem/plz/check work studying for a final**

23. A 32.3 L sample of a gas at 305oC and 1.20 atm is to be cooled at constant pressure until its volume becomes 28.4L. What will be the new gas temperature? Tf = Vf*Ti/Vi Tf =28.4L x (305+273)K / 32.3L = (28.4)(578)K / 32.3 = 16415.2/32.3 Tf = 508K I got this one wrong on a ...
*December 16, 2010 by julia*

**chem/plz/check work studying for a final**

what is the volume occupied by 16.0g ethane gas (C2H6) at 720 Torr and 18C? V=nRT/P conversion of mol: 16.0g C2H6 X 1mol C2H6/30.07g C2H6= .53mol C2H6 V= .53 mol(0.0821 L*atm/mol*K)(291)K / 720 Torr (1 atm/760Torr) V= 13.5 L
*December 16, 2010 by julia*

**chem/plz/check work studying for a final**

what is the volume occupied by 16.0g ethane gas (C2H6) at 720 Torr and 18C? V=nRT/P conversion of mol: 16.0g C2H6 X 1mol C2H6/30.07g C2H6= .53mol C2H6 V= .53 mol(0.0821 L*atm/mol*K)(291)K / 720 Torr (1 atm/760Torr) V= 13.5 L
*December 16, 2010 by julia*

**chem/plz/check work studying for a final**

A 20.5 lb cast iron boat anchor displaces 1.33 qt of water when submerged. What is the density of the cast iron, in g/cm3? 1L=1.057 qt 1kg=2.205lb 1lb=453.6g 20.5lb X 453.6g/ 1lb = 9298.9g 1.33qt X 1L/1.057qt = 1.26L 1.26L X 1000cm3/1L = 1260cm3 9298.9g/1260cm3 = 7.38g/cm3 **...
*December 16, 2010 by julia*

**Final-Chemistry**

I have finals coming up in a week and a half. I know I should have started studying earlier, but I just had an exam in my chem class and was focused on getting the information for that exam mastered before I started studying for the final. Now, I'm overwhelmed. I have no idea ...
*November 30, 2009 by Katherine*

**Plz -- Chem Help**

Posted by Rushi on Sunday, March 15, 2009 at 3:35pm. Question.. Nicotinic acid (niacin) is a monoprotic acid with the formula HC6H4NO2. A solution that is 0.012M in the nicotinic acid has a pH of 3.39 at 25C. what is the acid-ionization constant, Ka and pKa for this acid at ...
*March 18, 2009 by A*

**Physics please check**

Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2531 J of heat are added to the gas, and 1101 J of work are done on it. What is the final temperature of the gas? delta U= 3/2nR(T final -T initial) (2531J - 1101J) = 3/2(3.0mol)(8.31)(T final - 345K) ...
*April 15, 2007 by Mary*

**DR BOB help plz ?**

Methyl violet is an indicator that changes color over a range from PH = 0 to PH= 1.6. What is K(a) of methyl violet? ----------------------------------- i tried 10^-0.8 = 0.16 but thts not right .. can u plz chk ... Feedback Very close. Check the rounding and number of ...
*March 1, 2009 by julian*

**chem- plz check my work**

2. Given the following equation, C2H5OH(l) + 3 O2(g)---> 2 CO2(g) + 3 H2O(l) How many liter of CO2 are expected in the combustion of 12.0 grams of ethanol? My work: 12.0g C2H5OH X 1 mol C2H5OH/46.08g C2H5OH X 2 mol CO2/1 molC2H5OH X 22.4L CO2/1 mol CO2 = 11.7 L CO2 all i ...
*December 8, 2010 by hannah*

**Chem -plz check work**

so i've worked on this some more, now I am asking if someone will plz check my work 2 half cells in a galvanic cell consist of one iron Fe(s) electorde in a solution of iron (II) sulphate FeSO4(aq)and a silver Ag(s) electrode in a silver nitrate solution, a)state the oxidation...
*June 3, 2008 by Sarah H*

**Physics repost please check**

Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2531 J of heat are added to the gas, and 1101 J of work are done on it. What is the final temperature of the gas? delta U= 3/2nR(T final -T initial) (2531J - 1101J) = 3/2(3.0mol)(8.31)(T final - 345K) ...
*April 16, 2007 by Mary*

**Statistics**

A survey among freshmen at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 25 and standard deviation 15. A sample of 36 students was selected. What is the probability that the average time ...
*June 20, 2013 by Anonymous*

**Physics please check**

Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2531 J of heat are added to the gas, and 1101 J of work are done on it. What is the final temperature of the gas? delta U= 3/2nR(T final -T initial) (2531J - 1101J) = 3/2(3.0mol)(8.31)(T final - 345K) ...
*April 15, 2007 by Mary*

**Physics please check repost**

Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2531 J of heat are added to the gas, and 1101 J of work are done on it. What is the final temperature of the gas? delta U= 3/2nR(T final -T initial) (2531J - 1101J) = 3/2(3.0mol)(8.31)(T final - 345K) ...
*April 15, 2007 by Mary*

**chem/some1 check my work plz.**

2NH3(g)+3CuO(s)=N2(g)+3Cu(s)+3H2O(g) if 18.1grams of ammonia reacts with 90.4 grams of copper(II) oxide, which is the limitting reagent?? what is the theorectical yield of nitrogen gasd? if 8.52 g of N2 are formed, what is the % yield of nitrogn gas?? please check if is ...
*November 16, 2010 by julia*

**Chem -plz check work**

suppose that 2.00 mL of 0.01 mol/L sodium sulphide is used to test a 50.0 mL sample of water containing 0.0005 mol/L mercury nitrate ions. What mass of precipate is formed? Na2 = Hg(NO3)2 --->2NaNO3 + HgS My Work: nNa2S=0.002*0.01 =0.0002 mol nHg(NO3)2=0.05*0.0005 =0....
*May 28, 2008 by Lori*

**chem**

stilll didnt get it .. .. can u plz explain in detail ... how did u get the answer.. plz plz plz plz plzp l zp thnks Bond enthalpy is the energy required to break a mole of a certain type of bond. O=O = 495 kj/mol S-F = 327 kj/mol S=O = 523 kj/mol Use average bond enthalpies ...
*November 12, 2008 by DR BOOBB Plz HELP*

**Genetics (plz check answer)**

Question: Calculate the frequency of the AA, Aa, and aa genotypes after one generation if the initial population consists of 0.2 AA, 0.6 Aa, and 0.2 aa. What I have done is: P = (0.2)+(0.5)(0.6)= 0.50 q = 1-p = 1 - 0.50 = 0.50 Can someone check my answer plz.
*December 6, 2006 by Josh*

**bio (plz check answer)**

Question: Calculate the frequency of the AA, Aa, and aa genotypes after one generation if the initial population consists of 0.2 AA, 0.6 Aa, and 0.2 aa. What I have done is: P = (0.2)+(0.5)(0.6)= 0.50 q = 1-p = 1 - 0.50 = 0.50 Can someone check my answer plz.
*December 7, 2006 by Josh*

**Studying for Calc**

I have a quiz on derivatives coming up and I really want to do well, but i'm not sure how to go about studying calc. i have no trouble studying for other subjects, but i'm doing poorly in calc and i need to make some changes in my study habits. any suggestions? i usually work ...
*October 7, 2008 by Elizabeth*

**TRIGONOMETRY**

Can you please help me with this question on my study guide for my trig final? Thanks! I'd also appreciate if you can check out my other postings and check my work for some other study guide questions. I want to make sure I'm ready for my final. :) 4. Transform each polar ...
*May 16, 2013 by Kate*

**TRIGONOMETRY**

Can you please help me with this question on my study guide for my trig final? Thanks! I'd also appreciate if you can check out my other postings and check my work for some other study guide questions. I want to make sure I'm ready for my final. :) 3. The rectangular ...
*May 16, 2013 by Kate*

**English**

A team of explorers ___________ the ocean floor. A.were studying B.are studying C.have been studying D.has been studying I think it is D...?
*March 3, 2013 by Cassie*

**Lingusitics**

Hello everyone!! For these six sentences, I have to explain what determines whether the sentence is grammatical or not 1) Both the students were studying. 2) The students were both studying. 3) They were both studying. 4) *Both they were studying. 5) Both of you were studying...
*March 26, 2011 by Bobby *

**LIVING ENVIRONMENT**

the ability to grow in size is a characteristic of living organism .Although an icicle may grow in size over time,it is considered nonliving because there is 1)an incerase in matter ,but no increase in the number of icicle. 2)an interaction between the icicle and the ...
*February 12, 2013 by tania sharmin*

**chem -repost for bobpursley**

i don't know how to solve this. looked through all my notes but i'm not sure what kind of formula i am to use or if i even need one! please help me to understand the theory behind this: "calculate the work need to make room for the products in the combustion of S8(s) to SO2(g...
*April 17, 2011 by please, help me *

**math ps. help**

Time Spent Studying (in hours) The time spent studying, in hours, on a daily basis of 9 different students was used to create the box plot shown above. Which of the sets of times below matches the given box plot? Time Studying: 0, 0, 0.5, 0.5, 0.5, 0.5, 1, 2, 2.5 Time ...
*January 22, 2014 by anthony awsome*

**Math (quick check plz)**

hi i rearranged these terms into y=mx+b can you plz check and see if they're right? 1. 2x+5y-16=0 2. 4x-3y-6=0 3. 3x+y+2=0 1. 5y=-2x+16 2.3y=-4x+6 3. y= -3x-2 tnx ^^ On the first two, you need to divide each side by the coefficent of y. On two, what happened to the negative ...
*March 19, 2007 by gorden*

**Urgent Chem help plz**

is answer +103 KJ.. plz chk Plz explain in detail.... i tried to search on internet but i am confused with co-efficents.. how to set up the equaiton .. plz help me ??? Bond enthalpy is the energy required to break a mole of a certain type of bond. O=O = 495 kj/mol S-F = 327 kj...
*November 12, 2008 by Sarah*

**I NEED HELP!!:(!!!! HELP ME PLZ!!**

I GOT A FEW QUESTIONS SO what is a cell part that has the funcion of a gel-like material inside cells... and what releases energy into the cell.?? plz plz plz plz HELP!!!
*October 20, 2009 by i really need help!!*

**bio check plz plz plz**

in human (2n=46) mitosis result 2 cell with 23 chromoses and meosis result in (n=23) 4 cell with 46 chromoses... is this statment true ? please help me ....
*November 28, 2011 by hiba*

**Discrete Mathematics**

A tutor website wants to see how time spent studying for its content exams affects the ultimate scores. It asked its finite math test takers how much time they spent studying for the exam and compared that data against the final scores out of 60 points. It came up with the ...
*July 30, 2013 by Joy*

**Discrete Mathematics**

3. A tutoring site wants to see how time spent studying for its content exams affects the ultimate scores. It asked its finite math test takers how much time they spent studying for the exam and compared that data against the final scores out of 60 points. It came up with the ...
*July 30, 2013 by Joy*

**Science**

I need to observe and identify variables and I'm in 6th grade!!! Help, this work is killing me....It's scenario 1-4 and I have Mr Jones plz help plz
*August 31, 2012 by Destiny*

**CHEM**

At constant pressure, which of these systems do work on the surroundings? Check all that apply. 2A (g) + B(s) --> 3C(g) 2A (g) +2B (g) -->5C(g) A(g)+ B(g) --> C(g) A (s) +2B(g)--> C(g)
*February 10, 2012 by Akle*

**chem/some1 check my work plz.**

nitrogen gas contained in a cylinder with a volume of 5.0x10^2 mL @ a temp of 30C and pressure of 710 torr. The gas is then compresse to a volume of 25mL and the temp. is reaised to 820C. what is the new pressure of the nitrogen gas?? Pf=p1*v1*t1/Tf*Vf P=(700torr)(5.02x10^2mL...
*November 16, 2010 by julia*

**Math ....urgent help**

i just dont get this elimination method ..... plz help me plz.....teach me how to keep the x and y in a parallel line. and which number to multiply.....plz help -5x-4y=-11 10x=-6-y help me plz......
*January 7, 2009 by vero*

**physics**

You do a certain amount of work on an object initially at rest, and all the work goes into increasing the objectfs speed. If you do work W, suppose the objectfs final speed is v. What will be the objectfs final speed if you do twice as much work? 1. 4 v 2. 2 v 3. Still v 4....
*January 16, 2010 by Anonymous*

**physics**

You do a certain amount of work on an object initially at rest, and all the work goes into increasing the object's speed. If you do work W, suppose the object's final speed is v. What will be the object's final speed if you do twice as much work? 1. 4 v 2. 2 v 3. Still v 4.v...
*January 16, 2010 by Anonymous*

**chem 2**

What is the concentration of the final solution if 1 liter of 6 M HCl is diluted to a final volume of 2 L?
*November 22, 2012 by don *

**Statistics/probability**

Of 120 students, 60 are studying French, 50 are studying Latin and 20 are studying French and Latin. Find the probability that a student is: (a) studying French or Latin and (b) studying neither.
*March 19, 2009 by Carline*

**biology**

a boy inherits genes for tallness,but his growth is limited as a result of poor nitrition. this is an example of 1)an inherited disorder. 2)environmental influence on gene expression . 3)expression of a hidden trait 4)a characterstic controlled by more than one pair of genes. ...
*February 8, 2013 by tania sharmin*

**Physics ~Work Kinetic Energy~**

1.)A ball (m 0.5 kg) starts from rest and has 300 J(joule) of work applied to it. a) what is the initial kinetic energy of the ball? b) what is the final kinetic of the ball? c) what is the final velocity of the ball? 2.)A boy is doing chin-up. If the boy does 450 N of work to...
*January 30, 2013 by Isis*

**Chem**

Find and show work the final pH when 35mL of 0.200 mol/l sulfuric acid are titrated with 18mL of 0.030 mol/L sodium hydroxide?
*May 26, 2010 by S.S*

**chem**

a 9.6L sample of hydrogen gas (H2) @ 88 degrees C is cooled until its final vol was 3.4L. If ther are no pressure changes what is the final temp?
*April 25, 2011 by ALEX5*

**Chemistry**

What is the molarity of a phosphoric acid solution if 32.3 mL of the phosphoric acid solution is titrated to the final equivalence point with 20.6 mL of 0.581 M sodium hydroxide acid solution? H3PO4 + 3NaOH ==> Na3PO4 + 3H2O mols NaOH = 0.0206L*0.581 M= ?? mols H3PO4 = 1/3...
*February 11, 2007 by Question*

**Math check**

2[3(8-2 2)-6] my answer is 204 and btw it's not 22 it 2 power of 2 . Plz check it
*December 2, 2011 by Madad*

**physics**

You do a certain amount of work on an object initially at rest, and all the work goes into increasing the object's speed. If you do work W, suppose the object's final speed is v. What will be the object's final speed if you do twice as much work? 1. 4 v 2. 2 v 3. Still v 4.v/(...
*January 16, 2010 by Anonymous*

**chem homework help**

can you check my work? Give the conjugate acid for each of the following bases. A. CN- = HCN B. SeO4^2- = HSeO4- C. HCO3- = H2CO
*April 25, 2010 by Anna*

**sociology**

hi people actually i need 2 do a project on sociology for 20 marks n i cant decide which on a topic ca u all plz help n v also need 2 have a survey or 30-40 interviews plz plz plz plz help its urgent It would really help us teachers if you would write in standard English so we...
*August 13, 2007 by aditi*

**Chem 1000**

A Cylinder is filled with 1.20 mol of He(g) at 25 C under ambient pressure of 0.966 atm. The gas in the cylinder is then heated with 1.430 KJ of heat, and the piston is raised by the expanding gas under the constant ambient pressure. Calculate the following after expansion. a...
*October 16, 2010 by J Velji*

**Alg-Substitution (check plz)**

k well i had to use substitution to find the point of intersection for these 2 equations x-y=10 3x+y=11 i chose to substitute y in the first equation my final answer was (-1/2 , 5) can someone clarify this, and if it's wrong, where'd i make a mistake? In the first equation, y...
*February 22, 2007 by thomas*

**Algebra**

I am having issues with factoring. I am trying to check my work using a TI84 Plus calculator but I don't know how to plug in a problem to check its factoring. Can anyone help? for example 44y^3+55y^2-11xy how can I go about plugging that in to check my work?
*March 27, 2014 by Christopher*

**english**

can u edit this and add a little more plz like 2-3 lines plz in easy words, it is from the book we are all welcome here by elizabeth berg: Historically the work is significant because it gives us an insight of the horrors of the civil war, which asserted the rights of the ...
*January 11, 2010 by sana*

**Plz someone Chem Urgent Help**

The overall energy involved in the formation of CsCl from Cs(s) and Cl2 (g)is - 443 kj/mol. Given the following information: •heat of sublimation for Cs is +76 kj/mol, •bond dissociation energy for ½ Cl2is +121 kj/mol, •E(11) for Cs is +376 kj/mol, and •E(a) for Cl2is 349 kj/...
*January 16, 2009 by Samenia*

**studying**

I was wondering if anyone had some good studying tips. I have a big science test tomorrow and I need to learn the material very quickly. Write know I am saying the words out loud as I re-write them. My teacher always tells that studying IS NOT reading.
*October 15, 2009 by 1234*

**studying for chem 2**

My professor really likes conceptual problems and that is what we will be tested on. How can I practice concept questions??
*September 17, 2011 by Lauryn*

**P.E /.....**

PLZ PLZ PLZ HELP. Trying to get over quiz Harvey has his heart set on making the state finals for his track team in the 100 yard dash. Although Harvey knows there are many factors to improving his time and becoming an elite sprinter, one skill is paramount to his success. ...
*December 21, 2013 by Samantha*

**homework college chem.**

a sample of gas occupies a volume at 73. 1 mL. As it expands, it does 135.0 J of work on its surroundings at a constant pressure of 783 torr. what is the final volume of gas?
*February 26, 2012 by danielle*

**Math**

Can someone check my work? the problem is: x=2+3/y and I have to solve for y I get rid of the denominator y and multiply it with X...so it looks like xy=5 then just divide by x on both sides for a final answer of y=5/x
*September 1, 2013 by George*

**math**

17.Given that 3•2 = 9, 2•6 = 64, 1•7 = 1 and 4•4 = 256. What is the value of 10•5? A)50 B)100 000 C)5000 D)5 plz explain how you get this answer i am studying the sample questions for the math olympics tommorow so i need to know what they will be like.
*February 26, 2014 by help*

**english**

Late into the night, Isabel is often studying. Is the complete predicate is often studying? Is the simple predicate studying?
*September 15, 2009 by hunter*

**college algebra-plz help**

a circle has the equation 3(x-5)^2_3y^2=12. Find the center and radius and graph the circle. find the intercepts, if any. plz show work
*December 9, 2012 by James*

**math help plz**

You receive 80% on your first midterm while your friend receives 70%. Taking into consideration the fact that the first midterm is worth 14% of your overall mark, the difference (between receiving 70% and 80% on your midterm) this could make in your final mark is? How would I ...
*September 19, 2010 by May*

**Physics(Please respond)**

1) A roller coaster (398 kg) moves from A (3.82 m above the ground) to B (29.4 m above the ground). Two non-conservative forces are present: friction does -1.82 x 104 J of work on the car, and a chain mechanism does +5.49 x 10^4 J of work to help the car up a long climb. What ...
*June 3, 2012 by Hannah*

**math**

the volume of a rectangular solid is given by expressions given below.in each case find the dimentions of the solid. a)15x^2-51x+18. b)x^3+13x^2+32x+20. c)x^2-5x/2-3/2. d)x^4+x^3-x-1 plz everyone help me out.till 2 o'clock...plz plz plz
*May 30, 2012 by parul*

**math**

the volume of a rectangular solid is given by expressions given below.in each case find the dimentions of the solid. a)15x^2-51x+18. b)x^3+13x^2+32x+20. c)x^2-5x/2-3/2. d)x^4+x^3-x-1 plz everyone help me out.till 2 o'clock...plz plz plz
*May 30, 2012 by PLZ HELP ME NOW...*

**Chem 100**

If the initial volume is 150mL and the final volume is 1L, what is the final pressure?
*March 1, 2012 by Jen*

**pscychology**

Could someone pretty plz plz plz help me...What are the 2 biggest parts of the human brain??
*March 11, 2009 by Logan:)*

**Adding and subtracting fraction**

On Monday Roger spent 8 1/10 hours studying. On Tuesday he spent another 1 3/10 hours studying. What is the combined time he spent studying?
*February 20, 2014 by Chyna*

**Algebra**

Hello, can someone tell me if I got the following solve and check work correct? 1. solve and check 1/2x = 3 5/6 1/2x = 3 5/6 1/2x = 23/6 3x = 23/3 x = 23/3 And to check for it 1/2x = 3 5/6 1/2x = 23/6 46x = 6 x = 6/46 x = 3/23 2. Solve and check 3x + 2 / 2 = 7 3x + 2 / 2 = 7 ...
*April 13, 2010 by Tamir*

**SCIENCE!!--ANONYMOUS PLEASE ANSWER MY QUESTION!**

plz answer the question we were talking about plz plz. Go back to the problem. I got 184 but the worksheet answer says 136 which is correct?? plz help!! thx
*September 13, 2010 by Happy Face*

**chem/some1 check my work plz.**

air bags actived when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. this causes NaN3 to decompose explosively according to the following reaction: 2NaN3(s)=2Na(s)+3N2(g) what mas of NaN3 must be reacted to inflate an air bag ...
*November 16, 2010 by julia*

**Liberal Arts Math**

show work simplify:(a-9b)(a+3c) (a-9b)(a+3c) a^2+3ca-9ba-9bc I'm pretty sure this is how you do it... plz check some standard formula to remember are; i: (a+b)^2=(a+b)(a+b)= a^2+2ab+b^2 ii: (a-b)^2=(a-b)(a-b)=a^2-2ab-b^2 iii: (a+b)(a-b)= a^2-b^2 look at the patern and work out...
*May 10, 2007 by Maria*

**ACT Math**

Of the 60 students in a school, 24 are currently studying chemistry. Exactly 16 of the girls in the school are not currently studying chemistry. The number of girls in the school is 33. How many boys are currently studying chemistry? Correct answer is 17. How did they get that...
*August 27, 2013 by Java*

**PLZ HELP....STATS**

You are given the following data. # of Absences Final Grade 0 96 1 92 2 71 3 66 4 60 5 51 A. Find the correlation coefficient for the data. B. Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.
*October 23, 2011 by Jennifer*

**English**

Could you please check these sentences? Thank you very much. 1) Before he went to Celtic Camp, Johnny did some mock exams as a preparation (to prepare) for his A-level exams. 2) Kane suggests he should copy his essays from the net. Johnny refuses (to follow her advice) though ...
*September 26, 2011 by Henry2*

**Comm/215**

Q: Studying is hard work many students find they study better when they take regular breaks. A: Studying is hard work, many students find they study better when they take regular breaks. Is this correct?
*June 17, 2010 by David*

**Math**

A does 20% less work than B .If a complete a piece of work in 7& 1/2 hours then B can do it in options- 5,5&1/2,6,6&1/2 plz solve without using x and y method
*April 27, 2011 by Apoorv*

**Physics**

I'm stuck on this problem. "You mix 100 ml 60 degree C water with 100ml 20 degree C water. Find the final temperature" Changing 100 ml to .1kg, I set .1*4186*(60-final temp.) + .1*4186*(final temp-20)=0 but my t's cancel out. I know it would work if I set my first half of ...
*April 28, 2009 by Brigid*

**chem**

What is the pH of a 0.36 M HCl solution? can someone help plz? I don't know how to go about figuring this out.
*August 24, 2007 by Gulzaman*

**physics!! plz answer me!**

A 0.15 kg baseball moving at +26 m/s is slowed to a stop by a catcher who exerts a constant force of -390 N. How long does it take this force to stop the ball? How far does the ball travel before stopping? plz plz plz help!!
*December 10, 2007 by julia*

**statistics**

A survey was conducted at a school to determine how many students use the outside recreational areas for studying versus recreational. Out of 43 students at the park 25 students were not studying. What is the probability that you would come across a student studying at the park?
*September 6, 2014 by thankyou*

**chem/some1 check my work plz.**

air bags actived when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. this causes NaN3 to decompose explosively according to the following reaction: 2NaN3(s)=2Na(s)+3N2(g) what mas of NaN3 must be reacted to inflate an air bag...
*November 16, 2010 by julia*

**Math**

Lee has two tests to study for: Chemistry and French. She plans to study for up to 13h in total. She will spend at least 4 hours studying Chemistry and up to 6 hours studying French. Let x represent the number of hours she will spend studying Chemistry, and y the number of ...
*July 24, 2009 by Elle*

**Chem II (urgent plz)**

Consider a titration of 50.00 mL of 0.1005 M HCl with 0.1012 M NaOH.
*July 17, 2007 by Jessie*

**Chem for final, please help!**

How many moles of H+(aq) ions are present in 1.25 L of 0.75M Nitric Acid? A. 0.60 mol B. 0.75 mol C. 0.94 mol D. 1.7 mol E. 1.9 mol Please show me how to work this!
*December 7, 2010 by lavonne*

**Physics**

A car with mass m require 5.0 KJ of work to move from rest to a final spee v. If this sam amount of work is performed during the same amount of time on a car with a mass of 2m, what is the final speed of the second car.
*May 20, 2012 by Cristiao*

**English.. Literature... books**

can u give me multiple choice questions from the "examview" on the story "A Noiseless Flash" from Hiroshima by John Hersey ... i really need to practice this selection. Plz if u can, copy and paste the questions because the link you might send me would not work ... "Laptob ...
*March 11, 2011 by tara*

**Language (gerunds)**

Pam is studying for her French exam. I know that studying is the gerund, but is it a do, io or predicate nominative?
*November 30, 2010 by michael*

**Chem Check Please!!!**

Using standard thermodynamic data from Appendix L of your text, calculate the equilibrium constant at 298 K for the following chemical reaction: CO(g) + H2O(l) CO2(g) + H2(g). Show work please! Thank you!!!
*March 16, 2014 by Layla*

**FRENCH WORK ASAP**

please please someone check my work I don't understand it fully so I am asking if someone could please check my work thank you if it's too much I'm sorry. God Bless
*January 21, 2009 by Hellokitty1993*

**Intermediate Algebra**

how do you find the prediction equation for a given set of data? plz help final tomorrow!!
*January 21, 2009 by Tyler*

**studying**

what are some good last minute studying tips?
*December 17, 2007 by sara*

**Ms.Sue (ONLY)**

can you plz help me in science? PLZ HELP ME! YOU HELP ALL THE TIME! *begs* plz help! i am my knees!!!!! (really i am!) its called "science 8th grade"
*March 7, 2012 by sammie doodles :-)*

**grade 10 history**

I have a SUPER HUGE project due called National History day and need lots of help with it, plz plz plz help!!!!!
*January 20, 2013 by Macy*

**Chem**

When 100mL of 0.60mol per liter K3BO3 is added to 200 mL of 0.40 mol per liter Ca3(BO3)2 Find a)moles of K3BO b) moles of Ca(BO3)2 c)final concentration of K+ d)final concentration of Ca+2 e) final concentration of BO3 negative 3
*March 19, 2014 by BILL*

**Plz,plz help!**

Can you help me write: real-world scenario in which you would write an inequality rather than an equation? Plz, I really need help! :D
*January 21, 2014 by Princess Anna*

**physics plz help**

I need help in calculating work. following quantites are given. * G: 6.67E-11 *Mass of earth:5.98E24 *mass of satelightt:80kg *x(initial) center of the earth-7E6 m *x(final) center of the earth 12E6 m How do I make integral equation I need use 20 interval or calculate in excel...
*April 7, 2014 by jenny*

**math (plz help)**

Ms. Sue has not answered this question where all work must be shown. Plz, Ms. Sue do not answer this one again. Let someone else help me...plz. In a movie theater, Theater A has 30 seats in the first row. Each row has 4 more seats in it than the previous row has. 1) How many ...
*March 14, 2011 by Stacy*

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