Popular questions and responses by Chopsticks
  1. Chem

    How much water must be added to 500.mL of .200M HCL to produce a .150M solution? (.500mL x .200M)/.150M = .667mL Correct? A chemistry student needs 125mL f .150M NaOH solution for her experiment, but the only solution avail. is 3.00M. Describe how the

    asked on May 1, 2009
  2. Chemistry

    A sample of Oxygen has occupies 1.00x10^6mL at 575mm Hg is subjected to a pressure of 1.25atm. What will the final volume of the sample be if the temperature is held constant v2=(p1)(p2)/p2 I'll have to convert 1.25atm to mm first 1.25atm*760mm/1.0atm =

    asked on March 18, 2009
  3. dilution

    Many labs keep bottles of 3.0M solutions of the common acid on hand. Given the following molarities of the concentrated acids, determine how many mL of each concentrated acid would be required to prepare 225mL of a 3.00M solution of the acid Acid: HCl

    asked on April 30, 2009
  4. Chemistry

    What is the limiting reactant when 19.9g of CuO are exposed to 2.02g of H2 according to the following equation? CuO + H2 ---> Cu + H20 My attempt at this: 19.9gCuO * 1moleCuO/79.539gCuO * 1moleCu/1moleCuO = .250moleCu 2.02gH2 * 1moleH2/2.016gH2 *

    asked on March 4, 2009
  5. Algebra 2 help

    1. (3ã6 * 4ã6)^12 Answer :6^7 2. 3ã9 * 3ã6 / 6ã2 * 6ã4 Answer: 3 Can you guys show me how to work those? I got the answers from back of the book, but I have no idea how to work it. The number behind the square root sign is the nth.

    asked on January 25, 2009
  6. Chemistry

    At standard temperature, a gas has a volume of 275mL. The temperature is then increased to 130. Celcius, and the pressure is held constant. What is the new volume? How do I work this? v1 = 275mL t1 = 130. C or 403K v2=??? t2 = ??? Can someone help me

    asked on March 19, 2009
  7. Chemistry

    A silicon chip is used in an integrated circuit of a microcomputer has a mass of 5.68 mg. How many Si Atoms are present in this chip. Okay here is how I worked it. Can someone please tell me if its right? 1 mole of Si = 28.086g = 6.022 x 10^23 5.68mg of Si

    asked on January 6, 2009
  8. Chemistry

    Three of the primary components of air are carbon dioxide, nitrogen, and oxygen. In a sample containing a mixutre of only these gases at exactly one atmosphere pressure, the partial pressure of carbon dixoide and nitrogen are given as Pco2 = 0.285torr and

    asked on March 25, 2009
  9. Math

    The Sugar Sweet Company is going to transport its sugar to market. It will cost 4375 to rent trucks, and it will cost an additional 175 for each ton of sugar transported. Let c represent the total cost (in dollars), and let s represent the amount of sugar

    asked on September 10, 2009
  10. not really school related.

    Okay, I got accepeted for a part time job at school, and the letter says that I should bring a resume. I never had a job before, so how would I bring a resume, but it seems really bad for me not to bring something.

    asked on April 13, 2009
  11. Virus :P

    A virus spreads in a small town. What should first do to find a vaccine for the virus? I narrow it down to "Idenify the Virs" and "Idenify the host of the virus" I say identify the host of the virus first.

    asked on April 1, 2009
  12. Chem Check

    Can someone verify my answers please? convert the folowing into a pressure reading expressed in torr A. 1.25atm * 760torr/1.0atm = 950. torr B. 2.48 x 10^-3 atm * 760torr/1.0atm = 1.88 torr C. 4.75 x 10^4 atm* 760torr/1.0atm = 3.61 x 10^7 torr D. 7.60 x

    asked on March 17, 2009
  13. Chemistry help please!

    For each product of the following unbalanced equations which reactant is limiting, and calculate the mass of each product that is expected. 1) 2Al + 6HCL --> 2AlCl2 + 3H2 15.0gAl * 1moleAl/26.981gAl * 2moleAlCl3/2moleAl * 133.34gAlCl3/1moleAlCl3=

    asked on March 6, 2009
  14. Math Course

    I was thinking about math courses for next year, and I do not know what I'm going to take. What is the differences between Alg 3 and Advanced math? And also, and does Trig involve? And I'm too scared of calculus to take it.

    asked on February 27, 2009
  15. Chemistry

    2C2H2 + 5O2 --> 4CO2 + 2H20 How many grams of CO2 is produced when 2.50 x 10^4gC2H2 burns completely 2.50 x 10^4gC2H2 * 44.009gCO2/26.038gC2H2 = 4.23x10^4gCO2? or am i wrong

    asked on February 26, 2009
  16. Chemistry+Singe replacement

    Balance the following equations if the reactions will occur. gold + oxygen Au + O2 --> ??????? barium + oxygen Ba + O2 --> ??? bismuth + oxygen --> Bi + O2 --> ??? help please. keep in mind this is single replacement

    asked on February 9, 2009
  17. chemistry

    Nitric Acid + Calcium hydroxide ---> calcium nitrate + water I wrote it as : NO3 + Ca(OH)2 ---> Ca(NO3)2 + H20 Did I write it correctly? Where should I put my charges? I also have big time trouble balancing this one.

    asked on February 4, 2009
  18. Chemistry

    WAter amd nitrous oside are produced by heating ammonium nitrate NH4NO3 >>>> NO + H2O is that right?

    asked on February 4, 2009
  19. Chemistry+last post

    can someone reply to my last post?

    asked on February 3, 2009
  20. Chemistry+Balancing equations

    Aqueous magnesium hydroxide has been used for many uears because it reacts with HCL to produce magnesium chloride So far I got Mg(pos. 2 charge)OH2(-1 charge) + HCL >>>>>>> Mg(+2 charge)Cl2(-1 charge) + H2O did i get that rite?

    asked on February 3, 2009
  21. Chemistry+Balancing Equation

    Solid phosphorus trichloride is produced by reacting solid phosphorus and chlorine gas. 2P + 3Cl2 -----> 2PCl3 is that right?

    asked on February 3, 2009
  22. DrBob+Thanks!

    Drbob, your explanation is very clear and I learned alot out of it. I also have one last question to ask you. I posted it at my last post.

    asked on January 29, 2009
  23. alg 2+urgent please.

    2/the 6th root of 81 the answer gave an answer of "2 3rd root of 3/3" sorry i didn't type the root signs, i dunno how. can you show me how to work this?

    asked on January 26, 2009
  24. Chemistry+empirical formula

    What is the empirical forumla (lowest whole ratio) of the compounds below? A. 13.0g Mg 1 mole/24.312 = .53 mole 87.0g Br 1 mole/79.909g = 1.09 mole Mg .53/.53 Br 1.09/.53 Mg 1.0 Br 2.1 What do i do now?

    asked on January 15, 2009
  25. Chemistry+Percentage

    Calculate the percentage of water in each of the following hydrates. Aluminum bromide hexahydrate I just need help setting this up. I can work it from there Would it be: AlBr * 6H2O Did I write it right?

    asked on January 14, 2009
  26. math

    A theater group made appearances in two cities. The hotel charges before tax in the second city were 1500 lower than in the first. The tax on the hotel bill was 5.5% in the first city and 10% in the second. After the trip, the total tax paid on

    asked on September 17, 2009
  27. Math

    Find two numbers whose sum is 50 and whose difference is 6. So I'm going to set up a system of equation. x + y = 50 x - y = 6 And I got x = 28 y = 22 Correct?

    asked on September 17, 2009
  28. Math

    Give an ordered pair (a,b) of numbers that satisfy the equation. I got (1,1) but cant i also be (2,4)? I'm not sure how to answer that Also, Write each equation for the vertical and horizontal lines passing through the point (7,-5) in (x,y) - coordinates I

    asked on September 10, 2009
  29. Alg III AGAIN :)

    This one is hard. 5 - |3-2x|/3 = 4 How do I begin to do this? -|3-2x|/3 = -1 -|9-6x| = -3 or -|9-6x} = 3 ????

    asked on August 20, 2009
  30. Alg III

    Solve each absolute value equation. 3 + |x| = 5 My work: 3 + x = 5 or 3 + x = -5 x = 2 or x = -8 The book says that I am wrong. I do not know why.

    asked on August 20, 2009
  31. Alg III

    Solve each absolute value equation. |x - 3| = 1 Okay here is what I did: x - 3 = 1 x = 4 or x = -4 The book says {2,4} I'm very lost. Can someone help me?

    asked on August 20, 2009
  32. Delta T

    In the delta T formula how do you find i = ? If its ionic like NaCl then i = 2 What if its like C6H12O6? i = 1 ? or i = 3? Since that is not ionic i would assume it will be 1

    asked on May 4, 2009
  33. Chemistry

    Water had the lowest bp of 100C b/c it has no solute to block the movement which cause to have a lower bp when heated. Water with a solute of sugar has a slightly higher bp of 101C because it has a solute o block off some of the waters movement to the top.

    asked on April 30, 2009
  34. Chem

    Why does H2O + Sugar have a higher boiling point than Water? I said that H20 + Sugar has a solute of sugar which absorbs some of the heat when boiled. Is that correct?

    asked on April 29, 2009
  35. DrBob22

    Can you check my answer in the last boiling point topic I posted? Thanks.

    asked on April 29, 2009
  36. Boiling point (DrBob)

    If you add 2g of NaCl to 23mL of water, what is the boiling point? . 2 g/molar mass Salt = 58.4425 mole of salt delta T = Kb*m delta T = 0.512 x 0.23 = 0.113 or about 113 C. I tried to model this problem like you did, but I don't know if I did it

    asked on April 29, 2009
  37. Boiling point

    You add 2g of sugar into 23mL of water. Estimate the boiling point. I would say its above 100 since waters boiling point is 100. So maybe 120?

    asked on April 29, 2009
  38. Hyperbolas

    x^2/16 - (y^2+4) = 1 Vertices: (4,-4)(-4,-4) Foci: (4.1,1)(-4.1,1) am i right?

    asked on April 28, 2009
  39. Hyperbolas

    Does anyone know the formula to form the "Asymptote square"? It was something our teacher showed us to help us graph your hyperbolas easier.

    asked on April 28, 2009
  40. English+Grammar

    Is this sentence correct? This sentence makes no sense at all. I ate a grape and went to the mall. or would it be I ate a grape, and went to the mall. Or is it both?

    asked on April 17, 2009
  41. Proof reading

    Hello, my research paper is due Friday, and I am done with it. I need someone to proof read it and I was wondering anyone is willing to proof read 6-7 pages of text. I know that's alot to ask for, but I need a good grade on this. Is there anyone available

    asked on April 15, 2009
  42. Resume

    I have no idea what to put under my experience section of my resume? Should I just exclude it from the resume? I have no working experience :P

    asked on April 14, 2009
  43. Robert Frost

    What did Robert Frost write about in his poetry? I think he wrote about the common people of America.

    asked on April 8, 2009
  44. Speed Reading

    Does anyone here speed read? I can do a little bit, but I can comprehend what I read too well when I try to speed read. All I can do is read the words then forget everything. Any tips? Or is that the negative thing about speed reading?

    asked on April 5, 2009

    Hello, I took my ACT test today, and I think I epicly failed the english part. The part where you had to correct the underlined sentence was really hard. I would narrow it down to 2 answers, but obviously only one can work. Both of them looked correct to

    asked on April 4, 2009
  46. Rationing

    Compare the rationing in WWII to how we have been affected by the wars in Afghanistan and Iraq. How would Americans today react to a government rationing program? Choose 3 of the items you read about that were rationed during WWII and explain whether or

    asked on April 3, 2009
  47. Science help

    India : Duck Australia : Duck South Africa : Duck, Goose Africa : Duck Cat Antarctica: Duck Goose cat If scientist wanted to argue that South Africa, Africa, and Antarctica was once connected, which animals would they use to determine that? Would it be

    asked on April 1, 2009
  48. science

    India : Duck Australia : Duck South Africa : Duck, Goose Africa : Duck Cat Antarctica: Duck Goose If scientist wanted to argue that South Africa, Africa, and Antarctica was once connected, which animals would they use to determine that? Would it be just

    asked on April 1, 2009
  49. Virus

    Can a virus attach to your cells and steal nutrients from it? Answer: Yes. Can a virus attach to your cell and burst it by filling it up with water? Answer: No Correct?

    asked on April 1, 2009
  50. Science

    Say that an airplane is traveling at 800mph. A woman walks from the back of that plane to the front at 3mph. How fast is that woman actually walking? Is she still walking 3mph? or 800+3= 803mph? I keep wanting to say its 3mph

    asked on April 1, 2009
  51. Sra

    Is it true that in France, people get paid to make the language sound more pretty. My teacher told me that people get paid over there to make up words that sound pretty and enforce it.

    asked on March 31, 2009
  52. French

    How do you say You must put on your seatbelt? ans: Vous faut mettre sur votre ceinture de securite You must use your signal to turn ans: vous faut utiliser votre clignotant avant de tourner You must not use your phone while driving ans: Vous ne faut pas

    asked on March 31, 2009
  53. Sra

    Are you going to be on for a lil bit more? Around 1-2 hours now from this post? I really need help with some french, but I have to do some other homework first. I'll check on your reply in a bit. Merci beacoupe.

    asked on March 30, 2009
  54. Dr.Bob22

    Can you please verify the anwer I gave robb under his chemistry post called "mass-mass". I probably did something wrong.

    asked on March 30, 2009
  55. Sleeping.

    Is sleeping a waste of time? Now that I think about it, sleeping seems like a waste of time.

    asked on March 29, 2009
  56. Logging in.

    What is the purpose of the login function on this website? You can always change your name to whatever you want, so why even have it there?

    asked on March 29, 2009
  57. DrBob22

    We have never learned the formula (P1V1/T1) = (P2V2/T2) Is that the same thing as P1V1T2=P2V2T1 ??

    asked on March 25, 2009
  58. Final thought+Suggestion

    Okay, I recently made a post about converting the homework help section into a homework help forum. I have heard that many tutors have suggested this but there were some problems that occurred. What do you guys think? I want to here opinions from all the

    asked on March 23, 2009
  59. Suggestion to Website

    I was just wondering if it was a good idea to convert this part of the website into a homework forum? It would be alot more organized that way because everything would be under sections and stuff. People can also distinquish between tutors and students as

    asked on March 23, 2009
  60. FDR+OBama

    Do you see any similarities between FDR and Obama as leaders? What about similarities between the economic challenges faced then and now? Compare and contrast the two presidents and their responses to economic issues during their administrations. Well, I

    asked on March 22, 2009
  61. Chemistry Lab+Help

    Okay, basically what we did in the lab was fill up an empty soda can with about 5mL of water, and we had to heat it up to a boiling point. After that we turned the soda can upside down into a beaker with cold water. After a minute or so, the can just

    asked on March 22, 2009
  62. Stainless Steel

    How sharp is stainless steel? Can someone give me a comparsion to how sharp stain steel is? are they as sharped as kitchen knives? or how about samurai swords?

    asked on March 14, 2009
  63. Great Depression

    Can someone find me sources for Involvement Cause of the great depression. I found some but they are not enough.

    asked on March 13, 2009
  64. The Great Depression

    I'm doing a report on the great depression and I need some reliable source about politcal issues or anything politcal that occurred during the great depression. My teacher made us use note cards to write these information down. Any help would be greatly

    asked on March 12, 2009
  65. Log

    Expand Log5(5squareroot x/7) the first 5 is a base how would you expand that?

    asked on March 12, 2009
  66. Math+Growth/Decay

    3e^2x = G -3e^2x = G -3e^-2x = D 1/8e^2x = G -1/8e^-2x = D Would that be correct? I just made these examples up in my head. How can you tell if its growth or decay? I just look at the exponents. If is a negative then its decay? if its positive then its

    asked on March 11, 2009
  67. DrBob

    Can you reply to my last post on chemistry? thanks alot.

    asked on March 4, 2009
  68. log

    How do you solve 6log2x = 13 I got log2x^5 = 13 but I don't know what to do next. Would it be 2x^5 = 13^2 HELP. Thanks.

    asked on March 4, 2009
  69. Reiny

    Can you check back at my last post again? Thanks.

    asked on March 2, 2009
  70. Reiny+ In need of help

    Hey Reiny, could you please take a look at my expo growth and decay post? Thanks alot.

    asked on March 2, 2009
  71. Exp. Growth + Decay (HELP ME PLEASE!)

    1. Suppose you invest $1,000 in a CD that is compounded continuosly at the rate of 5% annually. What is the value of this investment after one year? two years? five years? A=1000(e^(.5x1)) = 1648.72 A=1000(e^(.5x2)) = 2718.28 A=1000(e^(.5x5)) = 12182.49 2.

    asked on March 1, 2009
  72. Confused.

    Okay, I'm going to register for the ACT, on their website it says Registration Deadline: February 27, 2009 Does that mean starting tomorrow, I'll be late? Or tommorrow will be the last day to register?

    asked on February 26, 2009
  73. Research paper

    If I did research paper on the Great Depression, would that topic be too board?

    asked on February 24, 2009
  74. Math+graphing Log

    how would i graph log3x the 3 is subscripted? I remember that I had to make an X and Y chart and list the Domain and Range

    asked on February 23, 2009
  75. Reiny+Damon

    Can you reply to my last math+log post =) thanks. I'm going to be having alot of math questions today.

    asked on February 23, 2009
  76. Math+Log

    Simplify the expression: The first 7 is regular size and the log7x are small (the second 7 is subscripted only). 7log7x = would the answer be 1? How do you work this?

    asked on February 23, 2009
  77. Ms. Sue

    Can you reply to my french post. I think your able to help me with it.

    asked on February 22, 2009
  78. FRENCH 2-TEST!

    AHH! I just remember about my french test tomorrow on qui and que. How do you know when to use which? HELP!

    asked on February 22, 2009
  79. Solving system of linear equations

    I already know the 3 methods of doing it, but I recently found out about using matrices to solve it. How exactly do you do that? All I can remember is something with rref on my calculator.

    asked on February 22, 2009
  80. Ms. Sue - ACT Test

    I was wondering if you had any experiences with the english part of the ACT test. About 3 hours ago, I took a pratice test on the english part of it, and got like 20/35. That's like 57% right. I want to know how to tackle those sections where they have a

    asked on February 22, 2009
  81. Mahatma Ghandi

    I have a question on Ghandi. Okay, my brother's 3rd grade teacher assigned him to do some kind of project on Ghandi for Black History month... Is Ghandi even black?

    asked on February 20, 2009
  82. Song of Myself+English

    Has anyone read Song of Myself by Walt Whitman?? I can't find any themes for it. So hard to understand. Would slavery be a theme? I need atleast 4 themes associated with Song of Myself.

    asked on February 19, 2009
  83. Chemistry+balancing equation tips

    We are on combustion reaction at the moment in chemistry, and I have to say, these reactions are like extremely hard to balance(well, just alot of erasing). It takes me a while to balance combustion reactions and I want to know if theres any tips in

    asked on February 19, 2009
  84. EW! GRAMMAR!

    Can someone help me find GOOD pratice tests for Prepositional phrases, Participial phrases, gerunds phrases, infinitive, appositive, adjective phrase, adverb phrases, main clause, subordinate clause, complex clause and compound complex clause Thanks!

    asked on February 17, 2009
  85. Alg

    (2x/2x) + 1 == 1?

    asked on February 14, 2009
  86. chem

    is iron (III) carbonate a solid or (aq)?

    asked on February 11, 2009
  87. history ish

    The U.S is the only country currently not using the metric system as its primary system of measurement. Imagine uou have been appointed to the Board in the US Trade and Commerce department that is trying to rewrite the metric conversion act of 1975 in

    asked on February 10, 2009
  88. Alg2

    Rationalize the demoninator of each expression. (9y/x)^4 i have no idea how to do that

    asked on February 9, 2009
  89. DrBob

    Can you reply to my last post? thank you.

    asked on February 5, 2009
  90. Chemistry

    Can someone tell me when I add charges to my balancing equations? I know that you add charges when dealing ionic compounds (metal and nonmental), but what else? Acid?

    asked on February 4, 2009
  91. reply+chemistry please

    can someone reply to my last chem post

    asked on February 4, 2009
  92. Chemistry

    Hydrogen sulfide burns in the presense of oxygen producing sulfiar dioxide and water I got HS + O2 >>> SO2 + H2O Its not balanced yet, but can you check if i wrote the equation right? Does the hydrogen sulfide need charges added to them?

    asked on February 4, 2009
  93. Reiny

    Can u answer my last alg post?

    asked on February 2, 2009
  94. Alg 2

    X^1/3 - 2/5 = 0 x^1/3 = 2/3 x= 2/3^(1/3) x=1.38 is that right? Also (x-4)^3/2 = -6 How do you do that?

    asked on February 2, 2009
  95. accounting

    Anzlyzing financial statement effects of accounting for bad debits using the allownace method. Duffy Bros. uses the allowance method to account for bad debets expense. Duffy experienced the following four events in 2008: 1.Recognition of 64,000 of service

    asked on February 1, 2009
  96. Accounting!

    Do we have any accounting tutors here?

    asked on February 1, 2009
  97. Chemistry

    When burning a Magnesium Ribbon, would the color (the white dust) that it changed to be a chemical change? Or how about the spark it makes (I am just in basic chemistry, so that spark might be counted as a chemical change)? So far I got from the help for

    asked on January 29, 2009
  98. Last chemistry post

    Can someone please reply to my previous post about chemistry preferable DrBob since he was helping me on it, but anyone is fine.

    asked on January 29, 2009
  99. Chemistry

    I was doing a lab today in chemistry, and I do not know if I got my measurements correctly. My teacher gave us a strip (probably 5inches) of Mg. We measured it, and then after that, we had to burn it, and measure the mass of it after it was burn. Would the

    asked on January 29, 2009
  100. Chemistry Conversions

    Convert to Mass Convert to Mass: .000523 moles of C6H12O6 if figure that out, would i have to add up the molar mass of C x 6, H x 12 and O x 6 ? then us the total mass of that over moles to find out?

    asked on January 27, 2009


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