chem

307 results
  1. Advice...about chemistry degree Dr.Bob

    Based on the question topic posted by Britney below titled:In your opinion (your answer to this reminded me of something) (I posted the same thing there but I thought it was improper to piggyback on that post so I posted this under a new topic) I don't
  2. chemistry

    can you please give me some practical applications of qualitative chem and quantitative chem...
  3. chem

    so i posted this question yesturday and got some help. which is the stuff below. can you look at the last thing i said which was the answer i got by doing what DrBob222 said to do and tell me if its correct.(the question is the first section) thanks chem -
  4. I have a question concerning Spring Semester

    Im a freshman in college and I just took Chem1, Trig, and Drama (12units). I am planning on taking Chem2, Pre-Calc, and Art1 for spring sem. (13units). I'm not sure if this is too much to take for next semester considering two five unit classes or should I
  5. Chem- bobpursley

    What mass of protons would be required to just neutralize the charge of 1.5 g of electrons? my teacher said .0015kg times 1e-/.00091e-27kg times 1pt/1e- times 1.67262e-27 over 1 p chem - bobpursley, Tuesday, September 21, 2010 at 6:48pm That is what I
  6. Chemistry

    Ok, so in my gen chem 1 class, the teacher showed us that ethanol would not dissolve a sugar cube while water dissolves a sugar cube easily. No explanation was given, she just told us we would find out in gen chem 2. Here i am in gen chem 2, and the same
  7. organic chemistry

    whats the difference between inorganic chem and organic chem? im really confuse because mrs. white told us inoraganic is about ionic bonds while organic is about covalent bond. what is the difference between the twooo? please help me
  8. 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
  9. AP Exams?

    I am in AP Chemistry and AP U.S Hisotry and I have planned on taking the tests. So far I have made an A+ in APUSH, but I an B in AP Chem. I've done kinda bad on the tests I've taken in there and I don't think I will do good on the Ap exam. I think I have a
  10. chem- drbob222 please help

    my original question was: how do i figure this out?? How much heat does your body lose when 2.46 g of sweat evaporates from your skin at 25°C? chem - DrBob222, Tuesday, February 22, 2011 at 10:52pm q = mass water x delta Hvaporization. chem - Rebekah,
  11. Math

    in a class of 60 students 30 like maths 25 like physics 30 like chemistry. if 10 like both physics and maths 5 like maths and chem and 5 like phy & chem and 3 like all the subjects. find student like none of subject of if 100 students were surveyed
  12. Math

    in a class of 60 students 30 like maths 25 like physics 30 like chemistry. if 10 like both physics and maths 5 like maths and chem and 5 like phy & chem and 3 like all the subjects. find student like none of subject if 100 students were surveyed
  13. Lab in general

    I just read my syllabus for lab and I am kind of shocked at what it says. I do know that I have to write out procedures of the lab in my nbk before coming to lab but I just read that it says "You will NOT be allowed to refer to you textbook/handout during
  14. chem - br bob is this right

    What is the pH of a solution prepared by adding 4.000 grams of NaOH to a 50.00 mL of a buffer that is 2.00 molar both in acetic acid and sodium acetate? (Assume final volume is still 50.00 mL) * chem - DrBob222, Wednesday, April 21, 2010 at 10:52pm * chem
  15. chem-repost

    I ddin't know if anybody would look far down to page to help me answer my question but this is what was said so far. Posted by rebekah on Sunday, October 24, 2010 at 4:48pm. Give the general formula for any dialkene; that is, a straight-chain hydrocarbon
  16. for: drwls -Dr.Russ

    Is there a 'Dr.Russ' that can help with Organic Chem?
  17. Thank you Dr.Bob222

    Thank you, you don't know how much you have help me with my chem class...thank you so much..your the best!!
  18. Chemistry

    Is DrBob222 available tonight? Please let me know, I need some chem help.
  19. reply+chemistry please

    can someone reply to my last chem post
  20. Chemistry

    What is the thermal stability of potassium phosphate and why? Thanks. I assume you mean as a powder, not as an water solution. Potassium phosphate is deliquescent. At elevated temperatures, phosphorus oxides are released as the compound decomposes. How
  21. 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
  22. K => I answered your question at bottom or next pg

    I helped the best I could on your organic chem question
  23. physics vs. Chem

    Doesnt physics seem to be harder than chem? Anyone?
  24. science

    help with the chem lab. the molecular of a volatile liquid.
  25. Dr. Bob

    Dr. Bob, can you please tell me if I did my chem questions right... they have been sitting down there all day and all i need is someone to check if they are right please and thank you
  26. Chemistry

    AP Chem - Which element is oxidized in the following reaction: CuO(s) + H2 (g)  Cu(s) + H2O (l)
  27. chem

    what are the other practical applications of Analytcal chem on being a medical technologist?
  28. all

    anyone have some good tips on how to study for bio phys and chem
  29. sand bath (chem)

    what are disadvantages and advantages of using a sand bath to heat something in chem?
  30. science

    Dr bob, can you check my reply to chem question from andy thanx
  31. Chemisty

    How many grams of Cl are in 38.0g of CF2Cl2? I really want to figure out how to do it. I can't seem to understand any of this Chem homework and it's getting me frustrated, please help!
  32. chemistry

    Thank you Dr.Bob for your speedy reply-I also tutor in other subjects, but chem. is my nemesis.
  33. Math

    Can someone tell me whether an enthalpy diagram has 2 axes? Now i know it has 2 but suddenly i'm not very sure because i dunno what they are!! so can anyone help me? i suck at chem!
  34. pre-calculus

    2y^-3 = 4e^(-x/2)/(1+e(-x/2)) my teacher gave this problem in my chem class and i don't know what he is really asking , does any one have an idea if i have to solve for y or what's going on.. how would this be done..
  35. Chemistry

    45.0 ml of 9.0x10 the negative 2m hno3 I am needing the steps to help solve the above chem equation
  36. chemistry

    Hi I am in AP Chemistry and I did not take regulars chem so I have never done labs before and was wondering If anyone could give me examples on how to do a lab
  37. algebra

    2y^-3 = 4e^(-x/2)/(1+e(-x/2)) my teacher gave this problem in my chem class and i don't know what he is really asking , does any one have an idea if i have to solve for y or what's going on..
  38. Chemistry (repost)

    Which of the following pairs of substances, when mixed in any proportion you wish, can be used to prepare a buffer solution? 1)NaCN and NaOH 2) HCl and NaOH 3) HCN and NaOH 4)HCl and NaCN 5) NaCN and HCN is the answer 1 and 5?? chem - DrBob222, Sunday,
  39. Chemistry

    What would happen if too much refrigerent was present in the system(refrigerator)? Too little? HELP!!! I'm doing a C^3 assignment for chem and its due tomorrow can someone help me please!
  40. Chemistry

    What would happen if too much refrigerent was present in the system(refrigerator)? Too little? HELP!!! I'm doing a C^3 assignment for chem and its due tomorrow can someone help me please!
  41. Chemistry

    What would happen if too much refrigerent was present in the system(refrigerator)? Too little? HELP!!! I'm doing a C^3 assignment for chem and its due tomorrow can someone help me please!
  42. Mimi

    post your thinking, or what is confusing to you on your chem/physics questions. I am not much of an answer giver. I do critique well.
  43. Dr Bobb

    where u from r u chem proff... where do u teach .. i like the way u answers u r really gud thnks for ur help bye may God bless u
  44. Chemistry

    Help :) I got this Chem homework to research on the Taxonomy of Living Things and on the species to kingdom. Anyone can help where I can find this? :) Thank you
  45. Identify the substance

    There was a substance I used in a lab for chem class and I`m not too sure what it was. They were tiny white balls about a millimeter in diameter. What would they be?
  46. 10th Grade Chemistry

    I struggle in the sciences and was wondering what I could do over the summer self studying wise to prepare for 10th grade chem?
  47. CHEM

    A particular coal contains 2.55% sulfur by mass. When the coal is burned, it produces SO2 emissions which combine with rainwater to produce sulfuric acid. Determine how much sulfuric acid (in metric tons) is produced by the combustion of 1.1 metric ton of
  48. Chem

    This is a lab concerning activity serious of metals and calculation of electrode portentions... Complete the following: if there is NO reaction write NR: (They provided the reactants, my answer is the products) Iron(s) + copper sulfate(aq) → iron
  49. Chemistry

    AP Chem ---- Which type of radiation is emitted when chromium 51 decays into manganese 51? Show the nuclear equation that explains it.
  50. Who is correct? (chemistry issues here)

    how can this person say that I googled info? (I created it randomly out of my head) and be so ungrateful that I spent the time out of my day to help? Or is it I don't know what I'm talking about and a "condensed structure" is not the answer to the homework
  51. Chemistry

    Does helium have an ionic radius? I searched and looked in an old Chem book, and come up empty. Hydrogen is not listed either. Is there a specific reason for this? Thank you.
  52. chemistry

    Hi, Does anybody know any good websites that can teach me step-by-step basic chemistry (through power points) to AP chemistry? I would greatly appreciate it! Since this is not my area of expertise, I searched Google under the key words "AP chemistry
  53. chemistry

    A quick chem question reguarding acids and bases: The questions says: "a very strong acid has a very weak base. Critique this statement."
  54. Chemistry

    Okay so I'm doing doing significant figures in chem. And I was just wondering for problems like this: .000456 dm + .00524 m Do I have to actually convert stuff? And on the ones with exponents what do I do ? Ex: 3845.2 m cubed/ 25.2354 m
  55. chemitsry

    The directions say for each of the following use appropriate chem properties to explain the following observations. What would be observed on the surface of zinc and silver if they are placed in separate solutions of copper (II) sulfate? I am not really
  56. Chemistry

    AP Chem --- PbS + O2 = PbO + SO2 Balance the equation and write a short paragraph explaining the electron transfers that happen.
  57. AP Chemistry

    Hey I have the AP Chem test coming up and i was wondering where I could find the answer key to some of the AP Chemistry tests like 1994, 1999, and 2002 MC and FR
  58. Chemisty

    (I am a mom trying to help my child had Chem years ago if I can see how this is doNE I can explain it to them) You have 70.0mL of a .400M stock solution that must be diluted to .100M. How much water should I add?
  59. Kinetics

    I'm really struggling to understand this chapter in chem class, partly due to an inadequate math background. does anyone have any tips for learning kinetics? i'm starting to fall behind.
  60. Medical Terminology

    The combining form chem/o is used to form the word chemotherapy because therapy begins with a ____________?
  61. Dr.Bob222 Chem

    I believe that you are correct because you have more experience in G-chem then I have. But how does doubling the reaction rate double the k value? Isn't k just a constant for a particular reaction?
  62. Chemistry labs in highschool

    I was curious to know whether it was standardized practice to have labs for chemistry classes in highschool. I personally have never had labs for chemistry in highschool. In my state we have the Regents. You may or may not have heard of this test, but the
  63. Gen Chem II

    Thanks for the information Dr. Bob. Would you be able to work it out so that I can actually see the steps with the numbers and follow from there. The question was on Vitamin K from Sunday at 2:44pm which you answered at 3:45pm. Thanks again. I am looking
  64. chemistry

    can someone explain the leveling effect in chemistry or provide a good link please? in my chem book it says something like HNO3
  65. Conversion

    After finishing a Chem problem, I arrived at a answer of 176764.8987 M. How would I convert that to uM/L (micromolar) If M is molar, your number is quite unrealistic. Multipy Molarity by one million to get micromoles per liter.
  66. College science

    Im in Chem. but looks like physics.. If a rock climber accidentally drops a 70.5 g piton from a height of 295 meters, what would its speed be just before striking the ground? Ignore the effects of air resistance.
  67. NURSING ASAP

    Is nursing considered a a science major because I'm taking this course called "CHEM 1001 Chemistry and the World Around Us?" and I studying nursing in college. Please be honest. Thank you! :)
  68. chem

    if a car produces 81g of {\rm CO_2}, how many grams of {\rm O_2} are used up in the reaction? the complete chem reaction is C2H6O+3O2--->2CO2+3H2O
  69. chem9th

    okay i have 6 things 2 look 4 to c if a chem reaction 'goes' they r -ppt -color change -change in heat -gas released -light given off -water formes what is the 7th 1?
  70. science

    What is the equation of the hydrolysis of lactose? http://www.rpi.edu/dept/chem-eng/Biotech-Environ/IMMOB/lactose.html
  71. Chem - DrBob222 & drwls

    Just want to say thanks to you guys for the help you gave me during the last couple of months. It was all in preparation for the National Chemistry Test and I just received word I have been selected to be in the running for the National Chem Team. Thanks
  72. chem

    What is another name for cardamist? Please write the formula and a link to its structure. See http://antoine.frostburg.edu/chem/senese/101/consumer/faq/what-is-cardamist.shtml
  73. chemistry

    Does anybody know any websites that there are chemistry labs that could possibly be used in a CSI investigation? I can’t find anything. http://antoine.frostburg.edu/chem/senese/101/organic/faq/amino-acid-test.shtml
  74. Chemistry

    Can someone please check to see if I balanced this chem. equation which is an incomplete combustion reaction: 2C3H8 + 11O2 ->> 3CO2 + 4H2O +2CO +C(s) My answer: 7C3H8 +22O2 -->> 6CO2 + 28H2O +4CO +11C Thanks!
  75. AP CHEM

    A secondary alcohol results from the attachment of a hydroxy group to which carbon atom? C |
  76. Chemistry

    Are propane, methoxymethane, and ethanol soluble in water? yes http://www.chem.lsu.edu/lucid/tutorials/solubility/Solubility.html Henry is wrong.
  77. Chem Help!

    I really need help with this question for my chem H.W. 1) On a summer day in Breckenridge, Colorado, the atmospheric pressure is 525 mm Hg. What is this air pressure in atmospheres? (round to the hundredths place) atm
  78. science help chemisry

    I am doing my study guide for chem test - I cant find a good understadable answer for these 3 1. What is your definition of electrolysis? 2. How do you separate pure substances? 3. My book says mayonnaise is homogenous; teacher told the class it was
  79. science

    asprin (C9 H8 O4) is produced by the rection between salicylic acid (C7 H6 O3) and acetic anhydride(C4 H6 O3). Calculate the maximum mass of aspirin that can be obtained if you mix 50g of each of the reactants. The chem.equation for the reaction is as f.f
  80. chemistry please help

    am doing my study guide for chem test - I cant find a good understadable answer for these 3 1. What is your definition of electrolysis? 2. How do you separate pure substances? 3. My book says mayonnaise is homogenous; teacher told the class it was
  81. experimental design

    I want to prove a thesis i have, it think my school has an experimental design class, but i cant take it because my schedule is full, but how would i go about proving my thesis? writing a paper? lab report? we never really learned this in bio or chem
  82. chemistry 1 help please!

    Write a chemical equation that shows how acid rain H2SO3 was produced from SO2 gas and water in a zip sealed bag? My chem. teacher never explained how to do this and I have several other questions on this type of subject. If you could help me out it would
  83. Chem 1

    Write a chemical equation that shows how acid rain H2SO3 was produced from SO2 gas and water in a zip sealed bag? My chem. teacher never explained how to do this and I have several other questions on this type of subject. If you could help me out it would
  84. First Year Chemistry

    I have a question that I don't understand from my first year chem lab. Calculate the minimum volume of water needed to decompose all the excess Ethanoic Anhydride. Recall: 1.0g of H2O = 1.0 ml of water. How do I go about doing this?
  85. Chemistry

    12. In a calorimeter, 10 g of ice absorbs heat with an enthalpy of fusion of 334 J/g. What is the heat absorbed? q = mCHf I am having a lot of trouble on this type of problem in chem. Help and an explanation would be greatly appreciated. Thank you.
  86. AP Chemistry

    So... this is the question which is from AP chem 2006 past paper. Suppose that a stable element with atomic number 119, symbol Q, has been discovered. a) write down the ground-state electron configuration of Q, showing only the valence-shell electrons.
  87. Chemistry

    I am filling out a chem packet. Is what graphite, diamond and fullerene have in common is that they're all made of carbon? My other problem is what are four alternative uses to copper for... 1)electrical wire 2)generators Are copper's two alloys calcolite
  88. Biology (Science)

    Why is water a polar molecule? Please read: (Broken Link Removed) AND http://ghs.gresham.k12.or.us/science/ps/sci/ibbio/chem/notes/chpt2/polar.htm
  89. chemistry

    Why must a calculated answear generally be rounded? and how many siginificant figures must you round an answear to when performing multiplication or division? http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch1/sigfigs.html
  90. CHEM (DrBob222)

    I had posted the question to that previous chem question, regarding Mo & V...they said that it should have been correct. What I am thinking that I was missing...must have been that I did not include 4s & then just not fill it. I had excluded it from my
  91. Chemistry

    Write a balanced Chem. Eq 1. Chlorine gas will react with aqueous sodium fluoride if 200J of energy is added and manganese is used as a catalyst. 2. Dinitrogen pentaoxide gas decomposes into its elemental parts.
  92. chemistry

    so we did a chem lab and one of the questions is to tabulate the amount of S2O3 consumed in moles and times (sec) for each run. I'm just not sure how to calculate the amount consumed. Can someone please explain how?
  93. Chemu

    Hi! I need help with my Chem homework. "When acetylene, C2H2, burns, how many liters of O2 at STp are used for every mole of acetylene burned?" (Balanced equation: 2 C2H2 + 5 O2 --> 4 CO2 + 2 H2O)
  94. Chemistry

    I was reviewing chem equations online. This one site said this is a balanced equation. I don't see why there are 13 oxygens! thirteen times two would equal 26, and there aren't 26 oxygens on the other side. Who's correct and why? Thank you for your help.
  95. Chem

    What causes dispersion forces? Disperson forces are caused by an unsymettrical distribution of charge in the molecule, causing a net electric force. http://www.chem.purdue.edu/gchelp/liquids/disperse.html
  96. Chemistry

    OMG i'm soo screw for chem.. >_ Mn^2+ + CO2 K2S3O6 + KClO + KOH --> K2SO4 + KCL + H2O
  97. Chemistry

    I am currenty working on my AP Chem Summer Project, but I need a little help. Which of the following are pure substances, and which are homogeneous mixtures? a) sugar dissolved in water; b) tea and ice; c) french onion soup; d)mud; e) gasoline; f) carbon
  98. chem equations

    could someone tell me how i could solve this chem equation CH4 + NH3 +O2...> HCN +H20 AND USE THE LOWEST WHOLE NUMBER COEFFICIENT i WOULD BE GRATEFUL FOR ANY POINTERS Try these coefficients. 2,2,3==>2,6 Hi bex heres a little more help for you. Answer is
  99. Chemistry

    For which of the following aqueous salts will electrolysis produce hydrogen gas and oxygen gas? Answered the hint in Mastering Chem & looked over the book and I still have no idea. Check all that apply: A) NiF_2(aq) B) NaF(aq) C) NiI_2(aq) D) NaI(aq) E)
  100. Science

    What is the structural formulae for the equation for the hydrolysis of lactose? It is impossible for us to draw structures on the computer. Here is a web site that may help you. http://www.rpi.edu/dept/chem-eng/Biotech-Environ/IMMOB/lactose.html

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