Chemistry - October 2007

1. what is organic chemistry?
2. is it good or bad? Why?

that's all. I have to write a paper and I am still not sure what organic chemistry is and whether it is good or bad.

your help is appreciated.

2007-10-28 05:59:11 · 2 answers · asked by greenpink413 2

Assume that we are in another universe with different physical laws. Electrons in this universe are described by 4 quantum numbers with similar meanings to the ones we use. We call them a,b,c and d. The rules are: a=1,2,3,4,5 ...
b takes on positive odd integers and b is less than or equal to a.
c takes on all even integer values from -b to +b and zero is considered even.
1) sketch what the 1st four periods of the periodic table will look like in this universe.

2007-10-28 05:46:36 · 1 answers · asked by Anonymous

ten times

one hundred times

or

one thousand times

2007-10-28 04:59:02 · 4 answers · asked by Anonymous

2007-10-28 04:55:57 · 2 answers · asked by !molly! 1

What is Hrxn for the reverse reaction of

1/8 S8(s) + H2(g) H2S(g) Hrxn = -20.2 kJ

2007-10-28 04:53:40 · 1 answers · asked by raleighzia 1

2007-10-28 04:30:04 · 4 answers · asked by Kristyn 2

25cm3 of a solution of an acid HxA containing 0.1 mol dm-3 of the acid in each 1000cm3 of solution reacts with 75cm3 of a solution of 0.1 mol dm-3 NaOH. What is the value of x?

2007-10-28 04:27:59 · 1 answers · asked by Anonymous

fill in the blank.
thanks.

2007-10-28 03:41:39 · 2 answers · asked by timm 1

erature of both solution was 20.2 degree C before mixing and 26.3 degree C after mixing. the heat capacity of the calorimeter is 12.1 J/k. from these data calculate delta H for the process.
CuSo4(1M) + 2KOH(2M) to form Cu(OH)2(s) + K2So4(0.5 M)

2007-10-28 02:48:24 · 1 answers · asked by Anonymous

I have a graph which shows how the pH changes when 0.12M NaOH is added to 25cm³ of a solution of weak monoprotic acid HA. The graph shows pH/volume of NaOH.

I'm asked to calculate the intial concentration of HA. Does [H+] = [HA]? If so, I found it to be 0.02.

I'm also asked to determine the volume of NaOH when [HA] = [A-] but I don't know how to do this. Can anyone help me?

2007-10-28 01:57:58 · 1 answers · asked by Anonymous

I keep on finding different ones on different sites. Does anyone know the real formula. I've found C6H4(OH)(COOH), C7H6O3, C6H4(OH)(COOH)...whcih is it?? Is it any of them??

2007-10-28 01:27:41 · 4 answers · asked by Anonymous

2007-10-28 00:57:30 · 16 answers · asked by Jodie ♥♥ 2

2007-10-27 19:19:20 · 3 answers · asked by Darby 1

How does it work in car batteries, surface and metal cleaners, etc. (write the easiest/simplest answer to one example of the above or any other COMMON example)

2007-10-27 17:17:01 · 2 answers · asked by Anonymous

an unknown solid acid is either citric acid or tartaric acid. to determine which acid you have, you need to titrate a sample of the solid with NaOH. The appropriate reactions are:

citric acid
H3C6H5O7 + 3NaOH --> Na3C6H5O7 +3H2O

tartaric acid
H2C4H4O6 +2NaOH --> Na2C4H4O6 + 2H2O

you find that a .956 g sample requires 29.1 ml of .513 M NaOH for titration to the equivalence point. What is the unknown acid?

I got citric acid. but i'm not sure. could you show me how you go to the answer...because i figured out the moles then i did some stoichiometry and then i don't know exactly what i did...but i got citric acid. please help!!


thank you.

2007-10-27 15:31:53 · 3 answers · asked by Save A Tree [Remove a Bush] 4

resulting solution be supersaturated, unsaturated or just saturated? I think it would be unsaturated?

2007-10-27 15:21:44 · 5 answers · asked by Anonymous

2007-10-27 15:03:10 · 8 answers · asked by Anonymous

2007-10-27 14:52:25 · 1 answers · asked by Foster W 1

my bio class did an experiment to find the realtionship of PH level with enyme activity.
apparently, the buffer solution was used in the experiment for something about PH.
so my questions are, what is a buffer solution?
what does a buffer solution do?
and does a buffer solution speed up chemical reactions?
tell me everything you know about buffer solutions.
thank you!

2007-10-27 14:51:12 · 3 answers · asked by Anonymous

What is the molarity of the solution?

2007-10-27 14:44:51 · 3 answers · asked by Foster W 1

What can you tell about the nature of the iodine molecule? Could it be ionic, polar or nonpolar?

2007-10-27 14:40:37 · 3 answers · asked by Foster W 1

can anyone tell me wat the chemical formula for protein is and how the compound is formed?

2007-10-27 14:38:13 · 3 answers · asked by i am what i am 2

Why is that when an optically active (R)-2-Bromobutane is added to a solution of NaBr in acetone, the solution gradually becomes optically inactive?

2007-10-27 14:26:22 · 1 answers · asked by Anonymous

calculate the number of oxygen present in 50.0 grams of magnesium carbonate trihydrate

2007-10-27 14:25:13 · 5 answers · asked by Anonymous

lead sulfide, in ores, can be assayed by the reaction:

2PbS + 6HNO3 (aq) + K2Cr2O7(aq)--> 2 S + 2PbCrO4(s)+ 4NO2(g) + 2KNO3(aq) + 3H2O

A 6.053 g sample of ore, treated with excess nitric acid and potassium dichromate yielded 6.094 g of lead (II) chromate. Calculate the percent by mass of lead sulfate in the ore.

if you know how to do this...can you show me your work. i did it and i ended up with 37.5 %. I don't know if I did this right...I think I did something wrong with the mole ratio. Thank you so much =]

2007-10-27 14:11:39 · 2 answers · asked by Save A Tree [Remove a Bush] 4

2007-10-27 14:09:34 · 3 answers · asked by soccer_maniaco 1

2007-10-27 14:08:37 · 6 answers · asked by Anonymous

2007-10-27 14:05:11 · 2 answers · asked by Shorty 1

1. Technical grade.
2. Reagent grade is not important
3. Analytical reagent (AR) grade
4. General lab grade.

2007-10-27 14:04:15 · 2 answers · asked by Anonymous

a.Ba(NO3)2 + NH2SO3H + H2O → Ba(NH2SO3)2 + HNO3
b. Ba(NO3)2 + NH2SO3H + H2O → BaSO4 + NH4NO3 + HNO3
c. Ba(NO3)2 + NH2SO3H + H2O → Ba(NH2)2 + H2SO4 + HNO3

2007-10-27 14:03:30 · 4 answers · asked by sam h 1