Chemistry - August 2007

Gaseous hydrogen and oxegen reacts in closed vessel at 20degrees to form water:
H2 + 1/2 O2 = H20

What would graph of pressure within vessel as time passes be like??
If vessel contains 0.2 mol oxygen and 1 mol hydrogen determine initial and final pressure

2007-08-14 03:28:04 · 1 answers · asked by philip c 1

why would acyl halides give higher yields of amides compared to carboxylic acid or ester on reaction with ammonia

why should excess alkalide be avoided in the FeCl3 test for CH3COOH and benzoic acid?

pls answer as soon as possible...thanks

2007-08-14 02:33:03 · 4 answers · asked by louie 2

2007-08-14 02:07:55 · 1 answers · asked by patrickmel11 1

Pls. help...

2007-08-14 02:06:07 · 2 answers · asked by acid_heroine 3

What properties does it have that might affect how it is being used?

2007-08-14 01:11:23 · 2 answers · asked by heizel 2

it needs to be cheap and available.
It also need to be safe that the raw material and its product after sublimation (gas) are not toxic.

2007-08-14 01:07:29 · 2 answers · asked by Brian C 2

name of the chemical or material......

2007-08-14 01:06:59 · 15 answers · asked by Ankush 1

please help... co'z its my assignment for tommorow!!!

2007-08-13 23:27:44 · 2 answers · asked by jestin 1

2007-08-13 22:59:55 · 1 answers · asked by Anonymous

please do help me coz i have to report on that. thanks :)

2007-08-13 22:58:20 · 1 answers · asked by bianca 1

2007-08-13 22:52:25 · 1 answers · asked by Anonymous

2007-08-13 22:24:03 · 2 answers · asked by Daniel 1

When somehing dissolves does it just mean it has been broken down? I'm having a hard time understanding why sugar is said to dissolve in water and something like flour does not?

2007-08-13 21:29:08 · 4 answers · asked by beatme 3

2007-08-13 21:14:02 · 3 answers · asked by philip c 1

2007-08-13 20:38:09 · 2 answers · asked by Anonymous

Explain why its reaction with ammoniacal cuprous chloride and silver nitrate are considered as reactions of an acid?

2007-08-13 20:34:44 · 3 answers · asked by Anonymous

27. 64^Co decays by a first-order process via the emission of a beta particle. The 64^Co isotope has a half-life of 7.8 min. How long will it take for 31/321 of the colbalt to undergo decay??

a. 7.8 min
b. 16 min.
c. 23 min
d. 31 min
e. 39 min

2007-08-13 17:32:40 · 2 answers · asked by Tom M 1

I
Turn an open bottle upside-down for a draining experience... or maybe not.

Ingredients:

-Water (Do Not use a carbonated beverage like soda for this trick.)

- Empty glass drink bottle (any kind will work)

- Paper napkin or any small piece of paper

The Recipe:

1) After you finish emptying a glass bottle, refill it to the brim with water. Fill it so high that you get a little water bulging at the top of the bottle.

2) Tear-off or find a piece of paper that is a little bigger than the mouth of the bottle.

3) Place the paper over the mouth of the bottle.

4) Lightly tap the paper on top of the bottle to make sure it gets wet and makes a good seal with the bottle's glass lip.

when you flip it over the water doesnt drip.

2007-08-13 16:10:03 · 3 answers · asked by Madeline G 2

2007-08-13 16:03:26 · 11 answers · asked by Anonymous

32. Sea water has a pH of 8.10 What is its hydrogen-ion concentration?

33. The hydronium-ion concentration of a 0.0010 M acetic acid solution is 1.0 x 10^-4 M. What is the Ph of this solution?

34. The concentration of H3O+ in a solution is 2 x 10^-4 M what is its OH- concentration?

35. The pOH of a solution is 5.50. What is its hydroxide-ion concentration?

36. The pOH of a 0.015 ammonia solution is 3.28. what is its hydroxide-ion concentration?

37. The pH of 0.1 M NH3 is approximately???
a. 1
b . 3
c. 7
d. 11
e. 13

38. A solution in whihc the pOH is 5.3 would be described as
a. very acidic
b. slightly acidic
c. neutral
d. very basic
e. slightly basic

39. Which solution has the lowest pH?
a. 0.1 M HCl
b. 0.1 M NaOH
c. 0.1 M NH3
d. 0.1 M CH3COOH
e. 0.1 M Na2CO3

40. A solution which is formed by combining 700. mL of 0.20 M HCl with 300. mL of 0.50 M NaOH has a (H3O+) concentration of ??

2007-08-13 15:22:41 · 3 answers · asked by Kristin R 2

2007-08-13 15:19:31 · 3 answers · asked by ashik r 1

2007-08-13 15:06:10 · 2 answers · asked by lyzander_sardonido 1

The atmosphere is made out of over 75% nitrogen. My question is how do humans obtain this nitrogen.

2007-08-13 14:34:41 · 4 answers · asked by techtonick.com 2

My b/f asked me out of the blue one day, "How can water get on fire?" My reply was, "The only way there will be fire on the water is if there is gas, petrol or anything chemical that can catch on fire" Maybe there is a better way of explaining this. He also asked, "So, how long can we keep the fire burning on the water?" I guess as long as there is enough gas,petrol or other chemical on the surface of the water. Am I right? Can someone please explain this science in a simple english term, thank you.

2007-08-13 14:31:50 · 3 answers · asked by Matahari 1

If a group III unknown produces a pink precipitate with a basic solution of thioacetamide, which cations are probably absent?

Group III cations are Ni +2, Co +2, Fe +2, and Mn +2

2007-08-13 14:22:54 · 1 answers · asked by greensock 5

If you know of any PLEASE let me know. Thanks.

2007-08-13 12:45:03 · 5 answers · asked by Anonymous

Do fate and karma really happen?

2007-08-13 12:05:23 · 10 answers · asked by im2jaded04 3

2007-08-13 11:27:59 · 4 answers · asked by sikhism4life88 1

2007-08-13 09:39:10 · 9 answers · asked by vici 4

When pigments are suspended in oil why doesn't the oil affect the colour of the pigment?

2007-08-13 08:42:15 · 3 answers · asked by beatme 3