Chemistry - June 2007

Sodium is one of the most used chemical reducer, how do I get it besides melting salt and using a cathode and anode.

2007-06-19 14:13:36 · 3 answers · asked by Anonymous

1. The theoretical effect of an increase in the initial concentration of a reactant can be explained in terms of collision theory because it affects:
i. The collision geometry involved in the reaction
ii. the total number of collisions that occur
iii. the fraction of collisions that are effective
iv. the required activation energy for a reaction

(only ii. is correct, please explain [i though both ii. and iii. were])

2. Which Element is being oxidized in the following reaction?
3 I2 + 10 KNO3 + 4 HCl => 6 KIO3 + 10 NO + 2 H2O + 4 KCl

a. H in HCl
b. N in KNO3
c. K in KNO3
d. I2
e. Cl in HCl

(answer is d. but i'm not sure of how to obtain all of the oxidation numbers...)

..thx ppl... this is for my chem exam review (btw)

2007-06-19 13:46:16 · 4 answers · asked by Anonymous

I wanted to make some crystals really fast... do you have the ingrideints? give me the directions to please.

2007-06-19 13:46:02 · 3 answers · asked by Anonymous

In winter, tubes of metal filled with water is frozen from cold:
1) the tube will explode because it the metal contracts more than water does.
2) the tube will explode because the metal contracts at low temperatures but water volume becames larger when is frozen.

Also I wanted to know: does water occupy more space when it is frozen or liquid?

2007-06-19 13:33:24 · 2 answers · asked by (^_^) CHiccaaqui(^_^) 4

Thanks.

http://www.nysedregents.org/testing/scire/chem606.pdf

2007-06-19 13:05:52 · 2 answers · asked by ╦╩╔╩╦ O.J. ╔╩╦╠═ 6

What does increasing the concentration of an electrolyte solution on the potential difference of a galvanic cell, and why does it do that?

2007-06-19 12:42:29 · 3 answers · asked by Anonymous

2007-06-19 12:34:05 · 4 answers · asked by ? 1

This is my last question about chemistry for this year; my exam is on thursday so please tell me briefly about the Haber process. Ok, I understand it's the reaction of nitrogen and hydrogen to produce ammonia ... ok we got it but who cares? Why is the explanation so long for the Haber process?

I need to understand this for my exam thanks =)

2007-06-19 11:49:11 · 4 answers · asked by A 2

I am taking Chem 110 this summer and I need help...does anyone know in any good Chem sites online that would help explain the octet rule and anything to do with chemical bonds i need help...

2007-06-19 11:14:07 · 4 answers · asked by jen 1

1) The balanced equation below represents a molecule of bromine separating into 2 bromine atoms.

Br2 --> Br + Br

What occurs during this change.

Answer is energy is absorbed and a bond is formed.

2) Which compound is insoluble in water?

-BaSO4 -CaCrO4 -KClO3 -Na2S

Answer is BaSO4

3) What is the total number of pairs of electrons shared in a
molecule of N2?
Answer = 3.

**All the numbers are subscripts.

2007-06-19 11:07:57 · 3 answers · asked by ╦╩╔╩╦ O.J. ╔╩╦╠═ 6

2007-06-19 10:57:02 · 4 answers · asked by (^_^) CHiccaaqui(^_^) 4

HIO3 + H2SO3 gives I2 + H2SO4 +H2O

2007-06-19 10:40:45 · 2 answers · asked by angel 1

' .Lιиdα нυчин,, * says (5:36 PM):
Elements are pure substances that cannot be broken down into simpler substances.
' .Lιиdα нυчин,, * says (5:36 PM):
.. and an atom is just a one kind of particle.
' .Lιиdα нυчин,, * says (5:36 PM):
Is it not?
' ||.аиgєℓа.|| says (5:37 PM):
so can they be the same thing
' ||.аиgєℓа.|| says (5:37 PM):
an element can be an atom
' ||.аиgєℓа.|| says (5:37 PM):
if it is one element right?

We're confused.

2007-06-19 10:39:37 · 6 answers · asked by Anonymous

a)what is the anode reaction in this electrolytic cell?
b) What process occurs at the anode of an electrolytic cell while the cell is opening
Q2. state whether the change of NH3 to dinitrogen oxide N2O is an oxidation/ reduction?

2007-06-19 10:31:03 · 4 answers · asked by angel 1

I heard that a gas tank exploded when the driver turned on his cellphone because it had a leak and the power of the cellphone's signal was enough to make the gas unstable

2007-06-19 10:30:06 · 2 answers · asked by frankcoste04 1

manhattan project, or d-day, or einsteins ashes, or looking glass, or desert storm

2007-06-19 10:07:49 · 4 answers · asked by mommy Ty 3

KMnO4 + H2SO4 + H2O2 --> KMn +H2O + SO2. I have tried looking at websites and texts books and can't get it at all using loads of paper with wrong answers.

Please could you help I would really appreciate it.

Thank you in advance.

2007-06-19 09:18:41 · 6 answers · asked by Cilla D 1

If i recall it was a white powder. We have to make guesses as part of our assignment.

2007-06-19 08:45:52 · 4 answers · asked by Chem_Student 1

give reasons for your answer

2007-06-19 08:39:08 · 6 answers · asked by Anonymous

medicine, or energy, or radioactive dating, or warfare, or all of these

2007-06-19 08:16:18 · 4 answers · asked by mommy Ty 3

half-life of phosphorous-33 is 25.3 days. how long will it take for 64 grams of p-33 to decay to 1.0 grams? 10.67days, or 75days, or 100days, or 120days, or 150days

2007-06-19 08:13:45 · 2 answers · asked by mommy Ty 3

mixture of ethan and ethen with original volume 150 cm3 has now after bubbling through water delution volume of 60 cm3. what is percentual compound of original gases in volume percents? (volumes are measured with constant temperature and pressure)

2007-06-19 07:40:18 · 2 answers · asked by Anonymous

2007-06-19 07:33:49 · 3 answers · asked by Tone 1

2007-06-19 07:32:42 · 6 answers · asked by Tone 1

Doing a short research paper on an enzyme. What is a easy to understand enzyme that I could do?

2007-06-19 07:28:00 · 2 answers · asked by HushYourFuss 3

2007-06-19 07:25:14 · 3 answers · asked by Tone 1

H2O
CCL4 *******
NH3
H2

Can someone explain how you got the answer! plz. I know its CCL4, but how do you know its not the rest of formulas?

Piggy back this 1.

Which substance contains bonds that involved the
transfer of electrons from one atom to another?

(1) CO2 (3) KBr***
(2) NH3 (4) Cl2

Why is it KRr and not NH3...i'm sorry, i'm confused..plz explain, you might get it. thanks.

2007-06-19 07:18:07 · 4 answers · asked by Anthony L 3

air pollution, or acid rain, or greenhouse gasses n, or waste disposal, or low energy yield per pound

2007-06-19 07:10:05 · 5 answers · asked by mommy Ty 3

binding energy,or chain reaction,or alpha emission,, or gamma radiation, or radioactive

2007-06-19 07:06:39 · 3 answers · asked by mommy Ty 3

2007-06-19 06:44:38 · 3 answers · asked by Anonymous