Chemistry - February 2007

A. a combination of mixtures
B. a combination of protons
C. composed of only one kind of atom
D.composed of only one kind of molecule

2007-02-28 06:11:50 · 5 answers · asked by ladona c 1

A. add more chromium nitrate
B. heat it over a flame
C.dissolve the sample in water
D.None of the above, a compound can not be decomposed

2007-02-28 06:07:16 · 3 answers · asked by ladona c 1

Who figured out that adding sugar to a nasty tasting coca bean

would make the resulting product, CHOCALATE one of the most

wonderful foods on the planet?

2007-02-28 05:55:34 · 3 answers · asked by annigoodhere 3

Which statement about an oxidant and its corresponding reducing agent is correct?
Example: In the reaction
K+(aq) + e- → K(s)
K+ is the oxidant and K(s) is its corresponding reducing agent.

1. A strong oxidant will have a weak corresponding reducing agent.

2.A strong oxidant will have a strong corresponding reducing agent.

3.A strong reducing agent will have a strong corresponding oxidant.

4.Both B and C

2007-02-28 05:29:38 · 1 answers · asked by rob d 1

1.216x10^-7 m. by what coefficient should this wavelength be multiplied to obtain the wavelength associated with the same electron transition in the Li2+ ion?
A. 1/3
B. 1/4
C. 1/7
D. 1
E. 1/9

please explain

2007-02-28 04:44:48 · 2 answers · asked by galdon885 1

Why do some molecules have very high energy and why is the curve asymptotic to the horizontal axis?

2007-02-28 04:29:55 · 1 answers · asked by Anonymous

the smell of vinegar ( i have a stuffy nose), so our chem sir told us to add 'SOMETHING' with the given unknown salt in a watchglass,and make a thick paste, and things will be 'SOMEHOW' easier for us.
do u have any idea about these 'something' and 'somehow' ??? plz help me , i've got my exam tomorow.....
i guarantee to select the most convincing answer as the best one.
thanks for ur help.

2007-02-28 04:07:42 · 2 answers · asked by practico 1

2007-02-28 03:55:00 · 4 answers · asked by Faithnomore 2

A chemical reaction may occur when molecules of reactants collide together. Explain why it is that, at a given temperature, only a certain proportion of molecules react together on collision.

Thank you

2007-02-28 03:45:20 · 3 answers · asked by Anonymous

a) At equilibrium DGreaction = 1

b) Q < Keq when DGreaction < 0

c) When Q > Keq addtional products are formed

d) When Q = Keq DGreaction = 0

e) When Q > Keq the amount of products will decrease

2007-02-28 03:05:38 · 3 answers · asked by Gemini 2

S2–(aq) + CrO42–(aq) → S(s) + Cr(OH)3(s)

Which of the following is NOT a step you would take to balance this reaction?

A. Add two electrons to one side of a half-reaction

B. Multiply one half-reaction by 3

C. Add 10OH–(aq) to one side of a half-reaction.

D. Do not change any of the numbers to balance the redox atoms in the two half-reactions

2007-02-28 02:56:34 · 4 answers · asked by rnjes21 2

Here's the question: We give a special name to solutions where water is the solvent, namely "aqueous." The only other type of solution for which the solvent receives special recognition are those where ________ is the solvent.

Choices:
a. xenon
b. chloroform
c. copper
d. mercury

what do you call it?

2007-02-28 02:53:52 · 2 answers · asked by derrick-fish 1

I am at a further education college studying A-level chemistry and am worried about having to use potassium dichromate as I have read that it is carcinogenic. If so, shouldn't it be banned?

2007-02-28 02:37:21 · 12 answers · asked by Anonymous

Hi All,

Im trying to find a product that expands on contact with water/liquid....must be a non food item. Something like expanding foam that comes as a small pellet but when it comes into contact with water, it expands to a much bigger solid size....any ideas anyone?
Kind Regards

2007-02-28 02:31:19 · 2 answers · asked by Fun Guy 2

polyatomic ions are often said to be a cross between covalent compounds and ionic compounds why can they be characterized in such a way???

2007-02-28 02:08:08 · 1 answers · asked by Anonymous

2007-02-28 02:03:02 · 2 answers · asked by Anonymous

2007-02-28 02:02:33 · 6 answers · asked by KAPPOOWWW. 1

WHOEVER ANSWERS WITHIN THE NEXT 2 MINUTES WILL BE CHOSEN FOR BEST ANSWER!!!

2007-02-28 01:55:29 · 2 answers · asked by Swishswishswish 2

2007-02-28 01:51:45 · 6 answers · asked by Anonymous

2007-02-28 01:45:34 · 1 answers · asked by Anonymous

2007-02-28 01:39:28 · 3 answers · asked by Anonymous

2007-02-28 01:37:29 · 9 answers · asked by Anonymous

2007-02-28 01:36:30 · 22 answers · asked by Anonymous

2007-02-28 01:30:02 · 7 answers · asked by Anonymous

2007-02-28 01:29:36 · 8 answers · asked by Anonymous

I am using the answer as a line on a guy, so please make it juicy.

2007-02-28 00:28:16 · 6 answers · asked by Lovechild 2

approx. 20ml or more, perhaps?

2007-02-28 00:20:34 · 2 answers · asked by Anonymous

conversion routes summary

2007-02-27 23:53:35 · 1 answers · asked by Ebot S 1

2007-02-27 23:36:18 · 2 answers · asked by ÎíÈÇÊ Ô 1

2007-02-27 23:29:07 · 1 answers · asked by akbar h 1