Chemistry - February 2007

Or is there no name for the gas that kills?

2007-02-28 23:59:54 · 6 answers · asked by nick78_78 1

If it’s possible to have pacific answers for that and another one too and the anther one is where polymers exist in nature?

2007-02-28 23:52:39 · 1 answers · asked by saso 1

I did this in my lab and it was about equilibrium reactions. I not qiute understand what reacts with what. So if you can help me to write chemical reaction it will be great.
Thanks

2007-02-28 23:34:48 · 1 answers · asked by lenok_03 1

e.g. irritant, corrosive in high conc.,

2007-02-28 22:57:23 · 4 answers · asked by Anonymous

Help me. Question is here:

Long ago people tried to change inexpensive metals, such as lead, into gold. What fundamental principle of matter did these people fail to understand?

2007-02-28 22:44:32 · 4 answers · asked by Anonymous

Addition of 12M (concentrated) HCl to saturated NaCl results in precipitation of NaCl. Yet when 1M HCl is added to the same NaCl solution, no precipitate forms. Please Explain.

Thanks

2007-02-28 22:21:54 · 2 answers · asked by Master 2

2007-02-28 21:34:39 · 5 answers · asked by raz 1

2007-02-28 21:32:50 · 4 answers · asked by raz 1

2007-02-28 21:27:44 · 1 answers · asked by rina j 1

2007-02-28 21:26:19 · 5 answers · asked by rina j 1

and if possible give me a site which teach us how to make perfume.... especially perfume from acethaldehydes

2007-02-28 20:45:31 · 1 answers · asked by Papilio paris 5

some books says 135
other says 138-140

whats the correct

2007-02-28 20:29:50 · 0 answers · asked by Anonymous

anything to do with the relationship between salt and corrosion would help.
actually anything to do with the salt would help
same goes for corrosion.

2007-02-28 20:25:55 · 3 answers · asked by blair 2

2 questions im stuck on, any help would be appreciated, may thanks in advance!
Question 2 of 15
Predict the shapes of
(i) phosphine, PH3

(ii) sulphur trioxide, SO3

(iii) the sulphite ion, SO32-

(iii) the amide ion, NH2-

Question 4 of 15
(a) Given the following data, construct a Hess's Law cycle and calculate the standard enthalpy of formation of ethane, Hf [C2H6].
2C(s) + 3H2(g) → C2H6 (g)

delta Hc carbon = -394 kJ mol-1
delta Hc hydrogen = -286 kJ mol-1
delta Hc ethane = -1560 kJ mol-1

2007-02-28 20:25:49 · 1 answers · asked by DC 1

2007-02-28 20:22:52 · 2 answers · asked by Kuhan K 1

I am new to chem and am struggling!
If I dissolve 39.998 grams of NaOH in 1 Liter of water. The formula of the dissociation of NaOH is NaOH(s) + H2O(l)--------> Na+(aq) + OH-(aq) Now how do I show the full steps of do this (using what eqautions) to obtain the Molarity-M?

2007-02-28 19:49:39 · 1 answers · asked by Gideon 1

Sorry, I'm not a native English speaker. And I have no idea what do these substance named in English...
so I'll type the Indonesian name of it....

Nipasol
Nipagin
purin
pirimidin
metil salisilat (methyl salisilate)
naftalena

and a 3 benzene which stick each other.

thank you....

2007-02-28 19:45:26 · 2 answers · asked by la montée 4

2007-02-28 19:31:35 · 2 answers · asked by unibloke1 1

a. Pb(NO3)2 or KNO3

b. HCl or H2SO4

2007-02-28 19:18:50 · 1 answers · asked by Jay 2

Do I need a special Type of teflon?? or is it a thickness thing?

2007-02-28 19:17:49 · 1 answers · asked by Anonymous

HNO_3 + K_2CrO_4 + Fe(NO_3)_2 -> KNO_3 + Cr(NO_3)_3 + Fe(NO_3)_3 + H_2O

Alright... this one's tricky. If you can solve it, you're a genius. Seriously. I hadn't checked my email earlier when I posted this Q, but my prof has emailed me some help which I will post in the 'added detail.' Thanks everybody.

2007-02-28 19:17:21 · 1 answers · asked by thesekeys 3

2007-02-28 18:27:10 · 3 answers · asked by Syafina L 1

How do you separate a three-component mixture made up of an acid, a base and a neutral compound?????

2007-02-28 18:21:10 · 3 answers · asked by donna 2

for the following reaction at a certain temperature
H2 (g) + F2 (g) -> 2HF (g)
(NOTE: !!!!!!!! it's at equilibrium !!!!!!!!!!!!!)



it is found that the equilibrium concentrations in a 5.00 liter rigid container are [H2] =0.05 M, [F2]=0.01M, and [HF] =0.4M. if 0.2 mol of F2 is added to this equilibrium mixture, calculate the concentrations of all gases once equilibrium is reestablished.

2007-02-28 18:19:32 · 2 answers · asked by goodbye say bye 1

If you have Copper(II) Sulfate + Sodium Phosphate
what is the molecular, complete net ionic, and net ionic equations?

2007-02-28 18:11:26 · 1 answers · asked by shane200388 1

2CrO^2-(aq) + 2H_2O(l) + 6ClO^-(aq) -> 2CrO_4^2-(aq) + 3Cl_2(g) + 4OH^-(aq)


Identify the following statements about the above equation as true or false.

A) ClO- is the reducing agent.
B) CrO2- is the oxidizing agent.
C) Electron transfer occurs from ClO- to CrO2-
D) ClO- is being oxidized.
E) ClO- is being reduced.

From my homework. My main problem is classifying ClO-.. .any help with this problem would be FANTASTIC. thanks

2007-02-28 17:57:56 · 1 answers · asked by thesekeys 3

Explain the meaning of this statement: " No gas exhibits ideal behavior at all temperatures and pressures." At what conditions do real gases behave like ideal gases? Why?

This is 1 whole problem ... If you answer it please answer the whole thing. I already know what iseal and real gases are so please do not try to explain that to me.

Thanx

~Me

2007-02-28 17:50:13 · 1 answers · asked by blackfever08 2

HNO_3 + K_2CrO_4 + Fe(NO_3)_2 -> KNO_3 + Cr(NO_3)_3 + Fe(NO_3)_3 + H_2O

Yea I'm normally just fine balancing equations... but this one, not quite! Any help greatly appreciated. Thanks!

2007-02-28 17:42:15 · 2 answers · asked by thesekeys 3

2007-02-28 17:35:26 · 1 answers · asked by may-may l 1

Please can anybody write this in net ionic equation for me?

5 NaBr+ NaBrO3 + 3 H2SO4----------> 3 Na2SO4 + 3 Br2 + 3 H2O

2007-02-28 17:29:54 · 1 answers · asked by Alan l 1