Chemistry - November 2007

what is the effect of temperature on the solubility of solute and gas in water?

2007-11-19 23:23:20 · 1 answers · asked by anna101085 1

2007-11-19 23:13:04 · 1 answers · asked by jamie 1

Need to figure what formula to use , So I can undewrstand how to work the rest of the problems I have in this same set up
thank you

2007-11-19 22:02:30 · 1 answers · asked by HisGlory 1

Not very chemically minded is this about Morse Functions on Orbifolds. Help would be appreciated.
Thanks

2007-11-19 18:01:12 · 1 answers · asked by dave k 1

a 27.0 g sample of an unknown hydrocarbon CxHy is burned in excess oxygen to form 88.0 g of C02 and 27.0 g of H20. What is the empirical formula?

2007-11-19 17:59:51 · 1 answers · asked by linh 1

2007-11-19 17:37:30 · 6 answers · asked by Frank Le 1

I need to make 100 mL of Mg( NO3)2 and I need to know how much magnesium I need.

I have HNO3 which is 16 M (molarity). I need to know how much Magnesium I need to dissolve in the nitric acid (HNO3) to make 100 mL of Mg(NO3)2, which should have a molarity of .1 M.

1) I wrote out the balanced equation

Mg+ 2HNO3= H2 + Mg( No3)2

2) I calculated the amount of moles of Mg(No3)2

.100 L *.1 M= .01 mol Mg( No3)2

since M1V1=M2V2, there are also .01 mol of HNO3

3) .01 mol HNO3* 1mol Mg/2Mol HNO3*24.31g/1 mol=

.122 grams Mg

ok so my answers is .122 grams. other people though got .24 grams! am i right? or maybe to write out the balanced net ionic equation? i dont know

2007-11-19 17:34:33 · 4 answers · asked by Anonymous

if there r two different gases in the same container with the same # of moles, do they have the same pressure?

like, H2 and O2 have the same # of moles. do they have the same pressure when they'r in the same container?

2007-11-19 17:00:39 · 3 answers · asked by Ganbatteru 3

Can someone please give me the balanced equation for these compounds.

2007-11-19 16:07:02 · 4 answers · asked by I M Alexis 1

2007-11-19 16:06:18 · 2 answers · asked by vince 1

Which of the following are reducing agents ?

a) HNO3

b) Na

c) Br2

d) Cu

e) C

2007-11-19 15:53:04 · 1 answers · asked by Anonymous

240mL of water = 240 grams of water
ice=0 degree celcius
(i got 31.6grams as my answer)

2007-11-19 15:47:26 · 2 answers · asked by CuriousOne 1

i know that calcium is the most reactive, but i need an experiment to support that answer

2007-11-19 15:33:38 · 1 answers · asked by Kasey13 1

2007-11-19 15:21:55 · 1 answers · asked by Anonymous

Can't find the answer in the book or my notes. =[

2007-11-19 14:27:49 · 2 answers · asked by Anon E. Mous A 1

can you give me an example of why studying kinetics is important in life??

for example, studying how a certain chemical reaction is effected by temperature, concentration and determining rate reaction and such, you can decrease chances of explosion in a lab.

I want a better example than this, hehe

thanks!!

2007-11-19 14:27:28 · 1 answers · asked by Anonymous

added to 135 mL of a 1.00 M potassium sulphate solution. The total heat capacity of the calorimeter including all the contents was 1.75 kJ oC-1. The temperature in the calorimeter rose from 24.50oC to 28.70 oC.

Calculate the enthalpy change, in kJ, for the reaction:
Me2+ (aq) + SO42- (aq) = MeSO4 (s).
Me is the alkaline earth metal in question.

2007-11-19 14:25:29 · 1 answers · asked by Anonymous

could the person have discovered a new element?

this question was on my chemistry study guide/review, and it seems like there is just not enough info. trick question?

and no, this isn't for homework, it's a question on a review packet for our next test.

2007-11-19 13:04:24 · 2 answers · asked by Kasey13 1

Which of the following statements are true?

For statements a) through d) use the reaction:
Cu(s) + 2Ag+(aq) --> 2Ag(s) + Cu2+(aq)
a) Cu is the reducing agent
b) Ag+ is the reducing agent
c) Cu is oxidized
d) Ag+ is oxidized
e) Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g) is a redox reaction
f) Al(OH)4-(aq) --> AlO2-(aq) + 2H2O(l) is a redox reaction

you must enter all true statements in one lower case group,
in alphabetical order
e.g., if a) b) and e) are true you would enter abe

2007-11-19 13:00:27 · 3 answers · asked by physicsisgay 2

All I've got says it does, but acetate's protic so wtf........or maybe if you count it as the wb then I guess it makes sense.... ??? IDK I was going for SN1 or E1..

2007-11-19 12:57:31 · 2 answers · asked by bad_banking 3

2007-11-19 12:46:50 · 2 answers · asked by Anonymous

Hello. Could you please help me with these? We started a lesson today and I was not in class so I have no idea what I'm doing and these are due tomorrow. Could you please show all work and all of that jazz?
Thank you so much!

1) Write word and formula equations for the reaction in which aqueous solutions of sulfuric acid and sodium hydroxide react to form aqueous sodium sulfate and water.

2) Translate the following chemical equations into sentences:

a) 2K(s) + 2H²O (l) ----> 2KOH (aq) + H² (g)

b) 2Fe (s) + 3Cl² (g) -------> 2FeCl³ (s)



3) Write the word, formula, and chemical equations for the reaction between hydrogen sulfide gas and oxygen gas that produces sulfur dioxide gas and water vapor.


4) The reaction of vanadium (II) oxide with iron (III) oxide results in the formation of vanadium (V) oxide and iron (II) oxide. Write the balanced chemical equation.


Thats it, please help me! Anything you can do helps me out bunches! Thank you!!

2007-11-19 12:45:04 · 1 answers · asked by :) 4

1. AlF3
2. FeCl2
3.Co(NO3)2
4. MgSO4
5. NH4Cl
6. CrPO4
7. Ba(OH)2
8. Na2CO3
9. BaF2
10. Cu(NO3)2
11. NiSO4
12. Zn3(PO4)2
13. NA3N
14.CuCO3
15. (NH4)2SO4

PLEASE HELP..AND THANK U!!

2007-11-19 12:38:28 · 3 answers · asked by Anonymous

2007-11-19 12:34:04 · 5 answers · asked by Anonymous

So I'm having a test on formula writing tomorrow, and I need to memorize a bunch of polyatomic ion charges. However, I recall my teacher saying that there is a somewhat easier way to go about doin this. Like depending on what the polyatomic ion ends in (like ite, ate etc) you can determine the charge more easily.
If somebody knows what I'm talking about, and could expand on it I would really appreciate it, and I will give 10pts to the best answer.

2007-11-19 12:33:29 · 3 answers · asked by Person X 2

2007-11-19 12:25:41 · 4 answers · asked by Anonymous

how do i put these as a scientific notation...

1) 10,000
2) 0.0001
3) 10,000,000,000
4) 50,000
5) 2,000,000,000
6) 0.000.000 4
7) 0.0003
8) 790,000
9) 0.0175
10) 371
11) 0.00900
12) 0.62
13) 328 500
14) 76 450
15) 0.000 705

2007-11-19 12:19:45 · 4 answers · asked by Rosanna D 1

2007-11-19 12:16:03 · 1 answers · asked by Anonymous

Ca(s) + Cu(NO3)2 --> ?
In Net ionic also.

My guess is Ca(s) + Cu^2- +2NO3^- --> Ca^2+ + 2NO3^- + Cu?
My question is with the product of copper. Is it Cu2 in a gaseous state or is it something different. This is my main concern if someone could explain this to me.

Also, if you want to do more here are the other ones.

These are the solutions I'm reacting the metals (Ca, Cu, Fe, Mg, Sn, & Zn) with:
1. Ca(NO3)2
2. Cu(NO3)2
3. FeSO4
4. Fe(NO3)3
5. Mg(NO3)2
6. SnCl4
7. Zn(NO3)2
I'm supposed to write the complete and Net ionic Eq. I can figure the Net ionic out if you help me with the complete.

From what I could tell, Cu, Sn had no reactions with any of them. Some of the other reactions didn't take place.

2007-11-19 12:06:12 · 1 answers · asked by Anonymous

i just cant seem to get to grips with moles can someone walk me through this question

In a titration, 25cm3 of 0.01M potassium hydroxide is pipetted into a conical flask. Sulphuric acid is run in from the burette and it is found that 19.8 cm3 were required to react exactly. Calculate the concentration of a solution of sulphuric acid

H2SO4(aq) + 2HNO3(aq) to K2O(l) + CO2(g)

2007-11-19 12:01:58 · 6 answers · asked by Anonymous