Chemistry - January 2007

2007-01-26 14:13:39 · 8 answers · asked by happylawlaw 1

And by molecular geometry I mean, for example, Bent, seesaw, square pyramidal, linear, octagonal, etc.

And, thanks in advance for the help!

2007-01-26 13:35:59 · 5 answers · asked by Random G 3

1. Do the properties of pure water from a glacier and from a dessert differ?______Explain____________________________________

2. How do the properties of sodium chloride compare with the properties of sodium and chlorine?_____________________

2007-01-26 13:33:45 · 2 answers · asked by ♥Roberta. 5

Ca(OH)2 + H3 PO4 = > H2 O + Ca4 (PO)2

2007-01-26 13:26:17 · 3 answers · asked by Anonymous

2007-01-26 13:14:26 · 1 answers · asked by Mr Asker Knowmore 2

2007-01-26 13:10:05 · 2 answers · asked by SassyGirl 1

Thanks in advance for the help!

2007-01-26 13:03:39 · 12 answers · asked by Random G 3

Na+NaNO3=Na2O+N2

2007-01-26 12:59:30 · 1 answers · asked by †ღChristian♥Girlღ† 2

Is OH count as an atom? Or OH is something O atom and H atom combined?

2007-01-26 12:38:39 · 3 answers · asked by bchem 1

2007-01-26 12:15:39 · 5 answers · asked by casanova 1

2H2(g) + O2(g) --> 2H2O(g) ΔH = −486.6kJ



Which of the following are true statements for the above chemical reaction ?



a) A phase change is involved


b) Two moles of hydrogen gas react with two moles of oxygen gas to
produce two moles of water vapor


c) Energy is absorbed by the system, the reaction species


d) If the reaction takes place at constant pressure, q = −483.6 kJ


e) ΔH for reacting one mole of hydrogen gas with a half mole of
of oxygen gas is −241.8 kJ

2007-01-26 12:06:54 · 3 answers · asked by Anonymous

For the following reaction to occur
MgSO4 → Mg2+(aq) + SO42−(aq)


the change in enthalpy must be −91.3 kJ/mol


How much heat (kJ) is lost or gained by 278.0 ml of water when 3.01 g of MgSO4 is dissolved in the water ?

What is the change in temperature ( oC ) for the above process assuming no heat is lost or gained by the surroundings ?

2007-01-26 12:06:34 · 1 answers · asked by Anonymous

For the following reaction to occur



MgSO4 → Mg2+(aq) + SO42−(aq)



the change in enthalpy must be −91.3 kJ/mol



How much heat (kJ) is lost or gained by 241.0 ml of water when 3.43 g of MgSO4 is dissolved in the water ?

2007-01-26 12:04:39 · 1 answers · asked by Anonymous

2007-01-26 11:36:23 · 3 answers · asked by janemr83 1

KMnO4=K2O+MnO+O2

2007-01-26 11:27:13 · 3 answers · asked by †ღChristian♥Girlღ† 2

a) 107 g/mol
b)864 g/mol
c)38.6 g/mol
d)14.3 g/mol

2007-01-26 11:22:58 · 1 answers · asked by Anonymous

Could someone tell me about the Cyclic model and maybe give me a site too?

2007-01-26 11:19:31 · 1 answers · asked by Shiro-Chan :D 2

a carbohydrate)solution intravenously. HOw many calories did the patient receive?

How do I do this problem?

2007-01-26 11:12:33 · 3 answers · asked by Anonymous

2007-01-26 10:50:23 · 2 answers · asked by Anonymous

Can someone please explain to me the process of carbon dating? How it works, how accurate it is, etc.
Brief explanation with key points is acceptable. Thanks.

2007-01-26 10:40:50 · 8 answers · asked by CK 5

I am trying to form a stable (Storable) form of Acetaldehyde. but i cant use lead or silver sealer around pure aluminum fittings (Purity reasons) used for distillation, so im wondering if paraldehyde attacks PTFE TAPE? so i can use that.

2007-01-26 10:28:11 · 1 answers · asked by Goldfish 2

Ca+H2O=Ca(OH)2+H2

2007-01-26 10:27:22 · 3 answers · asked by †ღChristian♥Girlღ† 2

2007-01-26 10:13:13 · 1 answers · asked by janemr83 1

2007-01-26 10:11:26 · 1 answers · asked by chemgeek 1

For science we can bring in food for extra credit to put into a vaccum chamber. Does anyone have any idea of what would look really cool in it?

For those of you that dont want to do other peoples homework you can help me. You get the same amount of extra credit points no matter what you bring in. I just want to bring something awesome in

2007-01-26 09:48:45 · 7 answers · asked by That One Guy 2

2007-01-26 09:06:26 · 3 answers · asked by rakkie 1

10-3 m3 = 1 L

2007-01-26 09:01:25 · 2 answers · asked by Anonymous

is there a difference???
or are they the same???

2007-01-26 08:55:20 · 12 answers · asked by Anonymous

The gold-like substance, that is created by putting copper in zinc and flaming it.

2007-01-26 08:37:27 · 5 answers · asked by ? 2

2007-01-26 08:31:58 · 1 answers · asked by profkrakatoa 2