Chemistry - January 2007

industrial chimneys or auto mabile exhausts or jet planes or mining activities?

2007-01-27 00:03:33 · 1 answers · asked by Anonymous

2007-01-26 21:14:35 · 7 answers · asked by totalangel24 1

given the number of electrons in valence shell

2007-01-26 20:34:45 · 7 answers · asked by richie rich 1

Cu + H NO3 produces Cu (NO3)2 + H2O + NO

2007-01-26 19:39:49 · 4 answers · asked by Inquirer 2

I know it is water.

2007-01-26 19:38:11 · 4 answers · asked by Anonymous

i treated benzoic acid and acetic acid in the presence of MnO2.
a white product of needle like crystals having mp 112--115 degree centigrad.what will be this product

2007-01-26 19:14:12 · 1 answers · asked by Anonymous

i treated benzoic acid and acetic acid in the presence of MnO2.
a white product of needle like crystals having mp 112--115 degree centigrad.what will be this product

2007-01-26 19:13:07 · 1 answers · asked by Anonymous

can someone go to this website
http://www.chem.iastate.edu/group/Greenbowe/sections/projectfolder/flashfiles/gaslaw/boyles_law_new.html

and find the pressure for air, oxygen, hydrogen and helium, when the volume is 10?

When i did that, it was 51.45 for all four gases. Is that correct or is there something wrong with my computer?
thanks.

2007-01-26 19:05:53 · 2 answers · asked by . 3

2007-01-26 18:44:15 · 11 answers · asked by ? 6

By the way, the reaction for the combustion of propane is C3H8(l) + 5O2(g) → 3CO2(g) + 4H2O(g).

And, for that equation ΔH = -2220 kJ/mol.

I greatly appreciate any help!

2007-01-26 18:28:52 · 2 answers · asked by Random G 3

Here is the full equation:

2HCl(aq) + Ba(OH)2(aq) --> BaCl2(aq) +2H2O(l)

Thanks in advance for the help!

2007-01-26 18:15:10 · 1 answers · asked by Random G 3

By what kind of bond I mean pure covalent, polar covalent, coordinate covalent, ionic, or metallic? There is one of each of those types of bonds...

2007-01-26 18:06:32 · 3 answers · asked by Random G 3

Calculate the moles of hardening ions in the water sample. Assuming the hardness is due to exclusively to CaCO3, express the hardness concentration in mg CaCO3/L sample.

I do not know how to set this up. My book suggests with an example sort of like this one to use the mv=mv equation. Should I use this or another equation? Please help

thank you

2007-01-26 18:03:17 · 4 answers · asked by wokkie1234 2

Antimony-121 has a mass of 120.9038 u
antimony-123 has a mass of 122.9042 u

the atomic mass of antimony from the periodic table is 121.760 amu.
i need to know the percent abundance of the two isotopes.

please show all steps and formulas
thank you

2007-01-26 17:56:00 · 8 answers · asked by I Like Cheese 2

take (i)a beaker full of water,(ii)a beaker full of sand and (iii) a closed bottle containing a thermometer.keep them in bright sunlight for 3 hours.now measure the temperature of all 3 vessels.also take the temperature reading in shade at the same time.

2007-01-26 17:32:05 · 4 answers · asked by Shruti 1

2007-01-26 17:14:35 · 1 answers · asked by Anonymous

2007-01-26 17:10:29 · 4 answers · asked by W 1

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 253.0 ml of water when 3.60 g of MgSO4 is dissolved in the water ?

2007-01-26 17:09:35 · 2 answers · asked by Anonymous

how do you make the raw material for the philosopher's stone?

2007-01-26 17:01:21 · 5 answers · asked by Marquise H 1

2007-01-26 16:55:46 · 5 answers · asked by W 1

1) Plastic is melted and injected into a mold
2) Protein is digested in the stomach
3) A coal-fired power plant produces gases that cause acid rain
4) Dry ice sublimes into the air

2007-01-26 16:45:23 · 6 answers · asked by theweirdguy1 2

Thanks in advance for the help...

2007-01-26 16:28:18 · 8 answers · asked by theweirdguy1 2

How much heat (kJ) must be removed in order to change 1.40 moles of water at 56.0 oC to ice at -22.0 oC ?


The specific heat capacity of solid water is 2.03 J g-1 oC -1

2007-01-26 15:53:54 · 2 answers · asked by Anonymous

2007-01-26 15:26:26 · 3 answers · asked by theweirdguy1 2

2007-01-26 15:19:00 · 1 answers · asked by teck kim 2

2007-01-26 15:06:37 · 3 answers · asked by minbaker34 1

how many apple seads would you have to eat to die if cyanide poisening?

2007-01-26 14:56:13 · 4 answers · asked by Harezichi 2

Pure Covalent Bond, Polar Covalent Bond, Ionic Bond, Metallic Bond.

2007-01-26 14:53:18 · 3 answers · asked by Random G 3

this is homework please help.

2007-01-26 14:52:43 · 6 answers · asked by lilj1130 1

How do you answer or begin to work the following problem:

3.2 mL of NaOH neutralizes 4.55 mL of 0.0075 M HCl. What was the pH of the acid solution before neutralization.

Thanks!

2007-01-26 14:28:08 · 7 answers · asked by me 3