Chemistry - March 2007

How many grams of MgCl2 are present in 80.0 mL of 0.100 M MgCl2 solution?

2007-03-26 04:55:56 · 2 answers · asked by kris h 1

how many moles of water are there in 1.00 x 10 raise to power 24 molecules of water?

2007-03-26 04:53:50 · 9 answers · asked by Anonymous

How many moles of Ag+ ions are present in 33 . mL of a 0.520 M Ag2SO4 solution?

2007-03-26 04:41:40 · 3 answers · asked by kris h 1

a) H2


b) Cl2


c) I2


d) MnO4-


e) C

2007-03-26 04:35:14 · 4 answers · asked by Foxychick 1

Please help me figure out this homework question:

"At 800 degrees C, the equilibrium constant for the reaction CO2 + H2 <--> CO + H20 is .279. At a different temperature the equilibrium constant is 0.100. Is this different temperature higher or lower than 800 degrees? Give your reasoning."

Thank you!

2007-03-26 04:28:45 · 3 answers · asked by Annie 4

2.Find the molar mass of the gas measured at the following specified conditions: 0.872 g occupying 1721 cm3 at 281 K and 1.85 atm.

2007-03-26 03:57:54 · 1 answers · asked by ? 3

ok quick question

fission creates a large amount of energy
and fussion is the opposite of fission and it takes a sizable amount of energy to start it

is it possible to make a generator that uses fission to create energy and then use a small percentage of that energy to create fusion to reconstrust the matter back into a fissionable material

considering that fusion uses hydrogen/helium
and fission uses plutonium/uranium i doubt it but its a good concept !!

another question of mine is has anyone ever invented a small nuclear generator ???

2007-03-26 03:46:32 · 4 answers · asked by Anonymous

For eg: ethanoic acid, CH3COOH (a weak acid) is usually paired with CH3COONa (sodium ethanoate/acetate). What is the significance of this pairing? I know the purpose of CH3COONa is to produce CH3COO- ions which will react and hence remove H+ when a little acid is added. I also know when a little base is added, the OH- ions will be removed by CH3COOH. But can I replace CH3COONa with, say, CH3CH2COONa (sodium propanoate)?

2007-03-26 03:37:22 · 4 answers · asked by thereisnospoon 1

What happens when you use a straw to blow into a beaker a quarter full of lime water (Calcium Hydroxide)?

2007-03-26 03:31:49 · 13 answers · asked by Anonymous

2007-03-26 03:09:46 · 1 answers · asked by fathin comey 1

If you leave a glass of water beside your bed overnight, in the morning there are small bubbles in it, stuck to the sides of the glass.

Why is this?

Is it the breath of some sinister underwater creatures?

Is it something dull and chemical?

2007-03-26 03:03:10 · 10 answers · asked by ewanspewan 4

it is for science i need this information before today!! thanks

2007-03-26 03:01:38 · 1 answers · asked by Jessie W 1

how that is going to change the life in future ?

"for making candy to petrol, you will use bio-technology"
this is what i heard, when i ask with an science expert.

Because of Information.Technology i am able to ask this question, will it effect the life the same way, the I.T. did..

2007-03-26 02:45:00 · 4 answers · asked by Anonymous

require for moving car ?

what about any alternative fuel ?

how long vehicle needs oil to move, or demand for oil exist.

2007-03-26 02:38:17 · 3 answers · asked by Anonymous

also bio-chemistry and fisiologia some help whit finding web pages about that thanks!

2007-03-26 02:04:09 · 2 answers · asked by Anonymous

how many percent of alcohol is in the nail remover, perfume and wine, which one has more alcohol ? ? ?

2007-03-26 01:34:36 · 4 answers · asked by Anonymous

1.a student added dilute NaOH to test tuube containing zinc granules and heated the contents it was observed that
a) a colorless gas evolved
b) bubbles started risin up in test tbe
c) soltion remained colorless and transparent
d) zinc graules became red

2.After preparing slphur dioxide gas students are advised not to throw the contents of glass into the sink because the content would
a) damage the sink
b) react violently with water in sink
c) cause pollution
d) poisonous fumes

2007-03-26 00:45:44 · 22 answers · asked by leogodclaw 1

Sr(NO3)2 (aq) is added to 1.0 L of solution containing 0.020 mol F- and 0.10 mol SO4(2-) at constant volume. Which salt precipitates first? What is [Sr2+] in solution when the precipitate start to form?

Ksp for SrSO4 = 7.6 x 10^-7
Ksp for SrF2 = 7.9 x 10^-10

2007-03-26 00:44:59 · 1 answers · asked by sky_blue 1

2007-03-26 00:15:48 · 3 answers · asked by iqnabeel 1

2007-03-26 00:14:50 · 1 answers · asked by Anonymous

2007-03-25 23:45:31 · 1 answers · asked by Lina 1

2007-03-25 23:37:57 · 5 answers · asked by Omar 1

2007-03-25 23:37:24 · 1 answers · asked by jumpy789 1

1) HNO3 + Ca(OH)2 = Ca(NO3)2 + H20.
2) NaOh + H2SO4 = Na2SO4 + H2O.
3) NaCl + AgNO3 = Agcl + NaNO3.
4) Bacl2 + H2So4 = BaSo4 + HCL.

2007-03-25 21:56:20 · 4 answers · asked by TJ 2

I know oil floats on water. But when you spray water on an oil fire, the water has to sink, meaning it goes 'through' the burning oil, which means it has to cool the oil below kindling point and/or temporarily choke off oxygen. So why doesn't water work?

2007-03-25 21:52:47 · 5 answers · asked by Anonymous

2007-03-25 21:52:01 · 3 answers · asked by J M 1

2007-03-25 21:48:26 · 12 answers · asked by scorpe_2000 2

NH4Cl+CuSO4 and Pb(NO3)2+KI

2007-03-25 21:07:45 · 1 answers · asked by Joesph P 1

2007-03-25 21:00:21 · 5 answers · asked by BingBang 1

2007-03-25 20:48:12 · 3 answers · asked by Anonymous