Chemistry - November 2007

2007-11-08 15:15:05 · 1 answers · asked by tibsy2007 2

CaO + C ----> CaC2 + CO2

2007-11-08 15:11:18 · 3 answers · asked by Amusing but confusing 3

i need an understanding of this concept

2007-11-08 15:10:01 · 2 answers · asked by Anonymous

Is H2 an insoluble gas?

Are there any other examples of insoluble gases?

2007-11-08 15:09:34 · 5 answers · asked by Anonymous

reflection, refraction, diffraction, interference, and absorption.
wat does compare and contrast mean anyways? how do u contrast?

2007-11-08 15:06:28 · 2 answers · asked by rissa 2

2007-11-08 15:04:14 · 5 answers · asked by sabreen 1

This is for a biology crossword of 33 clues. So it's not that much!

3. A carboxyl group releases hydrogen ions in water so it is an organic _ c _ _

29. An anime functions as an organic _ a _ e
32. methan belongs to this group of compounds _ y _ _ _ _ _ _ _ _ _ (not sure if the y is right, so don't worry too much about it)
33. The cellulose material that should be a part of your diet _ _ _ e _

6. A polysaccharide composed of hundreds or thousands of glucose molecules. _ _ a _ c _

2007-11-08 13:51:19 · 3 answers · asked by Anonymous

iron is generally produced from iron ore through the following reaction in a blast furnace : Fe2O3(s)+ CO(g) ---> Fe(s)+CO2(g).

a. If 4.00 kg of Fe2O3 are available to react, how many moles of CO are needed?
b. How many moles of each product are formed?

2007-11-08 13:49:43 · 1 answers · asked by Anonymous

thanks

2007-11-08 13:49:39 · 3 answers · asked by Anonymous

If 4.50 mol of ethane, C2H6, undergo combustion according to the unbalanced equation C2H6+O2--->CO2+H2O, How many moles of oxygen are required?
b. How many moles of each product are formed?

2007-11-08 13:42:58 · 1 answers · asked by dcpepsi92 1

In which one of the following does iodine have an oxidation number of +1?

(1) I3 -
(2) IO 3 -
(3) NaIO4
(4) IO -

answer for this is (4)...Please help me by showing me how the oxidation state/number changes for all the 4 options..i really need help on this..thanks

2007-11-08 13:42:56 · 2 answers · asked by Anonymous

2007-11-08 13:27:15 · 2 answers · asked by Fifi 2

How many grams of steam at 100 deg. C would be required to raise the temperature of 43.6 g solid benzene (C6H6) from 5.5 deg. C to 30.0 deg. C?
Hfus for benzene: 9.87 kj/mol
specific heat for benzene: 1.63 J/g x deg
Hvap for steam at 100 deg. C: 40.7 kj/mol

Could you explain how I would go about solving this?
Thanks!

2007-11-08 13:23:52 · 1 answers · asked by Anonymous

I'm trying to find out how much 1 atom of gold is worth at todays market price.

2007-11-08 13:15:31 · 3 answers · asked by ital_leprikon 1

2007-11-08 13:14:55 · 3 answers · asked by Cooley 1

2007-11-08 13:10:02 · 2 answers · asked by Anonymous

Please explain, im confused. Thanks

2007-11-08 13:07:16 · 2 answers · asked by Anonymous

1.80g of water contains how many moles of hydrogens?

2007-11-08 12:51:10 · 2 answers · asked by Mio 2

41. A sample of gas is collected over water at a temperature of 35.0 degrees C. When the barometric pressure reading is 742.0 torr. What is the partial pressure of the dry gas?

2007-11-08 12:48:24 · 2 answers · asked by loveme 1

39. Three of the primary components of air are carbon dioxide, nitrogen, and oxygen. In a sample containing a mixture of only these gases at exactly one atmosphere pressure, the partial pressures of carbon dioxide and nitrogen are given as P co2 = 0.285 torr and P n2 = 593.525 torr. What is the partial pressure of oxygen?

2007-11-08 12:46:47 · 3 answers · asked by loveme 1

Which of the following methods would not produce ammonia?

(1) Heating a nitrate solution with aluminium powder in sodium hydroxide
(2) Heating ammonium chloride with calcium hydroxide
(3) Heating ammonium sulphate with sodium hydroxide
(4) Heating ammonium sulphate with dilute hydrochloric acid

The answer is (4)..Why is that so? I really don't understand...Please explain to me...Thanks

2007-11-08 12:37:46 · 2 answers · asked by Anonymous

i need what elements make up pool chlorine elements as in on the periodic chart

2007-11-08 12:34:56 · 2 answers · asked by Rissa 2

36.0g of water contains how many g of oxygen?

2007-11-08 12:29:45 · 2 answers · asked by Mio 2

The problem:
How many molecules is in each of the following?
1.50 X 10^23 molecules NH3

I just need help to solve one and then I can do the rest on my own. How do I solve this equation?
These are the others:
1 billion (1 X 10^9) molecules O2
6.02 X 10^22 molecules Br2
4.81 X 10^24 atoms Li

2007-11-08 12:26:21 · 3 answers · asked by Anonymous

2007-11-08 12:18:25 · 2 answers · asked by Anonymous

Which of the following could best be prepared by a reaction involving an acid?

(1) iron(II) carbonate
(2) lead(II) carbonate
(3) magnesium sulphate
(4) silver chloride

The answer is (3) magnesium chloride...why? Please explain cos I really need to understand..Thanks.

2007-11-08 12:14:12 · 5 answers · asked by Anonymous

2007-11-08 12:09:05 · 1 answers · asked by Anonymous

2007-11-08 12:06:40 · 8 answers · asked by Anonymous

2007-11-08 12:00:20 · 4 answers · asked by Anonymous

LiOh+H2O->
dont need to balance

2007-11-08 11:47:04 · 2 answers · asked by Anonymous