Chemistry - January 2007

2007-01-13 01:05:15 · 3 answers · asked by subrahmanyam n 1

2007-01-13 00:52:24 · 4 answers · asked by Anonymous

WE HAVE SOME COPPER MINERAL.IN WHICH RADIOACTVITY IS HIGHER.NOW IF I HEAT IT UP TO 1000 DEGREE CENTIGRADE THEN WHAT HAPPEN.

2007-01-13 00:46:43 · 3 answers · asked by rajendra l 1

fill in the blanks

the formula of magnesium oxide is MgO

1)1 mole of magnesium atoms(____grams) and 1 mole of oxygen atoms (____grams) combine to form _____ mole(s) of magnesium oxide (_____grams)

2)12g of magnesium and ____grams of oxygen combine to form ____grams of magnesium oxide

3)when 1.2 grams of magnesium combines with oxygen, the increase in mass is _____grams.

4) if 8 moles of MgO were decomposed to magnesium and oxygen, then we would obtain _____ moles of magnesium and ______ moles of oxygen gas, O2.

2007-01-13 00:08:11 · 2 answers · asked by Sucre 2

what is the formula for calcium oxide?
what is the formula for calcium hydroxide?
what is the formula for calcium hydroxide solution?

2007-01-12 23:42:51 · 3 answers · asked by Anonymous

2007-01-12 23:42:49 · 6 answers · asked by aarshiya 1

i need help with this topic. i'm kinda new to this one. pls show some working as well so that i can learn from there thks.


1) how many moles are there in 8 grams of hydrogen gas?
2)how many moles are there in 8 grams of bromine liquid?
3)how many grams of neon have the same number of atoms as 8 grams of oxygen?


thanks alot!

2007-01-12 23:30:24 · 3 answers · asked by Sucre 2

2007-01-12 23:26:25 · 1 answers · asked by priyanka p 1

2007-01-12 23:24:22 · 1 answers · asked by Anonymous

2007-01-12 23:16:50 · 4 answers · asked by Harriette B 1

i really dont get chemistry, and i dont know how to motivate myself.

2007-01-12 23:13:02 · 6 answers · asked by Anonymous

2007-01-12 22:36:16 · 1 answers · asked by shakti s 1

2007-01-12 21:46:50 · 2 answers · asked by Anonymous

2007-01-12 21:24:45 · 3 answers · asked by Anonymous

i want to know the different types of rexine and the way they are made, and also the products that are made from it..please help.

2007-01-12 21:21:53 · 3 answers · asked by kappy 1

2.4g of a compound of carbon, hydrogen and oxygen on combution gave 3.52g of CO2 and 1.44 H20. The Mr of the compound was found to be 60.
What are the masses of carbon, hydrogen and oxygen in 2.4g of the compound?
What are the empirical and molecular formulae of the compound?

2007-01-12 21:11:29 · 3 answers · asked by Jac 2

20 cm^3 of ozone are partly decomposed by heat to form oxygen. the equation is as follows:
2 O^2 ---> 3 O^3.
After the decompostion, the total volume of gas is 25 cm^3. Calculate the volumes of ozone and oxygen respectively in the final reaction mixture.

2007-01-12 20:54:03 · 1 answers · asked by Jac 2

2007-01-12 20:50:14 · 2 answers · asked by Delta-fan 2

2007-01-12 20:31:20 · 2 answers · asked by Thoginh 2

2007-01-12 19:58:30 · 10 answers · asked by Anonymous

In std VIII Science textbook of Maharashtra Board, they have given that nitric acid can be used in the manufacture of paints. I really don't understand how this can be done.

2007-01-12 19:31:43 · 1 answers · asked by Anonymous

for elecrons in bohr orbits of hydrogen is ..?

2007-01-12 18:58:28 · 3 answers · asked by priyanka p 1

I am working on a science fair experiment, and my teacher offered to create a solution for me. I went in, and she was too busy to help so now I am on my own. I went and bought 28% hydrochloric acid but I need to dilute it to 0.1 M, does anyone know how much water Iand how much acid it will take to dilute it to 0.1 M? (How many grams of acid mixed with how many mL of water to get it diluted).

I was answered this before:
"Hydrochloric acid is anywhere from 28% to 36% HCl, so you'll have to dilute it by roughly 1:60 to get a solution that is an acceptable simulation of gastric juice for your purposes."

But, what does 1:60 mean?

2007-01-12 18:23:19 · 4 answers · asked by dani_es_bonita 1

Don't be a smart ***

2007-01-12 17:33:07 · 8 answers · asked by AppledVolaxin 2

2007-01-12 16:42:39 · 11 answers · asked by Anonymous

i need it for my experiment [science project]

2007-01-12 16:30:40 · 10 answers · asked by sabrina 1

if the experimental density of water is 0.974g/ml.
Give possible reason/s for their similarity and difference.

2007-01-12 16:24:46 · 6 answers · asked by via agatha 1

Doing a history project!

2007-01-12 15:49:54 · 6 answers · asked by Anonymous

Why is MSG considered toxic or allergenic? Since it is the sodium salt of glutamic acid, shouldn't it release glutamic acid upon reacting with stomach HCl? Isn't glutamic acid a natural and required amino acid?

2007-01-12 15:26:02 · 4 answers · asked by Anonymous

Please help.

2007-01-12 14:56:50 · 4 answers · asked by Random G 3