what is percentage composition????????

what is cyanide...???? its trobleing me a lot....

what is the formula for ferric ferricyanide?

pls give me the formulas for the following:

1. aluminium floride

2. plumbus phosphate

3. nickel carbonate

4. mercuric phosphate

5. cupric nitrite

6. ferrous hydroxide

7. ammonium nitrate

8. potassium ferrocynide

9. sodium chlorate

10. potassium hypochlorite

11. potassium magnate

12. stanus chloride

13. calcium plumbate

14. lead chromate

15. lead acetate

and also tell me what is plumbus.....?????

 Write the balanced equations for the following chemical reactions.

1. Barium chloride + Sodium sulphate → Barium sulphate + Sodium chloride

2. Sodium + Water → Sodium hydroxide + Hydrogen

Correct anwser?
 

Ba

 . The ratio by mass between carbon and oxygen C: O is 12:32 i.e., 3:8.

How to find that?

can you balance this equation -

AlN₃ + H₂O -> Al(OH)₃ + NH₃

 meritnation experts , i'm unable to understand the writing of a chemical formula for a compound . its a common question in our exams and that where i lose marks .

i studied the study material but it all went over my head. can u explain it to me again with examples (like calcium oxide etc ).

pls try answering fast. even other fellow students can answer . 

 what is octet rule

Why is the electronic configuration of potassium 2,8,8,1 and not 2,8,9, ?

If you say that's bcoz of octet rule then why is the electronic configuration of Chromium 2,8,13,1

Define atomic mass unit.

In paper that is cellulose [C₆H₁₀O₅]n

what is n

why the molecular formula of zinc carbonate is ZnCO₃.

why silver exhibits a valency of +1 and +2.

Why is the valency of metal potassium is +1 and of the non-metal chlorine is -1.