Answer for Part d(i)

Answer for d(i.) Reaction with aqueous sodium hydroxide.

Chem Pract (2001 'O' Level Paper)

Answer for Part C, test for carbon dioxide.

Chemistry (Formula of Ionic Compunds)

Completed the table in the picture.

Math Test on 20 Feb 09! Reminder!!!

Topics covered will be Vectors (Worksheet A and B)
Study for it. You can do it if you want to.

If these two boys are so hardworking, why can't you? Guess who they are?

Redox Reactions

Answer all the questions

1. Complete the following:

(i) Oxidation is the loss of _____________ or the ________ of oxygen.

(ii) Reduction is the loss of _____________ or the ________ hydrogen.

2. For each of the following reactions, explain which substance is oxidized and which substance is reduced?

(a) Fe2O3 + 3CO  2Fe + 3CO2

_______________ is oxidized.

Reason: ____________________________________________________

___________________________________________________________

_______________ is reduced.

Reason: ____________________________________________________

___________________________________________________________


(b) 4HCl + MnO2  MnCl2 + Cl2 + 2H2O

_______________ is oxidized.

Reason: ____________________________________________________

___________________________________________________________

_______________ is reduced.

Reason: ____________________________________________________

___________________________________________________________

Balance these equations

18 Feb 2009

1. ___ Cu(s) + ___ O2(g) --> ___ CuO(s)

2. ___ H2O(l) --> ___ H2(g) + ___ O2(g)

3. ___ Fe(s) + ___ H2O(g) --> ___ H2(g) + ___ Fe3O4(s)

4. ___ Fe2O3(s) + ___ H2(g) --> ___ Fe(s) + ___ H2O(l)

5. ___ CaCO3(s) --> ___ CaO(s) + ___ CO2(g)

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