redox by a'bidah, hamidah, syakiran, zulkamal and elfi.

2. Redox reaction are chemical
reaction in which reactants
experience a change in oxidation
number.
Oxidation is the gain of oxygen.
Reduction is the loss of oxygen

4. No Definition Oxidation Reduction
1 Oxygen Transfer Gain O (+) Lose O (-)
2 Hydrogen Transfer Lose H (-) Gain H (+)
3 Electron Transfer Lose E (-) Gain E (+)
4 Change in Oxidation state Increase (+) Decrease (-)
number

5. Find the oxidation states of
each element in (NH4)2SO4
The ammonium ion NH4+ has an overall charge of +1. The nitrogen
atom (-3),
Hydrogen atom (+1). The sulfate ion (SO4 2-) has an overall charge of -
2. (-2) for oxygen
Atom and (+6) for sulfur atom.

6. In a Nutshell….

7. Reducing agents can react
with Reducing agents.
Reducing agents cannot
react with Oxidizing agents.
Oxidizing agents cannot
react with Reducing agents.

8.  Chemicals added: Acidified Potassium
Dichromate(VI) and Bromine/Iodine
solution.
 Observation: Acidified Potassium
Dichromate(VI) turns from orange to
green. Iodine solution turns from brown
to colorless. OR Bromine solution turns
from Reddish brown to colorless.
(Solution decolourised)

9.  Chemical added: Potassium iodide
solution and Carbon.
 Observation: Colourless Potassium iodide
solution turns Brown. Also, Black C(s)
dissolves. CO2(g) evolved forms white
precipitate in limewater.

10. Forthe following QNs,
what are the reducing
agents and oxidizing
agents and what has
been oxidized or
reduced?

11. 1)Zn(s)+CuO
ZnO(s)+Cu(s)
2)Fe2O3(s)+3CO(g)
2Fe(s)+3CO2(g)
3)Mg(s)+H2O
MgO(s)+H2(g)

13.  https://www.youtube.com/watch?v=glq
ZlISuyJk&feature=youtube_gdata_player