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DEFINITIONS FOR OXIDATION AND REDUCTION OXIDISING AND REDUCING AGENTS OXIDATION NUMBER NAMING OF COMPOUNDS USING IUPAC NOMENCLATURE

NAME………………………………………………CLASS………..TEACHER……

RUSTING IS A REDOX REACTION

QUESTION 1

What is meant by REDOX reaction?

……………………………………………………………………………………..

………………………………………………………………………………………

QUESTION 2

What is meant by oxidation and reduction?

Oxidation and reduction could be defined from 4 different angles . Fill in the table below

Oxidation reaction Reduction Reactiona) Oxygen gain or

oxygen loss

b) Hydrogen gain or hydrogen loss

c) electron transfer

d) changes in oxidation number

QUESTION 3. Choose the best answer for statements below

A) Definition of REDOX involving oxygen gain or oxygen loss

2Mg + CO2 2MgO + C

i) Magnesium undergoes oxidation/reduction reaction because magnesium has gain/lost oxygen

ii) Carbon undergoes oxidation/reduction reaction because carbon has gain/lost oxygen

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B) Definition of REDOX involving hydrogen gain or hydrogen loss

H2S + F2 S + 2HF

i) Sulphur undergoes oxidation/reduction reaction because Sulphur has gain/lost hydrogen

ii) Fluorine undergoes oxidation/reduction reaction because fluorine has gain/lost hydrogen

C) Definition of REDOX involving electron transfer.

First complete the ion-electron equation belowAnd then identify whether the equations are oxidation or reduction reactions

Ion-electron equations Oxidation or Reduction reactions?

1 example

Mg 2+ +2e Mg2

2O 2- O2

3

Cl 2 2Cl -

4

2H + H2

5

Zn Zn 2+ 6

2Cl - Cl2

D) Definition of REDOX involving changes in oxidation number .

a) What is meant by OXIDATION NUMBER?

………………………………………………………………….

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b) Calculate OXIDATION NUMBER for the underlined below

1 K2Cr2O7 6 MnO4 -

2 SO27 FeCl3

3 Mg 8 H2

4 MgSO49 Br2

5 NO3 – 10 K2SO4

C) Identify the reactions below whether they are oxidation reactions or reduction reactions by calculating the changes in OXIDATION NUMBER

Reactions Changes in oxidation number

Oxidation reaction / reduction reaction or neither?

1

Cu 2+ Cu

2 Br2 2Br-

3 MnO2- Mn 2+

4 IO3 - I 2

5 CrO4 2- Cr2O7 2-

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QUESTION 4

State whether the following reactions are oxidation reactions or reduction reactions based on the 4 definitions of redox reactions

Redox reactions Oxidation reaction / reduction reaction ?

Give reasons for your answers

1 Mg MgO

2 CO2 C

3 H2S S

4 Cl2 HCl

5 NH3 N2

6 CuO Cu

7 Cu 2+ + 2e Cu

8 MnO 4 - Mn 2+

9 2I - I 2

10 FeCl3 FeCl2

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Name compounds below using IUPAC nomenclature

Element formulae Name a) Chromium Cr2O3

b) Copper Cu2O

c) Manganese KMnO4

d) CuO

e) PbO2

e) FeCl3

f) Zinc Zn(NO3)2

Name compounds below using IUPAC nomenclature

elements Formulae Name a) Bromine NaBr

b) Na3PO4

d) NaClO4

e) Chlorine and oxygen

NaClO

f) KNO3

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A) NAMING OF CATIONS USING IUPAC NOMENCLATURE

B) NAMING OF ANIONS USING IUPAC NOMENCLATURE

g) NaS

Choose the best words in the box above to fill in the blanks below

a) AN OXIDIZING AGENT ……………………………………a substance

b) It is ……………………………….in a redox reaction

c) A REDUCING AGENT …………………….. a substance.

d) It is ……………………..in a redox reaction

2FeO + C 2Fe + CO2

Choose the best words in the box above to fill in the blanks below

a) FeO is the ……………………. agent for this reaction.

b) It ………………………carbon into carbon dioxide

c) In the process, FeO itself is ………………………….to Fe

d) C is the ………………………. agent for this reaction.

e) C ………………………FeO into Fe

f) In the process, C itself is ………………………….to CO2

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Oxidized reduced

Oxidized reduced Oxidising Reducing