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1
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
2
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?
………………………………………………………………….
3
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-
4
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