19/06/2025
BGCSE CHEMISTRY REVISION: REDUCTION AND OXIDATION(PART ONE)
1. Define the .(1 mark)
B. Reduction.(1 mark)
2. State the rules applied to find the oxidation number of an element in a molecule.(8 marks)
3. What do you understand by the term oxidation number?(1 mark)
4. a. Find the oxidation number of sulphur in sulphate (SO²4).(3 marks)
b. Find the oxidation number of Nitrogen in NH4^+(Ammonium).(3 marks)
c. Work out the oxidation number of:
I. Mn(Manganese) in MnO-4
Ii. Sulphur in SO2
5. What is an oxidation state?(1 mark)
6. State the rules for balancing redox reactions.(5 marks)
7. Distinguish between oxidising and reducing agent.(4 marks)
8. Balance the following redox equations:
a. Al(s) + Ag^+(aq)-------> Al³+((aq) + Ag(s). (5 marks)
b. Zn(s) + Fe³+(aq)----------> Zn²+(aq) + Fe(s). (5 marks)
9. State the 3 criteria for the order of reactivity of metals.(3 marks)
10. Describe an experiment to investigate how metals react with water (10 marks)
11. Describe the electrochemical series.(3 marks)
12. What is a displacement serie?(1 mark)
13. Write down the metals in the reactivity series from the most reactive metals to least reactive metals.(7 marks)
14. Describe an experiment to investigate the displacement reaction of metals.(10 marks)
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Next will be *REDUCTION AND OXIDATION (PART 2)
