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SS1: CHEMISTRY - 3RD TERM

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  1. Carbon and its Compounds I | Week 1
    6 Topics
    |
    1 Quiz
  2. Carbon and its Compounds II | Week 2
    5 Topics
    |
    1 Quiz
  3. Carbon and its Compounds III | Week 3
    7 Topics
    |
    1 Quiz
  4. Carbon and its Compounds IV | Week 4
    5 Topics
    |
    1 Quiz
  5. Carbon and its Compounds V | Week 5 & 6
    8 Topics
    |
    1 Quiz
  6. Industrial Chemistry / Chemistry Industry 1 | Week 7 & 8
    4 Topics
    |
    1 Quiz
  7. Chemical Industry and Biotechnology | Week 9
    4 Topics
    |
    1 Quiz



Lesson 2, Topic 5
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SS1: Chemistry: Theory Questions – Carbon & Its Compounds II

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Topic Content:

  • Theory Questions & Answers – Carbon & Its Compounds II

Carbon & Its Compounds II: Theory Questions

1.

(a) Use a well-balanced equation to show the reducing property of carbon.

(b) State ONE piece of evidence to show that both graphite and diamond are allotropes of carbon.

(c) State with reasons why it is not safe to keep the engine of a motor car running for a prolonged period in a closed garage.

2. Name the FOUR products of destructive distillation of coal and its uses.

3. (a) Name two fuels from coke.
(b) Give the components of each fuel mentioned in 3(a) above.
(c) Which fuel is more preferred and why?

4. Using a well-balanced equation, state how carbon combines with the following elements;
(a) S 
(b) H2 
(c) Al 
(d) Ca  

 

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Evaluation Questions

1(a) Use a well-balanced equation to show the reducing property of carbon

Answer:  Carbon reduces metallic oxides to their metals. E.g.

  1. 3C(s) + Fe2O3(s)   →  3CO(s) + 2Fe(s)
  2. C(s) + 2PbO(s)  →  CO2(g) + 2Pb(s).

 

(b) State ONE piece of evidence to show that both graphite and diamond are allotropes of carbon

Answer: Coal diamond and graphite can be proved allotropes of carbon by burning them in the presence of oxygen then only carbon dioxide gas is evolved and no residue is left.

 

(c) State with reasons why it is not safe to keep the engine of a motor car running for a prolonged period in a closed garage.

Answer:  The fumes produced by the engine via the exhaust pipe of a motor car are poisonous. A closed garage prevents cross-ventilation or free circulation of air.

 

2. Name the FOUR products of destructive distillation of coal and its uses

Answer:

(i) Coaltar: It is used in the synthesis of some commercial products such as dyes, paints, plastics and explosives

(ii) Coke: It is used as both industrial and domestic fuel.

(iii) Ammoniacal liquor: It is used in the manufacture of ammonium tetraoxosulphate (VI) which is extensively used as a fertilizer.

(iv) Coal gas: It is used in industries as domestic fuel.

 

3(a) Name two fuels from coke.

Answer:

(i) Producer gas

(ii) Water gas

 

(b) Give the components of each fuel mentioned in 3(a) above.

Answer:

i. Producer gas – Carbon (II) oxide and Nitrogen

ii. Water-gas – Carbon (II) oxide and Hydrogen

 

(c) Which fuel is more preferred and why?

Answer:  Water gas is more preferred because it consists of hydrogen and carbon (II) oxide which are combustible unlike producer gas, which consists of non-combustible products.

 

4. Using a well-balanced equation, state how carbon combines with the following elements 

(a) S

Answer – C(s) + 2S(s)  CS2

 (b) H2

Answer – C(s) + 2H2(g)  CH4(g)

 (c) Al

Answer – 3C(s) + 4Al(s) Al4C3

 (d) Ca 

Answer – 3C(s) + Ca(s) →  CaC3