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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

Quizzes




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Chemical Industry: Theory Questions

1. (a) Name three common natural raw materials and their sources.
(b) Name a raw material used for each of the following products
(i) margarine 
(ii) glass 
(iii) paint 
(iv) cement

2. (a) Mention three types of chemical industries.
(b) Name Four heavy chemicals and state the reasons why they are called heavy chemicals.
(c) Name Four fine chemicals and state the reasons why they are called fine chemicals.

3. (a) Name the major raw material used in the large-scale  production of each of the following:
(i) glass
(ii) iron
(iii) tyre

(b) Alaxin (C5H8)nO5, is a new drug for the treatment of malaria. Determine the molecular formula of alaxin. If its relative molecular mass is 284. [H = 1, C = 12, O = 16]

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Chemical Industry 1 – Evaluation Questions

1 (a) Name three common natural raw materials and their sources.

Answer:

(i) Coal.

(ii) Petroleum/crude oil.

(iii) Air.

(b) Name a raw material used for each of the following products.

Answer:

(i) Margarine – vegetable oils such as palm, sunflower, rapeseed and soya bean oils.

(ii) Glass – Silicon (IV) oxide.

(iii) Paint – Oxides of lead.

(iv) Cement – Limestone.

 

2(a) Mention three types of chemical industries.

Answer:

(i) Food and beverages Industry.

(ii) Glass Industry.

(iii) Cement Industry.

 

(b) Name Four heavy chemicals and state the reasons why they are called heavy chemicals.

Answer:

(i) Trioxonitrate (V) acid.

(ii) Tetraoxosulphate (VI) acid.

(iii) Sodium hydroxide.

(iv) Sodium trioxocarbonate (IV).

They are called heavy chemicals because of their production in very large quantities due to popular/high demand.

 

(c) Name Four fine chemicals and state the reasons why they are called fine chemicals.

Answer:

(i) drugs.

(ii) perfumes.

(iii) dyes.

(iv) cosmetics.

These are called fine chemicals because they are manufactured in relatively small quantities and have higher purity than heavy chemicals.

 

3(a) Name the major raw material used in the large-scale  production of each of the following:

Answer:

(i) Glass Silicon (IV) oxide, sodium trioxocarbonate (IV), limestone and lime.

(ii) Iron – metals are usually extracted from their ores.

(iii) Tyre –  rubber (natural or synthetic), carbon black, nylon tyre cord and rubber chemicals.

(b) Alaxin (C5H8)nO5, is a new drug for the treatment of malaria. Determine the molecular formula of alaxin. If its relative molecular mass is 284. [H = 1, C = 12, O = 16]

Answer:

(C5H8)nO5

R.m.m = 284

(Empirical formula) n = Molecular formula
(C5H8)nO5 = 284 ……… (i)
[(12*5) + (1*8)]n + (16*5) = 284
(60 + 8)n + 80 = 284
68n + 80 = 284
68n = 284 – 80 = 204
n = \( \frac{204}{68} \)

n = 3

Substitute for n = 3 in equation (i)
(C5H8)3O5
C15H24O5

Therefore, the molecular formula = C15H24O5

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