Set A S2 Science Section Quiz (Section 9.
3)
Unit 9: Acids and Alkalis Set A
S2 Science
Unit 9 — Section Quiz
Section 9.3
Name: ___________________________ ( ) Class: _________ Date: _____________
Total marks: 20 marks
Time allowed: 15 minutes Score: / 20
Answer ALL questions.
Part A True or false (3 marks; 1 mark each)
Write ‘T’ for a true statement and ‘F’ for a false statement.
1. Some hair conditioners contain a mild acid to make the hair easier to comb by
neutralizing an alkaline shampoo.
2. We can use pH sensor with a data-logger to monitor the change in pH value of a
solution during an experiment.
3. Mass is not conserved in neutralization.
Part B Fill in the blanks (4 marks; 1 mark each)
Fill in each blank with no more than two words. Write your answers in the boxes provided.
1. To treat insect stings and bites, apply acidic substances (e.g. (a) ) or
alkaline substances (e.g. (b) ) to the affected area.
2. To reduce water pollution, acidic wastes from factories are treated with alkalis
(e.g. (c) ), and alkaline wastes are treated with acids (e.g. (d) ) before
they are discharged.
Answers:
(a) (b)
(c) (d)
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S2 Science Section Quiz (Section 9.3)
Unit 9: Acids and Alkalis Set A
Part C Questions (13 marks)
1. (a) Our stomach produces an acid to help us digest food. What kind of acid
does our stomach produce? (1 mark)
E (b) Sometimes our stomach may produce too much acid. We can use antacids to
neutralize the excess acid. Some antacids contain aluminium hydroxide
which is an alkali.
Write the word equation for the reaction of aluminium hydroxide and the
acid in the stomach. (2 marks)
2. Salt is produced during neutralization.
(a) State how to test for the salt produced and the expected observation.
(2 marks)
(b) Apart from salt, what else is/are produced or released during neutralization?
(2 marks)
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S2 Science Section Quiz (Section 9.3)
Unit 9: Acids and Alkalis Set A
E 3. For each of the following neutralization reactions,
(i) write the word equation; and
(ii) state ONE use of the salt produced.
(a) The neutralization of sulphuric acid and calcium hydroxide
(i) Word equation (2 marks)
(ii) Use (1 mark)
(b) The neutralization of nitric acid and potassium hydroxide
(i) Word equation (2 marks)
(ii) Use (1 mark)
-END-
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Set A S2 Science Section Quiz (Section 9.3)
Unit 9: Acids and Alkalis Set A
ANSWERS
Unit 9 — Section Quiz
Section 9.3
Part A True or false (3 marks; 1 mark each)
1. T 2. T 3. F
Part B Fill in the blanks (4 marks; 1 mark each)
(a) vinegar (Or any other reasonable answers)
(b) soap / baking soda (Or any other reasonable answers)
(c) calcium hydroxide / slaked lime (Or any other reasonable answers)
(d) sulphuric acid (Or any other reasonable answers)
Part C Questions (13 marks)
1. (a) Hydrochloric acid (1m)
(b) hydrochloric acid + aluminium hydroxide → aluminium chloride + water
Correct reactants (1m)
Correct products (1m)
2. (a) Evaporate the neutralized solution to dryness. (1m)
A white solid will be left on the watch glass. (1m)
(b) Water is produced and (1m)
heat is released during neutralization. (1m)
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S2 Science Section Quiz (Section 9.3)
Unit 9: Acids and Alkalis Set A
3. (a) (i) sulphuric acid + calcium hydroxide → calcium sulphate + water
Correct reactants (1m)
Correct products (1m)
(ii) Making tofu (1m)
(b) (i) nitric acid + potassium hydroxide → potassium nitrate + water
Correct reactants (1m)
Correct products (1m)
(ii) Making fertilizers (1m)
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