Workbook Answers: Ch10 Integrated Exercise

Integrated Exercise
A. Concept checking p.45
1. True
2. False
3. True
8. False
9. True
10. False

B. Multiple choice p.45
1. C
2. B
3. B
4. C
5. A
7. A
8. D

C. Questions p.48
1. (a) Solution A: vinegar
Solution B: rainwater
Solution C: soap solution
Solution D: lime water
(b) Its pH value may be between 8.8 and 12.3.

2. (a) Indicators P and T
(b) Indicators Q and R are blue in ammonia.
(c) Indicator Q is yellow in both acids. Indicator S is colourless in both acids.
(d) Indicator P is yellow in ethanoic acid and in sodium hydroxide.
(e) Indicator P is red in a solution with a pH value equal to or less than 2. Indicator T is yellow
                in a solution with a pH value in between 2 and 8. If a solution looks red after adding
                indicator P and yellow after adding indicator T, it means that the solution has a pH value
                of about 2.

3. (a) Red
(b) Concentrated hydrochloric acid gives off an acidic vapour. The acidic vapour dissolves in
                the water in the moist blue litmus paper and turns the litmus paper red.

4. (a) Colourless gas bubbles are given out.
(b) (i) The lime water turns milky.
(ii) The gas released in the reaction is carbon dioxide.
(c) Marble / calcium carbonate / other carbonates