1. TOPIC – SOLUTIONS AND SUSPENSION WORKSHEET ANSWERS
SECTION A
1. A 2. A 3. D 4. C 5. B
6. A 7. A 8. D 9. D 10. C
11. B 12. A 13. B 14. A 15. B
SECTION B
1) (a) The substance that is dissolved.
(b) The substance that dissolves the solute and forms the bulk of the solution.
2) (a) solute – carbon dioxide, sugar ; solvent – water
(b) Solute – iodine; solvent – alcohol
(c) Solute – alcohol, sugar; solvent – water
3) (a) Increasing temperature
(b) Increasing surface area
(c) Stirring
4) Homogenous; suspension; solvent; solute
5) B. The rate of dissolving increases when surface area increases (coffee
powder), and when temperature is raised (heat). This is in addition to the
stirring present in both experiments, which also aids dissolving.
SECTION C
1) (a) Similar mugs, the same nature of the solutes (sugar) and the same
amount of sugar.
(b) A cube of sugar is used in one mug, whereas a teaspoon (of the same
amount) of sugar is used in the other mug.
(c) Stirring and heating
(d) The teaspoon of sugar will dissolve faster in the mug.
(e) The sugar granules are finer than the cube and so, have a larger surface
area.
2) (a) The beaker of iodine is dark brown and homogenous in colour, as the
iodine crustals dissolve in the beaker of alcohol. On the other hand, the other
beaker of chalk mixture resembles that of a suspension. It is cloudy and
heterogeneous in nature.
(b) The chalk mixture is a suspension if the particles present can be
separated by filtration.
(c) Alcohol is used as a solvent to make aftershaves.