Worksheet Chapter 5: Water and Solution

1. True or False: Electrolysis of water yields twice as much volume of Oxygen gas as Hydrogen gas.

2. State TWO physical differences between a solution and a suspension.

3. Explain how the rate of stirring affects the solubility rate of a solute in water.

4. State FOUR environmental factors that affect the rate of water evaporation.

5. Fill in the blank: The physical process in which a liquid turns into water vapor at any temperature below its boiling point is called ________.

6. Describe the roles played by (a) Alum, (b) Slaked Lime, (c) Chlorine, and (d) Fluoride in a municipal water purification plant.

7. Which organic solvent is used to dissolve paint and varnish stains?

8. An experiment is set up to perform the electrolysis of water using dilute sulphuric acid as an electrolyte. (a) State the gas collected at the cathode and describe its confirmatory test. (b) State the gas collected at the anode and describe its confirmatory test.

9. A student dissolves salt into a beaker of pure water until no more salt dissolves and excess salt settles at the bottom. (a) What type of solution is formed? (b) Suggest TWO ways to make the excess salt dissolve.

10. True or False: Distillation is the only water purification method that yields pure water free from dissolved minerals.