P5 - Science

1. Why is the water cycle important?
2. Name 3 ways to reduce the use of water.
3. What are the 3 main causes of water pollution?
4. Is there a gain of heat or loss of heat in the following processes?
(a) condensation
(b) evaporation
(c) boiling
(d) freezing
(e) melting
5. What is the boiling point of water?
6. What is the freezing point of water?
7. What is the change in state when water evaporates?
8. What is the change in state when ice melts?
9. What is the change in state when water freezes?
10. List 3 ways in which an ice cube is different from water vapour?
11. What is observed when water boils?
12. Does pure water or sea water boil at a higher temperature?