Science Revision for SA1

P4 Science - Matter
Matter is anything that has mass and occupies space.

A solid
- has a definite shape
- does not take the shape of the container it is put into
- has a definite volume
- cannot be compressed
- does not take the volume of the container it is put into.

A liquid
- does not have a definite shape
- takes the shape of the container it is put into
- has a definite volume
- cannot be compressed
- does not take the volume of the container it is put into.

A gas
- does not have a definite shape
- takes the shape of the container it is put into
- does not have a definite volume
- can be compressed
- takes the volume of the container it is put into.

Water boils at 100 degrees celsius , melts at 0 degrees celsius and freezes at 0 degrees celsius.
Impurities such as salt or sugar can increase the boiling point of water and lower the freezing and melting points of water. Therefore, sea water boils at a temperature above 100 degrees celsius.
When water boils, air in the water escapes in the form of air bubbles. As such, plants and animals cannot survive in boiled water as there is no air in boiled water.
1. What is matter?
2. Name 7 non-matter.
3. What are the 3 states of matter?
4 What are the properties of (a) solids?
(b) liquids?
(c) gases?
5. How is a solid different from a liquid?
6. How is a solid different from a gas?
7. How is a liquid different from a gas?
8. What is the boiling point of water?
9. What is the freezing point of water?
10. What is the change in state when water evaporates?
11. What is the change in state when ice melts?
12. What is the change in state when water freezes?
13. List 3 ways in which an ice cube is different from water vapour?
14. What is observed water boils?
15. Does pure water or sea water boil at a higher temperature?


P5 Science - Water
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?


P6 Science - Energy
1. What is the energy conversion when an apple drops from an apple tree?
2. What are the factors to consider when choosing which material to use to make an item?
3. What is a force?
4. (a) Name a difference between friction and magnetism.
(b) Why is friction important? List as many points as possible.
(c) Why does friction sometimes become a problem?
5. Alex has 2 objects. How can he prove if they are both magnets?
6. Explain the energy conversion that takes place in a power station.
7. When a ball is dropped from a distance above ground, it bounces but not back to the original height where it was dropped.Why?