P3-multiplication

1. 53x9=
2. 64x6=
3. 17x7=
4. 59x3=
5. 29x4=
6. 83x3=
7. 53x8=
8. 37x6=
9. 73x2=
10.67x6=
11.84x4=
12.68x5=
13.96x7=
14.62x9=
15. 72x8=

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?