chemistry

Question 1

matter

Answer 1

anything that has mass and occupies space

Question 2

4 main idea of the particulate theory

Answer 2

all matter is made up of particles called atoms

atoms are in constant movement

atoms have an attraction to each other

atoms are spaced apart

Question 3

states of matter

Answer 3

solid, liquid and gas

Question 4

diffusion

Answer 4

process resulting from random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration

Question 5

osmosis

Answer 5

The movement of water molecules from a region with a lot of water molecules to a region with fewer water molecules

Question 6

uses of salt and sugar to control garden pests and preserve food items

Answer 6

salt kills slugs and snails

sugar can be used to attract ants to trap them

salt can be used to preserve, meat, fish, poultry and vegetables

sugar can preserve fruits and veges and other ‘sweet foods’

Question 7

melting

Answer 7

the process of a solid changing into a liquid

Question 8

evaporation

Answer 8

the process of a liquid changing into a gas

Question 9

boiling

Answer 9

a type of evaportion which happens when liquid reaches its boiling point.

Question 10

condensation

Answer 10

process by which a gas changes into a liquid

Question 11

freezing

Answer 11

the process by which a liquid changes into a solid

Question 12

sublimation

Answer 12

the process by which a solid changes directly into a gas eg. dry ice