states of matter

Question 1

which materials on earth are placed in 3 groups

Answer 1

solids, liquids and gas

Question 2

property of a solid?

Answer 2

• have a fixed shape, cannot flow
• they have particles which cannot move from place to place
• they cannot be compressed or squashed

Question 3

examples of solid

Answer 3

steel, plastic, wood are solids at room temperature

ice is a solid water

Question 4

particles in a solid have the following charactertics

Answer 4

• they are close together
• have a regular pattern
• held together by strong forces called bonds
• cannot move from place to place

Question 5

properties of gases?

Answer 5

they flow and completely fill their container
(why - because the particles can move quickly in all directions)
they can be compressed or squashed (why: because particles are far apart and have space to move into)

Question 6

examples of gases:

Answer 6

air, helium, chlorine are gases at room temperature

water vapour is water as a gas

Question 7

particles in gas:

Answer 7

• far apart

- arranged in a random way

Question 8

particles in a gas can:

Answer 8

move quickly in all directions

Question 9

properties of liquid:

Answer 9

• they flow and take the shape of their container
• (why: the particles can move around each other)
• they cannot be compressed or squashed (why: the particles are close togetther and have no space to move)

Question 10

examples of liquid:

Answer 10

• mercury, lemonade, water are liquids at room temperature

- particles in a liquid are close together and arranged in a random way, and can move around each other

Question 11

what is matter?

Answer 11

is the scientific word used to describe all the different substances and materials found on the earth

Question 12

what does raising the temperature cause?

Answer 12

• it causes the solids to change to liquids
• liquids to change to gases
• cooling a gas will eventually change into liquid
• if cooling is continued, this will change solid in to

Question 13

temperature at sea level?

Answer 13

boils upto 100 c

Question 14

thermal energy?

Answer 14

solids that are metals are good at transferring thermal energy. We say they are good conductors

Question 15

what are all materials made up of?

Answer 15

they are made of tiny particles called atoms

Question 16

freezing

Answer 16

is the opposite of melting. it is when liquid becomes a solid as the temperature lowers

Question 17

condensing

Answer 17

is the opposite of boiling. it is when a gas becomes a liquid as the temperature lowers