expansion and contraction

Question 1

what do solids, liquids and gases tend to do when cooled or heated

Answer 1

expand when heated and contract when cooled

Question 2

what is the state of particles of liquids and gases

Answer 2

constant motion

Question 3

what happens when a material is heated

Answer 3

the movement of the particles increases and they move further apart therefore the material expands

Question 4

what happens when a material is cooled

Answer 4

the movement of the particles decreases and the move closer together therefore the material contracts

Question 5

does the size and number of particles change when a material expands or contracts

Answer 5

no, only the spaces between the particles get bigger or smaller

Question 6

during expansion…

Answer 6

the spaces between the particles gets bigger

Question 7

during contraction

Answer 7

the spaces between the particles get smaller

Question 8

why does a gas exert pressure

Answer 8

because of the collisions of the particles with each other against the sides of the container

Question 9

what does pumping more gas into a container do

Answer 9

it increases the number of gas particles in the container