Yr 8 Chemistry revision (Australia)

Substances that take the shape of their container and take up a fixed amount of space are known as

• solidsl

• liquids

• gases

• fluids

Diffusion occurs when

• a burning fuse is put out

• a bomb is deactivated

• a gas spreads through all available space

• a solid or liquid turns into a gas

The change of state from liquid to gas is known as

• melting

• freezing

• evaporation

• sublimation

Pure water is

• liquid at 10 degrees Celsius and solid at 60 degrees Celsius

• liquid at 125 degrees Celsius and gas at 10 degrees Celsius

• solid at -10 degrees Celsius and gas at 45 degrees Celsius

• solid at -25 degrees Celsius and liquid at 60 degrees Celsius

As the temperature of a substance increases, its particles

• move faster

• move more slowly

• move at the same speed but further apart

• stick together more

Which of these lists gives the states of matter in order from 'generally contain the closest packed particles' to 'generally contain the most spread out particles'?

• Gas, liquid, solid

• Liquid, solid, gas

• Solid, gas, liquid

• Solid, liquid, gas

A substance changes state from a liquid into a solid when

• energy is gained by its particles

• energy is lost by its particles

• its particles move more slowly

• its particles spread out further

TRUE or FALSE?

Most solids have a fixed shape

• TRUE

• FALSE

TRUE or FALSE?

Liquids can take any shape

• TRUE

• FALSE

TRUE or FALSE?

Gases have a fixed volume

• TRUE

• FALSE