Properties and Changes of Materials MC5.2

What is a reversible change?

• Something that cannot be changed back into its original form

• Something that can be changed back into its original form

• Something that can be turned into something new

What is an irreversible change?

• Something that can be changed back into its original form

• Something that cannot be changed back into its original form

• Something that has been changed into something never seen before

Select the reversible change

• Boiling an egg

• Baking a cake batter

• Melting a chocolate bar

Select an irreversible change

• Freezing water to make ice

• Boiling water and creating steam

• Mixing flour in water

Is freezing something a reversible or an irreversible change?

• Reversible

• Irreversible

Is boiling pasta a reversible or irreversible change?

• Reversible

• Irreversible

Some children put some sugar cubes into a cup of tea.  They watch as the sugar cubes seem to disappear.  What happened to them?

• they melted
• they evaporated
• they dissolved
• they became a gas

Found in outer space and comes from the stars.

• solid
• liquid
• gas
• plasma

Solid changing to a liquid.

• melting
• freezing
• evaporation
• condensation

Gas changes to a liquid.

• melting
• freezing
• condensation
• evaporation