Physical and chemical changes

Students observed a piece of iron change from shiny to rusty. What caused this change?

• a chemical reaction

• a heat reaction

• a cold reaction

• a physical reaction

Which is the best example of a new substance forming?

• lighting a match

• cutting a piece of paper

• popping a balloon

• hitting a nail with a hammer

Which is an example of a different substance being formed?

• glass breaking

• metal melting

• water freezing

• wood burning

Bending metal

• Physical Change

• Chemical Change

Boiling Water

• Physical Change

• Chemical Change

Dissolving Sugar

• Physical Change

• Chemical Change

A Candle Burning

• Physical Change

• Chemical Change

Nail Rusting

• Physical Change

• Chemical Change

A chemical change is a change in

• an item's properties such as size, shape, density

• an item that creates a new substance, releases light or heat

• an item's sound

• an item's look or state of matter

A physical change is a change

• in an item's properties like its shape, size or density.

• that creates a new substance or emits light or heat

• that creates a smell

• that cannot be undone