Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without changing its chemical composition. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include rusting, burning, and souring of milk.

Front

In which state of matter do particles move the slowest?

Back

Solid.

Front

What happens to the particles of a substance when it is heated?

Back

The particles gain energy and move faster.

Front

What is evidence of a physical change?

Back

Shape change.

Front

What is evidence of a chemical change?

Back

Formation of a new substance, color change, gas production, or temperature change.

Front

What happens to butter when it is heated?

Back

More energy is added, causing it to change state from solid to liquid.

Front

What is an example of a physical change?

Back

Melting ice.

Front

What is an example of a chemical change?

Back

Milk going sour.

Front

What happens to an iron chain exposed to air and rain?

Back

It may rust, which is a chemical change.