Chemical and Physical Changes

Front

What is a physical change?

Back

A change where the characteristics do not change the substance, such as melting ice or dissolving sugar in water.

Front

What is a chemical change?

Back

A change where the chemical makeup of a substance changes, resulting in the formation of new substances, such as rusting iron or burning wood.

Front

Give an example of a physical change.

Back

Melting ice or breaking a glass.

Front

Give an example of a chemical change.

Back

Baking a cake or combining baking soda and vinegar.

Front

What happens to the substances in a physical change?

Back

The substances retain their original properties and can often be reversed.

Front

What happens to the substances in a chemical change?

Back

The substances lose their original properties and cannot be easily reversed.

Front

What is the product in the chemical equation Na + Cl -> NaCl?

Back

NaCl (sodium chloride or table salt).

Front

What is an indicator of a chemical change?

Back

Production of gas, change in color, formation of a precipitate, or change in temperature.

Front

What is an example of a reversible physical change?

Back

Freezing and melting of water.

Front

What is an example of an irreversible chemical change?

Back

Burning paper.