Physical and Chemical Changes

Front

What is a chemical change?

Back

A chemical change is a change in which a substance transforms into a different substance, resulting in the formation of new chemical properties, often accompanied by the release of light or heat.

Front

Give an example of a chemical change.

Back

An example of a chemical change is wood burning, which produces ash, smoke, and gases.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

Provide an example of a physical change.

Back

Bending metal is an example of a physical change.

Front

What happens to paper when it is crumpled?

Back

Crumpling paper is a physical change; the paper's shape changes, but its chemical composition remains the same.

Front

Identify the type of change when glass breaks.

Back

The breaking of glass is a physical change.

Front

What are some indicators of a chemical change?

Back

Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

Front

Can a physical change be reversed?

Back

Many physical changes can be reversed, such as melting and freezing, but some may not be easily reversible.

Front

What is the difference between a physical and a chemical change?

Back

The main difference is that a physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

Front

Is dissolving sugar in water a physical or chemical change?

Back

Dissolving sugar in water is a physical change because the sugar can be recovered by evaporating the water.