Chemical and physical 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 altering 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. It involves a chemical reaction and changes the chemical composition of the substance. Examples include burning, rusting, and cooking.

Front

Is melting ice a physical or chemical change?

Back

Melting ice is a physical change because it changes from solid to liquid without altering its chemical composition.

Front

Is burning wood a physical or chemical change?

Back

Burning wood is a chemical change because it transforms the wood into ash and gases, creating new substances.

Front

What happens during a physical change?

Back

During a physical change, the form or appearance of a substance changes, but its chemical identity remains the same.

Front

What happens during a chemical change?

Back

During a chemical change, the substances involved undergo a chemical reaction, resulting in the formation of new substances with different properties.

Front

Give an example of a physical change.

Back

An example of a physical change is shredding paper.

Front

Give an example of a chemical change.

Back

An example of a chemical change is striking a match.

Front

What is the difference between a physical change 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 does.

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.