Chemical and Physical changes

Front

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

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of one or more new substances with different properties.

Front

Give an example of a physical change.

Back

Bending a metal rod is an example of a physical change.

Front

Give an example of a chemical change.

Back

Rust forming on a bike is an example of a chemical change.

Front

What happens to the chemical composition of a substance during a chemical change?

Back

The chemical composition of a substance changes during a chemical change, resulting in new substances.

Front

What is a common indicator of a chemical change?

Back

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

Front

Is melting ice a physical or chemical change?

Back

Melting ice is a physical change.

Front

Is burning wood a physical or chemical change?

Back

Burning wood is a chemical change.

Front

What is meant by the term 'reactants' in a chemical reaction?

Back

Reactants are the starting substances that undergo a chemical change to form products.

Front

What are 'products' in a chemical reaction?

Back

Products are the substances formed as a result of a chemical reaction.

Front

Can a physical change be reversed?

Back

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