Physical & Chemical Changes

Front

What is a physical change?

Back

A physical change alters the physical properties of a substance without changing its chemical composition, meaning no new substance is formed.

Front

What is a chemical change?

Back

A chemical change involves a transformation that alters the chemical composition of a substance, resulting in the formation of one or more new substances.

Front

Give an example of a physical change.

Back

Melting ice is an example of a physical change, as it changes from solid to liquid without altering its chemical structure.

Front

Give an example of a chemical change.

Back

Burning wood is an example of a chemical change, as it transforms the wood into ash and gases, creating new substances.

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

What are some indicators of a physical change?

Back

Indicators of a physical change include changes in state (solid, liquid, gas), shape, size, or texture without altering the substance's chemical identity.

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.

Front

Can a chemical change be reversed?

Back

Chemical changes are often not reversible by simple physical means, as they involve the formation of new substances.

Front

What happens to the mass of a substance during a physical change?

Back

The mass of a substance remains the same during a physical change, as no new substances are created.

Front

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

Back

The mass of a substance is conserved during a chemical change, but it may appear to change due to the formation of new substances.