Physical and Chemical Changes Review

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 changes in state (like melting or freezing) and changes in shape.

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 is usually not reversible. Examples include rusting iron and cooking an egg.

Front

What evidence indicates a chemical change has occurred?

Back

Evidence of a chemical change includes color change, temperature change, gas production, and the formation of a precipitate.

Front

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

Back

The properties of a substance may change (like shape or state), but its chemical identity remains the same.

Front

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

Back

The properties of a substance change, and a new substance is formed with different chemical properties.

Front

What is an example of a physical change?

Back

An example of a physical change is ice melting into water.

Front

What is an example of a chemical change?

Back

An example of a chemical change is baking a cake, where ingredients react to form a new product.

Front

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

Back

A physical change does not change the chemical composition of a substance, while a chemical change results in new substances being formed.

Front

What is the process of boiling?

Back

Boiling is a physical change where a liquid turns into vapor when heat is added, causing the molecules to move quickly.

Front

What is freezing?

Back

Freezing is a physical change where a liquid turns into a solid as heat is removed.