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.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, often involving energy changes such as heat or light.

Front

Give an example of a physical change.

Back

Melting ice is an example of a physical change.

Front

Give an example of a chemical change.

Back

Burning wood is an example of a chemical change.

Front

What happens to energy during a chemical change?

Back

Energy can change forms, such as heat or light being released or absorbed.

Front

How can you increase the rate of a chemical reaction?

Back

You can increase the rate of a chemical reaction by increasing the temperature, increasing the concentration of reactants, or increasing the surface area of solid reactants.

Front

What is the difference between physical and chemical changes?

Back

Physical changes do not alter the chemical composition of a substance, while chemical changes do.

Front

What is an indicator of a chemical change?

Back

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

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.