Chemical and Physical Changes in Matter

Front

What is a heterogeneous mixture?

Back

A mixture that is not evenly distributed, where different components can be seen and separated.

Front

What is a homogeneous mixture?

Back

A mixture that is evenly distributed, where the different components are not distinguishable.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is an example of a chemical change?

Back

Burning wood, which produces ash and smoke.

Front

What is an example of a physical change?

Back

Melting ice, which changes from solid to liquid but remains water.

Front

What evidence indicates a chemical change has occurred?

Back

Color change, gas production, temperature change, or light production.

Front

What is the significance of gas formation in a reaction?

Back

It often indicates that a chemical change has occurred.

Front

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

Back

The properties change as new substances are formed.

Front

What is the role of observation in identifying chemical changes?

Back

Observations such as color change, gas formation, or temperature change help identify chemical changes.