Topic 2: Changes in Matter Review Part 1

Front

What is a physical change?

Back

A physical change alters the form or appearance of matter without changing its chemical composition.

Front

What is a chemical change?

Back

A chemical change results in the formation of new substances with different properties.

Front

What evidence might indicate a chemical change?

Back

Evidence of a chemical change includes release of heat, new smell, color change, and formation of gas.

Front

What evidence might NOT indicate a chemical change?

Back

A change in temperature alone does not indicate a chemical change.

Front

What happens to the mass of an object when it undergoes a physical change?

Back

The mass remains the same before and after the change.

Front

What happens to the mass of an object when it undergoes a chemical change?

Back

The mass remains the same before and after the change, according to the law of conservation of mass.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change.

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change.

Front

What is the law of conservation of mass?

Back

The law states that mass cannot be created or destroyed in a chemical reaction.

Front

What is a gas?

Back

A gas is a state of matter that has no fixed shape and can flow to fill its container.