Unit 3 | Chemical and Physical Changes

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties.

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 evidence indicates a chemical change has occurred?

Back

Evidence of a chemical change includes the formation of a gas, a change in color, the formation of a precipitate (solid), or a change in temperature.

Front

What happens to water when it freezes?

Back

When water freezes, heat is removed, and it changes from a liquid to a solid.

Front

What happens to ice cubes when they melt?

Back

Ice cubes absorb heat from their surroundings when they melt.

Front

What is an example of a physical change?

Back

Cutting a banana into pieces is an example of a physical change.

Front

What is an example of a chemical change?

Back

Bananas turning brown is an example of a chemical 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 difference between a chemical change and a physical change?

Back

A chemical change results in the formation of new substances, while a physical change does not change the chemical identity of a substance.

Front

What is an example of a chemical change in everyday life?

Back

Rust forming on iron is an example of a chemical change.