Identify Chemical and Physical Changes

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances, often indicated by changes in color, temperature, or the formation of gas or precipitate.

Front

What is a physical change?

Back

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

Front

What indicates a chemical change has occurred?

Back

Indicators include changes in color, temperature, the formation of gas, or the formation of a precipitate.

Front

What is a precipitate?

Back

A solid that forms out of a solution when two liquids are mixed together.

Front

Give an example of a chemical change.

Back

Rust forming on iron when it reacts with oxygen and moisture.

Front

Give an example of a physical change.

Back

Melting ice into water.

Front

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

Back

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

Front

What does it mean if a change is reversible?

Back

It means that the substance can return to its original state after the change.

Front

What is an indicator of a physical change?

Back

A change in state, such as melting or freezing, without forming a new substance.

Front

What happens to the energy during a chemical change?

Back

Energy is either absorbed or released during a chemical change.