Physical vs. Chemical Change

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. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and includes processes like burning, rusting, and cooking.

Front

What is a sign that a chemical reaction has occurred?

Back

Signs of a chemical reaction include the formation of a gas, a change in color, the formation of a precipitate, and a change in temperature.

Front

Is melting butter for popcorn a chemical or physical change?

Back

Melting butter for popcorn is a physical change because it does not change the chemical composition of the butter.

Front

What is a result of a chemical change?

Back

A result of a chemical change is the formation of a new substance.

Front

What is a result of a physical change?

Back

A result of a physical change can be a solution, which is a homogeneous mixture of two or more substances.

Front

True or False: Change in density is a physical change.

Back

True. Change in density is a physical change because it does not involve a change in the chemical composition of the substance.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the arrangement of molecules may change, but the molecules themselves remain the same.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the bonds between molecules break and new bonds form, resulting in the creation of new substances.

Front

Give an example of a physical change.

Back

An example of a physical change is ice melting into water.