Physical and Chemical Changes

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 cutting.

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 baking.

Front

Is cutting a log into small pieces a chemical change?

Back

No, cutting a log into small pieces is a physical change.

Front

What are some signs that a chemical reaction has occurred?

Back

Signs of a chemical reaction include the formation of gas, color change, temperature change, and the production of light.

Front

What does fizzing indicate in a reaction?

Back

Fizzing is often a sign of a chemical change, indicating that a gas is being produced.

Front

Is rust on an iron bar a chemical change?

Back

Yes, rusting is a chemical change because it involves the reaction of iron with oxygen to form iron oxide.

Front

What is an example of a chemical reaction?

Back

Baking cookies is an example of a chemical reaction, as it involves the transformation of ingredients into a new product.

Front

What happens during a physical change?

Back

During a physical change, the form of a substance changes, but its chemical identity remains the same.

Front

Can a physical change be reversed?

Back

Many physical changes can be reversed, such as freezing and melting water.

Front

What is an example of a physical change?

Back

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