Chemical vs. Physical Changes

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new substances. Examples include burning, rusting, and cooking.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without changing its chemical composition. Examples include melting, freezing, and dissolving.

Front

What happens to the substances in a chemical change?

Back

In a chemical change, the original substances are transformed into different substances with new properties.

Front

What happens to the substances in a physical change?

Back

In a physical change, the original substances remain the same, even if their form or appearance changes.

Front

Can you give an example of a chemical change?

Back

An example of a chemical change is burning wood, which produces ash and smoke.

Front

Can you give an example of a physical change?

Back

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

Front

What is the role of oxygen in burning?

Back

Oxygen is necessary for burning; it reacts with the material to produce heat and light.

Front

What is carbon dioxide?

Back

Carbon dioxide is a gas produced when substances burn, and it can cause flames to go out.

Front

What is an indicator of a chemical change?

Back

An indicator of a chemical change can be a change in color, temperature, or the production of gas.

Front

What is an indicator of a physical change?

Back

An indicator of a physical change is a change in state, such as solid to liquid, without new substances forming.