Chemical and Physical 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 cutting, bending, or melting.

Front

What is a chemical change?

Back

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

Front

What happens to paper when it is cut?

Back

Cutting paper is a physical change because the paper's composition remains the same, even though its shape is altered.

Front

What happens when a window is broken?

Back

Breaking a window is a physical change because the glass is still glass, but its shape and structure are altered.

Front

What kind of change is toasting bread?

Back

Toasting bread is a chemical change because it alters the chemical structure of the bread, creating new flavors and textures.

Front

What happens during an explosion of fireworks?

Back

The explosion of fireworks is a chemical change because it involves a rapid reaction that produces new substances, such as gases and light.

Front

What occurs when vinegar and baking soda are mixed?

Back

Mixing vinegar and baking soda is a chemical change because it produces carbon dioxide gas and new substances.

Front

Can physical changes be reversed?

Back

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

Front

Can chemical changes be reversed?

Back

Most chemical changes cannot be easily reversed, as they involve the formation of new substances.

Front

What is an example of a reversible physical change?

Back

An example of a reversible physical change is melting ice into water and then freezing it back into ice.