Chemical and Physical Changes

Front

What is a physical property?

Back

A characteristic of a substance that can be observed or measured without changing its identity, such as color, texture, and melting point.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition, such as cutting, melting, or dissolving.

Front

What is a chemical property?

Back

A characteristic of a substance that describes its ability to change into different substances, such as flammability or reactivity.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances, such as rusting, burning, or reacting with acid.

Front

What is the difference between size-dependent and size-independent properties?

Back

Size-dependent properties, like mass and volume, change with the amount of substance, while size-independent properties, like density and boiling point, do not.

Front

What happens to energy when a substance is melted?

Back

Energy is added to the substance.

Front

Is dissolving sodium hydroxide in water a chemical change?

Back

No, it is a physical change because the chemical composition of sodium hydroxide remains the same.

Front

What is an example of a physical change?

Back

Cutting a piece of paper or melting ice.

Front

What is an example of a chemical change?

Back

Burning wood or baking a cake.

Front

Can physical changes be reversed?

Back

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