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 dissolving.

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 exploding.

Front

What happens to the weight of an object when it burns?

Back

The weight of an object decreases when it burns because it transforms into gases and ash, which are lighter.

Front

Is freezing juice a physical or chemical change?

Back

Freezing juice is a physical change.

Front

What occurs when wood burns?

Back

When wood burns, a chemical change takes place, resulting in ash, smoke, and gases.

Front

What is an example of a physical change?

Back

An example of a physical change is squeezing oranges to make orange juice.

Front

What is an example of a chemical change?

Back

An example of a chemical change is exploding fireworks.

Front

Can a physical change be reversed?

Back

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

Front

Can a chemical change be reversed?

Back

Most chemical changes cannot be easily reversed, such as burning wood.

Front

What is the difference between a physical and chemical change?

Back

A physical change alters the form or appearance of a substance without changing its composition, while a chemical change results in the formation of new substances.