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 shredding paper, boiling water, and melting ice.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of one or more new substances with different properties. Examples include rusting iron, burning wood, and baking a cake.

Front

What happens to the weight of matter during a chemical change?

Back

The weight of matter stays the same during a chemical change, as mass is conserved.

Front

If you mix 1 gram of salt with 50 grams of water, how many grams of matter do you have?

Back

You have 51 grams of matter after the salt is completely dissolved.

Front

What is an example of a physical change?

Back

An example of a physical change is boiling water.

Front

What is an example of a chemical change?

Back

An example of a chemical change is burning wood.

Front

Can a physical change be reversed?

Back

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

Front

Can a chemical change be reversed?

Back

Most chemical changes cannot be easily reversed, as they create new substances.

Front

What is the difference between a physical change and a 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.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the molecules may change their arrangement or state, but their chemical structure remains the same.