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.

Front

What is a chemical change?

Back

A chemical change is a process that involves the transformation of one or more substances into different substances, resulting in the formation of new chemical compounds.

Front

Can a physical change be reversed?

Back

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

Front

Can a chemical change be reversed?

Back

Chemical changes are usually not reversible by simple physical means, as they create new substances.

Front

What is an example of a physical change?

Back

Melting ice, boiling water, and dissolving sugar in water are examples of physical changes.

Front

What is an example of a chemical change?

Back

Burning wood, rusting iron, and baking a cake are examples of chemical changes.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the arrangement of molecules may change, but the molecules themselves remain the same.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the bonds between atoms are broken and new bonds are formed, resulting in the creation of new substances.

Front

What is the law of conservation of mass in relation to chemical changes?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of the reactants equals the total mass of the products.

Front

What are indicators of a chemical change?

Back

Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.