Chemical and Physical Changes

Front

What is a chemical change?

Back

A process that results in the formation of new substances with different properties from the original substances.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a precipitate?

Back

A solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What are the signs of a chemical change?

Back

Color change, gas production, temperature change, formation of a precipitate, and change in odor.

Front

Can a chemical change be reversed?

Back

Most chemical changes are not easily reversible, unlike physical changes.

Front

What is an example of a chemical change?

Back

Burning wood, rusting iron, or baking a cake.

Front

What is an example of a physical change?

Back

Melting ice, boiling water, or dissolving sugar in water.

Front

What happens to atoms during a chemical change?

Back

Atoms are rearranged to form new substances, but they are not created or destroyed.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, matter is neither created nor destroyed; the mass of the reactants equals the mass of the products.

Front

What is an example of a reaction that produces a gas?

Back

Vinegar reacting with baking soda to produce carbon dioxide gas.