Chemical reactions

Front

What is a chemical reaction?

Back

A process where substances (reactants) change into new substances (products) through the breaking and forming of chemical bonds.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, the mass of the reactants is equal to the mass of the products.

Front

What is a reactant?

Back

A substance that exists before a chemical reaction takes place and is transformed during the reaction.

Front

What is a product?

Back

A new substance that forms as a result of a chemical reaction.

Front

What is scientific evidence?

Back

Data that can be used to support a scientific claim or argument.

Front

What happens to atoms during a chemical reaction?

Back

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

Front

What is an example of a chemical change?

Back

Burning wood, which transforms it into ash, smoke, and gases.

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 an example of a physical change?

Back

Melting ice into water.

Front

What are the signs of a chemical reaction?

Back

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