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 digestion.

Front

Is melting ice a chemical or physical change?

Back

Melting ice is a physical change.

Front

Is burning wood a chemical or physical change?

Back

Burning wood is a chemical change.

Front

What happens during an exothermic reaction?

Back

During an exothermic reaction, energy is released.

Front

What happens during an endothermic reaction?

Back

During an endothermic reaction, energy is absorbed.

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 the rusting of iron.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is a reactant?

Back

A reactant is a substance that undergoes a chemical change in a reaction.