Evidence of Chemical Reactions

Front

What are the reactants in the equation 2Mg + O2 ---> 2MgO?

Back

The reactants are Mg and O2.

Front

What observation indicates that a gas is produced during a chemical reaction?

Back

Bubbles form in the solution.

Front

What is a sign that a chemical reaction has taken place?

Back

The substance changes color.

Front

What does evidence of a chemical reaction show?

Back

It shows that a new substance has formed.

Front

Is rust on an old car an example of a chemical reaction?

Back

True.

Front

What is a chemical reaction?

Back

A process where substances (reactants) transform into new substances (products).

Front

What is a product in a chemical reaction?

Back

The substances that are formed as a result of a chemical reaction.

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 chemical change?

Back

A change that results in the formation of new chemical substances.

Front

What is an example of a chemical reaction?

Back

Burning wood, which produces ash, smoke, and gases.