Chemistry Unit Test 1.

Front

What must be true about the number of atoms for each element in a chemical equation?

Back

The reactants and the products have to have the same amount of each element.

Front

What is the term for the substances formed as a result of a chemical reaction?

Back

Product

Front

What does the law of conservation of mass state?

Back

The total mass before a chemical reaction is the same as the total mass after the reaction.

Front

In a chemical equation, what is the information to the right of the arrow called?

Back

Product

Front

How many oxygen (O) atoms are in the products for the reaction @@2Fe_2O_3 ightarrow 4Fe + 3O_{2}@@?

Back

6

Front

What is a reactant in a chemical reaction?

Back

A substance that undergoes change during a chemical reaction.

Front

What is a chemical equation?

Back

A representation of a chemical reaction using symbols and formulas.

Front

What is the purpose of a chemical subscript in a formula?

Back

To indicate the number of atoms of each element in a molecule.

Front

What does it mean for a reaction to be balanced?

Back

The number of atoms for each element is the same on both the reactant and product sides.

Front

What is the difference between a reactant and a product?

Back

Reactants are the starting substances in a chemical reaction, while products are the substances formed.