Balancing Chemical Equations & Law of Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

It states that matter cannot be created or destroyed.

Front

Is the following reaction balanced? NaHCO₃ --> Na₂CO₃ + H₂O + CO₂

Back

No

Front

How many HCl molecules do you need to balance this equation? Mg + __HCl --> MgCl₂ + H₂

Back

2

Front

What is a coefficient in a chemical equation?

Back

The large number in front of a chemical formula.

Front

Is the following equation balanced? 4Fe + 3O₂ --> 2Fe₂O₃

Back

Yes

Front

What does it mean to balance a chemical equation?

Back

To ensure that the number of atoms of each element is the same on both sides of the equation.

Front

What is a reactant in a chemical reaction?

Back

A substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

A substance that is formed as a result of a chemical reaction.

Front

What is the purpose of using coefficients in a chemical equation?

Back

To indicate the number of molecules or moles of a substance involved in the reaction.

Front

What is the difference between a chemical equation and a balanced chemical equation?

Back

A balanced chemical equation has equal numbers of each type of atom on both sides.