Front

What is a coefficient?

Back

The large number to the left of a formula.

Front

Which problem is balanced? PbO2 + 2H2 --> H2SO4, SO2 + H2O --> H2SO4, 2Na + 2H2O --> 2NaOH + H2, 2Na + 2H2O --> 2NaOH + H

Back

2Na + 2H2O --> 2NaOH + H

Front

What does the Law of Conservation of Mass state?

Back

Matter cannot be gained or lost in a chemical reaction.

Front

Balance this equation: Al2O3 --> Al + O2

Back

2Al2O3 --> 4Al + 3O2

Front

Is the equation N2 + H2 = NH4 balanced or unbalanced?

Back

Unbalanced

Front

What is the purpose of balancing chemical equations?

Back

To ensure that the number of atoms for 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 does it mean for an equation to be balanced?

Back

It means that the number of atoms of each element is equal on both sides of the equation.

Front

What is the first step in balancing a chemical equation?

Back

Identify the number of atoms of each element in the reactants and products.