Balancing Combustion Reactions with Fractions

What is the first step in balancing a combustion reaction involving fractions?

• Identify the number of each element in reactants and products

• Use fractions immediately

• Multiply all subscripts by 2

• Balance the oxygen atoms first

When balancing a combustion reaction, which element should be left for the very end?

• Carbon

• Nitrogen

• Hydrogen

• Oxygen

How many hydrogen atoms are needed on the product side to balance with 14 hydrogen atoms on the reactant side?

• 2

• 28

• 7

• 14

What indicates the need to use a fraction in balancing a combustion reaction?

• A balanced number of hydrogen atoms

• An odd number of oxygen atoms

• An even number of carbon atoms

• A compound with nitrogen

What is the final step to eliminate fractions in a balanced equation?

• Add more reactants

• Subtract oxygen atoms

• Multiply all subscripts by 2

• Divide all subscripts by 2