Balancing Combustion Reactions

This video tutorial demonstrates how to balance the chemical equation for the combustion of C5H8 with O2, resulting in CO2 and H2O. The process involves counting the atoms of carbon, hydrogen, and oxygen on both sides of the equation and adjusting coefficients to achieve balance. The tutorial emphasizes leaving oxygen balancing to the last step, as it simplifies the process. The video concludes with a reminder of this strategy, highlighting its effectiveness in combustion reactions.

What is the first step in balancing the equation for C5H8 + O2?

• Count the number of carbon and hydrogen atoms.

• Add coefficients to water.

• Count the number of oxygen atoms.

• Balance the oxygen atoms first.

How many carbon atoms are present on the reactant side of the equation?

• Three

• Two

• Eight

• Five

What coefficient is placed in front of CO2 to balance the carbon atoms?

• 5

• 6

• 4

• 3

After balancing carbon, what is the total number of oxygen atoms on the product side?

• 12

• 13

• 11

• 10

What coefficient is used in front of H2O to balance the hydrogen atoms?

• 5

• 4

• 3

• 2

How many total oxygen atoms are needed on the reactant side after balancing hydrogen?

• 15

• 14

• 13

• 12

What is the final coefficient for O2 to balance the equation?

• 8

• 6

• 5

• 7

What is a good strategy for balancing combustion reactions?

• Use trial and error.

• Balance oxygen first.

• Balance carbon and hydrogen first, then oxygen.

• Start with the smallest molecule.