Balancing Combustion Reactions

This video tutorial demonstrates how to balance the chemical equation for the combustion of C7H14 with O2, resulting in carbon dioxide and water. The process involves counting and balancing carbon, hydrogen, and oxygen atoms. The tutorial explains using fractions to balance oxygen atoms and converting them to whole numbers by multiplying all coefficients. Key strategies include leaving oxygen balancing for last and using fractions when necessary.

What type of reaction is C7H14 plus O2?

• Single Replacement

• Combustion

• Decomposition

• Synthesis

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

• 8

• 7

• 6

• 5

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

• 6

• 5

• 8

• 7

After balancing carbon, how many oxygen atoms are there on the product side?

• 12

• 14

• 16

• 15

What coefficient is used to balance the hydrogen atoms?

• 6

• 8

• 7

• 5

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

• 21

• 20

• 19

• 18

What fraction is used to balance the oxygen atoms initially?

• 22/2

• 19/2

• 21/2

• 20/2

What is the whole number coefficient for O2 after adjusting the fraction?

• 20

• 21

• 22

• 23

What is a key strategy for balancing combustion reactions?

• Balance oxygen first

• Use whole numbers only

• Leave oxygen till last

• Balance hydrogen first

What can be done if a fraction is used in balancing?

• Divide all coefficients by 2

• Ignore it

• Multiply all coefficients by 2

• Use a different fraction