Balancing Combustion Reactions

The video tutorial explains how to balance a chemical equation, specifically a combustion reaction involving a hydrocarbon and oxygen. It begins by counting the atoms on both sides of the equation and then describes a strategy to balance the equation by adjusting coefficients, particularly focusing on leaving oxygen balancing until the end. The tutorial provides a step-by-step guide to ensure all atoms are balanced, resulting in a balanced chemical equation for the combustion of C8H18.

What is the initial count of carbon atoms on the reactant side of the equation?

• 8

• 6

• 10

• 12

In a combustion reaction, which compounds are typically produced?

• Methane and oxygen

• Water and carbon dioxide

• Hydrogen and nitrogen

• Water and carbon monoxide

Why is it recommended to leave the oxygen atoms to balance last in combustion reactions?

• Oxygen is the heaviest atom

• Oxygen is the most reactive

• Oxygen is usually in excess

• Oxygen is often found alone

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

• 8

• 9

• 7

• 6

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

• 15

• 16

• 17

• 18

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

• 7

• 8

• 10

• 9

How many total oxygen atoms are there on the product side after balancing hydrogen?

• 26

• 25

• 24

• 23

What is the final coefficient placed in front of O2 to balance the equation?

• 10

• 11

• 12

• 13

What is the total number of oxygen atoms on the reactant side after balancing?

• 23

• 24

• 25

• 26

What is the balanced chemical equation for the combustion of C8H18?

• C8H18 + 12.5 O2 → 8 CO2 + 9 H2O

• C8H18 + 11 O2 → 8 CO2 + 9 H2O

• C8H18 + 10 O2 → 8 CO2 + 9 H2O

• C8H18 + 13 O2 → 8 CO2 + 9 H2O