Balancing Combustion Reactions

The video tutorial explains how to identify and balance combustion reactions. It begins with an introduction to combustion reactions, highlighting the typical reactants and products. The tutorial then provides steps to identify combustion reactions, followed by detailed instructions on balancing them. Two examples are used to demonstrate the balancing process, including a simple reaction with C3H8 and a more complex reaction. The tutorial emphasizes the importance of balancing carbon, hydrogen, and oxygen atoms in the reactions.

What is the general form of a combustion reaction?

• Compound + Oxygen -> Water + Nitrogen Dioxide

• Compound + Nitrogen -> Water + Carbon Dioxide

• Compound + Oxygen -> Water + Carbon Dioxide

• Compound + Hydrogen -> Water + Carbon Dioxide

Which of the following is NOT a combustion reaction?

• C2H6 + O2 -> CO2 + H2O

• Fe + O2 -> Fe2O3

• C3H8 + O2 -> CO2 + H2O

• CH4 + O2 -> CO2 + H2O

What is the first step in balancing a combustion reaction?

• Balance oxygen atoms

• Balance hydrogen atoms

• Balance carbon atoms

• Balance nitrogen atoms

In the reaction C3H8 + O2 -> CO2 + H2O, how many CO2 molecules are needed to balance the carbon atoms?

• 4

• 3

• 2

• 1

How many H2O molecules are needed to balance the hydrogen atoms in the reaction C3H8 + O2 -> CO2 + H2O?

• 3

• 5

• 4

• 2

In the example with a complex compound, what is the value of x when solving for the oxygen coefficient?

• 11

• 12

• 9

• 10

What is the final step in balancing a combustion reaction?

• Balance carbon atoms

• Balance hydrogen atoms

• Balance nitrogen atoms

• Balance oxygen atoms

When handling fractional coefficients, what should you do to make them whole numbers?

• Divide by two

• Multiply by two

• Subtract one

• Add one

In the final example, what is the coefficient of O2 after adjusting for whole numbers?

• 31

• 30

• 29

• 28

What is the balanced equation for the final example after adjusting for whole numbers?

• 2C12H22O6 + 29O2 -> 24CO2 + 22H2O

• C12H22O6 + 30O2 -> 24CO2 + 22H2O

• 2C12H22O6 + 30O2 -> 24CO2 + 22H2O

• C12H22O6 + 29O2 -> 24CO2 + 22H2O