Balancing Combustion Reactions

The video tutorial explains the process of balancing the chemical equation for the complete combustion of butane (C4H10). It begins by introducing the concept of organic combustion, involving hydrocarbons, oxygen, carbon dioxide, and water. The tutorial then guides viewers through the steps of balancing the equation, focusing on updating the counts of oxygen and hydrogen atoms. It addresses the challenge of oxygen imbalance and demonstrates how to solve it using fractional coefficients, which are later converted to whole numbers. The video concludes by discussing the states of matter and reaction conditions, emphasizing the exothermic nature of combustion.

What are the products of the complete combustion of butane?

• Hydrogen and carbon monoxide

• Nitrogen and water

• Carbon dioxide and water

• Methane and oxygen

Why is oxygen left for last when balancing combustion equations?

• Because it is a noble gas

• Because it does not affect the number of carbon or hydrogen atoms

• Because it is the most reactive element

• Because it is always in excess

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

• 2

• 3

• 4

• 5

How many oxygen atoms are there in the products after balancing CO2 and H2O?

• 9

• 10

• 11

• 13

What is the fractional coefficient used for O2 in the balanced equation?

• 11/2

• 14/2

• 12/2

• 13/2

How do you convert fractional coefficients to whole numbers in a balanced equation?

• Subtract 1 from all coefficients

• Divide all coefficients by 2

• Multiply all coefficients by 2

• Add 1 to all coefficients

What is the ratio of butane molecules to oxygen molecules in the balanced equation?

• 1:6

• 2:13

• 3:8

• 4:10

At room temperature, what is the state of butane?

• Plasma

• Gas

• Liquid

• Solid

What type of reaction is combustion?

• Endothermic

• Exothermic

• Neutral

• Reversible

What happens to water in an exothermic combustion reaction?

• It decomposes

• It turns into ice

• It remains a liquid

• It becomes a gas