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Combustion Reaction Overview

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Questions and Answers

How many molecules of carbon dioxide are produced if there are 5 carbon atoms in the hydrocarbon?

Five molecules (correct)

Four molecules

Two molecules

Three molecules

Why is it necessary to balance the chemical reaction element-wise during combustion?

To increase the energy absorbed

To speed up the reaction

To make sure all atoms are accounted for (correct)

To ensure the energy released is accurate

In the combustion of methane, what is the total energy absorbed for breaking bonds?

712 kJ

3358 kJ

1490 kJ

2642 kJ (correct)

Which type of bond formation releases the highest amount of energy during the combustion of methane?

C=O bonds Signup and view all the answers

Why is the net energy value released during bond formation an approximation?

As a result of using average bond energy values Signup and view all the answers

What is a key difference between complete combustion and incomplete combustion?

Complete combustion takes place in excess of oxygen, while incomplete combustion takes place in a limited quantity of oxygen. Signup and view all the answers

What is bond energy also known as?

Bond enthalpy Signup and view all the answers

Why are fires sometimes extinguished by smothering them with a heavy cloth?

To cut off the supply of oxygen to the fire Signup and view all the answers

In the combustion reaction formula, what are typically the reactants?

Hydrocarbons and oxygen Signup and view all the answers

What is the main reason for the energy released during combustion reactions?

Formation of new bonds between carbon and oxygen Signup and view all the answers

What is the defining feature of a combustion reaction?

Release of water and carbon dioxide Signup and view all the answers

Why doesn't combustion take place all the time at places like gas outlets and campsites?

Need for activation energy to start the reaction Signup and view all the answers

What is the difference between complete and incomplete combustion reactions?

Formation of carbon monoxide in incomplete combustion Signup and view all the answers

Why are hydrocarbons used as fuels for vehicles and cooking?

Because they contain carbon and hydrogen Signup and view all the answers

What is required to break the bonds present in hydrocarbons and oxygen to start a combustion reaction?

Activation energy Signup and view all the answers