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Complete combustion of a hydrocarbon yields carbon dioxide & water; incomplete combustion yields carbon monoxide & water. By having excess oxygen you have enough oxygen to ensure complete combustion. For example the combustion of methane (CH4):
complete combustion: CH4 + 2O2 --> CO2 + 2H2O
incomplete combustion: CH4 + 1.5O2 --> CO + 2H2O
As you can see you need a 1/2 mole less of oxygen for the incomplete combustion of methane. So as long as you have twice the amount (in terms of moles) of oxygen as methane you will ensure complete combustion. So anything in excess of that will also ensure complete combustion.
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What are the precautions to be taken during incomplete combustion?
A regular supply of oxygen or air can avoid the incomplete combustion.
How are the incomplete and complete combustion reactions different?
In complete combustion, all the reactants will be converted into carbon dioxide and water. In incomplete combustion, some of the reactants will be converted to carbon dioxide, some will become carbon monoxide, and some may not react at all. Quite often incomplete combustion will result in a "sooty" flame.
Is carbon monoxide stable?
Carbon monoxide is quite stable, and is formed by the combustion of carbon in inadequate supply of oxygen.
Color of flame in a complete combustion of gas from Bunsen burner?
When the air hole is covered on the Bunsen Burner its oxygen supply is made smaller. This makes the flame turn YELLOW - This is considered to be the safety flame as it is the most visible to the eye and it radiates less heat. When the Bunsen burners air hole is fully open there is a super heated blue flame which is the product of complete combustion. Hope this helped :)
What would be the product when combustion reaction occurs in a small tightly-closed container?
Carbon monoxide (and some carbon dioxide) as the oxygen supply is restricted.
How combustion of carbon differs in a limited supply of oxygen compared to when oxygen is in excess?
Oxygen in excess: carbon dioxide is obtained.Not sufficient oxygen: carbon monoxide is obtained.
Why is it better to burn fuels in a good supply of oxygen?
If you have a good supply of oxygen you get a more complete burn, which means you get more energy out of the fuel and there are fewer products of incomplete combustion, which are often toxic
What are the precautions to be taken during incomplete combustion?
A regular supply of oxygen or air can avoid the incomplete combustion.
How a Bunsen burner can display both complete and incomplete combustion?
The Bunsen burner would display complete combustion by producing a "roaring" blue flame and it would display incomplete combustion when you close the air valve complete to cut off the oxygen gas supply, thus creating a yellow flame due to the burning of carbon particles (soot).
If hexane was burned in a limited supply of oxygen the combustion would not be complete?
This depends on how much hexane was being burned and how much oxygen was present.Because the complete combustion of carbon involves placing two moles of oxygen on one mole of carbon plus the formation of water, you would need 19 moles of diatomic oxygen for every one mole of hexane.1 C6H14 + 19 O2 --> 6 CO2 + 7 H2O
Fuel rich fire that occurs when the supply of air or oxygen is limited?
incomplete combustion
What is sooty and non sooty flame and why it is occurred?
sooty flame refers to the flame produces after burning, which shows incomplete combustion, i.e, insufficient supply of oxygen.
Does a fire have oxygen?
Yes, most fires need oxygen to burn (combustion is a rapid form of oxidation). If there is no continuous supply of oxygen, a fire will go out.
What is the equation for slow combustion of coal in a limited oxygen supply?
2c + o2 = 2 co
Balanced equation for the burning carbon in air?
For complete combustion, the equation is C + O2 => CO2. If the supply of oxygen is limited, carbon monoxide can also form, along with soot and other materials.
What causes a burner flame to be smoky and to separate from the tip of the burner?
If there is not a sufficient supply of oxygen, the flame will be smoky from excess of carbon.
How are the incomplete and complete combustion reactions different?
In complete combustion, all the reactants will be converted into carbon dioxide and water. In incomplete combustion, some of the reactants will be converted to carbon dioxide, some will become carbon monoxide, and some may not react at all. Quite often incomplete combustion will result in a "sooty" flame.
