Podcast
Questions and Answers
What is the main reason for the black smoke produced when coal, wood, and oils are burnt?
What is the main reason for the black smoke produced when coal, wood, and oils are burnt?
- Unburnt carbon particles (correct)
- Incomplete combustion of the materials
- Sulphur compounds in coal and oils
- Presence of poisonous gases like CO and SO2
Which component of petrol contributes to the incomplete combustion process in car engines?
Which component of petrol contributes to the incomplete combustion process in car engines?
- Water vapour
- Alcohol
- Hydrocarbons (C8H18) (correct)
- CO2
What is the primary reason for the emission of CO into the air from car engines?
What is the primary reason for the emission of CO into the air from car engines?
- Incomplete combustion of petrol
- Burning of hydrocarbons
- Short time available for burning (correct)
- Presence of alcohol in petrol
What type of gases are released by the internal combustion engines of cars, buses, trucks, and aeroplanes?
What type of gases are released by the internal combustion engines of cars, buses, trucks, and aeroplanes?
What is the impurity present in coal that leads to the formation of SO2 when coal is burnt?
What is the impurity present in coal that leads to the formation of SO2 when coal is burnt?
What is the main reason for the black color of the smoke produced by burning coal, wood, and oils?
What is the main reason for the black color of the smoke produced by burning coal, wood, and oils?
Which component emitted by car engines contributes to air pollution due to its poisonous nature?
Which component emitted by car engines contributes to air pollution due to its poisonous nature?
Flashcards
What causes black smoke when burning fuels?
What causes black smoke when burning fuels?
Tiny pieces of carbon that didn't burn completely.
What in petrol leads to incomplete combustion?
What in petrol leads to incomplete combustion?
These compounds in petrol make it hard to burn completely in car engines.
Why do car engines emit CO?
Why do car engines emit CO?
The engine doesn't have enough time to burn all the fuel, so some carbon monoxide is released.
What gases do car engines release?
What gases do car engines release?
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What in coal causes SO2 when burned?
What in coal causes SO2 when burned?
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Why is smoke from burning fuels black?
Why is smoke from burning fuels black?
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Why is CO emitted by car engines dangerous?
Why is CO emitted by car engines dangerous?
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Study Notes
Combustion and Emissions
- Black smoke from burning coal, wood, and oils is mainly due to incomplete combustion, resulting in unburnt carbon particles.
- Hydrocarbons in petrol, particularly the longer-chain hydrocarbons, contribute to the incomplete combustion process in car engines.
- Carbon monoxide (CO) is emitted from car engines primarily due to insufficient oxygen during combustion, leading to incomplete oxidation of carbon.
- Internal combustion engines in cars, buses, trucks, and aeroplanes release various gases, including carbon dioxide (CO2), carbon monoxide (CO), nitrogen oxides (NOx), and hydrocarbons.
Impurities and Air Pollution
- The impurity in coal that leads to the formation of sulfur dioxide (SO2) upon burning is sulfur.
- Black smoke is primarily caused by the presence of soot, which results from the unburned carbon particles released during incomplete combustion.
- The carbon monoxide emitted by car engines poses significant air pollution risks due to its toxic nature, contributing to health hazards.
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