Combustion and Flame class 8 worksheets with answers Combustion and Flame This worksheet is for Grade 8 Science, comprising the topic of Combustion and Flame. It will help students develop a better understanding of Combustion and Flame.
1. List conditions under which combustion occurs. The following are the conditions under which combustion occurs:
The presence of oxygen, a combustion supporter.
Attaining the desired ignition temperature.
The presence of combustible material.
2. Explain how the usage of compressed natural gas (CNG) in automobiles has helped to minimise pollution in our cities. The usage of compressed natural gas (CNG) in cars has resulted in significant reductions in pollution in our cities in the following ways:
When compared to other petroleum-based fuels like gasoline and diesel, compressed natural gas (CNG) is a clean fuel that produces no smoke when burned.
For automobiles to run, petroleum fuel is burnt.
The combustion of fuel leaves unburnt carbon particles in the air, along with carbon monoxide (CO) – a poisonous and harmful gas.
Breathing CO causes headache, dizziness, etc.
CNG burns completely leaving no harmful residue.
3. Give a comparison between LPG and wood as fuels. LPG
Wood
It is a gaseous fuel.
It is a solid fuel.
Fuel with a higher calorific Fuel with lower calorific value value (55000 kJ/kg). (17000kJ/kg – 22000 kJ/kg).
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