Q.7. We can boil water in a paper cup while paper catches fire easily. Give reason.
Q.8. Name and give chemical equations to show the products of the combustion reaction
in
a) Limited supply of air
b) Sufficient supply of air
Q.9. Make a labelled diagram of a candle flame.
Q.10. In an experiment 5 Kg of fuel was completely burned. The heat produced was
measured to be 200,000 KJ. Calculate the calorific value of the fuel.
Q.11. How does a Soda-acid fire extinguisher work. Explain with the help of a chemical
equation.
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Answer:
Q7 Paper ignites at a much higher temperature than the boiling point of water. The paper will ignite around 230 degrees Celsius and water boils at 100 degrees Celsius. Although the fire is hot enough to ignite the paper cup, the heat energy is absorbed by the water, causing it to boil
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