Raghav is planning to start a bonfire in the evening and has collected lot of dry wood and leaves. He fetches a matchbox and starts the fire. In this example, what do you think is the activation energy?

Pouring kerosene on firewood

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Igniting the matchstick

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Collecting dry wood and leaves

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Availability of oxygen

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Solution

The correct option is B
Igniting the matchstick

Striking the matchstick against match pad.

Chemical reactions need a certain amount of energy to begin working. Activation energy is the minimum energy required to cause a reaction to occur. Moreover, a reaction will only proceed if the products are more stable than the reactants.

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Q. A lot of dry leaves are collected in a school garden and are burnt every day. Do you think that it is right to do so? If not, what should be done to dispose of the dry leaves?

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A lot of dry leaves are collected in a school garden and are burnt every day. Do you think that it is right to do so? If not, what should be done to dispose off the dry leaves?

Q. Students of a school had gone for an overnight camp. They gathered some wood and wanted to light a fire. They tried to light the fire with a matchstick but the wood would not catch fire. Someone suggested pouring kerosene over the wood, but no kerosene was available. Someone else suggested setting dry leaves on fire first with the matchstick and using it to light the wood. But they could not find any dry leaves.
Then Tanya brought a bottle of Vaseline(petroleum jelly) that she had brought with her to apply on her skin. She smeared it over a piece of cloth and set it on fire. She used it to light the wood.
Answer these questions.
1. Why could the wood not be set on fire by the matchstick?
2.How would kerosene have helped?
3.Why were dry leaves suggested and not green leaves?
4.Which two properties of petroleum jelly were used to light the fire?

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Question 10

To what use can you put the following kinds of garbage and how?

(a) Rotting smelly garbage.
(b) Dry leaves collected in a garbage.
(c) Old newspapers.

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