What are the products of any combustion of any fuel?

Important Questions on Chemical Changes and Reactions

EASY

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

State any two conditions required for combustion.

MEDIUM

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

Name two substances having low ignition temperatures and two having high ignition temperatures.

EASY

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

Nitrogen supports combustion.

EASY

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

What are combustible substances? Name three combustible substances.

EASY

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

Blisters and ulcers occur in the case of _____.

MEDIUM

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

Why does a goldsmith blow air into the kerosene lamp flame with a blow-pipe?

EASY

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

List conditions under which combustion can take place.

MEDIUM

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

Why do you have to use paper or kerosene oil to start fire in wood or coal?

MEDIUM

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

Can the process of rusting be called combustion? Give reason for your answer.

EASY

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain. 

MEDIUM

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

What are the conditions necessary for combustion to take place?

EASY

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

_____ is the technique to put out a fire on our clothes. (Give proper indentation) [Stop, drop and roll/ Run and jump in water]

HARD

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

How will you show that air is necessary for combustion?

EASY

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

The temperature of the substance should be lowered below the _____ temperature. (room / kindling)

MEDIUM

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

What are fuels? Name any two common fuels.

EASY

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

What are non-combustible Substances? Name three non-combustible substances.

MEDIUM

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

Explain why, when a burning candle is covered with an inverted gas jar, the candle gets extinguished after some time.

EASY

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

Which one is a supporter of combustion?

MEDIUM

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

Can you burn a piece of wood by burning a lighted matchstick near it? Explain.

MEDIUM

Science>Chemistry>Chemical Changes and Reactions>Change of Energy during Chemical Reaction

If you see a person whose clothes are on fire, how will you extinguish the fire? Give reason for your answer.