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Question

Fill in the blanks in the following sentences.​
(a) A ____________ process in which a substance reacts with__________ to give off heat is called combustion.​
(b) When the clothes of a person catch __________, the person is covered with a __________ to extinguish fire.
(c) The __________ temperature at which a substance catches fire is called its __________ temperature.
(d) The substances which have very ________________ ignition temperature and can easily catch fire with a flame are called__________ substances.
(e) The substances which vapourise during __________, give flame.​

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Solution

(a) A chemical process in which a substance reacts with oxygen to give off heat is called combustion.​
  • During combustion, oxygen in the atmosphere combines with the substances to produce heat, light and gases like (CO2).
Substance +O2Heat + Light + Gases(CO2)

(b) When the clothes of a person catch fire, the person is covered with a blanket to extinguish fire.​
  • If a person's clothes catch fire, the best way to extinguish the fire is to cover the person with a woolen blanket. By covering with a blanket, the supply of oxygen (supporter of combustion) will be stopped.​
(c) The lowest temperature at which a substance catches fire is called its ignition temperature.​
  • When exposed to air the substance easily catches fire at the ignition temperature.​


(d) The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances.​

  • When exposed to air inflammable substance easily catches fire at very low temperature.​


(d) The substances which vapourise during burning, give flame.​

  • Flame producing substances are volatile compounds and vapourise to produce flame during combustion.​

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