Fill in the blanks.
(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 gave very ………….. ignition temperature and can easily catch fire with a flame are called …………. substances.
(e) The substances which vaporise during …………….. give flame.

AcademicChemistryNCERTClass 8

(a) A chemical process in which a substance reacts with oxygen to give off heat is called combustion.

(b) When the clothes of a person catch fire, the person is covered with a blanket to extinguish the fire.

(c) The lowest temperature at which a substance catches fire is called its ignition temperature.

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

(e) The substances which vapourise during burning give flame. 
raja
Updated on 10-Oct-2022 13:26:57

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