Fill in the blanks using the words given in the box.
ignition, petrol, combustion, calorific value, combustible, inflammable
(a) A chemical process in which a substance reacts with oxygen to give off heat is called __________.
(b) Wood, paper, CNG are __________ substances.
(c) The lowest temperature at which a substance catches fire is called its __________ temperature.
(d) Ignition temperature of __________ is lower than that of wood.
(e) The substances which have very low __________ temperature and can easily catch fire with a flame are called __________ substances.
(f) The amount of heat energy produced on complete combustion of 1kg of a fuel is called its __________.
(a) Combustion
It is a process where a substance reacts with oxygen and gives off heat.
(b) Combustible
A substance that can catch fire easily is called combustible substances. Examples include wood, paper etc.
(c) Ignition
The lowest temperature at which a substance catches fire is called its ignition temperature.
(d) Petrol
Petrol is an inflammable substance
(e) Ignition, Inflammable
(f) calorific value