Fill in the blanks using the words given in the box.
ignition, petrol, combustion, calorific value,
(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 __________
(f) The amount of heat energy produced on complete combustion
of 1kg of a fuel is called its __________.
NCERT Class VIII
Science - Exemplar Problems
Chapter 6. Combustion and Flame