Question

Fill in the blanks.
a) Fuels release their energy through a chemical reaction known as_________
b)_________reaction is accompanied by the evolution of heat.
c) The substances which_____
easily on burning give flames.
d) Changing of solids directly into vapour on heating is called_______
e) Unburnt carbon particles form_______which appears as a dark powder.
f)_______should never be used in case of an electrical fire.​

Answer 1

Answer:

a)EXOTHERMIC reaction.

b) Exothermic reaction.

c) Inflammable substances.

d) Sublimation.

e) Ash

f) Water

Explanation:

a) b) Hydrocarbon fuels like methane (CH4) burn in the presence of oxygen to produce carbon dioxide and water. This process of combustion releases energy. When energy is released during the course of a chemical reaction, it is said to be an EXOTHERMIC reaction.

c)The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances. Examples of inflammable substances are petrol, alcohol, Liquified Petroleum Gas (LPG), etc.

d)A change in which a solid on heationg directly changes into vapour state is called sublimation.

e)ash ; Unburnt carbon particles form "ash" which appears as dark powder. The answer is "Ash".

f) Never use water to extinguish an electrical fire.

Electrical equipment must be unplugged and/or de-energized before using a water extinguisher on it.

Hope this Helps

Mark as brainiest

Answer 2

Here is your answer :-

a) exothermic reaction
b) exothermic reaction
C) inflammable substance
D)sublimation
E) ash
D) water

Hope this helps you : )