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Introduction to Alkanes

Those substan...

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Those substance which can burn are called combustible substance.all kind of substance are burn by friction . The substances which are very high ignition temperature like Stones and meteoroids . Why we says it non combustible Substance.

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Q. 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 ______.

Q. Question 16
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 ignition 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.

Q. Question 16
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 ignition 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.

Q. 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.

Q. Question 26
Fill in the blanks using the words given in the box.

(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 ___.

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