ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

Give reasons:

Solids cannot be compressed.

Give reasons:
Liquids can flow 

When magnesium is burnt in air, there is an increase in mass after the reaction.

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The change of a solid into a liquid is called melting or................

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The process in which a solid directly changes into a gas is called ....................

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The change of water vapour into water is called ......................

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The temperature at which a liquid starts changing into its vapour state is ______.

Give two example of the following:
The substances which sublime. 

Give two example of the following:

The substances which do not change their state on heating.

When sodium chloride is added to a definite volume of water and stirred well, a solution is formed, but there is no increase in the level of water. Why?

What do you observe when a gas jar which appears empty is inverted over a gas jar containing Bromine vapours? Name the phenomenon.

Why can a piece of chalk be broken easily into smaller pieces while a coal piece cannot be broken easily?

What is volume ?

What is mass ?

If an object weighs 6 kg on earth. What will be its weight on moon ?

If an object is taken to the moon from the earth what will be its mass ?

Classify the following into solids, liquids and gases.
Oxygen, milk, common salt, wax, stone, water vapour, carbon-dioxide, sugar, mercury, coal, blood, butter, copper, coconut oil, kerosene.

Why do solids, liquids and gases differ in their physical states ?

What are fluids ? Give two examples.

Define interconversion of states of matter.