ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

Give an experiment to explain that there are intermolecular spaces between water molecules.

Differentiate between the following.

Liquids and gases

Differentiate between the following.
Atoms and molecules

Fill in the blank:

The molecules are at a greater distance in ............. compared to liquids.

Fill in the blank:

Molecules in a.............. are packed very closely.

Fill in the blank:

When a gas is cooled, its molecules.......... energy.

Write true or false  for statement. Rewrite the false statement correctly.

 Matter cannot exist in different states.

Write true or false for statement. Rewrite the false statement correctly.

If the intermolecular space is more than the intermolecular force will be weaker.

Write true or false for statement. Rewrite the false statement correctly.

The smallest part of an element capable of independent existence 4s called an atom.

Write true or false for statement. Rewrite the false statement correctly.

The intermolecular space in a gas is almost negligible.

Which one is a kind of matter:

1. light
2. petroleum
3. sound
4. heat

Give one example that illustrates the following characteristics of a chemical reaction:

Change in state

How do the following help in bringing about a chemical change?

pressure.

How do the following help in bringing about a chemical change?

light.

How do the following help in bringing about a chemical change?

catalyst .

How do the following help in bringing about a chemical change?

heat. 

Define catalyst.

 What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.

Name three biochemical catalysts found in the human body.

Complete and balance the following chemical equations:

N₂ + O₂  →