ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

How do you say that the process of digestion is a chemical change ?

What role does energy play in initiating a chemical change ?

Solve this crossword by using the clues that follow.

Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1. It is the change that takes place in case of swinging pendulum of a clock.
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change

Make a list of different types of changes with example.

 Fill in the blank

 The outermost shell of an atom is known as............................

Fill in the blank

Neutrons are .......................... particles having mass equal to that of protons.

Write true or false for the following statement

The maximum number of electrons in the first shell can be 8.

 Write true or false for the following statement

The central pad of the atom is called nucleus.

 Give the following a suitable word/phrase
The sub-atomic particle with negative charge and negligible mass.

Give the following a suitable word/phrase.

Protons and neutrons present in the nucleus.

 Give the following a suitable word/phrase.

The electrons present in the outermost shell.

Give the following a suitable word/phrase

Arrangement of electrons in the shells of an atom.

 Give the following a suitable word/phrase.

The sum of the number of protons and neutrons of an atom.

 Give the following a suitable word/phrase.

The smallest unit of an element which takes part in a chemical reaction.

 Multiple Choice Questions

The outermost shell of an atom is known as

 Multiple Choice Questions

number of valence electrons present in magnesium is

Name three fundamental particles of the atom. Give the symbol with charge, on each particle.

Define the term Atomic number. 

Mention briefly the salient features of Dalton’s atomic theory (five points)

What are the observations of the experiment done by Rutherford in order to determine the structure of an atom?