ICSE ICSE Class 8 - CISCE Question Bank Solutions

Melting of solid (wax) is a physical change.

Chemical changes are accompanied by changes in energy.

Photosynthesis cannot take place at night.

 Write short answer.

Name two reversible changes.

Write short answer.

Give two examples of periodic changes

 Write short answer.

Give an example of desirable change which can also be undesirable

 Write short answer.

What are man-made changes ?

Write short answer.

Sublimation is classified as a physical change. Why ?

Classify the following changes as physical or chemical: curdling of milk

A physical change is temporary. Explain.

State the differences between a physical change and a chemical change.

State the various conditions that favour the process of evaporation.

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.