ICSE ICSE Class 8 - CISCE Question Bank Solutions

Select the chemical changes from the following list of changes

Rotting of eggs.

Select the chemical changes from the following list of changes

Drying of a fruit

Select the chemical changes from the following list of changes

The carbon cycle.

Select the chemical changes from the following list of changes

The occurrence of lightning.

Select the chemical changes from the following list of changes

Breaking of glass

Select the chemical changes from the following list of changes

Butter turning rancid

Select the chemical changes from the following list of changes

Glowing of an electric bulb.

Select the chemical changes from the following list of changes

The crystallisation of salt from its solution.

Select the chemical changes from the following list of changes

Change of seasons

Select the chemical changes from the following list of changes

Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.

Select the correct answer from the choice given below to complete the sentence

A change in which a substance retains its identity is a

______ change.

Select the correct answer from the choice given below to complete the sentence

The matter is added or removed during a ____________  change.

Select the correct answer from the choice given below to complete the sentence

The energy required for completion of a physical change is ______________ when the change is reversed.

Select the correct answer from the choice given below to complete the sentence

The dissolution of lead nitrate in water is deemed as a _________ change.

A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.

State which of the following 1 to 5 pertain to – A: Physical Change B: Chemical change :

1. Sublimation.
2. Fermentation.
3. Liquefaction or condensation.
4. Magnetization.
5. Respiration.

Give the reason why the following is considered as chemical changes.

Copper carbonate on heat gives copper oxide and carbon dioxide.

Give the reason why the following is considered as chemical changes.

A bright light is seen evolved when a strip of magnesium is heated.

Give the reason why the following is considered as chemical changes.

Sulphur when burnt in air evolves a gaseous acidic product.

Give the reason why the following is considered as chemical changes.

An iron nail kept open in the atmosphere rusts.