ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

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.

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

A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.

Match the examples of changes in List I with the correct type of change in List II.

Name the following.

The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.

Name the following.

The product obtained during a physical change when water converts from a liquid into a solid.

Name the following.

The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.

Name the following.

A form of energy required for a chemical change.

Name the following.

The gaseous product of the chemical change which takes place during respiration in living organisms.

Define of matter.

Define of intermolecular force of attraction.

What are the three states of matter ? Define each of them with two examples.

State the main postulates of kinetic theory of matter.

What happens to water if it is kept in a deep freezer.