ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

Give a reason for the following statement :

Components in a mixture can be separated by physical methods only.

Give a reason for the following statement :

Centrifugation can be used for separating an insoluble heavier solid, present in an – insoluble solid-liquid mixture.

Give a reason for the following statement :

Zinc is considered an element, while zinc sulphide is considered a compound.

 State the law of conversation of mass.

What do you observe when, barium chloride solution is mixed with sodium sulphate solution ?

When magnesium is burnt in air, there is an increase in mass after the reaction.

What is mass ?

If an object weighs 6 kg on earth. What will be its weight on moon ?

If an object is taken to the moon from the earth what will be its mass ?

Give reason for the following.

Electricity is not considered matter.

 Fill in the blank:

Matter is anything that has............. and occupies .............

State the law of conservation of mass.

Why is water used in hot-water bottles?

Give a reason why metals are arranged in a series called – ‘activity series of metals’. Name a metal which reacts with

(a) Cold water
(b) Boiling water
(c) Steam to liberate hydrogen in each case.

Give a balanced equation for the following conversion:

Iron to triiron tetroxide using steam.

State the ‘law of conservation of mass’.

Complete the statement given below by filling in the blanks with the correct words.

Atoms contain ________ with positively charged ________.

State the main points of Landolt’s experiment for experimental evidence of the law. 

Select the correct answer from A, B, C, D & E for the statement given below:

In Landolt’s experiment – the form in which the chemical energy stored up in the reactants __________ is released.

Select the correct answer from A, B, C, D & E for the statement given below:

The process of change of a liquid into vapour, [gas] on heating.