ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

Name: the Hardest Naturally Occurring Substance

Name: an Inert Gas

Differentiate between displacement reaction and a neutralization reaction.

Classify the following reaction into – 

1. Direct combination 
2. Decomposition
3. Displacement
4. Double decomposition

The reaction is – Zinc sulphate reacts with ammonium hydroxide to give ammonium sulphate and zinc hydroxide.

Represent with the help of a simple chart how matter is classified into pure or impure substances & further into elements, compounds & mixtures, with elements further segmented.

Define the terms elements, compounds & mixtures with a view to show their basic difference.

‘An atom is the basic unit of an element’. Draw a diagram of an atom – divisible as seen today.

‘The modern periodic table consists of elements arranged according to their increasing atomic numbers’. With reference to elements with atomic numbers 1 to 20 only in the periodic table – differentiate them into – metallic elements, metalloids, non-metals & noble gases.

Elements are broadly classified into metals and non-metals. State six general differences in the physical properties of metals and non-metals. State two metals and two non-metals which contradict with the general physical properties – giving reasons. State one difference in property between metalloids and noble gases.

With reference to elements – define the term ‘molecule’. Give two examples each of a monoatomic, diatomic & polyatomic molecule.

Define the term ‘compound’. In the compound carbon dioxide – the elements carbon & oxygen are combined in a fixed ratio. Explain.

State five different characteristics of compounds.

Give three differences between elements & compounds with relevant examples.

Explain the term ‘mixture’.

Differentiate between homogenous & heterogeneous mixtures.

State why brass is considered as a homogenous mixture while a mixture of iron & sulphur – heterogenous.

Give an example of two liquids which form homogenous.

Give an example of two liquids that form heterogeneous mixtures.

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

A diatomic molecule.

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

A metalloid.