ICSE ICSE Class 7 - CISCE Question Bank Solutions for Chemistry

Define: Chemical bond

Define: Mass number

Define: Relative atomic mass

What does an atom consist of ? Explain.

 Give the charge and the mass of an electron, proton and neutron present in an atom ?

Name two particles found inside the nucleus. What are they collectively called ?

State what you would observe when the following substance is heated in a glass test tube red lead.

State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .

 Name the particles which revolve around the nucleus.

Explain the following reaction with one suitable example of Combination reactions .

What are orbits or shells ?

What is the maximum number of electrons present in:

1. first shell
2. second shell
3. third shell and
4. fourth shell

Explain the following reaction with one suitable example of Decomposition reaction

Name three non-metals/radicals which have valency -1, -2, and -3.

Explain the following reaction with one suitable example of Displacement reaction.

Explain the following reaction with one suitable example of Double decomposition reaction.

Name the type of chemical reaction shown by the following equation:

CaCO₃ → CaO + CO₂

Define: Covalent bond

Name the type of chemical reaction shown by the following equation:

2Mg + O₂ → 2MgO

Name the type of chemical reaction shown by the following equation:

Fe + CuSO₄ → FeSO₄ + Cu