ICSE ICSE Class 7 - CISCE Question Bank Solutions

State in which of the three states of matter:

The force of attraction between the particles is very weak.

State in which of the three states of matter:

The movement of the particles is neither about their own positions nor in any random direction.

Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.

Pressure

Give a reason why –

Solids have a definite volume & a definite shape.

Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.

Catalyst

Give a reason why –

Liquids have a definite volume but no definite shape.

Representation of the results of a chemical change – is a chemical equation.

For the equation: FeCl₃ + 3NH₄OH 3NH₄Cl + Fe(OH)₃ ↓

Answer the following:

Write the word equation for the above molecular equation.

Give a reason why:

Gases have no definite volume and no definite shape.

Representation of the results of a chemical change – is a chemical equation.

For the equation: FeCl₃ + 3NH₄OH 3NH₄Cl + Fe(OH)₃ ↓

Answer the following:

Is the equation given above a balanced equation. Give reasons.

Representation of the results of a chemical change – is a chemical equation.

For the equation: FeCl₃ + 3NH₄OH 3NH₄Cl + Fe(OH)₃ ↓

Answer the following:

Name the reactants and the products in the above equation.

Representation of the results of a chemical change – is a chemical equation.

For the equation: FeCl₃ + 3NH₄OH 3NH₄Cl + Fe(OH)₃ ↓

Answer the following:

What is the indications of the arrow between the reactants and the products and of the arrow pointing downwards at the end.

Give word equation for the following chemical reaction and give the names of the product formed.

Zn + 2HC1→ ZnCl₂ + H₂

Describe simple experiment to show that particles of matter are closely packed in solids and less in liquids.

Give word equation for the following chemical reaction and give the names of the product formed.

\[\ce{CuO + H2SO4 -> CuSO4 + H2O}\]

Give word equation for the following chemical reaction and give the names of the product formed.

Zn + S → ZnS

Give word equation for the following chemical reaction and give the names of the product formed.

ZnCO₃ → ZnO + CO₂

Give word equation for the following chemical reaction and give the names of the product formed.

NH₃ + HCl→ NH₄Cl

A crystal of iodine is placed in a closed flat bottom flask and heated. State how you would conclude from the observations seen, that interparticle space is minimum in solids and maximum in gases.

Give a reason why solids and liquids co-exist at their melting points.

Explain the term ‘interconversion of matter’ with ice as a starting material.