ICSE ICSE Class 7 - CISCE Question Bank Solutions for Chemistry

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.

State the term which refers to the conversion of a substance on heating from.

1. solid-state to liquid state
2. liquid state to vapour state
3. vapour state to liquid state
4. liquid state to solid-state.

Match the characteristics of the three states of matter in List I with their correct answer from List II.

Name the following:

The silvery residue obtained on heating mercury [II] oxide.

Name the following:

The gas evolved when a dilute acid is added to chalk [limestone].

Name the following:

Two non-metal which react explosively when brought in close contact.