ICSE ICSE Class 7 - CISCE Question Bank Solutions for Chemistry

Give reason for the following:

The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌} 
between the reactants and products, formed in the chemical reaction.

Explain in brief the involvement of energy in physical and chemical changes.

Fill in the blanks with the appropriate words of the statement  given below:

Chemical changes may involve exchange of energy in the form of __________ and _________.

Fill in the blank with the correct word of the statement given below:

Ammonium chloride, a sublimable solid undergoes _________ on heating.

Name the following:

The products obtained during ‘photosynthesis’ – which is a chemical change.

Name the following:

The type of change physical or chemical involved – ‘during respiration in human beings’.

State the meaning of the term Air

State the meaning of the term atmosphere.

Name the important scientists and their studies which led to the discovery of the components of air.

Explain Lavoisier’s experiment which provided evidence to the discovery of components in air.

Explain the term ‘air pollution’, with reference to air quality. State the sources of a few main pollutants.

Match the statements in List I with the correct answer from List II.

Fill in the blank:

Nitrogen of the air is utilized by plants for formation of _____.

Fill in the blank:

The gas evolved as a product of combustion as well as respiration is ______.

Fill in the blank:

A candle burns in a jar of oxygen, but gets extinguished in ______

Air has variable composition and hence there is ______ oxygen at lower altitudes than at higher altitudes.

Fill in the blank:

Rusting is a chemical reaction which involves _____ oxidation.

Draw a neat labelled diagram for the following experiment.

To determine the component of air used up in burning, by using phosphorus and a bell jar.

Draw a neat labelled diagram for the following experiment.

To prove that oxygen is non-combustible, but supports combustion.

Draw a neat labelled diagram for the following experiment.

To study the presence of carbon dioxide in air.