ICSE ICSE Class 7 - CISCE Question Bank Solutions for Chemistry

Give reason We need to classify things .

Give reason Pure substances have fixed melting or boiling point .

Define the following term Element .

Differentiate between the following.

Liquids and gases .

Differentiate between the following.

Atoms and Molecules .

Fill in the blank

_______ can flow.

Fill in the blank

Water boils at ______

Fill in the blank

The temperature at which a liquid boils is called the _________point of that liquids

Fill in the blank

Liquids have no definite ______

Mention two uses of the following metals and non-metals 

Aluminium  

Mention two uses of the following metals and non-metals  

Gold 

Mention two uses of the following metals and non-metals 

Oxygen

Mention two uses of the following metals and non-metals 

Iodine    

State whether the following statement is True or False:

Only water can exist in three different states

 True or false.

If the container in which a gas is collected has an opening, the gas will flow out and spread itself indefinitely.

Write whether the following statement are true or false.

There is no difference between evaporation and boiling.

Give reasons 

Magnesium is used in fire works. 

Give reasons  

Aluminium is used in making aircrafts.  

Write whether the following statement are true or false.

All solids, on heating, first change to the liquid and then to the gaseous state always.

Give reasons 

Graphite is used in the leads of pencils