ICSE ICSE Class 7 - CISCE Question Bank Solutions

What do you observe when :

an iron nail is kept in tap water for few days

Fill in the blank

A new substance is always formed in a _______ change.

Fill in the blank.

Melting of ice is a _______ change.

True or false 

New substances are formed in a chemical change.

 Fill in the blank

A change in which the substance can be brought back to its original state is called a _______ change.

 Fill in the blank

A new substance is formed in a _______ change.

Name the main metal present in the following:

Haemoglobin           

Name the main metal present in the following:

Chalk   

Name the main metal present in the following:

 Chlorophyll

Name the main metal present in the following:

Chocolate wrappers

Give four examples of non-metallic elements.

What do you understand by :

Metalloids 

State four difference between compounds and mixtures.

Define:- Filtration

Why is it named so?

On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used

Filtration

On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used

Sedimentation and decantation

On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used

By using a separating funnel

Fill in the blank

_______ are made up of same kind of atoms.

Fill in the blank:

________ and _______ are pure substances.