Question

Physical and chemical change chapter based question

Answer 1

Explanation:

Physical Change :

Physical change is reversible change.

There is change in physical properties of the substance, for example shape, size, color etc.

There is no new product is formed.

For example

Melting / Freezing of water.

Melting of wax.

Melting of ice etc.

Chemical change  :

Chemical change is irreversible change.

There is change in chemical properties and composition of the substance.

There is new product is formed.

For example :

Rusting of iron.

Digestion of food

Formation of curd, etc

Answer 2

• what is rust ?
• what type of change is rust?
• what type of changes is photosynthesis?
• chemical change in which new substance with different properties is formed is known as ______________ .
• __________is a property by

virtue of which metal can be beaten into thin sheets without breaking.

write the chemical formula of blue vitriol ?

• state the two important conditions for rusting
• what is freezing point of water
• what is freezing point of water
• what is melting
• name the process by which water molecules continuously change into vapour.
• at what temperature water evaporate
• what is the boiling point of water
• in physical change a new substance is formed true or false
• extraction of metal is chemical process or physical process