Question

9.(02.02 MC)

Answer 1

Answer:

Example A describes a physical change and Example B describes a chemical change.

Explanation:

Answer 2

Answer:

Example A describes a physical change and Example B describes a chemical change.

Explanation:

Physical Change                                                                                              

The changes that occur only due to change in shape or physical properties but their chemical or internal composition remain unchanged.  

These changes were reversible.

They have same chemical property.

These changes can be observed with naked eye.

Example :

Vegetables are chopped and converted into smaller pieces the composition remain same. It is physical change.

Water converting to Ice

Water converting to gas

In this water molecule remain the same only they rearrange themselves that change its state of mater not composition

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible

These changes occur due to chemical reactions

These may not be observed with naked eye

Example:

Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood

Boiling of egg: that change the chemical composition of protein in the egg .

Food is broken up into simpler form during digestion and convert into the energy and particles which are different from original compound .