Question

1 al classify the following in to physical and chemical change 1 Digestion of food 2 Burning of food 3 Melting of Ice 4 Photosynthesis 5 Ruting of Iron 6 Burning of Fuel​

Answer 1

Answer:

Physical changes only lead to changes in physical properties of the substance and are reversible chemical changes lead to change in composition or the structure and are irreversible in nature.

(a) Photosynthesis: irreversible, chemical changes.

6CO

2

+6H

2

O⟶C

6

H

12

O

6

+6O

2

(b) Dissolving of water : reversible, physical change.

(c) Bumping of coal − irreversible, chemical change.

(d) Melting of wax − reversible by cooling, physical change.

(e) Physical change as mallacbility (beating metal into then sheets) does not change composition.

(f) Digestion − chemical change.