Question

classify the changes involved in the following process in as many ways as possible (I) photosynthesis (II) dissolving sugar in water (III) burning of coal (IV) beating aluminium to make aluminium for​

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

6H

12 O

6+6O 2

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

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

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

Explanation:

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Answer 2

Answer:

(a) Photosynthesis → Chemical change

(b) Dissolving sugar in water → Physical change

(c) Burning of coal → Chemical change

(d) Melting of wax → Physical change

(e) Beating aluminium to make aluminium foil → Physical change

(f) Digestion of food → Chemical change

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