classify the changes involved in the following processes as physical or chemical changes:
a. photosynthesis -
b. dissolving sugar in water -
c. burning of coal -
d. melting of wax
e. beating aluminium to make aluminium foil -
f. digestion of food -
Answers
Explanation:
physical changes only lead to a change in the physical properties of the substance and are reversible. Chemical changes lead to a change in the composition or structure and are irreversible.
in nature.
(a) photosynthesis: irreversible, chemical changes.
6CO2 + CH2O = C6H12O6 + 6O2
(b) Dissolving sugar in water: irreversible, chemical change.
(c) Burning of coal. : irreversible, chemical change.
(d) Melting of wax: reversible by cooling, physical change.
(e) physical change as malleability ( beating metal into thin sheets ) does not change the composition.
(f) Digestion: chemical change, irreversible.
(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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