Question

7. Identify the following changes as chemical or physical
a. Crumpling a sheet of aluminium foil
b. Baking a cake
c. Shredding paper
d. Sublimation of dry ice
e. Changing colour
f. Burning of paper​

Answer 1

Answer:

chemical reaction are,....... banking of cake, crumpling of a aluminium foil ,changes in colour,and all

excepting option d

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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