Exercises
1. 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
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(e) Beating aluminium to make aluminium foil
(f) Digestion of food
2. State whether the following statements are true or false. In case a
statement is false, write the corrected statement in your notebook.
(a) Cutting a log of wood into pieces is a chemical change. (True/False)
(b) Formation of manure from leaves is a physical change. (True/False)
Answers
Answer:
a)chemical change as new substance formed.
b)physical as the change can be reversed
c)chemical as new substance is formed
d)physical and chemical both
e)physical change or no reaction occurs
f)chemical change as new substance formed.
2.a)True
b)False
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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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(a) False
Cutting a log of wood into pieces is a physical change.
(b) False
Formation of manure from leaves is a chemical change.
(c) True
(d) False
Iron and rust are different substances. Rust is iron oxide
(e) True