Question

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
(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)
(c) Iron pipes coated with zinc do not get rusted easily. (True/False)
(d) Iron and rust are the same substances. (True/False)
(e) Condensation of steam is not a chemical change. (True/False)

Answer 1

Answer:

Beating of aluminium metal to make aluminium foil is a physical change.

This is a chemical change, because in this reaction new substances are formed. Question 5: When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place

Answer 2

Explanation:

1

.chemical change

.physical change

.chemical change

. Physical change

. physical change

. chemical change

2

false

false

true

false

true