Question

11. Classify the following as physical and chemical changes. Give reason for your answer.
(a) Burning of Candle
(b) Melting of Ice
(C) Burning of petrol in an engine (d) Change of colour of iron bar on strong healing
(e) Churning of milk to get butler​

Answer 1

Answer:

a). both physical and chemical change. the solid wax melted to form liquid but some of it will convert into vapour wax.

b). physical change.

because the water produced by melting of ice can be again converted into ice.

c). chemical change.

because we can not convert the burned petrol product in petrol (e.g smoke)

d). chemical change

because when we heal any iron rod it from a new substance.

e). chemical change

because on churning of milk two phases are formed 1). fat and Unhomoginise products, 2). lighter particals are separated (water).

Answer 2

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