Question

.Classify each of the following as a physical or chemical change. Give reasons.
a) Drying of a shirt in the sun
b) Rising of hot air over a radiator
c) Burning of kerosene in a lantern
d) Change in the colour of black tea on adding lemon juice to it
e) Churning of milk cream to get butter.

Answer 1

Answer:

physical change : 1, 2

chemical changes: 3,4,5

Explanation:

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Answer 2

Answer:

1.Drying of shirt in the sun is a Physical change. Since in this change no new substance is formed.

2.Since, in rising of hot air over a radiator no new substance is formed, hence it is a Physical change.

3.While burning of kerosene in a lantern carbon dioxide, and water vapour is formed, hence it is a Chemical change.

4.In this change a new substance is formed, hence it is a Chemical change.

5.Churning is the process of shaking up cream or whole milk to make butter, usually using a butter churn. In Europe from the Middle Ages until the Industrial Revolution, a churn was usually as simple as a barrel with a plunger in it, moved by hand. These have mostly been replaced by mechanical churns.