Question

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You must have heard of the ozone layer in our atmosphere. It protects us from the harmful ultraviolet radiation which come from the sun. Ozone absorbs this radiation and breaks down to oxygen. Oxygen is different from ozone. Can we call the breaking down of ozone a chemical change? If ultraviolet radiation were not absorbed by ozone, it would reach the earth’s surface and cause harm to us and other life forms. Ozone acts as a natural shield against this radiation. a) What is a chemical change? -1- b) How is ozone layer useful to us? -1- c) Pick an example of chemical change from the above passage -1- d) Ozone acts as a -------------------against radiation.

Answer 1

Answer:

invisible shield

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Answer 2

a) When the substance combines with another substance to form new substance, it is called chemical change.

b)Ozone protects us from the harmful ultraviolet radiation which come from the sun.

c) Breaking down of ozone is an example of chemical change.

d) Ozone acts as a natural shield against this radiation.