Question

In preparation of recipes at your home,
Identify any two changes that (a) can be reversed
(b) cannot be reversed.​

Answer 1

Answer:

(a) milk to milk powder

(b) kneading a dough

Explanation:

(a) we can convert milk into milk powder

we can also convert milk powder into milk so this is a change that can be reversed

(b) we can turn wheat flour into a dough

but we cannot convert the dough into wheat flour again so this is a change that cannot be reversed

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Answer 2

(a) Boiling of water & freezing of ice-cream

(b) Frying of chips & baking of bread.

Explanation:

(a)

Boiling of water

The boiling of water can be reversed by condensing it on some cold object and precipitating it into a container in the form of water again.

Freezing of ice-cream

Frozen ice-cream can be turned back into the solution by simply removing it from the freezer and the heat enters the ice-cream to melt it.

(b)

Frying of chips is a permanent change, the fried chips can't be turned back to raw by any means because it has gone through a chemical change in its molecular structure.

Baking of bread is also a permanent change and cannot be reversed due to the fact that the molecules of the wheat have changed now after the baking conditions.

TOPICS: chemical change, physical change, molecules

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