5. A change that cannot be reversed is called ________ change.

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Solution

A change that cannot be reversed is called irreversible change.
A change that cannot be reversed or cannot get back to its original state is called a irreversible change.
For example, burning of paper is an irreversible change because a paper turns into ash on burning and ash cannot be reversed back to paper again.
Therefore, a change that cannot be reversed is called irreversible change.

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Question 8

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(a) physical change that can be reversed
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(c) physical change that cannot be reversed
(d) chemical change that cannot be reversed

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Question 5

Salt can be separated from its solution (salt dissolved in water) because
(a) mixing of salt in water is a change that can be reversed by heating and melting of salt
(b) mixing of salt in water is a change that cannot be reversed
(c) mixing of salt in water is a permanent change
(d) mixing of salt in water is a change that can be reversed by evaporation

show that a physical change can easily be reversed??

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