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Physical and Chemical Changes

Fill in the b...

Question

Fill in the blank :

Chemical changes are :

(a) always reversible. (d) mostly reversible

(b) always irreversible

(c) mostly irreversible

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Solution

Chemical changes are mostly irreversible.

Many chemical reactions are NON-REVERSIBLE CHANGES. Some chemical reactions can be reversed, and re-formed into the original substances. These are REVERSIBLE CHANGES.

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Similar questions

Chemical changes are mostly irreversible.

Q. Changes, in which new substances with different properties are formed, are called

(a) physical changes
(b) chemical changes
(c) irreversible changes
(d) reversible changes

Four students have their own opinion about reversible and irreversible changes. Who among the following is correct?

Rohan: Both physical and chemical changes are reversible.

Sam: Both physical and chemical changes are irreversible.

Tom: Physical changes are irreversible and chemical changes are reversible.

Riah: Chemical changes are irreversible and physical changes are reversible

Q. Fill in the blanks with the correct words.
1. Melting of ice-cream is an example of a/an .................... (reversible/irreversible) change.
2. Ripening of fruits is an example of a/an .................... (reversible/irreversible) change.
3. Cooking of foood is an example of a/an .................... (reversible/irreversible) change.
4. Breaking of glass is a .................... (physical/chemical) change.
5. .................... (Heating/Cooling) causes steam to change into water.

Q. Give one example for each of the following types of changes:
(a) physical changes.
(b) chemical changes
(c) reversible changes
(d) irreversible changes

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