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Chemical Reactions

a change in w...

Question

a change in which the state as well as composition of a substance change with the evolution or absorption of energy is known as

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Solution

Dear student,
The answer is chemical change.
Chemical change is a change in which the state as well as the composition of a substance change with the evolution or absorption of energy.
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Q. A change that alters the composition of a substance is known as a chemical change.

Fill in the blanks :

(a) The process of a liquid changing into a solid is called_______________

(b) A change which alters the composition of a substance is known as a _______________ change

(c) There is no change in the ____________of the substance during a physical change.

(d) The reaction in which energy is evolved is called_______________

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2. New substance(s) is/are formed.
3. The chemical properties of the original substance remain the same.
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5. As a result of the change, there may or may not be any change in the energy possessed by the original substance.
6. There is no change in the chemical composition of the original substance.
7. The change is permanent and cannot be reversed by changing the conditions or through ordinary physical processes.
8. There may or may not be any change in the state, size, shape, colour, and smell of the substance that undergoes this change.
9. The composition and the properties of the parent substance or substances change.
10. There is usually a change in the mass of the parent substance/s as well.

Q. When a substance changes from one state to another, it absorbs or loses a large amount of heat without any change in temperature. What does this type of energy known as?

Q. The following are the observations of changes that have taken place. Align them to either chemical change or a physical change.

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