MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

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

Open in App

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.
Regards

Suggest Corrections

thumbs-up

0

Similar questions

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_______________

Q. Following are the observations of changes that have taken place. Classify them into chemical change or a physical change. [5 MARKS]

1. The change is temporary and can be reversed by changing the conditions in most of the cases.
2. New substance(s) is/are formed.
3. The chemical properties of the original substance remain the same.
4. There is an exchange of energy during this change which means that heat and light may be given out or absorbed.
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.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Laws of Chemical Combination

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Chemical Reactions

Standard IX Chemistry

Join BYJU'S Learning Program

CrossIcon