MyQuestionIcon

1

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

Glass

Painting a wo...

Question

Painting a wooden block or wall is a chemical change or not as there is a change in colour?

Open in App

Solution

The changing of color of a substance is not necessarily an indicator of a chemical change. For example, changing the color of a metal does not change its physical properties. However, in a chemical reaction, a color change is usually an indicator that a reaction is occurring. Painting the metal car does not changing the composition of the metallic substance

Suggest Corrections

thumbs-up

8

Similar questions

Q. What change in colour is observed when copper sulphate is heated? Is it chemical change or a physical one?

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

Water cycle is a natural change.Classify it as a physical or chemical change and reversible or irrerviersible change .Justify your statement.

Which of the following observations helps to determine whether a chemical reaction has taken place or not?

(i) Change in state.

(ii) Change in colour.

(iii) Change in shape

(iv) Evolution of gas.

(v) Change in temperature.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Glass

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Standard X Chemistry

Join BYJU'S Learning Program

CrossIcon