Which of the following represents effect/(s) of a chemical change?

Heat, light or any other radiation (ultraviolet, for example) may be given off or absorbed.

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Sound may be produced.

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A change in smell may take place or a new smell may be given off.

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All of the above.

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Solution

The correct option is D All of the above.
The following represents effect/(s) of a chemical change. Heat, light or any other radiation (ultraviolet, for example) may be given off or absorbed. Sound may be produced. A change in smell may take place or a new smell may be given off. A colour change may take place . A gas may be formed.

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Question 9

Which of the following statement is incorrect for a chemical reaction?
(a) Heat may be given out but never absorbed.
(b) Sound may be produced.
(c) A colour change may take place.
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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.
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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.

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