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The number 6·023×10 23 is called Avogadro’s number (N A ).

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Some Basic Concepts of Chemistry

Short Answer Type

21.

Oxides of carbon illustrate which law of chemical combination?

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22.

Name three elements which make up more than 90 percent of the human body.

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23.

When two substances X and Y are mixed together, a new substance Z is formed with the evolution of heat. Properties of Z are different from those of X and Y. Is Z an element, compound or a mixture?

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24.

If water samples are taken from sea, rivers, clouds, lakes or snow, they will be found to contain hydrogen and oxygen in the appropriate ratio of 1 : 8. This illustrates which law of chemical combination?

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