Question

The approximate composition of the atmosphere is shown in the pie-chart. Which statement BEST describes the chart? A) The chart shows the percentages of elements in a mixture. B) The chart shows the percentages of elements in a compound. C) The chart shows the percentages of pure substances in a mixture. D) The chart shows the percentages of compounds in a pure substance.

Answer 1

The pie chart is missing but going with how the atmospheric composition pie chart looks like in general:

A is wrong as some gases such as moisture and carbon dioxide are not elements.

B is wrong as air is not a compound.

D is wrong as air is not a pure substance.

The only answer left is C)  The chart shows the percentages of pure substances in a mixture.

Answer 2

The approximate composition of the atmosphere is shown in the pie-chart shows the percentages of pure substances in a mixture.

Atmosphere:

It is a mixture of different gases around the earth. This includes Nitrogen, Oxygen, Carbon dioxide etc.

• The constituent gases are not just elements some are compounds also such as Carbon dioxide.

• Atmosphere is the mixture of gases.

Hence, options A, B, and D are incorrect.

Therefore, the approximate composition of the atmosphere is shown in the pie-chart shows the percentages of pure substances in a mixture.

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