Explain why copper is a pure substance but air is a mixture.

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Solution

Pure substances are the substances that are made up of only one kind of particles and have a fixed structure.

Copper consists of only copper atoms. Therefore, copper is a pure substance.

Mixtures are the substances that are made up of two or more substances mixed together in any proportion. They do not undergo any chemical change and the properties of individual substances are retained.

Air consists of 78% nitrogen, 21% oxygen, 0.04% carbon dioxide, 0.96% water vapour and other gases. Therefore, air is a mixture.

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