Which statement identifies why oxygen is classified as a pure substance and air is classified as a mixture?Immersive Reader
Oxygen is more reactive than air.
Oxygen has a higher density than air.
Oxygen goes under a phase change, whereas air is always a gas.
Oxygen contains only one substance, but air contains several substances.
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Because oxygen contains only one substance,but air is a mixture of several substances
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1
Oxygen contains only one substance, but air contains several substances is the statement that identifies that oxygen is classified as a pure substance and air is classified as a mixture.
- Pure oxygen gas is considered as an element and not a compound even when it is made up of molecules. This is because the molecules of oxygen contains only one kind of element. On the other side, compounds contain more than one element.
- Air is not a compound, it is a mixture as the mixture has no fixed formula likewise air also has no fixed formula, but the formula of any compound is fixed.
- Air is formed if several gases like nitrogen oxide, carbon dioxide etc and there is no change in energy.
- Separation of the air components can be done by physical means.
Hence, the correct option is d.
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