Classify the following as compounds and mixtures:
Air, sugar, tap water, brass, copper sulphate, gasoline

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Solution

Compound Mixture
Compounds are those substances that are formed by the chemical combination of two or more elements in a fixed proportion.
Compounds are always in homogenous form.
Copper sulphate $({CuSO}_{4})$ , Tap water $(H_{2} O)$ , Sugar $(C_{12} H_{22} O_{11})$ are examples of substances.
Mixtures are substances composed of different elements in any proportion that are not chemically combined.
Mixtures can be in homogenous or heterogenous forms.
Air, Brass, and Gasoline are examples of mixtures.

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Compound	Mixture
Compounds are those substances that are formed by the chemical combination of two or more elements in a fixed proportion. Compounds are always in homogenous form. Copper sulphate $({CuSO}_{4})$ , Tap water $(H_{2} O)$ , Sugar $(C_{12} H_{22} O_{11})$ are examples of substances.	Mixtures are substances composed of different elements in any proportion that are not chemically combined. Mixtures can be in homogenous or heterogenous forms. Air, Brass, and Gasoline are examples of mixtures.