Explanation:

Elements and Compounds are both examples of pure substances.

Elements: fundamental substances cannot be separated into simpler substances by chemical methods.

Example: Iron metal and Oxygen gas

Compound: substance composed of two or more elements in fixed proportions can be separated into simpler substance and elements only by chemical methods.

Example: Table salt and Aluminium Oxide

Homogeneous and Heterogeneous are both example of mixture.

Homogeneous: mixture having a uniform composition and properties throughout (also called a solution)

Example: Coffee and Apple juice

Heterogeneous: Mixture not uniform in composition and properties throughout.

Example: Salad dressing and Chocolate chip ice cream

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