Give two examples of pure substances

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Detailed Solution

Two examples of pure substances are distilled water (H₂O) and gold (Au).

A pure substance is made up of only one type of atom or molecule. It has a fixed composition and definite physical and chemical properties. Pure substances cannot be separated by physical means.

Examples

Example	Type	Reason
Distilled Water (H₂O)	Compound	Contains only hydrogen and oxygen in a fixed ratio of 2:1.
Gold (Au)	Element	Made up of only one kind of atom — gold.

Properties of Pure Substances

Uniform composition throughout.
Fixed melting and boiling points.
Cannot be separated into simpler substances by physical methods.

Types

Elements: Made of one type of atom (e.g., iron, oxygen).
Compounds: Made of two or more elements chemically combined (e.g., water, carbon dioxide).

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