Pure Compound: A pure compound is a substance that contains only one type of molecule. The molecules in a pure compound are all the same in terms of their composition and structure. Examples of pure compounds include water (H2O), table salt (NaCl), and sugar (C12H22O11).

Petrol: Petrol, also known as gasoline, is a mixture of hydrocarbons that is used as fuel for internal combustion engines. Petrol is a complex mixture of different hydrocarbons, including alkanes, cycloalkanes, and aromatic hydrocarbons.

Steel: Steel is an alloy of iron that contains carbon and other elements. Steel is stronger and harder than iron, and it is used in a wide variety of applications, including construction, automotive, and manufacturing.

Ethanol: Ethanol, also known as ethyl alcohol, is a type of alcohol that is produced by the fermentation of sugars. Ethanol is used as a fuel, a solvent, and a disinfectant.

Tap Water: Tap water is water that is delivered to homes and businesses through a public water supply system. Tap water can contain a variety of dissolved minerals and chemicals, including calcium, magnesium, sodium, and fluoride.