Question

what is a pure substance​

Answer 1

Explanation:

A chemical substance is a form of matter having constant chemical composition and characteristic properties. Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., without breaking chemical bonds.

Answer 2

A pure substance is composed of only one type of element or compound. In other words, a pure substance is made up of only one type of molecules.

For example: oxygen, water, gold, salt (sodium chloride) are pure substances.

Characteristics of a pure substance

• It has are fixed chemical composition.
• It has a distinct set of physical and chemical properties.
• Its components cannot be separated by physical methods such as filtration and evaporation.
• It is homogeneous.
• Elements and compounds, both are pure substances.

- Elements are made up of same type of

atoms, For example: gold, hydrogen (H2)

oxygen (O2).

- Compoundsarmy and up of the same

type of molecules, i.e. two or more types

of atoms joined together by chemical

bonds. These atoms always combine in

the same ratio. For example: water (H2O), glucose (C6H12O6), carbon dioxide (CO2).