Atoms, elements, mulecules, compounds and mixtures
 


Atoms, elements, molecules, compounds, substances and mixtures
What is an element
what are chemical coumpounds
What are chemical substances
Types of mixturesSeparation of mixtures
Chemical formulae
Important matter terminology



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molecules


Substances

A substance is simply matter with definite chemical composition and distinct properties. It is matter that is characterized by a constant composition in terms of its molecules, formulae and atoms, as well as physical properties such as density, refractive index, electric conductivity, melting point, and so on.

A substance can be an element or a compound but NOT a mixture. It can also be matter that exists in its pure form, usually called a pure substance. A few examples of substances include Water (symbol for water), Hydrogen (Hydrogen symbol) and Neon (Ne).

Other examples of chemical substances commonly seen in pure form are salt (sodium chloride), diamond (carbon) and gold.

substances

The diagram above shows the classification of matter and where substances fit.

Substances cannot be separated into components by physical separation techniques. Some substances, like water, can be broken down into elements by a chemical reaction (to break chemical bonds). A substance can be solid, liquid, gas, or plasma.

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ubstances and molecules