Prior learning: Yous should understand that everything is fabricated of atoms, and understand the differences between dissimilar types of cantlet. You lot should empathize the deviation between an atom and a molecule.

Element

An chemical element is a pure substance made upward of only one type of atom.  These atoms can be individual and carve up, like in Noble Gases such as helium. They may be joined to one another past chemical bonds, forming identical small groups of atoms called molecules . For example, the element chlorine consists of pairs of chlorine atoms chemically bonded together, so its chemic formula is Cltwo.

The periodic tabular array collects and organises all the known types of atom from which the elements are formed.

Compound

A chemical compound is a pure chemical substance, merely information technology is made from more than ane type of atom, chemically bonded together. All pure substances are either elements or compounds. It is non possible to dissever the atoms in a compound without breaking chemical bonds.

Mixture

A mixture contains more than than one chemical substance, and therefore is not pure . The substances in a mixture can be elements, compounds, or both. Unlike a chemical compound, the different substances in a mixture tin can be separated from one another without breaking whatever chemical bonds.  There are many physical ways of separating a mixture: the right one to use depends on the physical states of the substances in the mixture.

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Example

Air is a mixture of gases. It contains elements such as argon and oxygen, and compounds such as carbon dioxide.  Molecules of oxygen are fabricated from pairs of oxygen atoms chemically bonded together. Argon is made of individual argon atoms not joined to anything else.  Molecules of carbon dioxide are formed from i carbon atom and 2 oxygen atoms chemically bonded together.  Air can exist separated into the component gases in the mixture past cooling it until it liquifies, the slowly raising the temperature of the liquid air.  When the temperature reaches the boiling point of any substance in the mixture, information technology will eddy and can be nerveless as a pure gas, leaving the other components still in the liquid land.

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Copyright: Messer Gases for Life