Elements, Compounds, Mixtures

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Elements, Compounds, Mixtures

Mixtures

Do not have a fixed composition

Can be easily seperated into its components by physical methods

Two or more substances which are not joined together chemically

More than one element, more than one compound or elements and compounds together.

Compounds

Made up of different elements chemically combined in fixed composition by mass

Substance that is made up of two or more elements chemically joined together

Can only be seperated by chemical reactions.

Combined directly to form compounds in fixed proportions

Elements

Non-metals can be solid, liquid or gas at room temperature.

A pure substance that cannot be broken down into more simpler substances by chemical processes.

Most elements are metall and are solids at room temperature except for mercury. They have a high melting and boiling point,

Atoms and molecules

Elements are made up of tiny particles called atoms

Atoms are the smallest particles of an element that have the chemical properties of that element.

They are different from that of another element

Molecules are a groups of two or more atoms that are chemically combined

All elements appear on the Periodic Table.