Chemistry Revision.

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Element Facts:

Around 100 elements.

All atoms are the same in the element.

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Compound Facts:

Compounds contain two or more different elements chemically combined in a fixed number.

Usually have totally different properties to the elements that they're made from.

To seperate a compound into an element you need to mae a chemical reaction.

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Mixture Facts:

In a mixture you have different elements or compounds not chemically combined together.

Use physical techniques to separate a mixture.

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Interpreting a chemical formula:

Examples:

MgS - Mg stands for Magnesium, S stands for Sulfur.No numbers mean you have 1x Magnesium and 1x Sulfur.

Na2SO4 - Na stands for Sodium, S stands for Sulfur and O stands for Oxygen.The 2 after the Na means you have 2x Sodium and the 4 after the O means there are 4x Oxygen. Na2SO4 - Stands for Sodium Sulfate, whereas Na2SO3 stands for Sodium Sulfite.

Ca(OH)2 - Ca stands for Calcium, O stands for Oxygen and the H stands for Hydrogen. 1x Calcium and 2x Oxygen and Hydrogen.