States of Matter and Their Properties
Solids, liquids and gases: how their particles behave and how matter changes state.
Chemistry
Study guides, exam tips and subject breakdowns.
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Chemistry
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Chemistry
Atomic Structure and the Periodic Table
Protons, neutrons and electrons, and how elements are arranged in the periodic table.
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Chemistry Premium
Chemical Bonding Made Simple
Ionic, covalent and metallic bonds explained with easy examples.
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Chemistry
Acids, Bases and Salts
What acids and bases are, the pH scale, and how salts are formed.
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Chemistry
The Mole Concept
The mole as a way to count atoms and molecules, with the key formula.
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Chemistry
Rates of Reaction
What makes chemical reactions go faster or slower.