Chemistry Unit 3

1) Periodic table
2) Acids and bases
3) Water
4) Energy and Chemical reactions
5) Identifying anf and analysing substances

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  • Created by: Aaron
  • Created on: 24-05-11 16:44

The Periodic Table

  • The elements are in order of atomic number
  • Elements with the same porperties are sorted into groups

John Newlands (1864)

  • He only knew of the existence of 63 elements
  • He arranged them in order of relative atomic mass
  • He found similar properties amongst every eighth element in the seris

Dimitri Mendeleev (1869)

  • He left gaps to accomidate new discoveries

Modern table

  • Now a useful tool


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Group One and Seven

The Alkali Metals

  • Very reactive with oxygen and water
  • Include: Lithium, Sodium and Potassium
  • Whe they react with non-metals they form ionic compounds
  • In water they form a metal hydroxide and hydrogen gas
  • They dissolve in water to form an alkali solution
  • Potassium reacts so aggressively it sets on fire
  • They get more reactive the lower down the group 

The Halogens

  • There are five non-metals in the Group
  • Chlorine is the most reactive element in Group 7
  • A more reactive halogen will displace a less reactive one
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