2.7 describe the relative reactivities of the elements in Group 1

  • Group one metals get more reactive as you go down the group
  • Exothermic – release of heat from a reaction
  • Effervecence – bubbles

Lithium

  • Less dense than water
  • Fizzes gently (bubbles given off are hydrogen)
  • Gradual reaction (disappears)
  • End product is lithium hydroxide

Sodium

  • Less dense than water
  • Exothermic enough to melt the sodium
  • Pushed around the bowl by the hydrogen given off
  • End product is sodium hydroxide

Potassium

  • Less dense than water
  • Sets light to the hydrogen
  • A lilac flame is produced
  • End product is potassium hydroxide

 

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