Part One

• What are halogens

  Very reactive non metals
• What do halogen exist as?

  Diatomic molecules under normal conditions
• how does the size of the molecules change down the group

  Get larger
• What are halogens called when they gain an electron to become an ion

  Halide io
• What is fluorine as a halide

  Fluoride
• What colour is fluorine and it’s physical state of element at a room temperature temperature

  a yellow gas
• What colour is chlorine and it’s physical state of element at a room temperature temperature

  Green gas
• What colour is bromine and it’s physical state of element at a room temperature temperature

  Orange / brown liquid
• What colour is iodine and it’s physical state of element at a room temperature temperature

  Black solid
• What’s the trend in boiling point down the group

  Increases due to a larger atomic radius, so more electrons , so stronger vdw forces between molecules
• what’s the trend in ionic radius down the group

  There’s more shells , so more shielding , so more repulsion called by extra electrons in each shell
• what’s the trend in electronegativity down the group?

  The increases so shielding increases, outer electrons are further away so nuclear attraction decreases
• What’s the colour of chlorine solution in an aqueous solution

  Pale green
• What’s the colour of bromine solution in an aqueous solution

  Yellow / orange solution
• What’s the colour of iodine solution in an aqueous solution

  Brown solution
• What’s the chlorine test

  Damp blue litmus paper turns red then white
• Why’s iodine insoluble in water

  It’s non polar
• Why do you need to remove carbonate ions

  If they react with ag it forms a white ppt

  Ag2+ (aq) + CO3 2- (aq) —> Ag2CO3 (s)
• What test is for solutions only

  Adding aqeous Nacl, Nabe, NaI
• What tests are for iOns

  The ones with AgNO3 and dilute and concentrated ammonia