prep of ethene

• reaction type

  elimination

  saturated to unsaturated

  tetrahedral to planer

  dehydration
• ethanol

  liquid at room temp

  flammable
• aluminum oxide

  white powder

  catalyst

  dehydrating agent
• ethene

  colourless gas

  pure covalent
• water

  byproduct to be discarded
• glass wool

  added last

  soak up all ethanol

  clean sides of boiling tube
• suck back- heating in a closed system


  remove delivery tube from trough as bunsen burner is removed to let air into apparatus to prevent suckback of water from trough due to partial vacuum which could cause hot boiling tube to shatter because of rapid cooling
• precautions

  suckback

  ethanol is flammable -heat catalyst aluminum oxide

  ethene is flammable -keep away from bunsen burner -safety screen

  discard first testtubes of air as they contain expanded air
• flame

  bright, luminous, yellow, sweetish smell