Alkenes Addition Reactions

• With bromine: (the test for saturation)

  e.g. ethene (g) + bromine (aq) → 1,2-dibromoethane (l)
• With steam: forms alcohols with heat, pressure and a catalyst

  e.g. ethene (g) + steam (g) ⇌ ethanol (l)
• With hydrogen: double bond breaks down to for an alkane with heat, pressure and a catalyst

  e.g. ethene (g) + hydrogen (g) → ethane (g)