test tube reactions

• what's the test for alkenes?

  bromine water

  orange -> colourless
• what's the test for aldehydes?

  tollens reagent

  silver mirror
• what's another test for aldehydes?

  fehlings solution

  blue -> brick red ppt
• what's the tests for carboxylic acids?

  sodium carbonate

  effervescence of co2 / bubble into lime water clear -> cloudy
• what is the test for primary and secondary alcohols and aldehydes?

  potassiumdichromate (K2Cr2o7) and dilute sulfuric acid

  orange to green
• what is tollen's reagent

  • aqueous ammonia and silver nitrate [Ag(NH3)2]+
  • silver ions are reduced to silver
  • conditions: heat gently
• what happens to the copper during a positive test of fehlings solution?

  blue copper 2+ ions reduces to copper(1)oxide