Cracking Alkanes

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4 Terms

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Outline the procedure

  • forms liquid and gaseous shorter hydrocarbons

  • heated catalyst - thermally decomposes longer chain hydrocarbons

2
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Explain the procedure

  • place some mineral wool at bottom of boiling glass - press down using glass rod

  • add enough liquid paraffin to wool so it is soaked

  • clamp boiling tube near mouth (tilt it slightly upwards) and add catalyst (porcelain chips) to centre of test tubes

  • place delivery tube inside

  • fill trough - take 4 test tube and place one submerged in water

  • Bunsen burner - heat catalyst for few min (until dull red colour)

  • flick flame towards mineral wool once in a while

  • meanwhile - collect the gas - invert test tube over delivery tube and seal them - remove them and store in racks

  • test for alkenes - shake with bromine water goes from orange to colourless

3
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What is the test for alkene

  • shake with bromine water

  • goes from orange to colourless

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