MYP 10

Unit 10.5.4: Cracking


  • To know that cracking breaks longer chain alkanes and produces a mixture of products at least one of which must be an alkene
  • To know that cracking is a random process
  • To know that cracking is carried out in industry to make useful compounds from less useful hydrocarbon fractions
  • To see cracking in the laboratory

Class activity

Demonstration of cracking of hexane.

Cracking in the laboratory

Student activity

Diagram of apparatus with explanation of function.

1. Draw the structural representation of the saturated hydrocarbon that contains 8 carbon atoms in a straight (unbranched) chain.

2. Using this structure as a starting material, draw out 5 different cracking reactions.

3. Draw three different isomers of C8H18

4. Why do we need a special naming system for organic chemicals?

5. Explain the meaning of the terms underlined in the sentences above.

6. Research and make bullet point notes on the industrial conditions required for cracking.

7. Why is cracking a very important industrial process?



Teaching notes

Rocksil wool, broken house brick, delivery over water.

Test products with bromine water.




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