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Cracking

Cracking. Lesson objective – to interpret primary data obtained by practical work carried out in groups. Success Criteria. You can draw a molecular formula for an alkane You can obtain primary data from an experiment while working in a group

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Cracking

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  1. Cracking Lesson objective – to interpret primary data obtained by practical work carried out in groups

  2. Success Criteria • You can draw a molecular formula for an alkane • You can obtain primary data from an experiment while working in a group • You can explain what is cracking and why it is important • You know that bromine water turns colourless when added to an alkene

  3. How does fractional distillation work?

  4. Order of fractions

  5. aluminium oxide catalyst gaseous product mineral wool soaked in oil Catalytic cracking in the lab Catalytic cracking can be done in the laboratory by heating mineral wool soaked in oil with a catalyst, producing a gas. What might this gas be?

  6. How does catalytic cracking work?

  7. What are alkenes? Alkenes are a family of hydrocarbon compounds with the general formula CnH2n. Alkenes are very similar to alkanes, but they have one important difference: they contain at least one double covalent bond between carbon atoms. • The simplest alkene is ethene. It has the formula C2H4. • The second simplest alkene is propene. It has the formula C3H6.

  8. decane (C10H22) + + pentane (C5H12) propene (C3H6) ethene (C2H4) Cracking decane Decane from the naphtha fraction can be cracked to form pentane (for use in petrol), propene and ethene. 

  9. A saturated compound only contains single covalent bonds between carbon atoms. An unsaturated compound contains at least one double covalent bond between carbon atoms. Saturated vs. unsaturated Alkanes are examples of saturated compounds. Alkenes are examples of unsaturated compounds. A test to distinguish between saturated and unsaturated compounds is to add red bromine water. In the presence of unsaturated compounds, the red colour disappears.

  10. True or false?

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