Quiz on "Cracking Oil to make Alkanes and Alkenes"

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1a. Larger hydrocarbon molecules can be broken down into more useful molecules by a process called . To break the molecules down the hydrocarbons from oil are heated to them and the hot vapours (gases) are passed over a heated to make the process , so it is more efficient. Breaking compounds down by heat in this way is an example of a reaction known as a (meaning 'breaking down with heat').

2. There are several types of hydrocarbons formed in this reaction and the products include alkanes with no double bonds and alkenes which have a carbon-carbon double bond.

3. CnH2n+2 is the general formula for the series of molecules known as and
CnH2n is the general formula for the series of molecules known as where n is the number of atoms in the .

4a. Image151.gif is an example of an .
4b. Image925.gif is an example of hydrocarbon called an , which is an molecule because it has a carbon-carbon bond.
4c. Image931.gif is an example of an .
4d. Image207.gif is an example of an , a type of hydrocarbon described as a molecule because it has all carbon-carbon bonds.