O-LevelChemistryOrganic Chemistry5070/21 · Oct/Nov 2021 · Q47 Marks
Alkenes are a homologous series of hydrocarbons.
- (a)Alkenes are produced by cracking. State the meaning of the term cracking.[2]
- (b)(i)Margarine is manufactured from vegetable oils using a nickel catalyst. Name the other reactant used in this reaction.[1]
- (b)(ii)State the type of chemical reaction which occurs when margarine is manufactured from vegetable oils.[1]
- (c)Ethanol is produced by the reaction of ethene with steam. Construct the equation for this reaction.[1]
- (d)An organic compound contains 54.5% carbon, 9.10% hydrogen and 36.4% oxygen by mass. Calculate the empirical formula of this compound. empirical formula[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2021). The mark or mark type is shown in brackets.
- [1] 4(a) breakdown of (long chain) alkanes / decomposition of (long chain) alkanes
- [1] 4(a) into shorter chain (hydrocarbons) / by heat / thermally
- [1] 4(b)(i) hydrogen
- [1] 4(b)(ii) addition
- [1] 4(c) C2H4 + H2O → C2H5OH
- [1] 4(d) C H O; 54.5 9.10 36.4; 12 1 16; OR 4.54 9.10 2.275
- [1] 4(d) C2H4O
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