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Chemistry µGCSE:

Alkanes+Alkenes

10 quick questions - for GCSE and iGCSE

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10 minutes maximum! (can you do it in 5?)  
1. The general formula for the alkane homologous series is ……
  • A.   CnH2n + 2
  • B.   CnH2n
  • C.   CnH2n + 1
  • D.  CnH2n - 2
2. A hydrocarbon is ….
  • A.  any compound obtained from crude oil
  • B.  an alkane or alkene
  • C.  a compound containing carbon and hydrogen
  • D.  a compound containing only carbon and hydrogen
3. The names of the first four members of the alkane family in order of decreasing number of carbon atoms are …
  • A.   methane, ethane, propane, butane
  • B.   methane, ethane, butane, propane
  • C.   butane, propane, ethane, methane
  • D.   propane, butane, ethane, methane
4. Members of a homologous series have similar chemical reactions. They also have ..
  • A.  the same functional group
  • B.   the same general formula
  • C.   physical properties which show a gradual change
  • D.   all of the above

5. Molecules in the alkene homologous series have the following general formula and functional group:

  General Formula Functional group
A CnH2n + 2 C-H bond
B CnH2n + 2 C=C bond
C CnH2n C-H bond
D CnH2n C=C bond

6. Hydrocarbons can be saturated or unsaturated. Which of the following is true for alkanes and alkenes?

  Alkanes Alkenes
A saturated unsaturated
B saturated saturated
C unsaturated unsaturated
D unsaturated saturated

 

Q7–9. The structures of four molecules, W, X, Y and Z, are shown below:


4 x hydrocarbon diagrams

 

7. Which molecule(s) will decolourise bromine water immediately?

  • A.   X only
  • B.   Y only
  • C.   X and Y
  • D.   W and Z
8. Which molecule(s) are unsaturated?
  • A.   X only
  • B.   Y only
  • C.   X and Y
  • D.   W and Z
9. The complete combustion of all these compounds produces ..
  • A.   carbon monoxide and hydrogen
  • B.   carbon monoxide and water
  • C.   carbon dioxide and hydrogen
  • D.   carbon dioxide and water

 

10. The correct equation for the reaction between ethene and bromine is ……

  • A.  C2H6 + Br2  C2H5Br + HBr
  • B.  C2H4 + Br2  C2H2Br2 + H2
  • C.  C2H4 + Br2  C2H4Br + HBr  
  • D.  C2H4 + Br2  C2H4Br2