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Chapter 9 Practice Paper: Fuels, Hydrocarbons and Alkenes — question paper

QuizQuipPractice Series
QQ/S4CH/CH9

Secondary 4 · Chemistry (G2 / G3)

Chapter 9 Practice Paper

Fuels, Hydrocarbons and Alkenes

Duration: 40 minutes
Total: 30 marks
Name:
Class:
Register No.:
Date:

READ THESE INSTRUCTIONS FIRST

  • Write your name, class and register number in the spaces at the top of this page.
  • Answer all questions.
  • Give numerical answers correct to 3 significant figures unless stated otherwise, with units where a quantity is calculated.
  • Chemical equations should be balanced, with state symbols shown where the question asks for them.
  • The number of marks is given in brackets [ ] at the end of each question or part question.
  • The total number of marks for this paper is shown on its cover.

Original practice material written for the MOE Chemistry syllabus. It is not an official MOE or school examination paper. Chapter 9 (fractions, alkanes, alkenes, bromine water, cracking).

For Examiner’s Use
Section A/ 10
Section B/ 20
Total/ 30

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

  1. 1

    Which property decreases for fractions from the bottom to the top of the fractionating column?

    1. Avolatility (ease of evaporation)
    2. Bviscosity
    3. Cboiling point range
    4. Dmolecular size
    ( )
  2. 2

    Which formula represents an alkene?

    1. AC₂H₆
    2. BC₃H₈
    3. CC₄H₈
    4. DCH₄
    ( )
  3. 3

    Methane and chlorine are mixed in a dark cupboard. After an hour the mixture

    1. Ahas fully reacted to chloromethane
    2. Bshows no reaction
    3. Chas exploded
    4. Dhas turned to ethanol
    ( )
  4. 4

    The reaction C₂H₄ + Br₂ → C₂H₄Br₂ is an example of

    1. Asubstitution
    2. Bcombustion
    3. Ccracking
    4. Daddition
    ( )
  5. 5

    Butane, C₄H₁₀, undergoes cracking. Which pair of products is possible?

    1. Amethane and ethene
    2. Bbutene and hydrogen
    3. Cethane and ethene
    4. Dethene and propene
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided. Include state symbols where the question asks, and balance every equation.

  1. 1

    Crude oil is separated in a fractionating column running from about 400 °C at the base to about 40 °C at the top.

    1. (a)

      Explain why the crude oil must be vaporised before entering the column.

      [2]
    2. (b)

      State where in the column bitumen is collected and one use of bitumen.

      [2]
    3. (c)

      State and explain the trend in flammability from refinery gas to bitumen.

      [2]
  2. 2

    Ethene is the simplest alkene; ethane the simplest alkane.

    1. (a)

      Describe a chemical test that distinguishes the two gases, giving the result for each.

      [3]
    2. (b)

      Write the equation for ethene reacting with hydrogen, stating the catalyst.

      [2]
  3. 3

    Dodecane, C₁₂H₂₆, is cracked over hot aluminium oxide.

    1. (a)

      Dodecane cracks to give ethene and one other hydrocarbon. Deduce the formula and family of the other product.

      [3]
    2. (b)

      Write the full equation for this cracking reaction.

      [2]
  4. 4

    A student compares the combustion of propane, C₃H₈, in a plentiful air supply and in a limited air supply.

    1. (a)

      Write the equation for complete combustion of propane.

      [1]
    2. (b)

      Name the two harmful products of incomplete combustion and state one danger of each.

      [3]

— End of paper —