Edexcel International A Level Chemistry

Topic Questions

International A LevelChemistryEdexcelTopic Questions1. Structure, Bonding & Introduction to Organic Chemistry1.9 Alkanes

1.9 Alkanes

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Medium
11 mark

All alkanes have the same

  • empirical formula

  • general formula

  • molecular formula

  • structural formula

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21 mark

A single molecule of decane, C10H22 , is cracked.

Which of these mixtures could not be formed?

  • pentene and pentane

  • ethene, butene and butane

  • propene, propane and butene

  • hexene and propane

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31 mark

Which pollutant cannot form when alkane fuels are burned in car engines?

  • hydrogen chloride

  • sulfur dioxide

  • carbon particulates

  • carbon monoxide

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1a1 mark

Ethane reacts with bromine in the presence of ultraviolet radiation.

a)
What is the equation for the reaction?

  • C2H6 + Br2 → C2H4Br2 + H2

  • C2H6 + Br2 → C2H5Br + HBr

  • C2H6 + Br2 → 2CH3Br

  •  C2H6 + Br2 → CH4 + CH2Br2

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1b1 mark
b)
The ultraviolet radiation is needed for
(1)
  ☐ A homolytic breaking of a Br–Br bond
  ☐ B heterolytic breaking of a Br–Br bond
  ☐ C homolytic breaking of a C–H bond
  ☐ D heterolytic breaking of a C–H bond

  • homolytic breaking of a Br–Br bond

  •  heterolytic breaking of a Br–Br bond

  • homolytic breaking of a C–H bond

  • heterolytic breaking of a C–H bond

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2a1 mark

Methane reacts with excess chlorine in UV light.

a)

Which process occurs in the initiation step?

(1)

q10a-paper-1-oct-2021-edexcel-ial-chemistry

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2b1 mark
b)

Which of these molecules could not be formed in a termination step?

  • C2H6

  • CH3Cl

  • CH2Cl2

  • HCl

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3
Sme Calculator1 mark

When C20H42 is cracked, each molecule produces one molecule of ethene, one molecule of butane and two molecules of hydrocarbon E.

What is the molecular formula of E?

  • C7H13   

  • C7H14

  • C14H26

  • C14H28

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41 mark

Petrol, bioethanol and hydrogen are fuels.

All three of these fuels

  • burn to produce greenhouse gases

  • are overall carbon neutral

  • are overall sustainable

  • biodegrade rapidly

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5a1 mark

Cyclopentane undergoes free radical substitution with bromine.

a)
Which of these is an overall equation for this reaction?

  • C5H8 + Br2 → C5H8Br2

  • C5H10 + Br2 → C5H10Br2

  • C5H10 + Br2 → C5H8Br2 + H2

  • C5H10 + Br2 → C5H9Br + HBr

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5b1 mark
b)
Which statement is not correct about this reaction system?

  • only the initiation step involves homolytic bond fission

  • only some bromine is converted to free radicals in the initiation step

  • propagation forms more product than termination

  • further substitution reactions are likely to occur

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5c1 mark
c)
Which free radical is least likely to form in a propagation step in this reaction system?

  • C5straight H subscript 9 superscript •

  • Bstraight r to the power of •

  • C5H8Bstraight r to the power of •

  • straight H to the power of •

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5d1 mark
d)
Which alkane could be formed in a termination step in this reaction system?
   
q16d-paper-1-jan-2021-edexcel-ial-chemistry

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