Edexcel IGCSE Chemistry Topic 4: Organic Chemistry Alkanes Notes
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Questions and Answers

Why are alkanes classified as saturated hydrocarbons?

  • Each carbon has formed its maximum of 4 single bonds (correct)
  • They contain C=C double bonds
  • They consist of triple bonds
  • They have an unsaturated structure

    • How many single bonds does each carbon in an alkane typically form?

  • 4 (correct)
  • 1
  • 2
  • 3

    • Which of the following alkanes is correctly matched with its formula?

  • Propane - CH3CH3CH3
  • Ethane - CH3CH3 (correct)
  • Butane - CH3CH2CH2CH3
  • Methane - CH3CH3

    • What is the general formula for alkanes?

    <p>CnH2n+2 (D)</p> Signup and view all the answers

    What type of bonds are absent in alkanes?

    <p>Double bonds (C)</p> Signup and view all the answers

    Which alkane has the displayed formula CH3CH2CH2CH2CH3?

    <p>Pentane (A)</p> Signup and view all the answers

    What is the general formula for alkanes with 'n' carbon atoms?

    <p>CnH2n+2 (B)</p> Signup and view all the answers

    Why are alkanes classified as saturated hydrocarbons?

    <p>Their carbons have formed maximum single bonds (D)</p> Signup and view all the answers

    Which alkane is represented by the displayed formula CH3CH2CH3?

    <p>Propane (A)</p> Signup and view all the answers

    How many carbon atoms are present in a molecule of butane?

    <p>4 (D)</p> Signup and view all the answers

    What is the structural formula of pentane?

    <p>CH3CH2CH2CH3 (A)</p> Signup and view all the answers

    Which alkane has the molecular formula C2H6?

    <p>Ethane (C)</p> Signup and view all the answers

    How many single bonds does a carbon atom typically form in alkanes?

    <p>4 (D)</p> Signup and view all the answers

    Which alkane has the displayed formula CH3CH2CH2CH3?

    <p>Butane (D)</p> Signup and view all the answers

    What type of bonding makes alkanes saturated hydrocarbons?

    <p>Single bonds (C)</p> Signup and view all the answers

    Flashcards

    Saturated hydrocarbon definition

    A hydrocarbon containing only single bonds between carbon atoms.

    Alkane carbon bond number

    Each carbon atom forms four single bonds in an alkane.

    Ethane formula

    CH3CH3

    General alkane formula

    CnH2n+2

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    Alkane bond type

    Alkanes have only single bonds.

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    Pentane displayed formula

    CH3CH2CH2CH2CH3

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    Butane displayed formula

    CH3CH2CH2CH3

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    Propane displayed formula

    CH3CH2CH3

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    Butane carbon number

    4

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    Pentane structural formula

    CH3CH2CH2CH2CH3

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    Ethane molecular formula

    C2H6

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    Alkane Carbon Bonds

    Four

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    Alkane saturation bonding

    Single Bonds

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    Alkane general formula carbons

    CnH2n+2 for "n" carbons

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    Saturated hydrocarbon reason

    Each carbon has its maximum number of single bonds

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