Alkanes Quiz - Hydrocarbons Basics
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Questions and Answers

Which of the following is the correct general formula for alkanes?

  • CnHn+2
  • CnH2n-2
  • CnH2n+2 (correct)
  • CnH2n
  • Alkanes are considered unsaturated hydrocarbons because they contain only single carbon-carbon covalent bonds.

    False

    What is the name of the alkane with 3 carbon atoms?

    propane

    Each member of an alkane homologous series differs from the next by a ____ unit.

    <p>-CH2-</p> Signup and view all the answers

    Match the alkane with its molecular formula:

    <p>Methane = CH4 Ethane = C2H6 Propane = C3H8 Butane = C4H10</p> Signup and view all the answers

    What is the molecular formula for both hydrocarbons A and B?

    <p>C4H10</p> Signup and view all the answers

    Hydrocarbons A and B have the same structural formula.

    <p>False</p> Signup and view all the answers

    What type of isomers are butane and methylpropane?

    <p>chain isomers</p> Signup and view all the answers

    Hydrocarbon A is called ______, and B is called methylpropane.

    <p>butane</p> Signup and view all the answers

    Match the hydrocarbon with its name:

    <p>Hydrocarbon A = Butane Hydrocarbon B = Methylpropane</p> Signup and view all the answers

    Which of the following statements about the melting and boiling points of alkanes is true?

    <p>Melting and boiling points increase as molecular size increases.</p> Signup and view all the answers

    Branched alkanes with an equal number of carbon atoms will always have a higher melting point than their non-branched isomers

    <p>False</p> Signup and view all the answers

    What causes the sooty flame observed when larger alkanes undergo combustion?

    <p>incomplete combustion</p> Signup and view all the answers

    As the molecular size of alkanes increases, their ______ also increases.

    <p>density</p> Signup and view all the answers

    Match the following alkane properties with their trends as molecular size increases:

    <p>Melting Point = Increases Flammability = Decreases Viscosity = Increases Boiling Point = Increases</p> Signup and view all the answers

    What type of bonds do alkanes primarily have?

    <p>Single carbon-carbon and carbon-hydrogen bonds</p> Signup and view all the answers

    Alkanes are highly reactive due to their weak bonds.

    <p>False</p> Signup and view all the answers

    What is the name of the reaction when methane reacts with chlorine in the presence of UV light?

    <p>substitution reaction</p> Signup and view all the answers

    In the reaction of methane with chlorine, a hydrogen atom in methane is replaced by a ______ atom.

    <p>chlorine</p> Signup and view all the answers

    Match the reactants with their products in the reaction of methane with chlorine under UV light.

    <p>Methane = Chloromethane Chlorine = Hydrogen chloride</p> Signup and view all the answers

    What is the role of UV light in the free-radical substitution of butane with chlorine?

    <p>It initiates the reaction by forming chlorine free radicals.</p> Signup and view all the answers

    In the free-radical substitution of butane with chlorine, a chain reaction is formed by the termination steps.

    <p>False</p> Signup and view all the answers

    What is the definition of a free radical?

    <p>A free radical is an atom or molecule containing one or more unpaired electrons in its valency shell or outer orbit.</p> Signup and view all the answers

    In the free-radical substitution of butane with chlorine, collisions between radicals occur much less than between radicals and molecules when there is an abundance of ______.

    <p>non-radical species</p> Signup and view all the answers

    Match the steps of the free-radical substitution reaction with their descriptions:

    <p>Initiation = Formation of free radicals. Propagation = Chain reaction steps that maintain the reaction. Termination = Steps that result in the removal of free radicals.</p> Signup and view all the answers

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