Alkanes (Edexcel IGCSE Chemistry)

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  • What does saturated mean?

    Saturated means the compounds only have single carbon-carbon bonds, with no double bonds.

  • What is the general formula of an alkane?

    The general formula of an alkane is CnH2n+2.

  • True or False?

    Alkanes are reactive compounds.

    False.

    Alkanes are generally unreactive compounds.

  • What is the name and molecular formula of the alkane containing one carbon atom?

    The name and molecular formula of the alkane containing one carbon atom is methane and CH4.

  • What is the name and molecular formula of the alkane containing two carbon atoms?

    The name and molecular formula of the alkane containing two carbon atom is ethane and C2H6.

  • What is the name and molecular formula of the alkane containing three carbon atoms.

    The name and molecular formula of the alkane containing three carbon atom is propane and C3H8.

  • What is the name and molecular formula of the fourth alkane?

    The fourth alkane is butane, with the molecular formula C4H10.

  • What is the name and molecular formula of the fifth alkane?

    The fifth alkane is pentane, with the molecular formula C5H12.

  • Name the alkane that is predominantly present in natural gas.

    The alkane that is predominantly present in natural gas is methane.

  • What type of reaction occurs between alkanes and halogens?

    Alkanes undergo a substitution reaction with halogens in the presence of ultraviolet radiation.

  • State the equation for methane reacting with bromine in the presence of UV light.

    The equation for methane reacting with bromine in the presence of UV light is:

    CH4 + Br2 → CH3Br + HBr

  • State the equation for methane reacting with chlorine in the presence of UV light.

    The equation for methane reacting with chlorine in the presence of UV light is:

    CH4 + Cl2 → CH3Cl + HCl

  • What are CFCs?

    CFCs are chlorofluorocarbons, an important class of halogenoalkanes.

  • True or False?

    CFCs were previously used in fridges and air conditioners.

    True.

    CFCs were previously used in fridges and air conditioners.

  • What condition is required for alkanes to react with halogens?

    The condition required for the reaction between alkanes and halogens is ultraviolet radiation / UV light.