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Molecules: Shapes & Forces (AQA A Level Chemistry)

Exam Questions

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Molecules: Shapes & Forces

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Molecules: Shapes & Forces

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11 mark

What is the correct bond angle in a trigonal planar molecule?

  • 107°

  • 120°

  • 180°

  • 109.5°

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21 mark

Which statement is correct for a molecule of CCl4

 

Total number of valence electrons

Number of bonding pairs 

Number of lone pairs

A

30

4

2

B

32

4

0

C

34

4

1

D

16

4

0

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    31 mark

    Hydrazine, N2H4, is a precursor for multiple pharmaceutical compounds.

    What is the bond angle for a molecule of hydrazine?

    1

    • 107°

    • 120°

    • 180°

    • 109.5°

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    41 mark

    What is the correct shape of a borohydride, BH4-, molecule?

    • trigonal bipyramidal

    • square planar

    • tetrahedral

    • square planar

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    51 mark

    Which of the following compounds does not contain a polar bond?

    • CH3CH2Cl

    • CH2CH2

    • CH3CH2OH

    • CH3COOH

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    61 mark

    Which of the following has the highest boiling point?

    • CH3CH2CH3

    • CH3CH2CH2CH3

    • CH3CH2CH2CH2CH3

    • CH3CH2CH2CH2CH2CH3

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    71 mark

    Which of the following statements is not correct?

    • The strongest type of intermolecular force in ammonia is hydrogen bonding

    • The strongest type of intermolecular force in water is hydrogen bonding

    • The strongest type of intermolecular force in hydrogen chloride is permanent dipole-dipole

    • The strongest type of intermolecular forces in ethanol is permanent dipole-dipole

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    81 mark

    How many lone pairs are there in a molecule of PCl3?

    • 0

    • 1

    • 2

    • 3

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    91 mark

    Which of the following is correct?

     

    Shape of SF6 molecule

    Bond angle in SF6 molecule

    A

    Octahedral

    90°

    B

    Square planar

    90°

    C

    Trigonal bipyramidal 

    120°

    D

    Tetrahedral 

    109.5°

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      101 mark

      Which of the following compounds is polar?

      • CCl4

      • BF3

      • PH3

      • CH3CH3

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      11 mark

      Three lone pairs of electrons can be found around the central atom of which of the following ions?

      • PF6−

      • SF5−

      • BF2−

      • ClF2−

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      21 mark

      Which of the following changes of state shows only dispersion van der Waals’ forces being overcome?

      • CH3NH2 (l) → CH3NH2 (g)

      • H2O (s) → H2O (l)

      • CO2 (s) → CO2 (g)

      • C2H5OH (l) → C2H5OH (g)

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      31 mark

      The correct order of increasing boiling points for the following compounds is

      • 1-chlorobutane, butane, butan-1-ol

      • butan-1-ol, 1-chlorobutane, butane

      • butane, 1-chlorobutane, butan-1-ol

      • butan-1-ol, butane, 1-chlorobutane

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      41 mark

      How many lone pairs of electrons are there in a chlorine trifluoride, ClF3, molecule?

      • 1

      • 2

      • 3

      • 0

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      51 mark

      What is the correct shape and bond angle of the phosphonium ion, PH4+?

      • Tetrahedral and 109.5°

      • Square planar and 90°

      • V-shaped and 105°

      • Tetrahedral and 107°

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      61 mark

      Which molecule is nonpolar?

      • CH3CHICH3

      • BF3

      • BrF5

      • CH3CHO

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      71 mark

      What is the strongest type of intermolecular force exhibited in the amino acid molecule serine?

      26

      • van der Waals

      • permanent dipole-dipole forces

      • hydrogen bonding

      • covalent bonding

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      81 mark

      Hexane, C6H14 and 2,2-dimethylbutane, CH3C(CH3)2CH2CH3, are two isomers of one another and have the same Mr of 86.0.

      Hexane has a higher boiling point than 2,2-dimethylbutane.

      Which of the following statements is not correct? 

      • hexane has a higher boiling point because it is a straight chain molecule

      • 2,2-dimethylbutane has a lower boiling point as it is a branched molecule

      • 2,2-dimethylbutane only contains van der Waals forces

      • hexane contains permanent dipole dipole forces

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      91 mark

      Which row in the table is correct? 

       

      Molecule

      Nonpolar

      Polar

      A

      Methanol

      ✓

      ⨯

      B

      1-bromopropane

      ✓

      ⨯

      C

      Oxygen

      ⨯

      ✓

      D

      Hydrogen cyanide

      ⨯

      ✓

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        101 mark

        Which one of these species has a bond angle of 120°?

        • H3O+

        • TlBr32-

        • BCl3

        • NH3

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        11 mark

        What is the strongest intermolecular force in BrF5 and CH3Br? 

         

        BrF5

        CH3Br

        A

        Van der Waals’ 

        Van der Waals’ 

        B

        Permanent dipole-dipole

        Permanent dipole-dipole

        C

        Permanent dipole-dipole 

        Van der Waals’

        D

        Van der Waals’

        Permanent dipole-dipole

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          21 mark

          The correct shape and bond angle for the TlBr32- ion?

           

          Shape

          Bond angle

          A

          Pyramidal 

          120°

          B

          Pyramidal

          107°

          C

          Tetrahedral

          109.5°

          D

          Tetrahedral

          120°

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            31 mark

            Which of the following molecules will have the highest boiling point?

            • Propanal

            • Propanone

            • Propylamine

            • 2-fluoropropane

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            41 mark

            Which molecule can butanal can form hydrogen bonds with?

            • CH3CH2COOCH2CH3

            • CH3CH2CH2OH

            • CH3CH2COCH3

            • CH3CH2CHO

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            51 mark

            What is the correct shape of a ClF2- ion?

            • Linear

            • T-Shaped

            • Bent

            • Trigonal planar

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            61 mark

            Which molecule does not have five pairs of electrons around the central atom?

            • SF4

            • PF5

            • Cl F3

            • IF5

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            71 mark

            Which row in the table is not correct?

             

            Molecule

            Nonpolar

            Polar

            A

            SO2

            ⨯

            ✓

            B

            H2S

            ⨯

            ✓

            C

            SF6

            ✓

            ⨯

            D

            SF2

            ✓

            ⨯

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              81 mark

              Which statement about hydrogen bonding is correct?

              • The surface tension in water is increased by the action of hydrogen bonds between the molecules

              • Hydrogen bonds are relatively shorter than the O-H bonds within the molecule

              • The molecules in ice are more densely packed together when water freezes

              • Hydrogen bonds are weaker than permanent dipole dipole forces

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              91 mark

              What is the correct order of boiling points for the following molecules, from lowest to highest?

               

              Lowest -------------------------------------> Highest

              A

              CH3F

              F2

              CH3CH2F

              HF

              B

              F2

              CH3F

              CH3CH2F

              HF

              C

              F2

              CH3CH2F

              CH3F

              HF

              D

              HF

              CH3CH2F

              CH3F

              F2

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                101 mark

                Which compound has the highest boiling point?

                • CH3CH2OH

                • CH3CH2NH2

                • CH3CHO

                • CH3CH2Cl

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