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Molecules: Shapes & Forces (AQA A Level Chemistry): Exam Questions

Exam code: 7405

3 hours45 questions

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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°

Choose your answer

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

    Choose your answer

    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°

    Choose your answer

    41 mark

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

    • trigonal bipyramidal

    • square planar

    • tetrahedral

    • square planar

    Choose your answer

    51 mark

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

    • CH3CH2Cl

    • CH2CH2

    • CH3CH2OH

    • CH3COOH

    Choose your answer

    61 mark

    Which of the following has the highest boiling point?

    • CH3CH2CH3

    • CH3CH2CH2CH3

    • CH3CH2CH2CH2CH3

    • CH3CH2CH2CH2CH2CH3

    Choose your answer

    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

    Choose your answer

    81 mark

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

    • 0

    • 1

    • 2

    • 3

    Choose your answer

    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°

      Choose your answer

      101 mark

      Which of the following compounds is polar?

      • CCl4

      • BF3

      • PH3

      • CH3CH3

      Choose your answer

      11 mark

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

      • PF6−

      • SF5−

      • BF2−

      • ClF2−

      Choose your answer

      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)

      Choose your answer

      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

      Choose your answer

      41 mark

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

      • 1

      • 2

      • 3

      • 0

      Choose your answer

      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°

      Choose your answer

      61 mark

      Which molecule is nonpolar?

      • CH3CHICH3

      • BF3

      • BrF5

      • CH3CHO

      Choose your answer

      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

      Choose your answer

      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

      Choose your answer

      91 mark

      Which row in the table is correct? 

       

      Molecule

      Nonpolar

      Polar

      A

      Methanol

      ✓

      ⨯

      B

      1-bromopropane

      ✓

      ⨯

      C

      Oxygen

      ⨯

      ✓

      D

      Hydrogen cyanide

      ⨯

      ✓

        Choose your answer

        101 mark

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

        • H3O+

        • TlBr32-

        • BCl3

        • NH3

        Choose your answer

        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

          Choose your answer

          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°

            Choose your answer

            31 mark

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

            • Propanal

            • Propanone

            • Propylamine

            • 2-fluoropropane

            Choose your answer

            41 mark

            Which molecule can butanal can form hydrogen bonds with?

            • CH3CH2COOCH2CH3

            • CH3CH2CH2OH

            • CH3CH2COCH3

            • CH3CH2CHO

            Choose your answer

            51 mark

            What is the correct shape of a ClF2- ion?

            • Linear

            • T-Shaped

            • Bent

            • Trigonal planar

            Choose your answer

            61 mark

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

            • SF4

            • PF5

            • Cl F3

            • IF5

            Choose your answer

            71 mark

            Which row in the table is not correct?

             

            Molecule

            Nonpolar

            Polar

            A

            SO2

            ⨯

            ✓

            B

            H2S

            ⨯

            ✓

            C

            SF6

            ✓

            ⨯

            D

            SF2

            ✓

            ⨯

              Choose your answer

              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

              Choose your answer

              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

                Choose your answer

                101 mark

                Which compound has the highest boiling point?

                • CH3CH2OH

                • CH3CH2NH2

                • CH3CHO

                • CH3CH2Cl

                Choose your answer