11 mark
What is the correct bond angle in a trigonal planar molecule?
107°
120°
180°
109.5°
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Molecules: Shapes & Forces (AQA A Level Chemistry)
Exam Questions
3 hours45 questions21 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?
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?
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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