Which molecule is not planar?
C2H4
C2H6
H2CO
HCN
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Which molecule is not planar?
C2H4
C2H6
H2CO
HCN
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Which element has induced dipole–dipole interactions (London forces) in its solid lattice?
Boron
Magnesium
Silicon
Sulfur
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What is the shape around the carbon atoms in graphene?
Linear
Pyramidal
Tetrahedral
Trigonal planar
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A ‘dot-and-cross’ diagram for nitrogen trichloride, NCl3, is shown below.
Which row shows the correct shape and bond angle in a molecule of NCl3?
Name of shape | Bond angle | |
A | Pyramidal | 104.5 ° |
B | Pyramidal | 107 ° |
C | Tetrahedral | 107 ° |
D | Trigonal planar | 120 ° |
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Which molecule is non-polar?
SF6
H2O
PF3
NH3
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Which substance contains hydrogen bonding in the liquid state?
CH3(CH2)4CH3
CH3(CH2)3CHFCH3
CH3(CH2)3COCH3
CH3(CH2)3CH(OH)CH3
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The boiling point of hydrogen bromide is –67 °C.
The boiling point of hydrogen iodide is –34 °C.
The different boiling points can be explained in terms of the strength of bonds or interactions.
Which bonds or interactions are responsible for the higher boiling point of hydrogen iodide?
Covalent bonds
Hydrogen bonds
Permanent dipole–dipole interactions
Induced dipole–dipole interactions
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What is the correct bond angle in a trigonal planar molecule?
107°
120°
180°
109.5°
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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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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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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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Which molecule is nonpolar?
CH3CHICH3
BF3
BrF5
CH3CHO
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Which one of these species has a bond angle of 120°?
H3O+
TlBr32-
BCl3
NH3
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What is the strongest type of intermolecular force exhibited in the amino acid molecule serine?
Serine
London dispersion forces
Permanent dipole-dipole forces
Hydrogen bonding
Covalent bonding
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Which organic compound has the highest boiling point?
Butan-1-ol
Butane
1-chlorobutane
Propane
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Which molecule has the lowest boiling point?
CH3CH2CHO
CH3CH2CH2Cl
CH3CH2CH3
CH3CH2COOH
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Which statement explains why water is more dense than ice?
Ice contains hydrogen bonds, but water does not contain hydrogen bonds
Hydrogen bonds are stronger in water than in ice
Hydrogen bonds hold H2O molecules closer together in water
Ice is a solid and water is a liquid
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Which statement explains why hexane has a higher boiling point than 2,2-dimethylbutane?
Hexane has a higher Mr than 2,2-dimethylbutane
2,2-dimethylbutane has a lower boiling point as it is a branched molecule
2,2-dimethylbutane only contains London dispersion forces
Hexane contains permanent dipole dipole forces
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Which element has induced dipole dipole interactions (London dispersion forces) in its solid lattice?
Sodium
Diamond
Phosphorus
Beryllium
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Four atoms, 1–4, are labelled in the structure below.
Which atom has a trigonal planar arrangement of bonds around it?
Atom 1
Atom 2
Atom 3
Atom 4
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Which compound has polar molecules?
OCl2
BCl3
BCl4
SCl6
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The boiling point of butan-1-ol is 118 °C. The boiling point of 2-methylpropan-2-ol is 82 °C.
Why is the boiling point of butan-1-ol higher than that of 2-methylpropan-2-ol?
Butan-1-ol has stronger induced dipole–dipole interactions because it has more electrons
Butan-1-ol has stronger induced dipole–dipole interactions because it has a straight-chain structure
Butan-1-ol can form hydrogen bonds while 2-methylpropan-2-ol cannot
Butan-1-ol is more stable because it is a primary alcohol
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Which compound has non-polar molecules?
E-1,2-dichlorobut-2-ene
E-2,3-dichlorobut-2-ene
Z-2,3-dichlorobut-2-ene
Z-1,4-dichlorobut-2-ene
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Four atoms, 1-4, are labelled in the structure below
Which atom has a v-shaped arrangement of bonds around it?
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Which row has the correct shape, bond angle and explanation for the following molecules?
|
Molecule |
Shape |
Bond angle |
Explanation |
A |
Ethanoic acid |
Pyramidal around the carbonyl carbon |
107o |
The carbon atom is sp2 hybridised so the double bond repels more than the single bonds |
B |
[Cu(NH3)4(H2O)2]2+ |
Octahedral |
90o |
The eight bonding pairs will repel each other equally |
C |
Cisplatin |
Square planar |
109.5o |
Minimises the repulsion between the electrons in the d orbitals |
D |
Sulfur dioxide |
Bent |
119o |
Lone pairs repel more than bonding pairs due to a higher concentration of the electron charge cloud |
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Which of the following statements is/are correct?
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
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This question is about butane, propanone and the amino acid glycine (R group -H).
Which of the following statements is/are correct?
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
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