Multiple Choice Questions (MCQ) topic quiz
2.2 Electrons, bonding and structure
Instructions and answers for teachers
These instructions cover the learner activity section which can be found on page 6. This
Lesson Element supports OCR AS and A Level Chemistry A.
When distributing the activity section to the learners either as a printed copy or as a
Word file you will need to remove the teacher instructions section.
The Activity
This Lesson Element is a teaching and learning resource containing 10 multiple choice
questions (MCQs) on the theme of electrons, bonding and structure. Some questions might
require synoptic thinking, using knowledge and ideas from various topics across the full A
Level content.
This resource can be used to test and consolidate understanding at the end of a topic or to
revisit and refresh knowledge at a later point in the course.
Learning Outcomes
This lesson element relates to the specification learning outcomes 2.2.2(c), 2.2.2(e),
2.2.2(g), 2.2.2(i), 2.2.2(j), 2.2.2(k), 2.2.2(l), 2.2.2(m), 2.2.2(n), 3.2.1(f).
Introduction
Multiple choice questions allow rapid coverage of a wide range of sub-topics.
Contrary to a widespread belief among students, multiple choice questions are not
necessarily easy – they can be easy, moderate or difficult.
The questions are written so that the incorrect answers are plausible distractors based on
common errors or misconceptions.
The questions in this quiz cover topics mainly from specification sections:
2.2 Electrons, bonding and structure.
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Multiple Choice Questions (MCQ) topic quiz - answers
1.
Which of the below is described by: high melting point, can conduct, soluble in water.
A
Al(s)
Can conduct but is insoluble.
B
carbon (graphite)
Identified it has a high mp and can conduct, it
is not soluble.
C
CH4(g)
Is incorrect on all properties.
D
NaCl (aq)
Correct answer, can conduct as it is aqueous.
Your answer
2.
Which is the correctly drawn ammonium ion?
A
This is ammonia rather than the ion.
B
Correct answer. The top hydrogen is attached
with a dative bond, the ion has a + charge.
C
The ion has the wrong charge and has too
few electrons from the nitrogen.
D
This is ammonia but drawn without the
correct number of electrons on the nitrogen.
Your answer
Version 1
D
2
B
© OCR 2016
3.
If the total bond enthalpy for methane is 1652 kJ mol–1 and ethane is 2826 kJ mol–1, what
is the strength of a C–C bond?
A
1.71 kJ mol–1
They have tried dividing the numbers.
B
348 kJ mol–1
Correct, 1652 / 4 = 413 C–H 2826 – (413 × 6)
= 348 C–C
C
1174 kJ mol–1
Incorrect, they have subtracted one number
from the other.
D
4478 kJ mol–1
Incorrect, they have simply added the
numbers in the question.
Your answer
4.
What is the bond angle of a H3O+ ion?
A
104.5°
Incorrect, this is the angle for H2O with two
lone pairs.
B
107°
Correct answer. The hydronium ion has three
bonded pairs and one lone pair.
C
109.5°
Incorrect, this would need four bonded pairs.
D
120°
Incorrect, they have not accounted for the
lone pair.
Your answer
5.
B
Which would have the strongest permanent dipoles?
Incorrect. They may be looking at the pair of
elements that have the strongest
electronegativity overall.
A
ClF
B
CO
C
HF
Correct answer. This pair of elements has the
biggest difference in electronegativity.
D
HI
Incorrect. They may have misremembered
the trend in electronegativity down a group.
Incorrect. They may be focusing on the
electronegativity of oxygen, or confused with
the electron density associated with double
bonds.
Your answer
Version 1
B
3
C
© OCR 2016
6.
Which would have a permanent dipole?
A
H2O
Correct answer, it is non-symmetrical,
causing a dipole.
B
CO2
Incorrect, it is a symmetrical molecule.
C
NH4+
Incorrect, they may have confused charge
with dipoles.
D
CH4
Incorrect, it is a symmetrical molecule.
Your answer
7.
A
Which molecules have the strongest intermolecular forces?
A
BF3
Incorrect, it only has induced dipole–dipole
interactions.
B
H2S
Incorrect, unlike water it has no hydrogen
bonds.
C
NH3
Correct answer. This has hydrogen bonding.
D
H2
Incorrect, may think that hydrogen always
has hydrogen bonds.
Your answer
8.
Which statement(s) is/are true?
1)
Water has hydrogen bonds which increase the boiling point.
2)
Water as a solid is more dense than as a liquid.
3)
Water has bond angles of 180o.
A
1, 2 and 3
Incorrect.
B
only 1 and 2
Incorrect.
C
only 2 and 3
Incorrect.
D
only 1
Correct answer, water is less dense as a
solid and has bond angles of 104.5o.
Your answer
Version 1
C
4
D
© OCR 2016
9.
Which structure would sulfur(s), S8, have?
A
simple covalent molecules
Incorrect, the simple molecules form a lattice.
B
simple covalent lattice
Correct answer. When solid, simple
molecules form a lattice structure.
C
giant covalent lattice
Incorrect, a network of covalent bonds is not
formed between all atoms.
D
giant ionic lattice
Incorrect, they have identified the wrong type
of bonding.
Your answer
10.
B
Which general trend on the periodic table shows a decrease in electronegativity?
A
right to left, bottom to top
Incorrect, Li does not have the highest
electronegativity.
B
right to left, top to bottom
Correct answer. Fr should have the lowest
electronegativity and F the highest.
C
left to right, top to bottom
Incorrect.
D
left to right, bottom to top
Incorrect, may have misread ‘decrease’ in the
question.
Your answer
B
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Multiple Choice Questions (MCQ) topic quiz
2.2 Electrons, bonding and structure
Learner Activity
1.
Which of the below is described by: high melting point, can conduct, soluble in water.
A
Al(s)
B
carbon (graphite)
C
CH4(g)
D
NaCl (aq)
Your answer
2.
Which is the correctly drawn ammonium ion?
A
B
D
C
Your answer
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6
© OCR 2016
3.
If the total bond enthalpy for methane is 1652 kJ mol–1 and ethane is 2826 kJ mol–1, what
is the strength of a C–C bond?
A
1.71 kJ mol–1
B
348 kJ mol–1
C
1174 kJ mol–1
D
4478 kJ mol–1
Your answer
4.
What is the bond angle of a H3O+ ion?
A
104.5°
B
107°
C
109.5°
D
120°
Your answer
5.
Which would have the strongest permanent dipoles?
A
ClF
B
CO
C
HF
D
HI
Your answer
6.
Which would have a permanent dipole?
A
H2O
B
CO2
C
NH4+
D
CH4
Your answer
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© OCR 2016
7.
Which molecules have the strongest intermolecular forces?
A
BF3
B
H2S
C
NH3
D
H2
Your answer
8.
Which statement(s) is/are true?
1)
Water has hydrogen bonds which increase the boiling point.
2)
Water as a solid is more dense than as a liquid.
3)
Water has bond angles of 180o.
A
1, 2 and 3
B
only 1 and 2
C
only 2 and 3
D
only 1
Your answer
9.
Which structure would sulfur(s), S8, have?
A
simple covalent molecules
B
simple covalent lattice
C
giant covalent lattice
D
giant ionic lattice
Your answer
10.
Which general trend on the periodic table shows a decrease in electronegativity?
A
right to left, bottom to top
B
right to left, top to bottom
C
left to right, top to bottom
D
left to right, bottom to top
Your answer
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© OCR 2016