IB Chemistry SL 1.2 The Nuclear Atom Question Bank
Practise IB Chemistry SL 1.2 with evidence-led questions on atomic structure, isotopes, mass spectra and nuclear evidence.
- Syllabus
- First assessment 2025
- Course
- Chemistry SL
- Level
- SL
Covered syllabus points
Structure 2. Models of bonding and structure question 1
[Maximum number: 1]
How many electrons will be gained or lost when the element with electron configuration 1s22s22p3 forms an ionic bond?
A
Two electrons lost
B
Two electrons gained
C
Three electrons lost
D
Three electrons gained
D
Structure 2. Models of bonding and structure question 2
[Maximum number: 6]
Ethyne, C2H2, reacts with oxygen in welding torches.
Question (a)
(a)
Deduce the Lewis (electron dot) structure of ethyne.
[ 1 ]
H:C::C:H/H−C≡C−H
Marking guidance:
Accept any valid combination of lines, dots and crosses.
Question (b)
(b)
Compare, giving a reason, the length of the bond between the carbon atoms in ethyne with that in ethane, C2H6.
[ 1 ]
«ethyne» shorter AND a greater number of shared/bonding electrons OR
«ethyne» shorter AND stronger bond
Question (c)
(c)
Identify the type of interaction that must be overcome when liquid ethyne vaporizes.
[ 1 ]
London/dispersion/instantaneous dipole-induced dipole forces
Marking guidance:
Do not accept just "intermolecular forces" or "van der Waals' forces".
Question (d)
(d)
Product B,CH3CHO, can also be synthesized from ethanol.
[ 3 ]
Question (i)
(i)
Explain why product B is water soluble.
[ 3 ]
Any three of: has an oxygen/O atom with a lone pair that can form hydrogen bonds/H-bonds «with water molecules» hydrocarbon chain is short «so does not disrupt many H-bonds with water molecules》
«large permanent» dipole-dipole interactions with water
3 max
Structure 2. Models of bonding and structure question 3
[Maximum number: 6]
Iron may be extracted from iron (II) sulfide, FeS.
Question (a)
(a)
Outline why metals, like iron, can conduct electricity.
[ 1 ]
mobile/delocalized <<sea of >> electrons
Question (b)
(b)
Iron (II) sulfide, FeS , is ionically bonded.
[ 3 ]
Question (i)
(i)
Describe the bonding in this type of solid.
[ 2 ]
electrostatic attraction between oppositely charged ions/between Fe2+ and S2−
Question (ii)
(ii)
Suggest why chemists find it convenient to classify bonding into ionic, covalent and metallic.
[ 1 ]
allows them to explain the properties of different compounds/substances OR enables them to generalise about substances
OR enables them to make predictions
Marking guidance:
Accept other valid answers.
Question (c)
(c)
Explain why the addition of small amounts of carbon to iron makes the metal harder.
[ 2 ]
disrupts the regular arrangement «of iron atoms/ions»
OR
carbon different size «to iron atoms/ions»
prevents layers/atoms sliding over each other
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