Question Ma
Expected Answer Accept Reject
number rks
1 (a) M1 both protons = 6 1
M2 C-13 has 7 and C-14 has 8 (neutrons) 1
(b) same electronic configuration(s) / structure(s) different number of 1
protons
OR
same number of electrons amount for number / six
OR electrons
have four/same number of electrons in outer /
valence shell
IGNORE same number of electrons in inner shells
IGNORE references to atomic number / same
number of protons / different number of neutrons
(c) (i) M1 the average / mean mass of an atom (of the average/mean of: mean mass of an element 1
element) atomic masses /
mass numbers /
mass of isotopes 1
on a scale where
th
M2 compared to / relative to (1/12 ) the mass carbon-12 has a mass of
(of an atom) of carbon-12 12
/ compared with the
mass of carbon-12
OR which is 12
M1 mass of one mole of atoms
mass of one mole of the
th
M2 compared to (mass of) 1/12 one mole / 1g element
of carbon-12
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Question Mar
Expected Answer Accept Reject
number ks
1 c (ii) M1 (12 x 98.9) + (13 x 1.1) (12 x 0.989) + (13 x 1
0.011) for first 2 marks
M2 100 1
M3 12.01 12.011 on its own for 2 1
marks
IGNORE units
12.01 on its own for 3
marks
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Question
Answer Notes Marks
number
2 (a) electron(s) 1
(b) electron(s) 1
Accept in either order both
(c) (i) protons (and) electrons 1
answers
(ii) protons 1
neutrons 1
(d) (i) 12 1
(ii) 24 1
(iii) 2.8.2 Accept any other punctuation
marks, such as , / ) — and no 1
punctuation marks
Total 8 marks
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Question
Answer Notes Marks
number
3 (a) 3 1
(b) ammonia / NH3 Do not accept ammonium 1
hydrogen chloride / HCl Do not accept hydrochloric 1
acid
Accept in either order.
If name and formula given,
both must be correct.
Ignore state symbols, except
HCl (aq)
(c) ammonium chloride / NH4Cl Do not accept ammonia 1
chloride.
If name and formula given,
both must be correct.
(d) cross in box 2 (decomposition) 1
cross in box 4 (neutralisation) 1
Total 6 marks
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Question
Answer Notes Marks
number
4 a 1
b i A (an electron) 1
ii B (a neutron) 1
iii B (electrons and protons) 1
c isotopes
atomic numbers 3
mass numbers
Total 7 marks
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Question Mark
Answer Accept Reject
number s
5 (a) releases thermal energy releases heat (energy) just releases energy 1
produces an increase in
temperature
(b) 1
D
(c) 1
A
(d) M1 (consists of) positive AND negative/oppositely 4
charged ions/Mg2+ AND O2— (ions)
IGNORE references to loss and gain of electrons
M2 (strong) attraction between (positive AND (strong) ionic bonding/(strong)
negative/ ionic bonds
oppositely charged) ions/Mg2+ AND O2— (ions)
M3 many ions (present in lattice)/giant
structure/giant lattice
M4 large amount of energy required (to separate the break the ionic bonding/bonds
ions/overcome the attraction between the ions)
If mention of covalent bonds/metallic
bonds/intermolecular forces only M4 can be awarded
7 (e) M1 (name) magnesium chloride 1
M2 (formula) MgCl2 accept a correct formula as a
1
product in an equation whether
Penalise inappropriate use of upper or lower case
the equation correct or not
letters or numbers in the wrong place
Total 9
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Question
Answer Notes Marks
number
6 a M1 nucleus 1
M2 protons 1
Accept in either order
M3 neutrons 1
M4 electrons 1
M5 shells 1
M6 protons AND electrons In either order 1
M7 electrons 1
b i 3 1
ii 5 1
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