lOMoAR cPSD| 56342273
Mark Scheme
, lOMoAR cPSD| 56342273
Question 1
Question Answers Extra information Mark
01.1 gas 1
01.2 reactivity decreases as you go Allow converse argument 1
down the group throughout.
the outer electrons are farther Allow more energy levels/ shells. 1
from the nucleus
Allow more shielding.
less attraction between the outer 1
electrons and the nucleus
(so) the electron is gained less
easily 1
01.3 potassium chloride bromine Answers in either order.
1
1
01.4 displacement (reaction) 1
01.5 no reaction 1
because iodine is less reactive than 1
bromine
Allow converse.
Total 10
Question 2
Question Answers Extra information Mark
02.1 Level 3: There is a clear description of the difference between the two 5-6
atomic models which is linked to an explanation of the evidence that
caused the change in model.
Level 2: There is a description of both atomic models or there is a 3-4
description of one model and a description of the evidence from the
alpha particle experiment.
, lOMoAR cPSD| 56342273
Level 1: There are simple statements that describe a model or the 1-2
evidence from the alpha particle scattering experiment.
Two marks can be given for two valid statements.
No relevant content. 0
Indicative content:
Plum Pudding Model
• a ball of positive charge
• negative electrons embedded in it
Evidence
• alpha particle scattering experiment
• some of the alpha particles were reflected
• (which suggested the) mass of the atom is concentrated at the
centre
• some of the alpha particles were reflected
• (which suggested) the centre was charged
Nuclear Model
• positively charged nucleus
• negatively charged electrons orbiting the outside
02.2 6 1
02.3 similarity: (same) number of If numbers are quoted, they must 1
protons or (same) number of be correct.
electrons
1
difference: (different) numbers of
neutrons
Mark Scheme
, lOMoAR cPSD| 56342273
Question 1
Question Answers Extra information Mark
01.1 gas 1
01.2 reactivity decreases as you go Allow converse argument 1
down the group throughout.
the outer electrons are farther Allow more energy levels/ shells. 1
from the nucleus
Allow more shielding.
less attraction between the outer 1
electrons and the nucleus
(so) the electron is gained less
easily 1
01.3 potassium chloride bromine Answers in either order.
1
1
01.4 displacement (reaction) 1
01.5 no reaction 1
because iodine is less reactive than 1
bromine
Allow converse.
Total 10
Question 2
Question Answers Extra information Mark
02.1 Level 3: There is a clear description of the difference between the two 5-6
atomic models which is linked to an explanation of the evidence that
caused the change in model.
Level 2: There is a description of both atomic models or there is a 3-4
description of one model and a description of the evidence from the
alpha particle experiment.
, lOMoAR cPSD| 56342273
Level 1: There are simple statements that describe a model or the 1-2
evidence from the alpha particle scattering experiment.
Two marks can be given for two valid statements.
No relevant content. 0
Indicative content:
Plum Pudding Model
• a ball of positive charge
• negative electrons embedded in it
Evidence
• alpha particle scattering experiment
• some of the alpha particles were reflected
• (which suggested the) mass of the atom is concentrated at the
centre
• some of the alpha particles were reflected
• (which suggested) the centre was charged
Nuclear Model
• positively charged nucleus
• negatively charged electrons orbiting the outside
02.2 6 1
02.3 similarity: (same) number of If numbers are quoted, they must 1
protons or (same) number of be correct.
electrons
1
difference: (different) numbers of
neutrons
