Mini-Mock Unit 3 Aqa Gcse Chemistry Higher Tier Worksheet
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18MINI-MOCK
UNIT 3 AQA GCSE CHEMISTRY HIGHER TIER
Q1.
(a)
The table gives the melting points of some of the elements of Group 7.
Element
Atomic number
Melting point in ºC
Fluorine
9
–220
Chlorine
17
–101
Bromine
35
–7
Iodine
53
114
Astatine
85
?
(i)
Plot a graph of the melting point against atomic number.
Draw a line of best fit. Extend
your line to estimate a value for the melting
point of astatine.
(2)
(ii)
Estimate the melting
point of astatine.
........................................................ °C
(1)
(iii)
Which of the Group 7
elements are solids at 20 °C?
(1)
(b)
(i)
Draw a diagram to show the
arrangement of electrons in an atom of fluorine [1)
(ii)
The elements of Group
7 have similar chemical properties. Explain,
in terms of electrons, why they have similar
chemical properties (1)
(c)
Xenon is a very unreactive element.
(i)
Explain, in terms of electrons, why xenon is so unreactive. (2)
(ii)
Fluorine reacts with xenon but iodine does not. Explain, in terms of atomic structure, why fluorine is
more reactive than iodine.
(3)(Total 11 marks)
Q2.
(a)
State one similarity and one difference in the electronic structure of the elements:
(i)
across the Period from sodium to argon
(2)
(ii)
down Group 7 from fluorine to astatine.
(2)
Page 1
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