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3.4 Unit 2 Chemistry 2

Throughout this unit candidates will be expected to write word equations for
reactions specified. Higher tier candidates will also be expected to write and
balance symbol equations for reactions specified throughout the unit.
C2.1 Structure and bonding
Simple particle theory is developed in this unit…

Page 2

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GCSE Chemistry - version 2.0 ­ For first certification June 2013




Subject content Additional guidance
C2.1.1 Structure and bonding
a) Compounds are substances in which atoms of
two or more elements are chemically
combined.
b) Chemical bonding involves either transferring
or sharing electrons in the highest occupied
energy levels (shells)…

Page 3

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GCSE Chemistry - version 2.0 ­ For first certification June 2013



Suggested ideas for practical work to develop skills and understanding include the following:
· molecular modelling
· modelling electron transfer and electron sharing using computer simulations
· Group 1 and Group 7 reactions, eg sodium with chlorine
· the…

Page 4

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GCSE Chemistry - version 2.0 ­ For first certification June 2013




C2.2.2 Ionic compounds
a) Ionic compounds have regular structures Knowledge of the structures of specific
(giant ionic lattices) in which there are strong ionic compounds other than sodium
electrostatic forces in all directions between chloride is not required.
oppositely…

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GCSE Chemistry - version 2.0 ­ For first certification June 2013




C2.2.4 Metals
a) Metals conduct heat and electricity HT only
because of the delocalised electrons in Candidates should know that
their structures. conduction depends on the ability of
electrons to move throughout the
metal.
b) The layers of atoms…

Page 6

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GCSE Chemistry - version 2.0 ­ For first certification June 2013




Suggested ideas for practical work to develop skills and understanding include the following:
· demonstration of heating sulfur and pouring it into cold water to produce plastic sulfur
· investigating the properties of ionic compounds, eg NaCl:
- melting…

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GCSE Chemistry - version 2.0 ­ For first certification June 2013



d) Atoms of the same element can have different
numbers of neutrons; these atoms are called
isotopes of that element.
e) The relative atomic mass of an element (Ar) HT only
compares the mass of atoms of the element…

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GCSE Chemistry - version 2.0 ­ For first certification June 2013



c) Gas chromatography linked to mass spectroscopy Candidates need only a basic
(GC-MS) is an example of an instrumental method: understanding of how GC-MS
· gas chromatography allows the separation of a works, limited to:
mixture of compounds ·…

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GCSE Chemistry - version 2.0 ­ For first certification June 2013



e) The amount of a product obtained is known as the Higher tier candidates will be
yield. When compared with the maximum expected to calculate
theoretical amount as a percentage, it is called the percentage yields of reactions.
percentage…

Page 10

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GCSE Chemistry - version 2.0 ­ For first certification June 2013




Candidates should use their skills, knowledge and understanding to:
· interpret graphs showing the amount of product Knowledge of specific reactions other
formed (or reactant used up) with time, in terms of than those in the subject content for…

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