AQA Chemistry 2 specification

here's the full specification for the AQA Chemistry2 GCSE course

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  • Created on: 20-05-12 14:00
Preview of AQA Chemistry 2 specification

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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 to include atomic structure and bonding. The
arrangement of electrons in atoms can be used to explain what happens when elements react
and how atoms join together to form different types of substances.
Candidates should use their skills, knowledge and understanding to:
· write formulae for ionic compounds from given
symbols and ionic charges
· represent the electronic structure of the ions in
sodium chloride, magnesium oxide and calcium
chloride in the following form:
for sodium ion (Na+)
· represent the covalent bonds in molecules such as
water, ammonia, hydrogen, hydrogen chloride
methane and oxygen, and in giant structures such as
diamond and silicon dioxide in the following forms:
· represent the bonding in metals in the following HT only
form:

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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) of atoms in order to
achieve the electronic structure of a noble
gas.
c) When atoms form chemical bonds by Candidates should be able to relate the
transferring electrons, they form ions.…read more

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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 reactions of bromine, chlorine and iodine with iron wool
· growing metal crystals by displacement reactions using metals and salts
· modelling metal structures using polyspheres and bubble rafts.
C2.…read more

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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 charged ions. These compounds
have high melting points and high boiling
points because of the large amounts of energy
needed to break the many strong bonds.…read more

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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 in metals are able to slide
over each other and so metals can be bent
and shaped.
c) Alloys are usually made from two or more
different metals.…read more

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GCSE Chemistry - version 2.…read more

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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 with
the 12C isotope. It is an average value for the
isotopes of the element.…read more

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GCSE Chemistry - version 2.…read more

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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 yield.
f) In some chemical reactions, the products of the
reaction can react to produce the original reactants.…read more

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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
the rate of the reaction this unit is not expected, but
candidates will be expected to have
studied examples of chemical
reactions and processes in developing
their skills during their study of this
section.…read more

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