EDEXCEL GCSE Additional Science GCSE
Chemistry Unit C2 Discovering chemistry
Chemistry Unit C2 Topic 2 Ionic compounds and analysis
2.1 Be able to demonstrate an understanding that atoms of different elements can combine
to form compounds by the formation of new chemical bonds.
2.2 Be able to describe how ionic
bonds are formed by the transfer of electrons to produce cations and anions.
Be able to describe an ion as an atom or group of atoms with a positive or negative charge.
2.4 Be able to describe the formation of sodium ions, Na+, and chloride ions, Cl-, and
hence the formation of ions in other ionic compounds from their atoms, limited
to compounds of elements in groups 1, 2, 6 and 7.
2.5 Be able to demonstrate an
understanding of the use of the endings –ide and –ate in the names of compounds.
2.6 Deduce the formulae of ionic compounds (including oxides, hydroxides,
halides, nitrates, carbonates and sulfates) given the formulae of the
2.7 HT only: Be able to describe the structure of ionic compounds as a lattice
a) consisting of a regular arrangement of ions
b) held together by
strong electrostatic forces (ionic bonds) between oppositely-charged ions
2.8 Be able to describe and (HT only:
) explain the properties of
ionic substances including sodium chloride and magnesium oxide, limited to:
melting points and boiling points
b) whether they conduct electricity as solids,
when molten and in aqueous solution
2.9 Know the general rules which describe the solubility of common types of
substances in water:
a) all common sodium, potassium and ammonium salts are
b) all nitrates are soluble
c) common chlorides are soluble except those
of silver and lead
d) common sulfates are soluble except those of lead, barium
e) common carbonates and hydroxides are insoluble except those of
sodium, potassium and ammonium
2.10 Be able to demonstrate an understanding that insoluble salts can be formed as
precipitates by the reaction of suitable reagents in solution.
2.11 Be able to demonstrate
an understanding of the method needed to prepare a pure, dry sample of an
2.12 Revise the preparation of an insoluble salt by precipitation.
2.13 Be able to use solubility rules to predict whether a precipitate is formed when named solutions
are mixed together and to name the precipitate
2.14 Know that the insoluble
salt, barium sulfate, is given as a ‘barium meal’ to X-ray patients because:
it is opaque to X-rays
b) it is safe to use as, although barium salts are toxic,
its insolubility prevents it entering the blood
2.15 Be able to describe tests to show the following ions are present in solids or
a) Na+, K+, Ca2+, Cu2+ using flame tests
b) CO32- using dilute acid and
identifying the carbon dioxide evolved
c) SO42- using dilute hydrochloric acid
and barium chloride solution
d) Cl- using dilute nitric acid and silver nitrate
2.16 Know that chemists use spectroscopy (a type of flame test) to detect
the presence of very small amounts of elements and that this led to the
discovery of new elements, including rubidium and caesium.
Revision Notes and Quizzes to
help you revise
Edexcel GCSE Additional
When revising, these pages
provide you with a summary of what you need to know and be able to do.
BUT remember, your primary
source of revision are your class notes, investigations and Edexcel GCSE