Checklist for WHOLE AS

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OCR Chemistry A
Atoms, ions, and compounds
Specification Checklist
reference questions
Can you describe isotopes as atoms of the same element with different
2.1.1a
numbers of neutrons and different masses?
Can you describe atomic structure in terms of the numbers of protons,
2.1.1 b neutrons and electrons for atoms and ions, given the atomic number, mass
number and any ionic charge?
Can you explain the terms relative isotopic mass (mass compared with
1/12th mass of carbon12) and r elative atomic mass (weighted mean mass
2.1.1 c
compared with 1/12th mass of carbon12), based on the mass of a 12
C atom,
the standard for atomic masses?
2.1.1 d Can you use mass spectrometry?
Can you use mass spectrometry to determine relative isotopic masses and
2.1.1 d i
relative abundances of the isotope?
Can you use mass spectrometry to calculate the relative atomic mass of an
2.1.1 d ii
element from the relative abundances of its isotopes?
2.1.2 a Can you write formulae of ionic compounds from ionic charges?
Can you predict ionic charge from the position of an element in the periodic
2.1.2 a i
table?
­ 2
Can you recall the names and formulae for the following ions: NO3 , CO3 ,
2.1.2 a ii 2­ + 2+ +
SO4 , OH­, NH 4 , Zn , and Ag ?
Can you construct balanced chemical equations (including ionic equations),
2.1.2 b including state symbols, for reactions studied and for unfamiliar reactions
given appropriate information?
© Oxford University Press 2015 www.oxfordsecondary.co.uk/acknowledgements
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OCR Chemistry A
Amount of substance
Specification Checklist
reference questions
Can you use the terms relative molecular mass , Mr, and relative formula
2.1.1 e
mass and their calculation from relative atomic masses?
2.1.3 a i
Can you explain and use the term a
mount of substance?
ole
Can you explain and use the term m (symbol `mol'), as the unit for amount
2.1.3 a ii
of substance?
Can you explain and use the term the A vogadro constant, NA (the number of
2.1.…read more

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OCR Chemistry A
Can you perform calculations, using amount of substance (in moles),
2.1.3 e iii
involving solution volume and concentration?
2.1.3 f
Can you give the ideal gas equation: pV = nRT?
2.1.3 g Can you use stoichiometric relationships in calculations?
Can you use calculations to determine the percentage yield of a reaction or
2.1.3 h i
related quantities?
2.1.3 h ii Can you use calculations to determine the atom economy of a reaction?
Can you describe the techniques and procedures required during
2.1.…read more

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OCR Chemistry A
Acids and redox
Specification Checklist
reference questions
Can you give the formulae of the common acids (HCl, H2SO
4 , HNO
3 and
2.1.4 a
CH3COOH)?
2.1.4 a Can you give the formulae of the common alkalis (NaOH, KOH and NH3)?
Can you explain that acids release H+
ions in aqueous solution and alkalis
2.1.4 a ­
release OH ions in aqueous solution?
2.1.4 b Can you explain strong and weak acids in terms of relative dissociations?
2.1.…read more

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OCR Chemistry A
Can you describe oxidation and reduction in terms of changes in oxidation
2.1.5 d ii
number?
Can you describe redox reactions of metals with acids to form salts, including
2.1.5 e
full equations?
Can you interpret redox equations and unfamiliar redox reactions, to make
2.1.5 f
predictions in terms of oxidation numbers and electron loss/gain?
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OCR Chemistry A
Electrons and bonding
Specification Checklist
reference questions
2.2.1 a Can you give the number of electrons that can fill the first four shells?
Can you describe atomic orbitals as a region around the nucleus that can
2.2.1 b i
hold up to two electrons, with opposite spins?
2.2.1 b ii Can you describe atomic orbitals the shapes of s and porbitals?
Can you describe atomic orbitals the number of orbitals making up
2.2.…read more

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OCR Chemistry A
2.2.2 e Can you construct `dotandcross' diagrams of molecules and ions?
Can you construct `dotandcross ' diagrams of molecules and ions to
2.2.2 e i
describe single covalent bonding?
Can you construct ` dotandcross ' diagrams of molecules and ions to
2.2.2 e ii
describe multiple covalent bonding?
Can you construct `dotandcross ' diagrams of molecules and ions to
2.2.2 e iii
describe dative covalent (coordinate) bonding?
Can you use the term
average bond enthalpy as a measurement of covalent
2.2.…read more

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OCR Chemistry A
Shapes of molecules and intermolecular forces
Specification Checklist
reference questions
Can you describe the shapes of, and bond angles in, molecules and ions with
up to six electron pairs (including lone pairs) surrounding the central atom as
2.2.2 g
predicted by electron pair repulsion, including the relative repulsive strengths
of bonded pairs and lone pairs of electrons?
Can you use electron pair repulsion to explain the following shapes of
2.2.…read more

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OCR Chemistry A
Can you explain the effect of structure and bonding on the physical properties
2.2.2 o of covalent compounds with simple molecular lattice structures including
melting and boiling points, solubility and electrical conductivity?
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OCR Chemistry A
Periodicity
Specification Checklist
reference questions
Can you describe the periodic table as the arrangement of elements by
3.1.1 a i
increasing atomic (proton) number?
Can you describe the periodic table as the arrangement of elements in
3.1.1 a ii periods showing repeating trends in physical and chemical properties
(periodicity)?
Can you describe the periodic table as the arrangement of elements in
3.1.1 a iii
groups having similar chemical properties?
Can you explain the periodic trend in electron configurations across Periods 2
3.1.…read more

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