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Page 1

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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…

Page 2

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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…

Page 3

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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…

Page 4

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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…

Page 5

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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…

Page 6

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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?…

Page 7

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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…

Page 8

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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…

Page 9

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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?




© Oxford University Press 2015 www.oxfordsecondary.co.uk/acknowledgements
This resource sheet may have been changed from the…

Page 10

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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…

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