Paper 1

Paper 1 includes: Atomic structure and The Periodic Table; Bonding, structure and properties of matter; Quantitative Chemistry, Chemical changes; Energy changes.

How it's assessed: 1hr 45mins, 100 marks; 50% of GCSE

Paper 2

Formulae

Moles (mol) = Mass (g) / Mr (relative molecular mass)

Moles (mol) = Volume (cm^3) x Concentration (moldm^-3)

Percentage yield = (actual yield / theoretical yield) x 100

Atom economy = (Product or Reactant (Mr) / Total Products or Reactants (Mr)) x 100

Atomic number (Z) < Mass number (A)

Protons = Z, Neutrons = A - Z, Electrons = Z (if it's not an ion)

Ar = (Mr of n isotope(s) * n Abundance(s)) / (ΣAbundance(s))

ΔHr (bond energyinjoules) = ΣΔHf(products) (bonds broken in joules) - ΣΔHf(reactants) (bonds made in joules)

q (joules) = m (grams) x c (J/KgoC) x ΔT (oC)

Specific heat capacity (c) of water = 4184 J/KgoC = 1 KCal

Gas volume (cm^3) = moles (mol) x 24,000 (cm^3)

Retention factor (Rf) = distance moved by spot / distance moved by solvent front

1 mole (of any gas) = 24 dm^3

1000 cm^3 = 1L

1 atm = 759.999951996078 mmHg