chemistry equation sheet igcse edexcel
principles of chemistry a) states of matter:
solubility = mass of solid (g) ÷ mass of water removed (g) × 100
b) elements, compounds and mixtures:
rf value = distance travelled by solute ÷ distance travelled by solvent
↓
(the retention factor, ratio of the distance travelled by substance and
solvent)
c) atomic structure:
Ar = (mass of isotopes × abundance) ÷ sum of abundances
↓
(relative atomic mass)
e) chemical formulae, equations and calculations:
mol = mass ÷ Mr
mass = mol × Mr
Mr = mass ÷ mol
percentage yield = actual yield ÷ theoretical yield × 100
principles of chemistry a) states of matter:
solubility = mass of solid (g) ÷ mass of water removed (g) × 100
b) elements, compounds and mixtures:
rf value = distance travelled by solute ÷ distance travelled by solvent
↓
(the retention factor, ratio of the distance travelled by substance and
solvent)
c) atomic structure:
Ar = (mass of isotopes × abundance) ÷ sum of abundances
↓
(relative atomic mass)
e) chemical formulae, equations and calculations:
mol = mass ÷ Mr
mass = mol × Mr
Mr = mass ÷ mol
percentage yield = actual yield ÷ theoretical yield × 100
