GCSE 9-1 Chemistry equations:
Number of moles
mass in g (of an element or compound) / Mr (of the element or compound)
Volume of gas (dm cubed)
mass of gas (g)/ Mr of gas x 24
Percentage yield
mass of product actually made (g) / maximum theoretical mass of product (g) x 100
Concentration (g/dm cubed)
mass of solute (g) / volume of solvent (dm cubed)
Percentage mass of an element in a compound
Ar x number of atoms of that element / Mr of the compound x 100
Rate of reaction
amount of reactant used of or amount of product formed / time
Gradient
change in y/ change in x
Number of moles
concentration x volume
Rf
distance travelled by substance compound (A)/ distance travelled by solvent (B)
Concentration (mol/dm cubed)
number of moles of solute (mol) / volume of solvent (Dm cubed)
Uncertainty
range / 2
Atom economy
relative formula mass of desired products / relative formula mass of all reactants x 100
Relative atomic mass (Ar)
sum of (isotope abundance x isotope mass number) / sum of abundances of all isotopes
Surface area to volume ratio
surface area / volume