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