Basic chemistry help for students and teachers


Interactive Chemistry Worksheets for Students


Periodic table

Naming compounds

Basic formula

Simple compounds

Ionic compounds 1

Ionic compounds 2

Chemical suffixes

Old chemical names

Hydrocarbons - Alkanes

Alkanes, alkenes & alkynes

Alkanols to alkanoic acids


Common compounds

Common formula quiz

Acids, bases and salts

Covalent compounds

Printable worksheets



There are five chemical formula rearding the mole which you should know.

The units for the formulae may change depending upon the country, however the formulae are basically the same.

If you are studying senior chemistry at high school you should learn these formula and what each of the terms mean.


Molar Terms

V(g) = the volume of a gas in litres. Unit L

VM = the volume of 1 mole of gas at a specified temperature and pressure. Unit L.mol-1


m = the mass of a substance in grams. Unit g

M = the molar mass of a substance. Unitt g.mol-1


q = the energy change in the reaction. Unit kJ

ΔHreaction = The molar heat of reaction. The energy change produced by one mole of reactant. Unit kJ.mol-1


N = The number of particles 

NA = Avogadro's number. The number of particles in one mole


c = the concentration of a liquid in moles per litre. Unit mol.L-1 or M eg. 2.0 M H2SO4 solution

v = the volume of a liquid in litres. Unit L