Empirical & Molecular Formulae The molecular formula is the formula that shows the number and type of each atom in a molecule Eg. the molecular formula of ethanoic acid is C2H4O2 The empirical ...
Balancing Equations A symbol equation is a shorthand way of describing a chemical reaction using chemical symbols to show the number and type of each atom in the reactants and products A word equat...
Formulae of Ionic Compounds Ionic compounds are formed from a metal and a nonmetal bonded together Ionic compounds are electrically neutral; the positive charges equal the negative charges Charges ...
Mole & Avogadro Constant The Avogadro constant (NA or L) is the number of particles equivalent to the relative atomic mass or molecular mass of a substance The Avogadro constant applies to atom...
Relative Masses Atomic Mass Unit The mass of a single atom is so small that it is impossible to weigh it directly Atomic masses are therefore defined in terms of a standard atom which is called the...
Ionisation Energies: Explained Energy is required to remove an outer shell electron as this involves breaking the attractive forces between the electron and the positively charged nucleus There are...
Ionisation Energies: Trends Ionisation energies show periodicity - a trend across a period of the Periodic Table As could be expected from their electronic configuration, the group I metals have a ...
Ionisation Energies The Ionisation Energy (IE) of an element is the amount of energy required to remove one mole of electrons from one mole of gaseous atoms of an element to form one mole of gaseou...
Determining Electronic Configurations Writing out the electronic configuration tells us how the electrons in an atom or ion are arranged in their shells, subshells and orbitals This can be done usi...
