Describe the substitution reaction of alkanes with chlorine as a photochemical reaction, with ultraviolet light providing the activation energy, ( E_a ), and draw the structural or displayed formulae of the products, limited to monosubstitution

Calculate the enthalpy change of a reaction using bond energies

Interpret and use symbols for atoms, e.g. ( ^{12}_{6}C ), and ions, e.g. ( ^{35}_{17}Cl^{-} )