multiple choice facts

• a molecule cannot undergo electrophilic substitution with HBr if there is not enough spaces on the alkene for the H and Br to join on to
• enthalpy of atomisation forms one mole
• rate graphs against concentration have nothing to do with time so for a reactant do not start high and decrease
• Al has a higher melting point than Na as it is a bigger ion so stronger metallic bonding
• magnesium + steam -> magnesium oxide + hydrogen
• optical isomerism happens when octahedral complexes have 3 bidentate ligands
• EDTA does optical isomerism