Edexcel IAL Chemistry A2 12.14 Experimental and theoretical lattice energy
Edexcel IAL Chemistry A2 12.14 Experimental and theoretical lattice energy
Compare magnitudes rather than signs alone: a larger experimental–theoretical difference indicates greater departure from the ideal point-ion model and more covalency.
How this is tested
- Calculate or compare lattice-energy differences to rank covalent character.
- State theoretical assumptions such as spherical point ions, full charge and purely ionic bonding.
- Link close agreement to predominantly ionic bonding and a large difference to covalency.