I've found that the definitions my chemistry teacher teach us, the definitions in OCR-approved textbooks, and the definitions on the OCR spec are all different. I'm trying to find out the simplest definitions that would still score full marks on an exam. Currently, I'm between playing it safe and remembering the longer definitions with all 3 sources taken into account or going for the simpler spec definitions, but these seem too simple and good to be true.
for example, here are some differences:
definition of enthalpy change of hydration:
Textbook- enthalpy change that occurs when 1 mole of a gaseous ion is completely hydrated by water
Spec- enthalpy change when dissolving 1 mole of gaseous ions in water
Definition of 1st ionisation energy:
textbook- the energy required to remove 1 electron from each atom in 1 mole of gaseous atoms to form 1 mole of gaseous 1+ ions
Spec- energy required to remove 1 mole of electrons from 1 mole of gaseous atoms
It would be a great help if anyone could guide me on which definitions I should use, thanks