Chem paper 1 2020 mistakes

explain why the enthalpy of hydration becomes less exothermic from Li+ to k+

Li+ has a higher charge density than k+

Electrostatic attraction between metal ion and lone pair on oxygen of water decreasing from Li+ to k+

Explain why a solution containing [Al(H2O)6]3+ has a pH <7

al3+ has a high charge density, weakens O-H bond releasing H+ ions

state effect of the addition of a catalyst on the value of Kp and explain your answer

no effect

Catalyst only affects position of equilibrium,

what represents entropy change

(-delta s) on a graph

the gradient

What represents the enthalpy change on a graph

the y intercept