Aqa A Level Chemistry 3.1.8 - Thermodynamics |43 Questions| With Correct Answers.

Why are exothermic reactions more likely to happen, and endothermic reactions less likely to happen? {Ans: The universe favours lower enthalpies, so reactions that result in a lower enthalpy are favoured over reactions that result in a higher enthalpy.}Enthalpy of sublimation {Ans: The enthalpy change when 1 mole of a solid sublimes to form 1 mole of a gas.}Gibb's free energy equation {Ans: ΔG = ΔH - T x ΔS ΔS must ÷ 1000 to be in kJK⁻¹mol⁻¹}What is the symbol for entropy and what is it measured in? {Ans: S JK⁻¹mol⁻¹}As ionic radius of CATION (+) increases, covalent character... {Ans: Decreases.}Second ionisation enthalpy {Ans: The enthalpy change when 1 mole of gaseous 1+ ions loses 1 electron per atom to form 1 mole of gaseous 2+ ions.}