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AQA A-level Chemistry paper 2 2025 Questions and Answers Relative atomic mass (Ar) - --CORRECT ANSWER--Average mass of an atom compared with one twelth of the mass of an atom of carbon 12 Electronegativity - --CORRECT ANSWER--Power of an atom to attract the pair of electrons in a covalent bond Standard enthalpy of combustion - --CORRECT ANSWER--Enthalpy change when 1 mole of a substance burns completely in oxygen under standard conditions with all reactants and products being in their standard state Standard enthalpy of formation - --CORRECT ANSWER--Enthalpy change when 1 mole of a compound is formed from it's elements under standard conditions in their standard states Mean bond enthalpy - --CORRECT ANSWER--The average energy needed to break a certain type of bond over a range of compounds Activation energy - --CORRECT ANSWER--Minimum energy required for colliding molecules to react ....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1