A positive enthalpy change (ΔH = +20 kJ/mol) indicates the process is

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

A positive enthalpy change (ΔH = +20 kJ/mol) indicates the process is

Explanation:
Enthalpy change shows heat exchanged with surroundings at constant pressure. A positive value means the system absorbs heat from the surroundings, so the process is endothermic. The heat input is why the system gains energy per mole. The other ideas don’t fit because exothermic would release heat (negative ΔH), isothermal is about keeping temperature constant (not determined by the sign of ΔH), and catalytic describes a speed-up of the reaction rather than heat transfer.

Enthalpy change shows heat exchanged with surroundings at constant pressure. A positive value means the system absorbs heat from the surroundings, so the process is endothermic. The heat input is why the system gains energy per mole. The other ideas don’t fit because exothermic would release heat (negative ΔH), isothermal is about keeping temperature constant (not determined by the sign of ΔH), and catalytic describes a speed-up of the reaction rather than heat transfer.

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