A negative 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 negative enthalpy change (ΔH = -20 kJ/mol) indicates the process is

Explanation:
Negative ΔH means the system releases heat to the surroundings. That heat release is the hallmark of an exothermic process, so this is best described as exothermic. If it were isothermal, there would be no net heat transfer affecting the temperature, so ΔH would effectively be zero; if it were endothermic, heat would be absorbed (positive ΔH); and catalysis changes how fast the reaction proceeds, not how much heat is released or absorbed.

Negative ΔH means the system releases heat to the surroundings. That heat release is the hallmark of an exothermic process, so this is best described as exothermic. If it were isothermal, there would be no net heat transfer affecting the temperature, so ΔH would effectively be zero; if it were endothermic, heat would be absorbed (positive ΔH); and catalysis changes how fast the reaction proceeds, not how much heat is released or absorbed.

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