Learning objective
Define enthalpy change under constant pressure.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
Energetics
Subtopic
Enthalpy change
Study support
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Quick explanation
Define enthalpy change under constant pressure
- This point belongs to Energetics, especially Enthalpy change.
- You need to be able to define enthalpy change under constant pressure.
- The key ideas to know are enthalpy and enthalpy change.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect Enthalpy change to exam-style questions, flashcards, and revision notes for Energetics.
Quick student answer
What is the definition of enthalpy change under constant pressure?
Direct answer
The heat absorbed or released during a reaction at constant pressure.
Key terms
- Enthalpy (H): A thermodynamic quantity equivalent to the total heat content of a system.
- Exothermic reaction: A reaction that releases heat, resulting in a negative enthalpy change.
Common trap
Confusing exothermic and endothermic reactions: Remember that a negative enthalpy change indicates an exothermic reaction, while a positive value indicates an endothermic reaction.
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Revision tools
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Distinguish exothermic and endothermic reactions using enthalpy change signs.
Enthalpy change
- Interpret reaction profile diagrams.
Enthalpy change
- Define standard enthalpy changes for formation, combustion and neutralisation where appropriate.
Enthalpy change
- Use q = mcΔT to calculate heat energy transferred.
Calorimetry and enthalpy measurements
- Convert calorimetry data into molar enthalpy changes.
Calorimetry and enthalpy measurements