Learning objective
Construct and interpret enthalpy cycles.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Flashcards
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Questions
Topic
Energetics
Subtopic
Applications of Hess's law
Study support
Understand this objective
Quick explanation
Construct and interpret enthalpy cycles
- This point belongs to Energetics, especially Applications of Hess's law.
- You need to be able to construct and interpret enthalpy cycles.
- The key ideas to know are enthalpy cycle.
- 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 Applications of Hess's law to exam-style questions, flashcards, and revision notes for Energetics.
Quick student answer
Which of the following statements about Hess's law is correct?
Direct answer
A) The total enthalpy change for a reaction is independent of the route taken.
Key terms
- Enthalpy change (ΔH): The heat content change of a system at constant pressure, measured in kJ/mol.
- Standard enthalpy of formation (ΔHf°): The enthalpy change when one mole of a compound is formed from its elements in their standard states.
Common trap
Ignoring the sign of enthalpy changes: Always pay attention to the signs of enthalpy changes; exothermic reactions have negative values, while endothermic reactions have positive values.
Related questions
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Flashcard prompts
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Revision tools
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Define enthalpy change under constant pressure.
Enthalpy change
- 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