Learning objective
(HT only) Include the correct sign or direction of energy transfer when interpreting a calculated energy change.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
Exothermic and endothermic reactions
Subtopic
The energy change of reactions (HT only)
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(HT only) Include the correct sign or direction of energy transfer when interpreting a calculated energy change
- This point belongs to Exothermic and endothermic reactions, especially The energy change of reactions (HT only).
- You need to be able to (HT only) Include the correct sign or direction of energy transfer when interpreting a calculated energy change.
- The key ideas to know are HT only.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
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Why it matters
This objective helps connect The energy change of reactions (HT only) to exam-style questions, flashcards, and revision notes for Exothermic and endothermic reactions.
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What should you know about (HT only) Include the correct sign or direction of energy transfer when interpreting a calculated energy change?
Direct answer
In Chemistry, this page helps you answer questions about (HT only) Include the correct sign or direction of energy transfer when interpreting a calculated energy change within Exothermic and endothermic reactions. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are energy transfer and enthalpy change.
Key terms
- energy transfer: The movement of energy from one system to another, which can be measured in chemical reactions.
- enthalpy change: The heat content change of a system at constant pressure, often represented as ΔH in chemical reactions.
Common trap
Sign Interpretation Error: Always check if the energy change is positive or negative. A negative value indicates an exothermic reaction (energy released), while a positive value indicates an endothermic reaction (energy absorbed).
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Revision notestopic notes
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Open revision notesRelated learning objectives
- State that energy is conserved in chemical reactions.
Energy transfer during exothermic and endothermic reactions
- Explain that a reaction transferring energy to the surroundings leaves products with less energy than the reactants by the amount transferred.
Energy transfer during exothermic and endothermic reactions
- Define an exothermic reaction as one that transfers energy to the surroundings.
Energy transfer during exothermic and endothermic reactions
- Explain that the temperature of the surroundings increases during an exothermic reaction.
Energy transfer during exothermic and endothermic reactions
- Identify combustion, many oxidation reactions and neutralisation as examples of exothermic reactions.
Energy transfer during exothermic and endothermic reactions