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United StatesChemistryQuick questions

Unit 6: Thermodynamics

Quick questions on Hess's law - AP Chemistry Unit 6

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?
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A reaction with ΔH=150 kJ\Delta H = -150\ \text{kJ} is reversed and halved in a Hess's law sum. State its contribution to the total. [2 points]
What is q2?
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Explain why Hess's law lets us find the enthalpy of a reaction that is hard to measure directly. [2 points]
What are not cancelling intermediates?
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After manipulating, the intermediate species must cancel so that only the target reactants and products remain.

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