Practice Enthalpy And Heat Flow (5.1) - Unit 5: Energetics and Thermochemistry

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8 questions

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6 sample questions

Question 1.
What is the definition of enthalpy?
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Think about the heat dynamics during a chemical process.
Question 2.
Identify whether the reaction 2H₂ + O₂ → 2H₂O is exothermic or endothermic.
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Consider the release of energy during combustion reactions.
3Question 3.
What type of reaction absorbs heat?
- A) Exothermic
- B) Endothermic
- C) Neutral
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Think about how temperature changes during the reaction.
4Question 4.
True or False: Enthalpy change can be measured indirectly using Hess's Law.
- True
- False
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Consider the significance of path independence in thermodynamic calculations.
Question 5.
Given the formation enthalpy values for O₂, N₂, and NH₃, calculate the ΔH for 2NH₃(g) → N₂(g) + H₂(g).
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You may have to reverse the formation equation for the products.
Question 6.
Explain why reactions with high ΔH are often slow and require a temperature increase to proceed.
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Think about the energy required to break bonds and initiate reactions.

4 more questions in this section. Enroll free to practise them all.