Practice Standard Enthalpy Of Reaction (δh_rxn°) (1.2.2.4) - Unit 5: Energetics and Thermochemistry

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6 sample questions

Question 1.
What is the standard enthalpy of formation (ΔH_f°)?
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Think about the formation process from elements.
Question 2.
How do you determine if a reaction is exothermic?
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Recall the sign of ΔH for reactions that release heat.
3Question 3.
What is ΔH_rxn°?
- The enthalpy change at constant pressure
- The enthalpy change at constant volume
- The internal energy change
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Recall that ΔH is associated with pressure changes.
4Question 4.
True or False: A negative value for ΔH indicates that the reaction is endothermic.
- True
- False
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Think about how heat is exchanged in reactions.
Question 5.
Given the reaction: C(s) + O₂(g) → CO₂(g) with known ΔH_f° values, calculate the standard enthalpy change.
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You will need to reference enthalpy values for each reactant and product.
Question 6.
Evaluate the ΔH of a reaction where ΔH_f° for reactants and products are provided in a table.
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The key operation here is maintaining focus on stoichiometry.

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