Practice Calorimetry And Hess’s Law (2) - Unit 5: Energetics and Thermochemistry

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6 sample questions

Question 1.
What is the purpose of a coffee-cup calorimeter?
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Think about reactions in solutions.
Question 2.
Define Hess’s Law.
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Focus on the concept of path independence.
3Question 3.
What does the coffee-cup calorimeter measure?
- Heat exchanged
- Pressure
- Volume
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Remember, it's a calorimeter!
4Question 4.
True or False: Hess’s Law depends on the path of a reaction.
- True
- False
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Consider what a state function means.
Question 5.
Determine the heat capacity of a calorimeter if 1 g of benzoic acid releases 30,000 J and the temperature rises by 5 °C.
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Use the heat change and temperature change to find heat capacity.
Question 6.
Using Hess's Law, find ΔH for the reaction C + O2 → CO2, given: C + O2 → CO (ΔH1 = -100 kJ) and CO + ½ O2 → CO2 (ΔH2 = -200 kJ).
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Add the enthalpy changes of the stepped reactions.

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