Practice Internal Energy Vs. Enthalpy (1.1) - Unit 5: Energetics and Thermochemistry

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6 sample questions

Question 1.
Define internal energy.
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Consider the energies of particles in a system.
Question 2.
What is enthalpy?
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Think about its relation to pressure and volume.
3Question 3.
What does ΔE represent in thermodynamics?
- A measure of temperature change
- The change in internal energy
- The measure of kinetic energy
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Recall what ΔE stands for in energy terms.
4Question 4.
True or False: Enthalpy is a state function.
- True
- False
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Think about what characterizes state functions.
Question 5.
A chemical reaction has an internal energy change of 200 kJ; however, 50 kJ of work is done on the system. What is the heat exchanged with the surroundings?
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Think about the relationship between internal energy change and the work done.
Question 6.
A reaction is exothermic with ΔH = -100 kJ. If the enthalpy of formation for the reactants is -200 kJ, what is the enthalpy of formation for the products?
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Consider how reactants and products relate through enthalpy change.

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