8. Thermochemistry

Internal Energy

Multiple Choice
A gas absorbs 150 J of heat from its surroundings and does 40 J of work on the surroundings. What is the change in internal energy of the system?
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Multiple Choice
Which of the following does the internal energy of an ideal gas depend upon?
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Multiple Choice
Based on a diagram showing heat being absorbed by a system and work being done on the system, does this represent an increase or decrease in the internal energy of the system?
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Multiple Choice
An unknown gas expands in a container increasing the volume from 4.3 L to 8.2 L at a constant pressure of 931 mmHg. Calculate the internal energy of the system if the system absorbs 2.3 kJ of energy.
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Multiple Choice
A gas reaction is allowed to take place in a canister while submerged in water at a temperature of 25^oC. The gas expands and does P-V work on the surroundings equal to 385 J. At the same time, the temperature of the water decreases to 20^oC as the energy in the gas reaction reaches 364 J. What is the change in energy of the system?
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Multiple Choice
Which of the following represents a state function?
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Multiple Choice
Which of the following processes must always result in a net increase in internal energy of the system?
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Open Question
Classify the following by the sign of δe for the system.
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Open Question
Which statement is true of the internal energy of a system and its surroundings during an energy exchange with a negative δusys ?
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Open Question
Does a change in energy always indicate that a chemical reaction has taken place?
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