Unit 4 Part 2 LM Questions

What is the sign when the change in system entropy contributes to an increase in reaction spontaneity?

• Negative because of the increase in system order

• Negative because of the increase in system disorder

• Positive because of the increase in system disorder

• Positive because of the increase in system order

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LM 55

What is the best definition of entropy?

•   A measure of the number of microstates of a system

•   A measure of the messiness of a system

•   A measure of the disorder of a system

•   A measure of the free energy of the system

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LM 55

In what direction does heat flow?

•   Heat flows from the cooler object to the hotter object

•   Heat flows from the hotter object to the cooler object

•   Heat flow is random

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LM 55

Which of the following seems likely to have the most microstates, in other words, the most ways to distribute matter?

•   A 22 liter container of water vapor

•   A teaspoon of water

•   A cube of ice

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LM 55

What are the two variables that determine the total change in entropy in a system?

•   the change in free energy and the change in enthalpy

•   the free energy and the temperature

•   the amount of heat and the temperature

•   the amount of heat and the free energy

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LM 55

Which combinations of heat and temperature will produce the largest energy change?

•   1000 J and 10K

•   10 J and 100K

•   100 J and 100K

•   10 J and 1000K

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LM 55

What is the change in system entropy for a reversible process in which 300 J of heat is removed at 27 ^oC?

•   +1 J/K

•   -1 J/K

•   +4.4 J/K

•   -4.4 J/K

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LM 55

What is the change in system entropy for a reversible process in which 3 kJ  of heat is added at 27 ^oC?

•   - 0.01 J/K

•   - 10 J/K

•   0.01 J/K

•   +10 J/K

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LM 55

A thermodynamic microstate is

•   a micron size volume in the system

•   a unique way in which a particle can distribute its energy

•   one millionth of an energy unit

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LM 56

A drop of food coloring spontaneously distributes throughout a container because

•   it seeks to maximize its number of possible microstates

• gravity

• stirring

•   the movement of water molecules

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LM 56