Entropy Thermodynamics Quiz Questions And Answers
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The SI unit of entropy is ________.
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J
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J/s
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J/K
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J/C
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Welcome to the "Entropy Thermodynamics Quiz," your gateway to mastering one of the most fascinating concepts in physics. Entropy, a fundamental measure of disorder within a system, is a key principle in the study of thermodynamics, affecting everything from the flow of heat to the performance of engines and the stability of chemical reactions.
This quiz is meticulously designed to test See moreand deepen your understanding of entropy and how it operates within various thermodynamic processes. Through a series of carefully crafted questions, you will explore the implications of entropy in both natural and engineered systems and its role in determining the direction and feasibility of physical and chemical processes.
It delves into scenarios that illustrate its practical impact on energy transfer, efficiency, and the inevitable march toward greater disorder. Embark on this enlightening journey through our "Entropy Thermodynamics Quiz" and discover the crucial role entropy plays in understanding the world around us.
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- 2.
What is entropy?
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Entropy is a measure of the disorder of a system.
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Entropy is a measure of the net work done by a system.
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Entropy is a measure of the heat transfer of energy into a system.
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Entropy is a measure of the potential energy of a system.
Correct Answer
A. Entropy is a measure of the disorder of a system.Explanation
Entropy is a measure of the disorder of a system. In thermodynamics, it quantifies the randomness or chaos within a system. When the entropy of a system increases, it means that the system becomes more disordered. Conversely, when the entropy decreases, the system becomes more ordered. This concept is closely related to the second law of thermodynamics, which states that the entropy of an isolated system always tends to increase over time. Therefore, the correct answer is that entropy is a measure of the disorder of a system.Rate this question:
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- 3.
Gibbs paradox in statistical mechanics is related to
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Additive property of the energy
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Additive property of the momentum
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Additive property of the entropy
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Additive property of the temperature
Correct Answer
A. Additive property of the entropyExplanation
The Gibbs paradox in statistical mechanics is related to the additive property of the entropy. The paradox arises when considering the entropy of an ideal gas composed of identical particles. According to classical statistical mechanics, the entropy of the system should be additive, meaning that the total entropy of the gas should be equal to the sum of the entropies of each individual particle. However, when considering the indistinguishability of particles, it is found that the total entropy is actually greater than this sum. This paradox highlights the need for quantum statistical mechanics to properly account for the behavior of identical particles.Rate this question:
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- 4.
If a liquid crystallizes into a solid, entropy will
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Increase
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Decrease
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Remains unchanged
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Zero
Correct Answer
A. DecreaseExplanation
When a liquid crystallizes into a solid, the molecules arrange themselves in a more ordered and structured manner. This increase in orderliness leads to a decrease in the system's entropy. Entropy is a measure of the randomness or disorder in a system, so as the liquid transitions into a solid, the molecules become more organized, resulting in a decrease in entropy.Rate this question:
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- 5.
If 10 g of ice at 0°C is converted to water at the same temperature, the change in entropy will be (latent heat 80 cal/g)
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2.93 cal/K
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29.3 cal/K
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3.29 cal/K
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32.9 cal/K
Correct Answer
A. 2.93 cal/KExplanation
When ice is converted to water at the same temperature, the change in entropy can be calculated using the formula ΔS = Q/T, where ΔS is the change in entropy, Q is the heat transferred, and T is the temperature. In this case, the heat transferred is the latent heat, which is given as 80 cal/g. Since we have 10 g of ice, the heat transferred is 80 cal/g * 10 g = 800 cal. The temperature remains constant at 0°C, which is equivalent to 273 K. Plugging these values into the formula, we get ΔS = 800 cal / 273 K = 2.93 cal/K. Therefore, the correct answer is 2.93 cal/K.Rate this question:
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- 6.
If 30 J of energy is added to water in the form of heat at 27 °C, what is the change in entropy of water?
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2.5 J/K
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0.45 J/K
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9.5 J/K
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0.100 J/K
Correct Answer
A. 0.100 J/KExplanation
When energy is added to a substance in the form of heat, the change in entropy can be calculated using the equation ΔS = Q/T, where ΔS is the change in entropy, Q is the heat energy, and T is the temperature. In this case, the heat energy added to the water is 30 J and the temperature is 27 °C, which is equivalent to 300 K. Plugging these values into the equation, we get ΔS = 30 J / 300 K = 0.1 J/K. Therefore, the change in entropy of the water is 0.1 J/K.Rate this question:
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- 7.
In steam tables, the entropy is shown a zero for
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Saturated liquid at atmospheric pressure
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Saturated vapor at atmospheric pressure
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Saturated vapor at 0° C
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Saturated liquid at 0° C
Correct Answer
A. Saturated liquid at 0° CExplanation
In steam tables, the entropy is shown as zero for saturated liquid at 0°C because at this state, the substance is in a perfectly ordered and condensed form. The entropy of a substance is a measure of its disorder or randomness. Since the saturated liquid at 0°C is in its most condensed state, it has the least amount of disorder and hence its entropy is zero.Rate this question:
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- 8.
If a liquid crystallizes into a solid, entropy will be:
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Increased
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Decreased
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Remains unchanged
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Zero
Correct Answer
A. DecreasedExplanation
When a liquid crystallizes into a solid, the particles in the liquid arrange themselves into a more ordered and structured pattern. This increase in order reduces the number of possible arrangements of the particles, resulting in a decrease in entropy. Therefore, the correct answer is decreased.Rate this question:
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- 9.
The Gibbs function (G) in thermodynamics is defined as G = H - TS (where H = enthalpy, T = temperature, S = entropy). In an isothermal, isobaric, reversible process, G
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Is zero
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Remains constant, but is not zero
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Varies linearly
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Varies non-linearly
Correct Answer
A. Remains constant, but is not zeroExplanation
In an isothermal, isobaric, reversible process, the Gibbs function (G) remains constant because the enthalpy (H) and entropy (S) also remain constant. However, it is not necessarily zero because the values of H and S can be non-zero. The equation G = H - TS indicates that G can have a non-zero value depending on the values of H, T, and S. Therefore, in this process, G remains constant but is not zero.Rate this question:
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- 10.
Which of the following has the lowest entropy?
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Oxygen gas at 0K
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Oxygen gas at 30°C
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Oxygen gas at STP
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Oxygen gas at 25°C
Correct Answer
A. Oxygen gas at 0KExplanation
At absolute zero temperature (0K), the particles in a substance have minimal energy and are in their lowest possible energy state. This means that there is only one possible microstate for the particles, resulting in the lowest possible number of arrangements. As entropy is a measure of the number of possible arrangements or microstates, oxygen gas at 0K has the lowest entropy among the given options.Rate this question:
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Current Version
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May 07, 2024Quiz Edited by
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Expert Reviewed by
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Nov 20, 2022Quiz Created by
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