The total entropy of the universe always increases. This is likely the simplest useful and accurate statement of what entropy is. #(d)# is incorrect, because it directly contradicts the second law of thermodynamics: entropy is the measure of energy dispersal, as a function of temperature. The entropy of a gas is greater than the entropy of a liquid. The entropy of a liquid is greater than the entropy of a solid. Entropy increases as matter or temperature increases. Which of the following statements about entropy is true. Spontaneity also depends on the sign, and sometimes the actual value, of the enthalpy for that process at the same conditions, and not just on the sign of the entropy.įor instance, a reaction at high enough temperature with a negative entropy of the system is never spontaneous, but if the temperature was low and the enthalpy was large and negative, then it can be spontaneous. Answer to Question 78298 in General Chemistry for Chloe Lozano. The absolute entropy of the universe, however, always increases. #(c)# is incorrect, because it's too universal of a claim to be true.Įntropy for the system OR surroundings could decrease in a spontaneous process, but either one could also increase in a spontaneous process. Thus, near #"0 K"# it should be near zero #"J/K"#, and so, it is "at" its minimum, not maximum. #(b)# is incorrect, because it's backwards, contradicting the third law of thermodynamics.įrom the third law of thermodynamics, the entropy of a perfect crystal at #"0 K"# is zero. In other words, it is a measure of how energy can be distributed throughout a chemical system, which pretty much matches #(a)#. The entropy is a measure of the amount of energy dispersal. The definition of entropy that is generally accepted (or should be, in my opinion) is something like: Study with Quizlet and memorize flashcards containing terms like Which of the following shows a decrease in entropy A) precipitation B) gaseous reactants forming a liquid C) a burning piece of wood D) melting ice E) two of these, The second law of thermodynamics states that: A) The entropy of a perfect crystal is zero at 0 K. Here are the reasons why #(a)# is correct and the rest are not.
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