All of the following statements about entropy are true EXCEPT a. entropy is zero for elements under standard conditions b. entropy values for pure substances at 25 °C are greater than zero c. the entropy of a substance in the gas phase is greater than the solid phase d. a positive change in entropy is a change towards greater disorder e. entropy is a state function
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Identify the correct statement regarding entropy. (a) at absolute zero temperature, entropy of a perfectly crystalline substance is +ve. (b) at absolute zero temperature, entropy of a perfectly crystalline substance is taken to be zero (c) at absolute zero temperature, entropy of all crystalline substances in taken to be 0 . (d) at $0^{\circ} \mathrm{C}$, entropy of a perfectly crystalline substance is taken to be 0 .
Identify the incorrect statement/s regarding entropy. a. at absolute zero temperature, entropy of perfectly crystalline substance is taken to zero b. at absolute zero temperature, the entropy of perfectly crystalline substance is positive c. at $0^{\circ} \mathrm{C}$ the entropy of perfectly crystalline substance is positive d. at absolute zero temperature, the entropy of all crystalline substances is taken to be zero
Indicate whether each statement is true or false. (a) The second law of thermodynamics says that entropy is conserved. (b) If the entropy of the system increases during a reversible process, the entropy change of the surroundings must decrease by the same amount. (c) In a certain spontaneous process the system undergoes an entropy change of $4.2 \mathrm{J} / \mathrm{K} ;$ therefore, the entropy change of the surroundings must be $-4.2 \mathrm{J} / \mathrm{K}$
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