CHM 152 - Chapter 16 quiz

Which of the following is true for exothermic processes?

two of these

Which of the following statements is always true for a spontaneous process? I. Delta Ssys > 0 II. Delta Ssurr > 0 III. Delta Suniv > 0 IV. Delta Gsys > 0

III. Delta Suniv >0

Which statement is true?

All real processes are irreversible

Which of the following is true?

By spontaneous we mean that the reaction or process will always proceed to the right (as written) even if very slowly. Increasing the temperature may speed up the reaction, and it generally affects the spontaneity of the reaction

Which of the following processes should show the greatest increase in entropy?

C6H6(l) + 15/2 O2(g) --> 6CO2(g) + 3H2O(g)

In which case must a reaction be spontaneous at all temperatures?

Delta H is negative, Delta S is positive

Consider the reaction 2N 2O 5( g) 4NO 2( g) + O 2( g) at 25°C for which the following data are relevant: N2O5 DHf° = 11.289 kJ/mol S° = 355.32 J/K mol NO2 DHf° = 33.150 kJ/mol S° = 239.90 J/K mol O2 DHf° = 0 kJ/mol S° = 204.80 J/K mol Which of the following is true for this reaction?

Delta H° opposes the reaction, but Delta S° favors it.

Which item (a, b or c) in each of the three groups below has the lowest entropy? I. (a) 10 g ice (b) 10 g water vapor (c) 10 g liquid water II. (a) 1 mole NaCl solid (b) 1 mol NaCl in 1 M aqueous solution (c) 1 mol molten NaCl III. (a) 1 mole C 2H 6(g), (b) 1 mole CH 4(g), (c) 1 mol C 3H 8(g) all at 25 °C and 1 atm

a, a, b

In which of the following pairs is the substance with the HIGHER entropy listed first? I. NaCl(s), NaCl(aq) II. CO(g), CO 2(g) III. 1 mole of H 2(g) at 25 °C; 1 mole of H 2(g) at 50 °C

none of them

Which of the following is not a state function?

q