Course Home Page Thermodynamics Quiz Number: 6 Course Name: Chemistry Course No.132 Quiz N0. : 6 Teacher: Billy Cook Teacher's Home Page: http://www.iaonline.com/chemistry/chemistr1.htm Teacher's Email: Bcook@icc.cc.il.us No. of Questions= 5 1. Which of the following must have a negative value for an exothermic reaction? a) enthalpy change b) entropy change c) free energy change d) electrode cell potential e) equilibrium constant 2. Which of the following is true when one mole of dry ice sublimes to gas at -78oC? 1. The entropy decreases. 2. The entropy increases. 3. The order increases. a) 1 only b) 2 only c) 3 only d) 1 and 3 only e) 2 and 3 only 3. The heat of vaporization of methanol, CH3OH, is 36.8 kJ/mol. Its boiling point is 64.7oC. The change in entropy for the vaporization of methanol in J/mol.K is: a) -17.8 b) 3.41 c) 17.8 d) 109 e) 569 4. Which of the following processes involve an increase in DSo?1. Br2(l) Br2(g) 2. 2 NO(g) + O2(g) 2 NO2(g) 3. MgSO3(s) MgO(s) + SO2(g) 4. 2 HgO(s) 2 Hg(l) + O2(g) a) 1 and 2 b) 2 and 3 c) 3 and 4 d) 1, 3, and 4 e) 1, 2, 3, and 4 5. Calculate DSo for the decompostion of ozone, O3, to oxygen. 2 O3(g) 3 O2(g) So = 205 J/mol.K for O2(g) and 239 J/mol.K for O3(g) at 25oC. a) +137 J/mol.K b) -137 J/mol.K c) +34 J/mol.K d) -34 J/mol.K e) +444 J/mol.K Go to top of quiz © Bcook Illinois Central College Created with QuizPlease
Quiz Number: 6 Course Name: Chemistry Course No.132 Quiz N0. : 6 Teacher: Billy Cook Teacher's Home Page: http://www.iaonline.com/chemistry/chemistr1.htm Teacher's Email: Bcook@icc.cc.il.us
No. of Questions= 5
1. The entropy decreases.
2. The entropy increases.
3. The order increases.
1. Br2(l) Br2(g)
2. 2 NO(g) + O2(g) 2 NO2(g)
3. MgSO3(s) MgO(s) + SO2(g)
4. 2 HgO(s) 2 Hg(l) + O2(g)
2 O3(g) 3 O2(g)
So = 205 J/mol.K for O2(g) and 239 J/mol.K for O3(g) at 25oC.