8. In the hydrogen atom spectrum, for which of the following transitions the light emission has the longest
wavelength?
(A) n = 6 to n = 5
(B) n = 5 to n = 4
(C) n = 4 to n = 3
(D) n = 3 to n = 2

9. Which of the following statements is true?(A) Water evaporated spontaneously at 1 atm and 101 ˚C because liquid water has the larger entropy thanits vapor at this condition.(B) Water evaporated spontaneously at 1 atm and 101 ˚C because liquid water has the larger free energythan its vapor at this condition.(C) Water evaporated spontaneously at 1 atm and 101 ˚C because liquid water has the larger enthalpy thanits vapor at this condition.(D) none of these.

10. Which of the following is close to the typical bond energy of a covalent bond?(A) 1 Kcal/mol (B) 10 Kcal/mol (C) 100 Kcal/mol (D) 1000 Kcal/mol

11. The majority of shell electron transitions in molecules occur in the region of the electromagneticspectrum.(A) IR (B) X rays (C) UV light (D) microwave

12. CO2 is a greenhouse gas because it absorbs region of the electromagnetic spectrum.(A) IR (B) X rays (C) UV light (D) microwave

13. What is the major effect or transition to make CO2 a greenhouse gas?(A) electronic transition (B) molecular vibration (C) molecular rotation (D) molecular translation.

14. The root mean square speed of N2 at 300 K is about(A) 5170 m/s (B) 517 m/s (C) 51.7 m/s (D) 5.17 m/s.

15. Based on Gibbs Free Energy equation ΔG = ΔH − T ΔS, a process will occur spontaneously when(A) ΔG is positive and ΔS is positive (B) ΔH is positive and ΔT is negative(C) ΔH is negative and ΔS is positive (D) ΔH is negative and ΔS is negative

16. A catalyst is added to a system at equilibrium. The concentration of the reactants will then(A) decrease (B) increase (C) remain constant (D) approach zero

17. What is the limiting high-temperature molar heat capacity at constant volume (Cv) of O2 molecule?(A) 3/2 R (B) 5/2 R (C) 3 R (D) 7/2 R

18. The difference between the potential energy of the products and the potential energy of the reactants in areaction is called(A) The Temperature of Reaction (B) The Heat of Reaction(C) The Change of Reaction (D) The Exothermic Reaction

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