Practice Final

# 12 list the substances nacl h 2 co and hf in order of

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_____ 12. List the substances NaCl, H 2 , CO and HF in order of increasing boiling points. a) CO < H 2 < NaCl < HF b) H 2 < CO < HF < NaCl c) H 2 < HF < CO < NaCl d) H 2 < CO < NaCl < HF _____ 13. Which of the following gases is most soluble in water? _____ 14. The unit cell at the right is termed _? _ and contains _? _ atoms. _____ 15. The gas constant, R, equals 0.0821 L-atm/mol-K and also equals 8.314 J/mol-K. Therefore 1.00 J equals ______ 16. A reaction has an activation energy of 40 kJ and an overall energy change of –100 kJ. What is the potential energy diagram which best describes this reaction? Energy Reaction Progress

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Page 5 Useful Information: R = 0.0821 l atm/mol K or 8.31 J/K mol 760 torr –273 o C Avogadro's No. 6.02 x 10 23 face diagonal = 2 edge body diagonal = 3 edge Useful equations: Rate = k [A] Rate = k[A] 2 k = A e –Ea/RT ln [A] = –kt + ln [A] o 1 1 = kt [A] [A] o ln [A] = –kt [A] o t 1/2 = [A] o t 1/2 = ln 2 t 1/2 = 0.693 2k k k Energies of Molecular Orbitals lowest ----------------------------------------------------->highest σ 1s σ * 1s σ 2s σ * 2s π 2p σ 2p π * 2p σ * 2p Δ t = K fp m Δ t = K bp m π = MRT Vapor Pressure of Water at Various Temperatures 0.0 o C 4.6 torr 30.0 o C 31.8 torr 20.0 o C 17.5 torr 50.0 o C 92.5 torr 25.0 o C 23.8 torr 100.0 o C 760 torr Acid K a Conj. Base K b Hydrofluoric Acid HF 7.2 x 10 –4 F 1.4 x 10 –11 Benzoic Acid C 6 H 5 CO 2 H 6.3 x 10 –5 C 6 H 5 CO 2 1.6 x 10 –10 Acetic Acid CH 3 CO 2 H 1.8 x 10 –5 CH 3 CO 2 5.6 x 10 –10 Ammonium ion NH 4 + 5.6 x 10 –10 NH 3 1.8 x 10 -5
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