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Unformatted text preview: 9) Which of the following gases most likely deviates from ideality due to the van der Waals parameter a ? a) He b) Xe *c) NH3 d) F a deals with attraction only (polarity, van der Waals), not charges. 10) If the most probable speed of a Maxwell-Boltzmann Distribution is increased, what happens to the slowest speed of the distribution? a) It increases *b) It remains unchanged c) It decreases d) There is insufficient information to say The lowest speed is always zero. 11) Gas A has a molar mass of 100 g mol-1 and a molar volume of 0.1 L mol-1. Gas B has a molar mass of 100 g mol-1 and a molar volume of 0.2 L mol-1. Assuming the gases have the same density (particles per volume), which of the following statements is true? a) Gas A has a faster effusion rate than Gas B b) Gas A has a faster diffusion rate than Gas B c) Gas A has a higher collision frequency than Gas B d) All of the above *e) None of the above B is true if assume constant temperature; E is true as written, because too little information. 12) Which of the following Kinetic Theory assumptions is violated by charged gases? a) Pure gas is composed of many identical particles b) The particles have negligible volume c) The particles are constantly moving in random directions with a random distribution of speeds d) All collisions are elastic *e) The gas particles only interact with each other during collisions f) None of the above 13) Which of the following statements about enthalpy is false? a) Enthalpy is only defined when ΔV = 0 b) Enthalpy depends on the path taken in a reaction c) Determining a change in enthalpy requires knowledge of the absolute internal energy *d) All of the above e) None of the above 14) Which of the following gases most likely has the largest cP ? a) He b) H2S c) N2 *d) NH3 e) They are all about the same f) There is insufficient information to say 15) 1 kJ of heat is added to a system during a process with ΔT = 0. What is the sign of the work for this process? a) Positive b) Zero c) Negative *d) There is insufficient information to say C is true if ΔU = 0 and q out = 0; B is true if ΔU = 0 and q out = -q in ; as written, can't say, so D. 16) Which of the following statements is most likely true for the formation of O2(g) from atomic oxygen (O(g)) at constant pressure? a) ΔU = ΔH b) ΔV will increase causing more work to be done at constant pressure *c) ΔH will be negative d) The temperature must increase due to the decrease in the number of moles 2) The change in entropy of a system depends on changes in which of the following? a) Temperature b) Volume c) Pressure d) Number of moles e) Less than four but at least two of the above *f) All four of the above g) None of the above 3) Which Law of Thermodynamics implies that real processes are always irreversible?...
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- Fall '10
- Mole, kJ mol-1, insufﬁcient information, mol L-1