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Outline:
 1.8) If increasing the concentration of A in a chemical reaction causes no increase in the rate of the reaction, then we may say:A) the reaction rate is zero order in AB) A is not involved in the reactionC) the reaction rate is first order in [A]D) the reaction rate is zero order in [A]E) A is a catalystAns:D
演講者: 洪國明
觀看 (247), 討論 (0)
演講日期: 2015-04-11
上架時間: 2015-04-16
上傳者: energy4104
00:32
Outline:
 1.9) The reaction A + B →C + D is second order in A and zero order in B. The value of k is 0.012 M-1 min-1. What is the rate of this reaction when [A] = 0.125 M and [B] = 0.435 M?A) 3.4 × 10-3 M min-1B) 1.3 M min-1C) 5 × 10-4 M min-1D) 1.9 × 10-4 M min-1E) 1.5 × 10-3 M min-1Ans:D
演講者: 洪國明
觀看 (230), 討論 (0)
演講日期: 2015-04-11
上架時間: 2015-04-16
上傳者: energy4104
00:54
Outline:
 1.10) Calculate rate constant k for a first order reaction with a half-life of 75.0 min.A) 2.67 × 10-2 min-1B) 1.54 × 10-4 min-1C) 1.33 × 10-2 min-1D) 9.24 × 10-3 min-1E) 52.0 min-1Ans:D
演講者: 洪國明
觀看 (272), 討論 (0)
演講日期: 2015-04-11
上架時間: 2015-04-16
上傳者: energy4104
00:34
Outline:
 1.11) Which of the following statements is INCORRECT?A) In a zero order reaction the rate remains constant throughout the reaction.B) Radioactive decay is a first order reaction.C) In gaseous reactions [A] can be expressed as concentration or as pressure.D) For a first order reaction ln [A]t/[A]o = kt.E) Half-life in a first order reaction is constant.Ans:D
演講者: 洪國明
觀看 (241), 討論 (0)
演講日期: 2015-04-11
上架時間: 2015-04-16
上傳者: energy4104
00:33
Outline:
 1.12) In the first order reaction A →products, [A] = 0.400 M initially and 0.250 M after 15.0 min, what will [A] be after 175 min?A) 3.70 × 10-2 MB) 1.04 × 10-3 MC) 1.67 × 10-3 MD) 2.31 × 10-1 ME) 6.024 × 10-3 MAns:C
演講者: 洪國明
觀看 (302), 討論 (0)
演講日期: 2015-04-11
上架時間: 2015-04-16
上傳者: energy4104
00:50
Outline:
 1.13) The rate constant for a reaction at 25.0 °C is 0.010 s-1 , and its activation energy is 35.8 kJ. Find the rate constant at 50.0 °C.A) 0.021 s-1 B) 0.0033 s-1 C) 0.031 s-1 D) 0.010 s-1Ans:C
演講者: 洪國明
觀看 (270), 討論 (0)
演講日期: 2015-04-11
上架時間: 2015-04-16
上傳者: energy4104
01:11
Outline:
 1.14) In the reaction, A → Products, the initial rate of reaction is 3.6 × 10-4 M · s-1 when the initial concentration of A is 0.583 M. What will [A] be at t = 25 s?A) 0.146 B) 0.009 C) 0.574 D) 0.344 E) 0.462Ans:C
演講者: 洪國明
觀看 (233), 討論 (0)
演講日期: 2015-04-11
上架時間: 2015-04-16
上傳者: energy4104
00:34
Outline:
 1.15) Activation energy is:A) minimum kinetic energy that molecules must bring to their collisions for a chemical reaction to occurB) energy at the bottom of the reaction curveC) the kinetic energy of solution stirring that brings the reaction to startD) the heat energy in Joules required to break the bonds in one reactantE) an energy that a catalyst brings to the system to activate one of the reactantsAns:A
演講者: 洪國明
觀看 (197), 討論 (0)
演講日期: 2015-04-11
上架時間: 2015-04-16
上傳者: energy4104
00:47
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