OC userin Chemistry·7 Nov 201729. How much time (in seconds) does it take light in a vacuum to travel 1.00 billion km? a) 3.00 x 1017 b) 3.33 s c) 3.33 x 10's d) 3.00 x 1020
OC userin Chemistry·6 Nov 201763. The rate constant (k) for a reaction was measured as a function of temperature. A plot of In k versus 1/T in K) is linear and has a slope of -7445 K. Calculate the activation energy for the reac- tion.
OC userin Chemistry·9 Nov 201721. What is the structure of benzene? What are the different ways in which this structure is represented?
OC userin Chemistry·7 Nov 2017Q7. Use Table 19.1 to calculate AGº for the reaction. 2 MnO4 (aq) + Ca(s) — 2 MnO,- (aq) + Cd2+(aq) a) +30.9 kJ b) -30.9 kJC) -185 kJ d) +185 kJ
OC userin Chemistry·7 Nov 2017113. A friend wants you to invest in a new battery she has designed that produces 24 V in a single voltaic cell. Why should you be wary of investing in such a battery?
OC userin Chemistry·5 Nov 201710. Describe Rutherford's gold foil experiment. How did the experi- ment prove that the plum-pudding model of the atom was wrong?
OC userin Chemistry·7 Nov 2017101. This reaction has an activation energy of zero in the gas phase: CH3 + CH3 -C2H5 a. Would you expect the rate of this reaction to change very much with temperature? b. Why might the activation energy be zero? c. What other types of reactions would you expect to have little or no activation energy?
OC userin Chemistry·7 Nov 2017Contains Verified AnswerQ6. Which combination is the best choice to prepare a buffer with a pH of 9.0? a) NH3; NH4Cl (pKb for NH3 is 4.75) b) C5H3N; C3H5NHCl (pKb for CsH3N is 8.76) c) HNO2; NaNO2 (pK, for HNO2 is 3.33) d) HCHO2; NaCHO2 (pK, for HCHO, is 3.74)
OC userin Chemistry·4 Nov 201731. Calculate the percent ionization of a 0.15 M benzoic acid solu- tion in pure water and in a solution containing 0.10 M sodium benzoate. Why does the percent ionization differ significantly in the two solutions?
OC userin Chemistry·6 Nov 201735. The distance from the sun to Earth is 1.496 X 108 km. How long does it take light to travel from the sun to Earth?
OC userin Chemistry·6 Nov 2017Q13. Which distribution of six particles into three interconnected boxes has the highest entropy? a) O b) 0 . o ! d) 00-03
OC userin Chemistry·4 Nov 2017130. The ratio of the mass of O to the mass of N in N2O3 is 12:7. An- other binary compound of nitrogen has a ratio of O to N of 16:7. What is its formula? What is the ratio of O to N in the next member of this series of compounds?
OC userin Chemistry·2 Nov 2017Q5. What is the rate constant for the reaction in Question 4? a) 2.8 x 10-M-2.5-1 b) 14 M-2.5-1 c) 1.4 x 10-M-2.5-1 d) 1.4 x 103 M-2.5-1
OC userin Chemistry·3 Nov 2017119. A 67.2 g sample of a gold and palladium alloy contains 2.49 X 1023 atoms. What is the composition (by mass) of the alloy?
OC userin Chemistry·31 Oct 2017114. The A — first-order integrated rate law for the reaction products is derived from the rate law using calculus: Rate = k[A] (first-order rate law) d[A] Ratedt [A] =- [A] The equation just given is a first-order, separable differential equation that can be solved by separating the variables and inte- grating: d[A] = -kdt TAJ PINA[A] - kat JA), [A] kat In the integral just given, [A]o is the initial concentration of A. We then evaluate the integral: [In[A]] A) = -k[t]6 In[A] - In[A]o = -kt In[A] = -kt + In[A]o (integrated rate law) a. Use a procedure similar to the one just shown to derive an in- tegrated rate law for a reaction A — products, which is one- half order in the concentration of A (that is, Rate = k[A]"). b. Use the result from part a to derive an expression for the half- life of a one-half-order reaction.