13 When ethylene glycol HOCH2CH20H is added to the water in

13) When ethylene glycol, HOCH2CH20H, is added to the water in an automobile radiator, the 13) effect is to A) raise the boiling point and raise the freezing point B) raise the boiling point and lower the freezing point. C) lower the boiling point and raise the freezing point. D) lower the boiling point and lower the freezing point. 14) The first-order reaction, 2 N20(g)- 2 N2(8)+O28), has a rate constant equal to 0.76 s-1 at 1000 14) K. How long will it take for the concentration of N20 to decrease from 1.0 M to .42 M. D) 0.88 s A) 1.8 s B) 1.1 s C) 2.4 s 15) A plot of 1/IBrO 1 vs time is linear for the reaction 3 Bro-(aq) BrO3\"(aq) + 2 Br(aq) What is the order of the reaction with respect to the hypobromite ion, BrO-? A) 0 B) 1 C) 2 D) 3 16) The decomposition of ozone in the stratosphere can occur by the following two-step mechanism: 16) BrO + O Br+02 Which species is a catalyst in this mechanism? A) BrO B) Br C)O D) O3 17) The hydrolysis of tert-butyl chloride is given in the reaction below: 17) (CH3)3CCI(aq) + H20(l)-(CH3)3COH(aq) + H+(m) + Cl-(aq) If the rate law is Rate K(CH3)3CCIl, what is the order of the reaction with respect to water? A) zero B) first C) second D) third

Solution

13) b. raises the boiling point and lowersthe freezing point.

14) Since it is a first order reaction, the rate equation is A=A0(e^-kt) where k is the rate constant.

The answer is 1.1sec.

15) The order of the reaction is 2.

16) Br is the catalyst as it doesnot participate in the reaction but helps the reaction occur at a faster rate.

17) Order of the reaction w.r.t water is ZERO.