For the following reaction: 2N2O5(g) 

Write the correct dissolving equation for Ag2CrO4 (s) on scratch paper, and then answer the following question. Which of the following is the correct Ksp expression for the dissolving of Ag2CrO4 (s)?   a.  Ksp =[Ag2Cr2+][O42-] b.  Ksp =[Ag+][CrO42-] c.  Ksp =[Ag22+][CrO42-] d.  Ksp =[Ag+][Cr+6][O2-]4 e.   Ksp =[Ag+]2[CrO42-]

The Ksp of Ca3(PO4)2 is 1 x 10-33.   What is the solubility in moles per liter (mol/L) of Ca3(PO4)2 (s) in a 0.01 M Ca(NO3)2 (aq) solution? (Note: The molar mass of Ca3(PO4)2 is not needed in this problem, which asks for moles per L.)   a. 3.2 x 10-14 mol/L b. 3.0 x 10-15 mol/L c. 9.8 x 10-8 mol/L d. 1.6 x 10-14 mol/L e. 5.0 x 10-32 mol/L

An aqueous solution contains 0.034 M Br- and 0.079 M I-.   A chemist wishes to do a fractional precipitation experiment in which he slowly adds Pb+2 , which can form ppts of PbBr2 (s) [Ksp = 4.6 x 10-6] and PbI2(s) [Ksp= 8.4 x 10-9].   Which of the following is entirely correct?a. I- precipitates first when [Pb2+] = 3.4 x 10-7 M b. Br-precipitates first when [Pb2+] = 1.4 x 10-4 M c. I- precipitates first when [Pb2+] = 1.1 x 10-7 M d. Br-precipitates first when [Pb2+] = 4.0 x 10-3 M e. I-precipitates first when [Pb2+] = 1.3 x 10-6 M

A radioactive isotope has a half life,  t½ = 27.3 yr.  If a 43.7 mg sample of the isotope decays for 6.15 yr, how many mg are left? a. 0.0267 mg b. 1722 mg c. 30.5 mg d. 37.4 mg e. 34.9 mg

Suppose data are collected for the reaction: Z → productsWhat rate should replace ? in the following table if the reaction is second order with respect to Z? [Z]  Initial Rate 0.3 M  10 M/min 1.8 ? a. 360 M/min b. 60 M/min c. 10 M/min d. 120 M/min e. 0.278 M/min

For the redox reaction in the previous problem, in acidic solution: 3 SO-24 + 2Cr(s) + 12 H+ → 3 SO2 (g) + 2Cr+3 + 6 H2O (acidic)    What is

Classify H2CO3 as a strong base, weak base, strong acid, or weak acid, and then answer the followingquestion. What is the pH ofa 0.321 M H2CO3 (aq) solution? a. 6.9 b. 8.6 c. 5.4 d. 10.6 e. 3.4

Write the correct dissolving equation for Au(OH)3 (s) on scratch paper, and then answer the following question. Will a ppt of Au(OH)3 (s) form if you mix 2.8 x 10-12 M Au3+ (aq) with 5.6 x 10-10 M OH- (aq)? Which of the following is entirely correct?   a.  Q= 4.9 x 10-40, ppt forms b.  Q= 4.9 x 10-40,  no ppt  c.  Q=1.3 x 10-8, no ppt d.  Q=7.7 x 10-11, ppt forms e.  Q=7.7 x 10-11, no ppt 

If ÄH and ÄS are both negative for a reaction, then the reaction is: a. nonspontaneous at low temperatures and spontaneous at high temperatures. b. spontaneous at low temperatures and nonspontaneous at high temperatures. c. spontaneous at all temperatures. d. nonspontaneous at all temperatures.   e. none of the choices given above