CHEM 1250 Study Guide - Quiz Guide: Rate Equation, Ph, Rice Chart
Dr. Zellmer Chemistry 1250 Friday
Time: 30 mins Spring Semester 2016 April 22, 2016
Quiz III
Name Lab TA/time
----------------------------------------------------------------------------------------------------------------------------------------
Show ALL your work or EXPLAIN to receive full credit.
1. (8 pts) The following mechanism has been proposed for the gas-phase reaction between X
2
and BY.
X
2
(g)
W
2 X(g) (fast, equilibrium)
X(g) + BY(g)
6
XBY(g) (slow)
X(g) + XBY(g)
6
X
2
BY(g) (fast)
(a) What is the overall reaction?
(b) What are the intermediates in the mechanism?
(c) What is the rate-determining step (explain why)?
(d) What is the rate law predicted by this mechanism?
Copyright R. J. Zellmer, April 22, 2016
OVER ...
Document Summary
Show all your work or explain to receive full credit. 1. (8 pts) the following mechanism has been proposed for the gas-phase reaction between x2 and by. 2. (10 pts) for the following reaction kc equals 2. 4 x 10!5, at 25ec. 2! (aq: (5 pts) what are the equilibrium concentrations of ca2+ and so4. 2! if solid caso4 is placed in water to form a saturated solution at 25ec? (show the ice table. 3. (2 pts) which of the following are strong acids or strong bases? (circle all that apply. ) 6. (3 pts) predict the sign of ssys for the following processes. Explain: caco3 (s) 6 cao (s) + co2 (g) b) the temperature of the system increases. 7. (12 pts) you have a solution of 0. 0942 m pyridine, c5h5n, with kb = 1. 7 x 10!9, at 25oc. (show the. State any assumptions made and check your percent error. ) Show work and explain: what are [h+], [oh!
