practice midterm 1.pdf - Professor J.C. Scaiano Department...

Professor J.C. Scaiano
Department of Chemistry Tel.: [phone]
University of Ottawa Fax: [phone]
Ottawa, Canada K1N 6N5
Please print
CHM4155 Family name:
MIDTERM 1 (25%) First name:
4-Feb-2009 Student #:
Time allowed:
70 minutes
Question 1 2 3 4 5 6 7 Total
Value 20 10 5 5 5 5 5 50
Mark
Notes
IMPORTANT : You must answer questions #
1
and #
2
.
then,
Answer
4
questions only from questions 3 to 7 . Please indicate below
which question you do NOT want marked. If you make no selection,
question number
7
will not be marked.
Please do NOT mark question number:


CHM4155 Midterm 1 Feb. 4
th
2009 page 2 of 10
1. (20 MARKS + 2 BONUS –
stars show marks
) Short Answer – no half marks .
a) *A reason why british chemists lost the advantage against the german chemists in the
1800s : ___________________________________________________________________
_________________________________________________________________________
b) The two required conditions for a persistent radical are :
a._____________________________________________________________________
b. ____________________________________________________________________
c) *One way to prevent a combustion reaction from leading to an explosion is
_______________________________________________________________________.
d) *A unimolecular reaction will have a LONGER SHORTER SIMILAR
lifetime if the temperature is increased.
e) *If a catalyst lowers the activation energy of a reaction by 1.3 kcal/mol (without
changing the pre-exponential factor), what would happen to the rate of the reaction?
INCREASE x 10 STAY THE SAME DECREASE x 10 INCREASE x 1.3
DECREASE x1.3
f) *BTX is obtained by catalytic reforming of naphtha. BTX is an acronym for
______________________________________________________________________.
g) *As written, is this reaction endothermic or exothermic? Explain.
H
3
C
CH
H
3
C
CH
4
+
H
3
C
CH
2
H
3
C
CH
3
+
______________________________________________________________________

CHM4155 Midterm 1 Feb. 4
th
2009 page 3 of 10
h) **Complete the following radical reactions.