Question of the Day:
How would you diagram the
reaction below?
CaO(s) + H2O(l) → Ca(OH)2(s) + 65.2 kJ
CaO(s) + H2O(l)
H
+
65.2
kJ –
Ca(OH)2(s)
Day 4 3-6
LAB
Hand in lab reports now.
Presentations now.
TEST
Period 1 = Wednesday 3-11 day 1
Period 3 = Tuesday 3-10 day 6
Review
1. What factors determine the
heat capacity of an object?
mass and chem. Comp.
Review:
A 2.20-g sample of quinone, C6H4O2, is
burned in a bomb calorimeter whose
total heat capacity is 7.854 kJ/°C. The
temperature of the calorimeter
increases from 23.44°C to 30.57°C.
What is the heat of combustion per
gram of quinone? Per mole of quinone?
(Molecular weight of quinone is 108.1.)
-25.5 kJ/g and -2750 kJ/mol
ASSIGNMENT:
READ section 18.5
and complete #s 46-53 ALSO
complete #s 75, and 77-80 on
page 638
- Due Friday 3-6 (pd 1 may use
double today and pd 3 may use
double tomorrow)
QUESTION OF THE DAY:
The normal boiling point of ethanol
is 78.5°C. Is the vaporization of
ethanol an endothermic or
exothermic process? In what
temperature range is the
vaporization of ethanol a
spontaneous process?
endothermic, T > 78.5°C
Day 5 3-9
LAB
Hand in lab reports now.
Presentations now.
TEST
Period 1 = Wednesday 3-11 day 1
Period 3 = Tuesday 3-10 day 6
Practice Problem:
Methanol, CH3OH, can be made by the
reaction of CO with H2:
CO(g) + 2H2(g)
 CH3OH(g)
H° = -90.7 kJ/mol + S° = -90.88 J mol-1 K-1
How is G° for the rxn expected to vary with
increasing T? Under standard conditions is
the rxn spontaneous at 298 K? Explain.
Optional Practice
pages 586-588: #s 47, 48, 59,
65, 66, 74, 76, 78, and 89 (part a
only)
Pages 638-639: #s 77 and 81
http://wps.prenhall.co
m/esm_brown_chemist
ry_9/2/660/169060.cw/i
ndex.html
Homework # 4
Chapter 5
Optional Practice (test questions)
http://wps.prenhall.co
m/esm_brown_chemist
ry_9/2/660/169060.cw/i
ndex.html
And Homeworks 1 and
2 Chapter 19
QUICK TALK
Enthalpy
Endothermic
Disorder
Spontaneous
ΔH
12
QUICK TALK
Gibbs Free Energy
Exothermic
Enthalpy
Spontaneous
ΔS
13