CHM 2045C Module 7 Thermochemistry
Name: __________________
Module
Seven: Part B Discussion Questions 10
points
For
the exam, your instructor will select four of the following questions for you
to write the answers:
1. What is the standard state
of an element or compound substance?
2. Why does water
have a high specific
heat capacity? What does this
mean?
3. Write four different mathematical expressions
for the 1st Law
of Thermodynamics. How are they related?
4. Where does the energy come from in an endothermic process?
And where does it go?
5. Define standard
molar enthalpy of formation ∆ Hºf . Why is the standard enthalpy of formation of a pure element
in its most stable form defined as zero?
6. Define a spontaneous reaction. How can you tell whether a
reaction is spontaneous?
7. A system can
exchange energy with its surroundings either by transferring heat or by doing
work. This is expressed by the following equation: Δ E = q +
w
Fill in the chart
with correct signage:
Change
Sign Conversion Effect of Esystem
Work done on
the system by surroundings
Work done by
the system on surroundings
Heat
transferred to system from surroundings
Heat
transferred from system to surroundings