Chem 162 Exam 3 with complete verified solutions 2025
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Course
Chem 162
Institution
Chem 162
Thermodynamics
the study of energy transformations
thermochemistry
applied field to chemical reactions
energy
the ability to do work or transfer heat
work
energy used to cause an object that has mass to move
heat
energy used to cause the temperature of an object to ...
Chem 162 Exam 3 with
complete verified solutions
2025
Thermodynamics - answer the study of energy transformations
thermochemistry - answer applied field to chemical reactions
energy - answer the ability to do work or transfer heat
work - answer energy used to cause an object that has mass to
move
heat - answer energy used to cause the temperature of an object
to change
enthalpy - answer the heat energy absorbed or released by a
system during a constant-pressure process deltaH
entropy - answer A measure of the dispersion of energy or
randomness in a system
Enthalpy (H or q) - answer a thermodynamic quantity equivalent to
the heat content of a system (when pressure is constant).
when heat is absorbed by the system from the surrounding, process
is endothermic (+)
when heat is released by the system into the surroundings, the
process is exothermic (-)
, Entropy (S) - answer a thermodynamic function that increases as
the number of energetically equivalent ways of arranging the
components increases
spontaneous processes - answer proceed without any outside
assistance (these processes are irreversible)
Factors Affecting Spontaneity - answer Temperature and Pressure.
(Temperature affects spontaneity of ice melting or freezing)
Nature wants - answer delta S =(+) an increase in entropy -
disorder and randomness
delta H = (-) a decrease in energy to have the lowest potential
energy state (enthalpy)
Some processes will always be spontaneous - answer delta S = (+)
delta H = (-)
Some processes will never be spontaneous - answer delta S = (-)
delta H = (+)
open system - answer both matter and energy can be transferred
to surroundings
closed system - answer only energy and NOT matter can be
transferred to surroundings
isolated system - answer neither matter nor energy can be
transferred to surroundings
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