CEM FINAL EXAM Question and answers rated A+
2025/2026
1. Recap: What do we know? Atoms interact electrostatically - interactions range fro
LDF to bonding (of all kinds).
When atoms interact, the system becomes more
stable (and loses energy to surroundings).
All electrostatic interactions require energy to
overcome. The way atoms interact depends on the
arrangement of electrons (valence electrons).
When atoms form new compounds the
properties are emergent (not the sum of the
atoms).
Properties of materials depend upon the types of
bonds, spatial arrangement of atoms, and the
interactions be- tween molecules.
Temperature of phase changes allows us to make
predic- tions about types of interactions.
2. What is Temperature? Measure of "hotness"
Units Celsius, Kelvin (K), Fahrenheit
A change of 1 degree celsius=a change
of 1 K 0 degrees celsius = 273.15 K
0 K=absolute zero (lowest possible temp)
3. What is Temperature? Cont. A useful macroscopic way of thinking about temperatu
is that it tells you in which direction thermal energy
(often called heat) will move.
Energy always moves from a hotter object (higher
temper- ature) to a cooler (lower temperature)
object.
4. Temperature and Thermal If you have 1 drop of boiling water vs. a bucket of boiling
Ener- gy? water...
Do they have the same temperature?
Yes Do they have the same thermal
,energy? No
, CEM FINAL EXAM
Study online at https://quizlet.com/_29ttqb
5.Temperature vs Thermal Energy Thermal energy depends on how
much material you have.
Temperature does not. It only depends on the average KE of the
particles.
So one drop or one bucket of boiling water have the same
temperature but ditterent amounts of thermal energy.
6. Populations vs Individuals At the molecular scale we usually consider populations
(i.e.
a lot of particles)
Populations of molecules have a temperature
where av- erage KE=(1/2)mv^2=(3/2)kT (where k its
the Boltzmann constant)
ONE molecules can have a KE - but NOT a temperatur
- Temperature is a bulk property.
7. What happens to the average ve- A, Since KE=(1/2)mv^2 the average KE also
increases if the
locity of a gas if the temperature in-
increases?
A. Increase
B. Decrease
C. No effect
8. Maxwell-Boltzmann
Distribution for a Gas (eg
Ne) at Different
Temperatures
9. If the molar mass of the gas
2025/2026
1. Recap: What do we know? Atoms interact electrostatically - interactions range fro
LDF to bonding (of all kinds).
When atoms interact, the system becomes more
stable (and loses energy to surroundings).
All electrostatic interactions require energy to
overcome. The way atoms interact depends on the
arrangement of electrons (valence electrons).
When atoms form new compounds the
properties are emergent (not the sum of the
atoms).
Properties of materials depend upon the types of
bonds, spatial arrangement of atoms, and the
interactions be- tween molecules.
Temperature of phase changes allows us to make
predic- tions about types of interactions.
2. What is Temperature? Measure of "hotness"
Units Celsius, Kelvin (K), Fahrenheit
A change of 1 degree celsius=a change
of 1 K 0 degrees celsius = 273.15 K
0 K=absolute zero (lowest possible temp)
3. What is Temperature? Cont. A useful macroscopic way of thinking about temperatu
is that it tells you in which direction thermal energy
(often called heat) will move.
Energy always moves from a hotter object (higher
temper- ature) to a cooler (lower temperature)
object.
4. Temperature and Thermal If you have 1 drop of boiling water vs. a bucket of boiling
Ener- gy? water...
Do they have the same temperature?
Yes Do they have the same thermal
,energy? No
, CEM FINAL EXAM
Study online at https://quizlet.com/_29ttqb
5.Temperature vs Thermal Energy Thermal energy depends on how
much material you have.
Temperature does not. It only depends on the average KE of the
particles.
So one drop or one bucket of boiling water have the same
temperature but ditterent amounts of thermal energy.
6. Populations vs Individuals At the molecular scale we usually consider populations
(i.e.
a lot of particles)
Populations of molecules have a temperature
where av- erage KE=(1/2)mv^2=(3/2)kT (where k its
the Boltzmann constant)
ONE molecules can have a KE - but NOT a temperatur
- Temperature is a bulk property.
7. What happens to the average ve- A, Since KE=(1/2)mv^2 the average KE also
increases if the
locity of a gas if the temperature in-
increases?
A. Increase
B. Decrease
C. No effect
8. Maxwell-Boltzmann
Distribution for a Gas (eg
Ne) at Different
Temperatures
9. If the molar mass of the gas
