Chem 103 Module 6 UPDATED ACTUAL
Exam Questions and CORRECT Answers
Kinetic Molecular Theory (KMT) - CORRECT ANSWER -1.) Gases consist of tiny
particles that move at different speeds and in every possible direction in constant motion
2.) The size of gas particles is much smaller than the distance between them; most of the volume
of gas is empty space
3.) There is no force of attraction or repulsion between gas particles; because molecules are so
far apart from each other
4.) They undergo billiard-ball-like collisions (elastic) with the walls of the container and with
each other
gas laws are derived from KMT
if temp is increased... - CORRECT ANSWER --speed and kinetic energy of gas molecules
increase, pressure increases
-pressure held constant by increasing volume, greater distance traveled by molecules so
decreased collision frequency
if volume is decreased - CORRECT ANSWER -frequency of collisions increases, distance
decreases, pressure increases
more molecules= - CORRECT ANSWER -more volume
total pressure= - CORRECT ANSWER -sum of partial pressures
Kinetic Energy (KE) - CORRECT ANSWER -the energy of particle motion
1/2mv^2
The same amount of any ideal gas at the same temp will have the same KE
, Average Kinetic Energy - CORRECT ANSWER -averaged energy over all gas molecules
in the sample
KE(bar on top)= 3/2 RT
R=8.314 J/molK
Root Mean Square Velocity - CORRECT ANSWER -Vrms= square root(3RT/M)
if temp of gas increases - CORRECT ANSWER -average kinetic energy increases
if temp of gas decreases - CORRECT ANSWER -average kinetic energy decreases
diffusion - CORRECT ANSWER -process by which molecules disperse in space in
response to differences in concentration
grahams law - CORRECT ANSWER -the rate of diffusion of a gas is inversely
proportional to the square root of the mass of its particles
rate of diffusion - CORRECT ANSWER -1/square root of molar mass
ppm - CORRECT ANSWER -parts per million
ppb - CORRECT ANSWER -parts per billion
thermochemistry - CORRECT ANSWER -amount of heat absorbed or released during a
reaction
potential energy - CORRECT ANSWER -energy an object has because of its relative
position, composition, or condition
Exam Questions and CORRECT Answers
Kinetic Molecular Theory (KMT) - CORRECT ANSWER -1.) Gases consist of tiny
particles that move at different speeds and in every possible direction in constant motion
2.) The size of gas particles is much smaller than the distance between them; most of the volume
of gas is empty space
3.) There is no force of attraction or repulsion between gas particles; because molecules are so
far apart from each other
4.) They undergo billiard-ball-like collisions (elastic) with the walls of the container and with
each other
gas laws are derived from KMT
if temp is increased... - CORRECT ANSWER --speed and kinetic energy of gas molecules
increase, pressure increases
-pressure held constant by increasing volume, greater distance traveled by molecules so
decreased collision frequency
if volume is decreased - CORRECT ANSWER -frequency of collisions increases, distance
decreases, pressure increases
more molecules= - CORRECT ANSWER -more volume
total pressure= - CORRECT ANSWER -sum of partial pressures
Kinetic Energy (KE) - CORRECT ANSWER -the energy of particle motion
1/2mv^2
The same amount of any ideal gas at the same temp will have the same KE
, Average Kinetic Energy - CORRECT ANSWER -averaged energy over all gas molecules
in the sample
KE(bar on top)= 3/2 RT
R=8.314 J/molK
Root Mean Square Velocity - CORRECT ANSWER -Vrms= square root(3RT/M)
if temp of gas increases - CORRECT ANSWER -average kinetic energy increases
if temp of gas decreases - CORRECT ANSWER -average kinetic energy decreases
diffusion - CORRECT ANSWER -process by which molecules disperse in space in
response to differences in concentration
grahams law - CORRECT ANSWER -the rate of diffusion of a gas is inversely
proportional to the square root of the mass of its particles
rate of diffusion - CORRECT ANSWER -1/square root of molar mass
ppm - CORRECT ANSWER -parts per million
ppb - CORRECT ANSWER -parts per billion
thermochemistry - CORRECT ANSWER -amount of heat absorbed or released during a
reaction
potential energy - CORRECT ANSWER -energy an object has because of its relative
position, composition, or condition
