WorksheetsOnRamps Unit 3 ET 19 Practice
Total questions: 42
Worksheet time: 33mins
Intensive property of a system is one whose value
depends on the mass of the system, like volume
does not depend on the mass of the system, like temperature, pressure, etc.
is not dependent on the path followed but on the state
is dependent on the path followed and not on the state
Density - the ratio of mass to volume of a substance
intensive physical property
extensive physical property
What kind of physical property is this? Volume
intensive
extensive
What kind of physical property is this? n, number of moles
intensive
extensive
Which of the following is not an extensive property?
Volume
Mass
Length
Temperature
Which of these properties are state functions?
change in temp. and heat
change in volume and temperature
change in moles and work
heat capacity and change in pressure
According to the kinetic molecular theory, a gas consists of molecules in constant fixed motion.
True
False
According to kinetic molecular theory-Gas molecules influence each other only by collision; they exert no other forces on each other.
True
False
According to the kinetic molecular theory, all collisions between gas molecules are inelastic; all kinetic energy is lost.
True
False
According to the kinetic molecular theory, the volume actually occupied by the molecules of a gas is negligibly small; the vast majority of the volume of the gas is empty space through which the gas molecules are moving.
True
False
In the KMT, pressure is the force exerted against the wall of a container by the continual collision of molecules against it.
True
False
The total kinetic energy of a collection of gas molecules is inversely proportional to the absolute temperature of the gas.
True
False
Real gases (in real life), like to have high temperatures and low pressures. They like to be warm and free flowing.
True
False
Ideal gases (best conditions) are light molecules such as hydrogen and helium. Heavier gases do not follow this rule.
True
False
Real gases have attraction to other gas molecules which is opposite of the kinetic molecular theory. In this way they have an effect on each other that do not completely adhere to KMT.
True
False
Gases like to be in very cold conditions and highly pressurized (just like you).
True
False
If He atoms (mass 4), Ne atoms (10), Ar atoms (40) and Kr atoms (84) at the same temperature, what is true about their average kinetic energy?
He has the highest kinetic energy
Kr has the highest kinetic energy
Ar has the highest kinetic energy
They all have the same kinetic energy
25 degrees Celsius is ___________ K
-248
298
125
-125
Which of the following is an assumption of the kinetic-molecular theory of gases?
Collisions between gas particles are inelastic.
Gases consist of closely spaced particles.
Gas particles move around in an orderly manner.
The temperature of a gas depends on the average kinetic energy of the gas particles.
If a gas has the same temperature throughout, which gas molecule has the highest average velocity?
O2
H2O
H2
Xe
The question below is about the Maxwell–Boltzmann distribution shown for a sample of a gas, X, at two different temperatures. Which statement is correct for the higher temperature?
The area under the curve to the left of Ea decreases as curves spreads out.
The total area under the curve increases.
The activation energy decreases.
More molecules have the mean energy.
Which Nobel gas has around 2000 particles per millions
Neon
Argon
Helium
Krypton
Curves I and II represent samples of the same gas at a constant pressure but a different temperatures. The areas under curves I and II represent?
Curve II is at the lower temperature and there are less molecules in the sample
Curve II is at the lower temperature and there are the same number of molecules in the sample
Curve II is at the higher temperature and there are more molecules in the sample
Curve II is at the higher temperature and there are the same number of molecules in the sample
Which of the following diagrams correctly represents the Boltzmann distribution of molecular speeds at two temperatures T1 and T2, where T2 > T1?
This question is about the Maxwell–Boltzmann distribution of molecular energies in a sample of a gas shown in the figure above. Which letter best represents the mean energy of the molecules?
A
B
C
D
In the illustration, the collision of the red and blue atoms will
speed up their velocities
slow down their velocities
have no effect on their velocities
Grahams law refers specifically to
the rate of diffusion
the rate of effusion
the temperature of gases
the partial and total pressures of gases in a sample.
why would O2 effuse faster than CO2 in the same room
because O2 has more energy
because CO2 has a greater molar mass
because oxygen has a higher temperature
they will effuse the same because the temperature is fixed
Which statement best describes the relationship between the system and the surroundings?
The system is found around the surroundings and includes the surroundings.
The system is found around the surroundings but does not include the surroundings.
The system is found in the surroundings and is part of the surroundings.
The system is found in the surroundings but is not included as part of the surroundings.
Which statement best describes the interaction of the surroundings with a substance that is freezing?
The surroundings are cooler than the substance and absorb thermal energy from it.
The surroundings are cooler than the substance transfer thermal energy into it.
The surroundings are warmer than the substance and absorb thermal energy from it.
The surroundings are warmer than the substance and transfer thermal energy into it.
A hot piece of metal is placed into cooler water. Which statement describes how the second law of thermodynamics relates to this process?
Energy flows from the metal to the water until they are at the same temperature.
Energy flows from the water to the metal until they are at the same temperature.
The amount of energy lost by the metal is equal to the amount of energy gained by the water.
The temperature change of the metal is equal to the temperature change of the water.
A ______ system is one where both energy and matter can be transferred to and from the surroundings
open
closed
Everything else in the universe outside the system is called its ________________________.
universe
system
surroundings
state function
A _______________ system is one where only energy can be transferred to and from the surroundings.
open
closed
The part of the universe that we are studying is called the _______
Enthalpy
Surroundings
Heat
System
The reaction vessel, temperature probe and even your hands can be parts of the ________
Enthalpy
Surroundings
Heat
System
