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# Kinetic Molecular Theory (Grades 11-12)

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## Kinetic Molecular Theory

Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

1.
The Kinetic Molecular Theory of gases states that many particles (i.e., atoms or molecules) are
1. at rest.
2. in constant random motion.
3. in thermodynamic equilibrium.
4. in static equilibrium.

2.
According to the Kinetic Molecular Theory of gases, collisions between molecules are perfectly                .
1. regular
2. linear
3. plastic
4. elastic
3.
Which of the following reflects a correct assumption of the Kinetic Molecular Theory?
1. There are constant forces of attraction between the molecules.
2. There are constant forces of repulsion between the molecules.
3. There are constant forces of attraction and repulsion between the molecules.
4. There are no attractive or repulsive forces between the molecules.

4.
When calculating average kinetic energy using the equation $KE_"avg"=3/2(kT)$, which of the following does k stand for?
1. Ideal Gas constant
2. Boltzmann constant
3. Planck's constant
4. Gay-Lussac constant
5.
The Kinetic Molecular Theory states that the pressure of a gas results from
1. the mass of particles.
2. the collisions of particles with the walls of a container.
3. the forces of repulsion between the particles.
4. the energy loss experienced by each particle.

6.
The Boltzmann constant is equivalent to the ratio of the gas constant, R, to the                 constant.
2. Poisson
3. Boyle’s
4. Charles law
7.
Which of the following equations can be used to find a molecule's average kinetic energy, as per the Kinetic Molecular Theory?
1. $3/2(kT)$
2. $2/3(kT)$
3. $3kT$
4. $(kT)/2$

8.
Considering kinetic theory, what is the average kinetic energy of a gas at $25degC$? (Boltzmann constant is $1.381×10-23$.)

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