Heat of Fusion and Heat of Vaporization
Using Q=S*m*ΔT and Phase Changes
This is a little more advanced than you need--we will not be using the specific heat of ice or water vapor--but it is a good example of a combined problem.
Wednesday, February 28, 2018
Phase Changes
Hi there class! Good job on the exams. Here are a couple videos to help with phase change calculations.
Heat of Fusion and Heat of Vaporization
Using Q=S*m*ΔT and Phase Changes
This is a little more advanced than you need--we will not be using the specific heat of ice or water vapor--but it is a good example of a combined problem.
Heat of Fusion and Heat of Vaporization
Using Q=S*m*ΔT and Phase Changes
This is a little more advanced than you need--we will not be using the specific heat of ice or water vapor--but it is a good example of a combined problem.
Thursday, February 22, 2018
Kinetic Molecular Theory Essay
Students,
For this essay, I want you to write 3-4 paragraphs on the kinetic molecular theory (KMT). The essay should include the five postulates of the KMT and at least two implications of the kinetic theory--the implications must have detailed explanations. You can find an example essay and the rubric for the assignment below. The essay must be TYPED.
For this essay, I want you to write 3-4 paragraphs on the kinetic molecular theory (KMT). The essay should include the five postulates of the KMT and at least two implications of the kinetic theory--the implications must have detailed explanations. You can find an example essay and the rubric for the assignment below. The essay must be TYPED.
The
Kinetic Molecular Theory Essay Example
The
kinetic molecular theory is a model that helps explain the behavior of an ideal
gas. The model includes the following five postulates:
1.
Gases
consist of tiny particles (atoms and molecules).
2.
These
particles are so small, compared with the distances between them, that the
volume (size) of the individual particles can be assumed to be negligible
(zero).
3.
The
particles are in constant random motion, colliding with the walls of the
container. These collisions with the walls cause the pressure exerted by the
gas.
4.
The
particles are assumed not to attract or to repel each other.
5.
The
average kinetic energy of the gas particles is directly proportional to the
Kelvin temperature of gases.
As one studies the above postulates, a
qualitative understanding of the relationship between the kinetic molecular
theory and the properties of gas can be formed. It is first important to
understand the relationship between the kinetic energy of gas molecules and the
temperature of a gas. The higher the kinetic energy—on average—of individual
gas particles, the higher the temperature of that gas. Thus, it can be seen
that the temperature of a gas, in Kelvin, is directly proportional to the
average kinetic energy of the gas particles. Based on the relationship of the
kinetic energy of individual gas particles and the temperature of a gas, the
kinetic molecular theory can help explain the relationship between gas
properties.
According to Gay-Lussac’s law, the
pressure of gas is directly proportional to the temperature of a gas in Kelvin.
This is due to the fact that as temperature increases, the average kinetic
energy of individual gas particles also increases. Thus, there is an increase
in particle movement, which causes more collisions of the gas particles with
the wall of its container—which increases the pressure the gas exerts.
According to Charles’ law, the volume
of a gas is directly proportional to the temperature of a gas in Kelvin. It is
important to note, though, that this is only true when the volume of the gas
container is not fixed (rigid container)—such as a balloon. As the temperature
of a gas increases, the average kinetic energy of individual gas particles also
increases. This increase in kinetic energy cause more movement in the gas
particles, which causes more collisions with the container wall—in turn, the
pressure exerted by the gas increases. As a result, the non-rigid container
expands and allows the volume of the gas to increase.
RUBRIC
| CATEGORY | 4 | 3 | 2 | 1 |
| Included Information | Essay includes all five postulates of the kinetic molecular theory and at least two implications of the kinetic molecular theory. | Essay includes at least four postulates of the kinetic molecular theory and at least two implications of the kinetic molecular theory. | Essay includes at least four postulates of the kinetic molecular theory and at least one implication of the kinetic molecular theory. | Essay includes at least four postulates of the kinetic molecular theory and includes no implications of the kinetic molecular theory. |
| Information Quality | The two implications of the kinetic molecular theory are accurately explained. | The two implications of the kinetic molecular theory are somewhat accurately explained. | The two implications of the kinetic molecular theory are inaccurately explained. | The two implications of the kinetic molecular theory are not explained. |
| Essay Structure and Grammar | The essay has fewer than 3 grammatical errors and is well structured. | The essay has fewer than 5 grammatical errors and is fairly well structured. | The essay has fewer than 8 grammatical errors and has some structure issues. | The essay has fewer than 10 grammatical errors and is not well structured. |
Wednesday, February 21, 2018
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