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Gizmos Student Exploration: Ideal Gas Law Answer Key
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Gizmos Student Exploration: Ideal Gas Law Answer Key
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Name: Lee Arthur Date:Student Exploration: Ideal Gas Law
Directions: Follow the instructions to go through the simulation. Respond to the questions and prompts in the orange boxes.
Vocabulary: atmosphere, Avogadro’s law, Boyle’s law, Charles’s law, dependent variable, directly proportional, Gay-Lussac’s law,
ideal gas, ideal gas constant, ideal gas law, independent variable, inversely proportional, Kelvin temperature scale, kilopascal, mole,
pressure, proportionality, STP, volume
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. Why is it often necessary to add air to your car tires during the winter?
The colder temperatures effect the air in the tire they go flat faster so its in the
safer side to makek sure to get air put in them regularly.
2. Why do you think it might be a bad idea to throw an aerosol can into a fire?
The minute they hit too high temperatures such as fire the liquid turns to gas, which means they
become full of gas and it doesnt mix well with fire which could create an explosion
Gizmo Warm-up
The Ideal Gas Law Gizmo shows molecules moving within a chamber fitted with a movable
piston. As the piston moves up and down, the volume of the chamberchanges. Since gases expand
to fill their container, any changes in the volume ofthe chamber changes the volume of the gas
within.
1. Next to Dependent variable, check that Volume is selected. Using the green slider, change
the pressure. Note what happens to the temperature, volume,and amount of gas.
What changes? pressure What stays the same? the number of molecules and the moleshydrogen
and volume
2. Using the purple slider on the tank of gas, adjust the number of moles, or amount of gas.
What changes? volume What stays the same? pressure and temperature
3. Now make Pressure the dependent variable. Use the red slider to change the temperature.
What changes? volume What stays the same? temperature and moles hydrogen
, Activity A: Get the Gizmo ready:
● Select Volume as the dependent variable.
Volume
● Set Pressure (P) to 1.0 atm, Moles (n) to 1.0,and
relationships
Temperature (T) to 100 K.
Introduction: The dependent variable changes in response to a change in the independent variable in an experiment. Independent
variables are controlled by the experimenter and are manipulated to see what effect they might have on the dependent variable.
Question: What are some factors that affect the volume of a gas?
1. Investigate: In this Gizmo, all temperatures are measured using the Kelvin temperature scale. This scale is based directly on
molecular motion, with 0 K equal to –273 °C.
A. What do you think will happen to the speed of the molecules if a gas is heated?
they immediately start bouncing around much faster
B. What do you think will happen to the space between molecules, and thus the volume of a gas, as it is heated?
they are going to start dispersing so they have more room to maneuver
2. Analyze: Select the TABLE tab to see your data. With temperature set at 100 K, press Record. Increase the temperature in 50
K increments, pressing Record each time.
A. What trend do you see? the moles slowly start moving around faster
B. If the temperature of a gas is doubled, its volume will volume increases by 2x
C. If the temperature of a gas is halved, its volume will volume decreases by 2x
If two variables are directly proportional, an increase in the independent variable will cause the dependent variable to
increase at the same rate. If the variables are inversely proportional, anincrease in the independent variable will cause
the dependent variable to decrease at the same rate.
D. Select the GRAPH tab. Choose Temperature for the x-axis. A line with a positive slope shows that two variables are
directly proportional, while a curve with a negative slope reveals that two variables are inversely proportional.
Based on the graph, temperature and volume are directly proportional.
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