IdealGasLawSE.pdf - Name ElsaHammer Date Student...

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Name: Date: Student Exploration: Ideal Gas Law Vocabulary : atmosphere , Avogadro’s l aw, Boyle’s l aw, 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? Elsa Hammer
2. Why do you think it might be a bad idea to throw an aerosol can into a fire?
2019 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 chamber changes. Since gases expand to fill their container, any changes in the volume of the 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? What stays the same? 2. Using the purple slider on the tank of gas, adjust the number of moles , or amount of gas. What changes? What stays the same? 3. Now make Pressure the dependent variable. Use the red slider to change the temperature. What changes? What remains the same? Volume Temp Is gas amount volume Temp pressure Volume
Activity A: Volume relationships Get the Gizmo ready: x Select Volume as the dependent variable. x Set Pressure ( P ) to 1.0 atm, Moles ( n ) to 1.0, and 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? B. What do you think will happen to the space between molecules, and thus the volume of a gas, as it is heated? 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? . .
2019

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