Exam (elaborations) Student Exploration Ideal Gas Law

Student Exploration: Ideal Gas Law 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.) 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 it’s on the safer side to make sure to get air put in them regularly. 1. 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. This means they become full of gas, gas and fire don’t mix well together and this thus could create an explosion of sorts. 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? The pressure, and the volume becomes more condensed. What stays the same? The number of molecules and the moles hydrogen 2. Using the purple slider on the tank of gas, adjust the number of moles, or amount of gas. What changes? Volume