# Equilibrium 2 Reagan 2.pdf - Name Reagan Allen Date Student...

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Name: Reagan Allen Date: 11/24/19 Student Exploration: Equilibrium and Pressure[Note to teachers and students: This Gizmo™ was designed as a follow-up to the Equilibrium and ConcentrationGizmo. We recommend doing that activity before trying this one.]Vocabulary:Dalton’s law, Le Châtelier’s principle, partial pressure, pressure Prior Knowledge Questions (Do these BEFORE using the Gizmo.) A typical scuba tank has a volume of 11 liters and can support a diver for one hour. An adult breathes about 3 liters of air with each breath. 1.How can an 11-liter tank give a diver enough oxygen for one hour? ________
2.Why are diving cylinders made of thick, reinforced aluminum or steel?
Gizmo Warm-upGases consist of billions of tiny particles in constant motion, colliding with each other and the walls of the container. The sum of all these collisions creates pressureon the walls of the container. In theory, any amount of gas can be squeezed into a container if the container is strong enough to withstand the gas pressure. The Equilibrium and Pressure Gizmo shows a mixture of gases in a chamber. The lid of the chamber can move up or down.1.Check that Reaction 1is selected. Use the Moles NO2slider to increase the number of NOmolecules in the chamber. How does this affect the volume of the chamber? 2
2.Notice the weights on the lower right side of the Gizmo. Drag several of these weights to the lid. How does this affect the volume of the chamber?
Activity A: Dalton’s lawGet the Gizmo ready: Remove all weights from the lid. Set Moles NO2and Moles N2O4to 0. Introduction: In a mixture of gases, each gas contributes a partial pressureto the total pressure in the chamber. Because the chamber has a moveable piston, the pressure inside is equal to the pressure on the lid. In this Gizmo, the units of pressure are megapascals (MPa). Question: How do individual gases contribute to the total pressure in a chamber?