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GAS VARIABLES POGIL Proportionality Directly Proportional As one increases, so does the other =∗ Inversely Proportional As one increases, the other decreases = Thermodynamic Observables Aspects of a system that we can observe, measure, or calculate in some way. Pressure – P kilopascals (kPa) Temperature – T Kelvin (K) Volume – V Liters (L) moles – n (number of molecules) moles Gas Variables POGIL Stop After Question 11 Bell: 1/14 Warm-up Answer Week # 2 at the front on bell sheet Objective: I can describe how the gas variables relate to one another. Announcements SAGE interim testing All next week Bring Head Phones Review: Question 3 Which gas variables is most closely related to the length of arrows in model 1? Review: Question 6 Two factors that influence the pressure of a gas: 1: 2: How do these effect the pressure of a gas? Review: Question 11 Experiment A (Adding More Gas) Direct or Inverse? Algebraic Expression Experiment B (Heating the Gas) Gas Variables POGIL Stop after Question 16 Question 12b What is always true for the external and internal pressure of a gas in a flexible container? Question 16 Provide a molecular level explanation for the increase in volume among the balloons in experiment E. Gas Variables POGIL Stop after Question 21 Key Concept: Question 20 Experiment C Experiment D (Adding More Gas) (Heating the Gas) Direct or Inverse? Algebraic Expression Experiment E (Reducing the external pressure) Gas Laws Boyle’s Law Charles’ Law Gay-Lussac’s Law Avagadro’s Law = = = = Combined Gas Law: = Quick Quiz A gas is kept in a non-flexible container. What would happen to the gases pressure if the volume of the container is decreased? What would happen to the gases temperature if the pressure were to be increased? Using the Gas Laws Combined Gas Law: = Step 1: List all knowns and unknowns Step 2: make two combined gas laws Step 3: make the two gas laws equal Step 4: Plug and Chug Example: A gas in a 500 ml non-flexible container is heated from a temperature of 20 K to a temperature of 30 K. If the pressure of the gas was originally 50 kPa, what is the new pressure of the gas? Step 1: List knowns and unknowns Step 2: make two combined gas laws Step 3: make the two gas laws equal Step 4: Plug and Chug Example: A gas in a non-flexible container with a volume of 1 L is cooled from a temperature of 50 K to a temperature of 45 K. What is the new volume of the gas? Step 1: List knowns and unknowns Step 2: make two combined gas laws Step 3: make the two gas laws equal Step 4: Plug and Chug Gas Laws Worksheet Due Friday