advertisement

Gas Laws Lesson 6 11.15 & 16 Chemistry Boon Objective Catalyst I can state Avogadro’s Law and the combined gas law and use them to solve gas law problems. What gas law was demonstrated by the can crush demonstration? Why? What gas law was Agenda Catalyst The Combined Gas Law Avogadro’s Law Gas Law Poster Project Exit Slip = Complete Poster demonstrated by the marshmallow video? Why? Gas Laws Mini-Review Gay-Lussac’s Law: At constant volume, pressure and temperature are ____________ proportional. directly For example, as pressure increases, temperature _________. increases Charles’s Law: At constant pressure, volume and temperature are ____________ proportional. For directly example, as volume increases, temperature _________. increases Boyle’s Law: At constant temperature, volume and pressure are _______________ proportional. For inversely example, as volume increases, pressure ___________________. decreases https://www.youtube.com/watch?v=Mytvt0wlZK8&feature=related The Combined Gas Law The combined gas law combines Gay-Lussac’s Law, Charles’s Law, and Boyle’s Law into one. If you are given any five of the variables, you can solve for the sixth. Think, Pair, Share: Why do we need the combined law? What new situation does it address? Example 1: P1=300 torr, P2=900 torr, V1=40 L, V2= 10 L, T1=250 K T2=??? Example 2: A cheetohs bag is sitting in a car at STP and has a volume of .5 L. Then, the car is heated to 27 °C. The pressure increases to 1.2 atm. What is the bag’s new volume? Example 3: If a gas at 6 L and 30 torr is compressed to a pressure of 600 torr, what is the new volume of gas? Avogadro’s Law https://www.youtube.com/watch?v=GlZ5wxejWy8&feature=endscreen In 1811, Italian scientist Amadeo Avogadro found that equal volumes of all gases, under the same conditions, have the same number of particles. Specifically, at standard temperature and pressure, one mole of any gas has a volume of 22.4 L. Avogadro’s Law Avogadro’s law means that gas volume is directly proportional to the number of moles of gas at the same temperature and pressure. Example 1: V1 = 22.4 L, n1 = 1 mol, V2 = ___ , n2 = 5 mol Example 2: What is the volume of 10 mol of nitrogen gas at STP? Example 3: 6 mol of ammonia gas has a volume of 120 L. At the same temperature and pressure, what is the volume of 18 mol of ammonia? Gas Law Poster Due at end of class Poster must contain: Name of gas law Definition Graph Equation Example problem Answer the example problem on the back of your poster.