Do Now Date: February 29, 2016 Obj: Describe and predict the relationship b/t P, T, and V with the combined gas law. Solve: A gas at STP occupies 28 ml of space. If the pressure changes to 3.8 atm and the temperature increases to 203 o C, find the new volume. STP = Standard Temperature (0 o C or 273 K) and Pressure (1 atm).
Monday, February 29, 2016 Today: Warm-Up, Demo: Can Crush, Activity: Kinetic Molecular Theory, Intro to PV=nRT HW: p 440, #67, 68, 72 -- Paraphrase questions and answer. Final Boyle s Law lab Due Thursday.
Warm-Up: Image from http://www.hammockhouse.com/images/campfire.jpg
Warm-Up: Image from http://image52.webshots.com/152/0/0/93/416300093xefhds_fs.jpg
Warm-Up: Image from http://images.google.com/imgres?imgurl=http://farm4.static.flickr.com/3305/3191659387_5eb20b768a.jpg&imgrefurl=http://letsgetsconed.blogspot.com/2009/01/angel-foodmarshmallow-making.html&usg= ltlwekvnde3sxmfuwb8bmnntoo=&h=375&w=500&sz=92&hl=en&start=45&sig2=eueuy3x7wytpw7a0zhtbzw&tbnid=jpphjxzirdivpm:&tbnh=98&tbnw=130&ei=_rwhsbgya9xkmqfmmmsadq&prev=/images%
From http://homecooking.about.com/od/candyrecipes/r/bldes60.htm Marshmallow Recipe Vegetable shortening for the pan 1 cup cold water 3 tablespoons unflavored gelatin 2 cups granulated sugar ¾ cup light corn syrup ¼ teaspoon salt 1-½ teaspoons vanilla extract
Kinetic Theory Three basic assumptions about gasses: A gas is composed of tiny particles (atoms or molecules). These particles are in constant random motion. Their collisions are perfectly elastic. These assumptions are the basis for our understanding of the behavior of gasses.
Demo: Can Crush Why do I heat the water? What happens to the water molecules? What happens to the molecules when I quickly cool the can?
Activity: Kinetic Molecular Theory Based on our diagrams on the board, write a paragraph describing why the can crushed. Key terms to include: Kinetic Molecular Theory (see your notes!) Atmospheric Pressure, Temperature, Steam, Condensation, Volume
Big Ideas Gas Laws Remember kinetic theory! Gas pressure is created when molecules gain energy or have less space in which to move. Gas molecules constantly and randomly move independently of each other and are mostly far apart.
Ideal Gas Law: Intro If I have 7.7 moles of gas at a pressure of 0.09 atm and at a temperature of 56 0 C, what is the volume of the container that the gas is in? PV=nRT n=moles R= 0.0820 (L atm)/( K mol)
Ideal Gas Law: Intro If I have 2.1 moles of gas at a pressure of 2.7 atm, and the volume is 200 ml, what is the temperature of the gas? Remember, 1 L = 1000 ml PV=nRT n=moles R= 0.0820 (L atm)/( K mol)
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Do Now Date: March 1, 2016 Obj: Describe and predict the relationship b/t P, T, and V with the combined gas law. Copy and solve: If I have 4 moles of a gas at a pressure of 5.6 atm and a volume of 12 liters, what is the temperature? PV=nRT n=moles R= 0.0820 (L atm)/( K mol)
Tuesday, March 1, 2016 Today: W-Up, Lab: Boyle s Law with Tech HW: Finish Boyle s Law lab write-up (be sure to look at Breslyn.org and the documents from class)!
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Do Now Date: March 2, 2016 Obj: Describe and predict the relationship b/t P, T, and V with the combined gas law. Copy and solve: If I have 4 moles of a gas at a pressure of 5.6 atm and a volume of 12 liters, what is the temperature? PV=nRT n=moles R= 0.0820 (L atm)/( K mol)
Wednesday, March 2, 2016 Today: W-Up, Notes & Practice, Demo: Vacuum Pump, Practice PV=nRT HW: Finish Boyle s Law lab write-up (be sure to look at Breslyn.org and the documents from class)! Final Draft Due Tomorrow!
Demo: What is happen kinetically? What caused the can to collapse according to Kinetic Theory? Can Crush
Big Can Crush http://www.youtube.com/watch?v=p4lr z-1lamy&feature=related List three important things that you noticed in the online demonstration.
Kinetic Theory Page 237-238 in your book. Three basic assumptions about gasses: A gas is composed of tiny particles (atoms or molecules). These particles are in constant random motion. Their collisions are perfectly elastic. These assumptions are the basis for our understanding of the behavior of gasses.
Safety Tip Teenager, Aiden Kelly who got caught in in a fireball after a friend stupidly threw an aerosol can on a campfire, has regrown his skin without any scarring. The 40 year mother of two said: After it happened it looked like all his flesh was falling off. It was absolutely horrendous, he didn t have any skin left on his nose.
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Do Now Date: March 3, 2016 Obj: Describe and predict the relationship b/t P, T, and V with the combined gas law. Copy and Solve: If you have an initial pressure of 10 atm and a volume of 20 L, what will the final volume be at a pressure of 20 atm?
Thursday, March 3, 2016 Today: W-Up, Practice: Gas Laws, Activity: Can Crush HW: p 439 #48, 55, 56 (convert g to mol to solve) Paraphrase questions and answer. Quiz Friday! Unit Test Next Thursday!
Can Crush Safety Caution around Bunsen Burner (hair, cloths, paper, etc.) Remove flammable materials from desk! Tongs are still hot!!!
Air Pressure
Air Pressure
http://www.youtube.com/watch?v=hsdc9gx1by0& feature=related Remember, atmospheric pressure is strong! http://www.youtube.com/watch?v=uy- SN5j1ogk&feature=related Just one more --- http://www.youtube.com/watch?v=e_hci9vrvfw An alternate explanation:
Kinetic Theory Page 237-238 in your book. Three basic assumptions about gasses: A gas is composed of tiny particles (atoms or molecules). These particles are in constant random motion. Their collisions are perfectly elastic. These assumptions are the basis for our understanding of the behavior of gasses.
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Do Now Date: March 4, 2016 Obj: Describe and predict the relationship b/t P, T, and V with the combined gas law. Copy and Solve: If I have 7.2 moles of gas at a pressure of 1.1 atm and at a temperature of 0 0 C, what is the volume of the container that the gas is in?
Friday, March 4, 2016 Today: W-Up, Practice Ideal Gas Law, Quiz HW: Study for Unit Test Next Thursday.
Solve 1. If I have 17 moles of gas at a temperature of 67 0 C, and a volume of 88.89 liters, what is the pressure of the gas? 2. My car has an internal volume of 2600 liters. If the sun heats my car from a temperature of 20 0 C to a temperature of 55 0 C, what will the pressure inside my car be? Assume the pressure was initially 760 mm Hg.
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Wrap-Up: Describe the motion of atoms or molecules in a gas. What effect does temperature have on these particles (the atoms or molecules)? Include diagrams to support your explanation.
Warm-Up Use kinetic theory to explain why the volume of a balloon decreases when liquid nitrogen is poured over it. Image from http://www.physics.umd.edu/lecdem/services/demos/demosi4/i4-17.htm