2 Schedule for Week M – define terms/Presentation Sign-up T – Boyles Law LabW – Lab DiscussionR – Charles Law LabF – Quiz or Presentation
3 Key terms - Define Kinetic Theory Standard Conditions Pressure TemperatureFahrenheitCelsiusKelvinBoyles LawCharles LawDalton's LawIdeal Gas/ Ideal Gas Law
4 Boyles Law lab Equation Variables Constants Artfully construct tool Gather spectacular data, graph with excel, answer questionsTreat books respectfully
5 Wed-ThurWork on completing Boyles law lab – mail or print out lab and turn in.Begin Charles law lab..ask questions – Due Friday..Assign for Thur 2/9Text, Page, Questions; 14-15Assign for Fri 2/10Text, Page 436, Questions; 9-10
6 Question Before LabA balloon is filled with lung gas to a volume of 2.00 liters (lung temp = body temp). The balloon is placed in a kitchen-aide freezer and assumes a new volume of 2500 ml. What is the temperature of the freezer? Would you keep your meet in this freezer?
7 AChem Friday Part 1 – Either Quiz up front Part 2 – Presentation Or Quiet Presentation prep in backPart 2 – PresentationState which law likely explains phenomenon demonstratedObservers, be respectful and appreciative!Part 3 – Homework for weekendOnline quiz – Boyles and Charles Law Calcs.Note – MondayWe will finish data collection for labs
8 Quiz1)A Marshmellow at sea level has a volume of 55 ml (STP). Suppose someone put the marshmellow in their pocket and jumps on a plane. At altitude the cabin pressure is 625 mm Hg. Determine the volume of the marshmellow..2) Is a thermometer based on Boyle’s or Charles law? Explain..
9 Practice 1A balloon having a volume of 1.5 l, is taken from room temperature and placed in a freezer with temperature of -20 C. The balloon now has a volume of .65 l. Calculate the temperature of the room.Law:Equation:
10 Practice 2A balloon having a volume of 25 ml, is taken from room temperature (295 K)and placed in a freezer with temperature of -20 C. Calculate the volume of the balloon.Law:Equation:
11 Practice 3A sealed syringe with volume of 75 ml is placed in a vacuum chamber. Air is “sucked” out until the pressure is 125 mm Hg and the syringe has a volume of 15 torr. Determine the pressure while the syringe was sealed.Law:Equation:
12 Practice 4A marshmallow at STP has an unknown volume. The mallow is placed in a microwave and heated to 75 C, bloating to a megamallow volume of .85 l. Determine the initial volume of the (mini)malloLaw:Equation:
15 Puvnert (PV=nRT)Ideal Gas LawIdeal Gas??When to UseExamples
16 0.08206 Realize: Ideal gas constant units are liters, ATM, moles, kelvin !!!!!!!!
17 Example;A balloon contains 2.50 l of ethyne gas at a pressure of 1.75 ATM and a temperature of 321 K. Determine how many moles of gas are contained in the balloon molesHow many grams of ethylene?4.32
18 Example;Say we have the same balloon, this time, we know there are 15 grams of ethyne, the temperature is 25.0 C, and the volume is 1250 ml, determine the pressure of the balloon.
19 OK, make up your own exciting balloon problem and hand in.
20 Monday – Another Law and stoichwgas… Dalton’s Law of partial Pressure
22 Ptot=P1+P2+P3… Dalton’s Law of partial Pressure When to use; Example: Calculate the partial pressures of oxygen (21%), nitrogen (78%) and carbon(~1%) dioxide in air if air pressure = check the hallway (field trip)
23 Chapter 13 – Final Topic Gas stoichiometry Real life chemistry Combines stoichiometry from ch 9 with ideal gas law from ch 13Examples:
24 Example #1 10.0g HCl, with excess aluminum. Determine the volume of gas produced (assuming STP)…3.07
25 Example #2 10.0g HCl, with excess aluminum. Determine the volume of gas produced (At typical lab conditions T=22.0 C, P=0.985 ATM)…
26 Example #3If 2.00 liters of methane are to be burned, determine the volume of oxygen required (assuming STP).
27 Example #45.00 liters of propane are reacted with 5.00 liters of oxygen. Determine the volume of Carbon dioxide produced (Check across hall for current conditions)
28 Thrstdy Make sure gas stoichiometry lab ready to hand in Fri. Think about barometer for < $1Demonstration QuestionDraw a diagram illustrating your answer…