# Monday, Feb. 3 rd : “A” Day Tuesday, Feb. 4 th : “B” Day Agenda

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Monday, Feb. 3 rd : A Day Tuesday, Feb. 4 th : B Day Agenda. Homework Questions/Problems Sec. 12.3 Quiz Lab Write-up: Stoichiometry: Mass-Volume Mini-lab: How Much Gas is in a Bottle of Pop? Homework: Chemistry Gas Law Practice WS Chapter 12 Test/Concept Review Due: - PowerPoint PPT Presentation

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• Monday, Feb. 3rd: A DayTuesday, Feb. 4th: B DayAgendaHomework Questions/ProblemsSec. 12.3 QuizLab Write-up: Stoichiometry: Mass-VolumeMini-lab: How Much Gas is in a Bottle of Pop?Homework: Chemistry Gas Law Practice WSChapter 12 Test/Concept Review Due:A day: Tuesday, Feb. 11thB day: Wednesday, Feb. 12th

• Homework Questions Practice pg. 442: #1-3Sec. 12.3 review: pg. 442: #1-12

• Additional Practice #2Methane has a volume of 0.65 L when under 100 kPa of pressure at a temperature of 305 K. Using the balanced equation below, find the mass of oxygen that is needed to use up all of the methane. CH4 + 2 O2 CO2 + 2 H2OUse PV = nRT to find moles of methane(100 kPa) (0.65 L) = n (8.314) (305 K)n = .026 mol methane Use stoichiometry and molar mass to find mass of oxygen needed 1.66 g O2

• Sec 12.3 QuizMolecular Composition of GasesYou may use your book and your notes to complete the quiz on your own

May the force be with you!

• Lab: Stoichiometry: Mass-VolumeDiscussionA common way of collecting gaseous products is by water displacement.The reactants are placed in a closed reaction vessel with a gas delivery tube attached.The delivery tube passes through a pneumatic trough filled with water and under an inverted gas collection vessel that is filled with water.As the reaction proceeds, the gas leaves the reaction vessel and enters the collection vessel through the gas delivery tube, displacing the water.

• Lab: Stoichiometry: Mass-VolumeDiscussionThe volume of gas produced is equal to the volume of water displaced in the gas collection vessel.Since the gas is collected through water, the gas product is considered to be wet and this must be accounted for in calculations.Conditions in our lab must also be converted to STP conditions to find the volume of dry gas produced at STP.

• Lab:Stoichiometry: Mass-VolumePurposeIn this lab, you will be producing, capturing, and measuring the amount of CO2 gas produced by the decomposition of lead carbonate and comparing that to the theoretical yield using the following reaction: (PbCO3)2 Pb(OH)2 (s) 3 PbO(s) + 2 CO2 (g) + H20 (g)

• Based on the purpose of the lab, come up with a hypothesis.

Lab:Stoichiometry: Mass-VolumeHypothesis

• Lab:Stoichiometry: Mass-VolumeChanges to Materials ListAdd lead carbonate. (PbCO3)2 Pb(OH)2Cross out the size of the test tube (18 X 150 mm)Change thermometer to temperature probe.Cross out the barometer I will get the atmospheric pressure reading for that day online.

• LabStoichiometry: Mass-VolumeProcedure DiscussionPrepare the data table as instructed before step #1 in procedure today. Include UNITS!