Exam 2 is in ~10 daysüExam 2 is on October 17th(8:45 – 10:15 PM).üExam 2 will include Chs 6-9. Plan accordingly!oStart early on Ch9 (a lot of it may be familiar from high school).oFall 2015 lecture notes for Ch9 are available on ICON now.oComplete homework assignments for Ch 8 and Ch 9 ASAP.üRead the announcements on ICON regularly.üReview sessions:oMain doors to Chemistry building from Cleary walkway open at2:15 PM on Sunday (10/16)oReview Session 1- in W290 CB starting at 2:30PMoReview Session 2- in Macbride auditorium starting at 6:30 PM.(doors unlock at 6:15PM)Class time on Monday, 10/17, is optional and will be used for a questions/answer session.Old exam and video walk-thru are available on ICON in ModulesàUnit 2àExam Info tab.
Chemistry is like “IKEA”h"p://ProductPartsInstructions
Balancing parts1+ 8à2+ 4à1+ 4àWill be able to make just1 table.Table top is the limiting part.Too many legs!Too many table tops!Still will be able to make just1 table.Legs are the limiting part.Just right! (like in a balanced chemical equation)No parts left, a table completed.1 table top : 4 legs :1 table10 table tops : 40 legs : 10 tables
How much can we make?Because chemical reactions do not make/destroy atoms but simplyre-combinethem, knowing how much reagent is available dictates howmuch product can be made.parts = atoms = discrete pieces of matterConsider a tool set that contains 5 wrenches, 4 screwdrivers, and 3pairs of pliers. The manufacturer has 3000 wrenches, 2000 screwdrivers,and 1000 pairs of pliers in the warehouse.Can the order of 500 tool sets be filled?Will there be any leftovers (aka extra tools)? Think about it.3000 wrenches×(1 tool set/5 wrenches) = 600 tool sets2000 screwdrivers×(1 tool set/4 screwdrivers) = 500 tool sets1000 p. of pliers×(1 tool set/3 p. of pliers) =333 tool setsOnly 333 complete tool sets can be made limited by thenumber of pairs of pliers.600 > 500, so OK500 = 500, OK
How much can we make?Because chemical reactions do not make/destroy atoms but simplyre-combinethem, knowing how much reagent is available dictates howmuch product can be made.parts = atoms = discrete pieces of matter