Ch8_full_1005_F16 - Exam 2 is in ~10 days Exam 2 is on...

Exam 2 is in ~10 days
ü Exam 2 is on October 17 th (8:45 – 10:15 PM).
ü Exam 2 will include Chs 6-9. Plan accordingly!
o Start early on Ch9 (a lot of it may be familiar from high school).
o Fall 2015 lecture notes for Ch9 are available on ICON now.
o Complete homework assignments for Ch 8 and Ch 9 ASAP.
ü Read the announcements on ICON regularly.
ü Review sessions:
o Main doors to Chemistry building from Cleary walkway open at
2:15 PM on Sunday (10/16)
o Review Session 1- in W290 CB starting at 2:30PM
o Review 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 Modules à
Unit 2 à Exam Info tab.

Chemistry is like “IKEA”
h"p://
Product
Parts
Instructions

Balancing parts
1
+ 8
à
2
+ 4
à
1
+ 4
à
Will be able to make just 1 table .
Table top is the limiting part.
Too many legs!
Too many table tops!
Still will be able to make just 1 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 table
10 table tops : 40 legs : 10 tables

How much can we make?
Because chemical reactions do not make/destroy atoms but simply
re-combine them, knowing how much reagent is available dictates how
much product can be made.
parts = atoms = discrete pieces of matter
Consider a tool set that contains 5 wrenches, 4 screwdrivers, and 3
pairs 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 sets
2000 screwdrivers × (1 tool set/4 screwdrivers) = 500 tool sets
1000 p. of pliers × (1 tool set/3 p. of pliers) = 333 tool sets
Only 333 complete tool sets can be made limited by the
number of pairs of pliers .
600 > 500, so OK
500 = 500, OK

How much can we make?
Because chemical reactions do not make/destroy atoms but simply
re-combine them, knowing how much reagent is available dictates how
much product can be made.
parts = atoms = discrete pieces of matter