welcome to chemistry 102 - university of...
TRANSCRIPT
Welcome to Chemistry 102
Who, What and Where?
• Instructor: • Office and Office Hours
• Email:
What Do You Need?
• Textbook
– Chemistry, Zumdahl, 9th Ed.
• iClicker
– To register, go to iclicker.illinois.edu
– Follow the instruction
– Use your netID
Where Can I Find Things?
• For course policy, lecture schedules,
• Our course website
• http://www.chem.illinois.edu
• For online homework and
online quizzes – LON-CAPA
• See also FAQs section in the course policy
Grading Guidelines
Online Homework (LON-CAPA) 75
Clicker Points (in class) 25
Quizzes (LON-CAPA - 100 pts and
discussion – 50 pts) 150
Hourly Exams (150 pts each x 3) 450
Final Exam 300
Total 1000
A = 900 – 1000
B = 800 – 899
C = 700 – 799
D = 600 – 699
F = < 599
Hourly Exams and Final
Hourly Exams (7:00 – 8:15 pm, location TBA)
• 1st – Tuesday, 9/24
• 2nd – Thursday, 10/24
• 3rd – Thursday, 11/21
Final Exam
• There will be NO MAKEUP
exams or final
Discussion Section
• Purpose of discussion
– reinforce lecture material, develop problem solving skills
– TA’s role – to help and facilitate the learning process
– DO NOT ask your TA to just give you the answer!
• Can access the weekly worksheet on Lon-CAPA
• Purpose of lecture
– Review material,
– learn new concepts, and
– provide explanation
Don’t Despair!!
• There is help available – Instructor
– Chemistry Learning Center
– TAs
Some Word of Advice
• Learning chemistry is not a “spectator” sport!
• Practice, Practice, Practice
• Do something everyday
• Quality study time
Measurement Basics
• Unit of Measurement – SI (Systeme International)
Mass kilogram kg Length meter m Time second s Temperature kelvin k Elect Current ampere A Amt of sub. mole mol Luminous int. candela cd
Uncertainty and Significant Figures
• Why worry about sig figs
– Gives us the uncertainty of your measurement
Precision vs. Accuracy
Uncertainty and Significant Figures
• Sig figs rules – Nonzero integers always count as sig figs.
– Zeros
1. Leading zeros (zeros that precede the nonzero digits) do not count as sig figs
2. Captive zeros (zero btw nonzero digits), these count as significant zeros
3. Trailing zeros (zero at the right end of the number), only counts if there is a decimal.
Exact numbers - infinite # of sig figs
Significant Figures in Math Operations
• Addition and subtraction
• Multiplication and division
Significant Figures (cont’d)
• What about mixed operations?
Unit Conversions
Mass
Length
Temperature
Unit Conversions Example
You need to build a square vessel to contain 5.00 gallons of water, what would the dimensions of the square container in centimeters? In meters?
Density
If you have 100. ml of each three liquid,
Which one would be the lightest?
(= mass/volume)
Ethanol (100%) = 0.789 g/mL
mercury = 13.6 g/mL 1.00 g/mL
For Discussion on Wed. 8/28/13
• Worksheet #1
• Review Sig Fig Rules
• Brush up on unit conversion, density calculations