WELCOME! Who: You and Me (Mike Payne) What: Chemistry 305 (Intro to Chemistry) When: WAY TOO EARLY Tuesdays and Thursdays Where: Here Why: …

A little more about me

A little more about you…

Syllabus

A few… cautions STUDY!!! Tardiness Cell phones, PDAs, MP3s, technology in general Follow along in class Ask questions!!! Respect for your fellow students Make mistakes Learn your nomenclature! Do the homework/reading

Some comments from past students… “Give more time to take the test or make it easier to finish on time.” “Tests are too long” “Tests are too long!” “The tests were too long. Most of the time, not even half of the class was able to finish” “…gave a TON of work in the class. Took too much time to do it all”

Some comments from past students… “The homework was too long and is not worth a lot of points. Also, the tests are too long…” “The exams are a little too long and I often felt rushed and made careless errors due to the length of the exams” “I felt like I spent too much time doing homework and not studying for the tests. I was overwhelmed by the amount of homework, quizzes and test and I never felt I had enough time to do tests”

Some more comments from past students… “…it was easy to reach him. He was always willing to give us extra help on the subject.” “He created an environment for learning versus just a lecture…” “…tries his best to help everyone understand the material, and even goes the extra length to meet on his own time.” “…went above and beyond to help his students learn chemistry.” I appreciate the extra work Mike put in for the class. It’s nice to have an instructor that wants all of the students to pass and learn the material.”

Some more comments from past students… “…and cares if his students do well. Mike is always available for help.” “Just the right amount of work was given out and the tests were not too long” “The instructor was very concerned with making sure that everyone knows what to do…” “He always encourages students to ask him questions… He helps outside of class giving extra materials to work on out of his time.” My personal favorite… “I hate chemistry, but this semester actually didn’t suck!”

HOMEWORK: Read for THURSDAY: Course Website: Coming Soon Chapter 1: All Chapter 2: sections 1, 2, 3, 4, 5 Course Website: Coming Soon

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Uncertainty All about uncertainty ALL measurements have some uncertainty between 11.5 and 12 cm about 11.83 cm about 11.7 or 11.8 cm

Uncertainty Time’s up!! 5:02 5:01 5:00

Uncertainty All about uncertainty ALL measurements have some uncertainty about 11.8 cm

Uncertainty All about uncertainty ALL measurements have some uncertainty

Uncertainty Exact numbers: Examples: 1 foot = 1 kilometer = 1 mile = 24 hours = Have NO uncertainty because these numbers are DEFINED Will never affect “significant figures”

Uncertainty Counted numbers: Examples Also have no uncertainty I have 11 fingers there are 11 dogs Also have no uncertainty Will never affect “significant figures”

Uncertainty Measured number ALWAYS have some uncertainty to them Examples I live 6 and a half miles away I drink 1.5 liters of water a day This bench is… ALWAYS have some uncertainty to them Will always affect “significant figures”

Uncertainty and Measurements State the digits you can be sure of! Guess the next digit! (and only the next digit) I KNOW it is between 11 cm and 12 cm measurement: 11.8 cm graduations (marks): 1 cm uncertainty: ± 0.1 cm

Uncertainty and Measurements State the digits you can be sure of! Guess the next digit! (and only the next digit) I KNOW it is between 11.8 cm and 11.9 cm measurement: 11.84 cm graduations (marks): 0.1 cm uncertainty: ± 0.01 cm

Uncertainty and Measurements State the digits you can be sure of! Guess the next digit! (and only the next digit) between 500 cm and 600 cm measurement: 520 cm graduations (marks): 100 cm uncertainty: ± 10 cm

Uncertainty and Measurements If your instrument has an uncertainty of ± 0.01 mL, your measurement will end with .00 .01 .02 .03 .04 .05 .06 .07 .08 or .09 If your instrument has an uncertainty of ± 0.2 g, your measurement will end with .0 .2 .4 .6, or .8 If your instrument has an uncertainty of ± 0.005 cm, your measurement will end with .000 or .005

Uncertainty and Measurements Which of the following would be correct if measured on the ruler below? assume ± 0.1 cm uncertainty a) 1.0 cm b) 1.50 cm c) 1.55 cm d) 1.6 cm e) 2.00 cm

Uncertainty and Measurements Which of the following would be correct if measured on the ruler below? (This ruler has an uncertainty of ± 0.05 cm) a) 0.5 cm b) 0.50 cm c) 0.055 cm d) 0.75 cm e) 0.100 cm

11.84 cm Significant Figures 4 significant figures Significant figures tell you about the uncertainty in a measurement. Significant figures include all CERTAIN (known) digits, and ONE UNCERTAIN (guessed) digit 11.84 cm 4 significant figures

520 cm Significant Figures 2 significant figures Significant figures include all CERTAIN (known) digits, and ONE UNCERTAIN (guessed) digit 520 cm 2 significant figures

How many Sig. Figs.? Two rules: #1) If there IS a decimal point in the number: Start at right of number and count until the LAST non-zero digit

2 3 . 2 8 1 . 6 8 1 . How many Sig. Figs.? 9 significant figures 2 8 1 9 significant figures . 6 8 4 significant figures 1 . 6 significant figures