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Chem 106: Class/ Lab Week 3 Sign in: Roster @ front of lab
Missing Assignments If there is an * next to your name you are missing 1 or more assignments See Dr. R. during lab if you are unsure of what is missing. Missing Assignments will be accepted and checked off if submiAed and received by Dr. R. no later than noon Friday. None of these will be accepted aJer that Kme. If there are ** you have not answered the course survey and have not provided an e-­‐mail address: Send an e-­‐mail as soon as possible to: [email protected] Be sure to click any link saying “QuesKons” in course calendar Provide all informaKon and answers Be sure to hit submit at the boAom of each form Take out your i-­‐clicker and turn it on Chem 106: Class/ Lab Week 3 Class Survey Results 2016 Rank 2017 Rank 1 1 1 1 1 C. Climate Change T. Social InjusKce M. Jobs F. DepleKon of Natural Resources H. EducaKonal OpportuniKes J. Environmental PolluKon K. Health Care 4 5 QUESTION
3 3 3 Look for your name on the screen as the roster scrolls through, if it appears you are not registered, then: 1.  Click the i-­‐clicker leAer next to your name when your name appears 2.  Another leAer will appear following your entry; click it You’re i-­‐clicker should be registered (Your name disappears); this process will not need to be repeated. Bring the i-­‐clicker to every class/
lab meeKng for credit Answer
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Fundamental Measurements Pre-­‐lab Part 1: Mass/ Volume/ Temperature Chem 106: Class/ Lab Week 3 Correct Measurements: WriAen Numbers & Units Significant Figures 52.6 mL
Sig fig?
39.05 mL
Sig fig?
3
4
4.30 cm
Sig fig?
3
13.0 oC
Sig fig?
0.0430 m
Sig fig?
3
3
QUESTION
Which one of the following does NOT represent four significant digits?
A. 
B. 
C. 
D. 
0.07100 mg
0.7100 mg
0.7010 mg
0.0710 mg
Answer
Which one of the following does NOT represent four significant digits?
A. 
B. 
C. 
D. 
0.07100 mg
0.7100 mg
0.7010 mg
0.0710 mg
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QUESTION
Chem 106: Class/ Lab Answer
Fundamental Measurements Pre-­‐lab Part 1: Mass/ Volume/ Temperature Week 3 Correct Measurements: WriAen Numbers & Units Scien>fic Nota>on 52.6 mL
Sci. Not.?
5.26 x 101 mL
4.30 cm
Sci. Not.?
4.30 cm
0.0430 m
Sci. Not.?
4.30 x 10-1 m
ScienKfic NotaKon Chem 106: Class/ Lab Week 3 Correct Measurements: WriAen Numbers & Units Significant Figures & Scien>fic Nota>on CalculaKons Percent & Ra>o Comparisons 3
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QUESTION Answer = (25%/ 5%) x 1053
QUESTION
Answer
= ? hrs
12 hrs
= ? hrs
= 0.000000211 hrs → ? sec
Answer
Chem 106: Class/ Lab Week 3 Correct Measurements: WriAen Numbers & Units Significant Figures & Scien>fic Nota>on CalculaKons Percent & Ra>o Comparisons Conversions Ra>o Comparisons 0.000000211 hr x 60 min/hr x 60 sec/min = ? sec
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QUESTION
Answer
Worksheet ApplicaKons Worksheet ApplicaKons Chem 106 Lab: Week 3
Chem 106 Lab: Week 3 & Week 4
Using the corrected Fundamental Measurements Pre-­‐lab pg. 5 key as a foundaKon Complete the boiling point determinaKon & liquid’s mass & volume (Course/ Lab Manual pp. 7-­‐8). Turn in the iniKaled copy of pp. 7-­‐8 @ the end of today’s lab. 5
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Chem 106 Lab
Worksheet: Due next Lab Work CollaboraKvely: Turn in Individually Consult with your Lab partner and any other Lab group with the opposite numbered unknown: odd vs. even; answer the 5 bulleted quesKons. Put your names on page #12 and have stamped by Dr. R. before leaving lab. Write your name, then list the name(s) in parentheses of anyone who you worked with in doing the worksheet QUESTION
Chem 106: Class/ Lab Test Yourself Correct Measurements: WriAen Numbers & Units Significant Figures & Scien>fic Nota>on Coincidentally, a U.S. nickel has a mass of approximately 5 grams. If you had one
dollar’s worth of nickels in your jean’s what would be the mass of the nickels in
milligrams?
A. 
B. 
C. 
D. 
100 milligrams
50 milligrams
1,000 milligrams
100,000 milligrams
CalculaKons Percent & Ra>o Comparisons Conversions Ra>o Comparisons Answer
Answer
Coincidentally, a U.S. nickel has a mass of approximately 5 grams. If you had one
dollar’s worth of nickels in your jean’s what would be the mass of the nickels in
milligrams?
Coincidentally, a U.S. nickel has a mass of approximately 5 grams. If you had one
dollar’s worth of nickels in your jean’s what would be the mass of the nickels in
milligrams?
A. 
B. 
C. 
D. 
A. 
B. 
C. 
D. 
100 milligrams
50 milligrams
1,000 milligrams
100,000 milligrams
20 nickels make up one dollar, then one dollar’s worth of nickels would have a
mass of 5g x 20=100 grams. Next, the conversion between grams and milligrams
is done by multiplying by 1,000 (because there are 1,000 milligrams per 1 gram.)
Would the weight of the nickels pull your jean’s down off of your waist? 100 milligrams
50 milligrams
1,000 milligrams
100,000 milligrams
20 nickels make up one dollar, then one dollar’s worth of nickels would have a
mass of 5g x 20=100 grams. Next, the conversion between grams and milligrams
is done by multiplying by 1,000 (because there are 1,000 milligrams per 1 gram.)
Would the weight of the nickels pull your jean’s down off of your waist? Likely not. 100g = 100g/454 g/lb equals 0.22lb ~ the weight of a quarter pounder 6
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QUESTION
Answer
QUESTION
QUESTION
If you were unloading a 23.50 kg box of books from your car and a “friend” added two
more 482 gram chemistry books, how much in kg and using the rules for significant
digits, would you be lifting? A. 
B. 
C. 
D. 
Answer
If you were unloading a 23.50 kg box of books from your car and a “friend” added two
more 482 gram chemistry books, how much in kg and using the rules for significant
digits, would you be lifting? A. 
B. 
C. 
D. 
23.98
kg
24.464 kg
24.46 kg
24.5 kg
23.98
kg
24.464 kg
24.46 kg
24.5 kg
QUESTION
The average mass of a certain brand of vitamin C tablets is 253 mg. What is the mass of
three such tablets rounded to the proper number of significant digits?
A. 
B. 
C. 
D. 
0.760
grams
0.759 grams
0.7590 grams
0.253 grams
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Answer
The average mass of a certain brand of vitamin C tablets is 253 mg. What is the mass of
three such tablets rounded to the proper number of significant digits?
A. 
B. 
C. 
D. 
0.760
grams
0.759 grams
0.7590 grams
0.253 grams
Chem 106: Class/ Lab [ In-lab ASSIGNMENTS TODAY]
Fundamental Measurements: Turn in completed
experiment, Course/ Lab Manual initialed pp. 7-8 from last
week: one submission per pair)
Density Simulation Pre-lab (Course/ Lab Manual pg. 11:
Collaborative) DUE end of Lab Today (Turn in one per
collaborative group.)
3 tablets × 253 milligrams = 759 milligrams, then dividing by 1,000 converts the milligrams
to grams. Note the three is a count of the number of objects, not a measured quantity and
759 retains the same number of significant digits as the least found in related measurements.
Worksheet: Units, Measurements, & Conversions (Course/
Lab Manual pp. 3-4) In lab collaboration today. Turn in
completed Worksheet individually next week.
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