General Chemistry Lab 1111
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Transcript of General Chemistry Lab 1111
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Section:109 – 1:00 to 3:30 pm (Wednesday)112 – 4:00 to 6:30 pm (Wednesday)125 – 3:00 to 5:30 pm (Saturday)
General Chemistry Lab 1111
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Instructors & TAsSection 109 – Dr. Jie Zheng
Rodrigo Vinluan ([email protected])Sasha Sun ([email protected])
Section 112 – Dr. Steven NielsenRodrigo VinluanImalka Munaweera ([email protected])
Section 125 – Amandeep SraRodrigo VinluanXiaofeng Song ([email protected])
OFFICE HOURS: Sunday 4 – 5 pm in GEMS Center
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Syllabus eLearning Course Description Required Books & Materials Make Up Labs Penalty Points Workshop Lab Assignments Notebook Write Ups Data Clean Up! Broken glassware (breakage form to Stockroom) Grading Criteria Withdrawal from Class and Religious Holy Days
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Safety
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Safety GogglesGlovesClose-toed shoesLong pants – no
shorts!No food or drinkLabel all glasswareWork under the fume
hoodNever put chemicals
directly on a balance!
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Safety (continued)Know the location of
safety equipmentSafety showerFire extinguisherEyewashFirst Aid kit
Dispose broken glass in a proper container
Dispose chemicals/wastes properly
Wash hands
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Experiment 1: Basic Lab OperationsA) MeasurementsB) Significant FiguresC) Reading a Meniscus
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Experiment 1: Basic Lab Operations (continued)A) Measurements
MassBalances
VolumePipettes and pipette
bulbs
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Experiment 1: Basic Lab Operations (continued)B) Significant Figures Rules1) ALL non-zero numbers (1,2,3,4,5,6,7,8,9) are
ALWAYS significant. (i.e. 12,345 = 5 sigfigs)
2) ALL zeroes between non-zero numbers are ALWAYS significant. (i.e. 1001 = 4 sigfigs)
3) ALL zeroes which are SIMULTANEOUSLY to the right of the decimal point AND at the end of the number are ALWAYS significant. (i.e. 0.0100 = 3 sigfigs)
4) ALL zeroes which are to the left of a written decimal point and are in a number >= 10 are ALWAYS significant.(i.e. 100. = 3 sigfigs)
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Experiment 1: Basic Lab Operations (continued)B) SigFigs ExamplesNumber #Significant Figures12,435 5100.5 40.0020 21.00000 64,000,000 10.0100 3
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Experiment 1: Basic Lab Operations (continued)B) Sig Figs
When adding or subtracting your answer can only show as many decimal places as the measurement having the fewest number of decimal places.Ex. 3.76 + 14.83 + 2.1
20.69 20.7When multiplying or dividing, your answer may only show as many significant digits as the multiplied or divided measurement showing the least number of significant digits.Ex. 31 x 21 = 651 6.5 x 102 or 650
100.0/1.0 = 10 10.
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Experiment 1: Basic Lab Operations (continued)C) Reading a
MeniscusMeniscus is the curve in the upper surface of a standing body of liquid to the surface of the container or another object. A:concave B: convex