1. CHE116 Introduction
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2. Topics Syllabus, experiment schedule, supp. packet
Inventory of student drawers
Safety items and contract
Calibration scales
Scientific method and assignment
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3. Safety Concerns
Additional safety concerns that were not mentioned on the safety contract will be discussed using another PowerPoint file.
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4. Calibration Scales
Know how to read the calibration marks on a piece of calibrated glassware and determine:
the correct number of significant figures
the correct volume reading
RCBC YouTube video for practice
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5. Graduated Cylinder 10 mL and 100 mL sizes are most common
0.0 mL when empty, mL when full (or mL when full)
In General:
Find difference between numbered tick marks
Use the un-numbered tick marks between the two numbered marks, count the number of jumps from one numbered mark to the other
Determine what each un-numbered mark is worth
Estimate one digit beyond the un-numbered tick marks (this is the last significant digit for the volume)
Read the volume, using the correct number of significant figures
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6. Graduated Cylinder (in student drawer)
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7. SF and Volume Reading
Difference between numbered calibration tick marks:
8 mL – 7 mL = 1 mL
There are 9 un-numbered tick marks between the 7 and 8 marks (10 jumps from 7 to 8)
Each un-numbered tick mark is worth:
1 mL / 10 jumps = 0.1 mL per jump
Estimate one digit beyond un-numbered mark
0.1? mL (use 2 digits after decimal point for SF, . _ _ mL)
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8. Read a Volume with Correct SF
10 mL graduated cylinder (use 2 SF after decimal point for volume reading)
Read volume at the bottom of meniscus, at eye level
More than 7, less than 8
7.? ? mL
7.5 ? mL
7.53 mL
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9. Scientific Method Scientific method PowerPoint
MythBusters assignment: Watch one episode from Season 4 and explain which parts of the episode correspond to the different steps of the scientific method.
DVDs are on reserve at the Mt. Laurel library; 30 episodes on 6.
Current student ID with library barcode, headphones needed in computer area.
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