CHEM 1111
General Chemistry I
Laboratory
Fall 2011
TA: Elizabeth Braun
CHEM 1111.110
Contact Information
 Elizabeth Braun
 ein100020@utdallas.edu
 Office Hours:
– Wednesday 11:00am-12:00pm
– GEM Center
 Syllabus
 Safety
 Lab Set Up
 Workshop
 Assignment of Drawers
Significant Figures
1. Non-zero integer values always count
9,463.721
7 Significant Figures
2. Zeros between non-zero integers always count
109,034.81
8 Significant Figures
Significant Figures
3. Leading zeros never count
0.000052
2 Significant Figures
4. Trailing zeros always count in the presence of a
decimal point.
0.0708100
6 Significant Figures
Significant Figures
5. When using multiplication or division, the final
number of significant figures is determined by
the measured number with the smallest number
of significant digits.
Measured Values: 230.1 g, 230.14g, 230 g.
The result has 3 Significant Figures
Significant Figures
6. When using addition or subtraction the final
number of decimal places is determined by the
measured value with the smallest number of
decimal places.
Measured Values: 14.57 mm, 16.021 mm, 15.9 mm
The result has 1 significant digit after the decimal
Practicing Significant Figures
1,984.200
7 Significant Figures
0.002316
4 Significant Figures
1.22300 x 10-4
6 Significant Figures
Reading a Meniscus
• http://www.youtube.com/watch?v=D_g0U3vx
r18&feature=related
http://morrisonlabs.com/meniscus.htm
Reading a Meniscus Practice
6.62 mL
http://morrisonlabs.com/selfcheck662answer.htm
Reading a Meniscus Practice
11.5 mL
http://morrisonlabs.com/selfcheckansw115ml.htm
Reading a Meniscus Practice
52.8 mL
In Lab Protocol
 Place Personal Items on Shelf
 Keep goggles, notebook, lab handout
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Drawer Assignments
Safety Procedures
Equipment Check-in
Demonstrations
Questions?