CHEM 1111General Chemistry I

Laboratory

Fall 2011TA: 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 count9,463.721

7 Significant Figures

2. Zeros between non-zero integers always count109,034.81

8 Significant Figures

3. Leading zeros never count0.000052

2 Significant Figures

4. Trailing zeros always count in the presence of a decimal point.

0.07081006 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 mmThe result has 1 significant digit after the decimal

Significant Figures

1,984.2007 Significant Figures

0.0023164 Significant Figures

1.22300 x 10-4 6 Significant Figures

Practicing Significant Figures

Reading a Meniscus

• http://www.youtube.com/watch?v=D_g0U3vxr18&feature=related

http://morrisonlabs.com/meniscus.htm

6.62 mL

Reading a Meniscus Practice

http://morrisonlabs.com/selfcheck662answer.htm

11.5 mL

Reading a Meniscus Practice

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

Drawer Assignments Safety Procedures Equipment Check-in Demonstrations

Questions?