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[CHEM 131] - Final Exam Guide - Everything you need to know! (31 pages long)


Department
Chemistry
Course Code
CHEM 131
Professor
Shuhua Ma
Study Guide
Final

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TU
CHEM 131
FINAL EXAM
STUDY GUIDE

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Chem 131 8/27
Chapter 1
- Chemistry
o The study of matter and the changes it undergoes
- Matter
o Anything that has mass and takes up space
- Measurement
o Memorize the SI units for length, mass, time, temperature, and
amount of substance (Table 1.2)
o Memorize meaning of metric prefixes
- Significant figures
o Nonzero numbers and zeros between nonzero numbers are
significant
o Zeros at the beginning of a number are not significant
o Zeros at the end of a number with a decifmal point are
significant
o Zeros at the end of a number without a decimal point may not
be significant
- Dimensional Analysis
o (given quantity) x (conversion factor) = desired quantity
Example 1:
1 lb = 453.6 g
We want 256 g converted to lb
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2
Conversion factor = (desired quantity)/(given
quantity) = (1 lb)/(453.6 g) = 1
(256 g) x (1 lb/453.6 g) = 0.564 lb
Example 2:
A copper wire is 15.02 meters long, what is the
length of the copper wire in inches? (1 in = 2.54 cm)
(15.02 m) x (1 in/.0254 m) = 591.34 in
(15.02 m) x (1 cm/ 10-2 m) x (1 in/ 2.54 cm) = 591.34
in
Example 3:
2453.4ft3 x (12in/1ft)3 x (2.54cm/1in)3 x
(0.01m/1cm)3 = 69.47m3 = 6.947 x 10-1 m3
48µg/m3 = 4.8 x 10-5g/m3
4.8 x 10-5g/m3 x 6.947 x 10-1m3 = 0.0033g/m3
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