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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

ï‚§ Example 1:

ï‚· 1 lb = 453.6 g

ï‚· We want 256 g converted to lb

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ï‚· Conversion factor = (desired quantity)/(given

quantity) = (1 lb)/(453.6 g) = 1

ï‚· (256 g) x (1 lb/453.6 g) = 0.564 lb

ï‚§ Example 2:

ï‚· A copper wire is 15.02 meters long, what is the

length of the copper wire in inches? (1 in = 2.54 cm)

ï‚· (15.02 m) x (1 in/.0254 m) = 591.34 in

ï‚· (15.02 m) x (1 cm/ 10-2 m) x (1 in/ 2.54 cm) = 591.34

in

ï‚§ Example 3:

ï‚· 2453.4ft3 x (12in/1ft)3 x (2.54cm/1in)3 x

(0.01m/1cm)3 = 69.47m3 = 6.947 x 10-1 m3

ï‚· 48Âµg/m3 = 4.8 x 10-5g/m3

ï‚· 4.8 x 10-5g/m3 x 6.947 x 10-1m3 = 0.0033g/m3

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