Transcript Chem 1201 - LSU Department of Chemistry

Watkins
Chapter 1
CHAPTER 1
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Atoms vs. Molecules
Element vs. Compound
Pure substance vs. Mixture
States of Matter - (s), (l), (g)
Units - SI (Metric) Prefixes
Exponential Notation
9876 = 9.876  103 = 9.876E3
• Dimensional Analysis
• Math Prep:
A button on your calculator:
E or EE or Exp
– Appendix A (text)
– Math Toolkit (Moodle)
– Math Review (Mastering Chemistry)
Chemistry 1201
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Brown & Lemay
Watkins
Chapter 1
Units (Dimensions)
Almost every number in chemistry is a
physical measurment of something.
Some common fundamental (SI) units:
length (m)
mass (kg)
time (s)
Combined units
acceleration (m/s2 = m·s-2)
density (kg/m3 = kg·m-3)
energy (kg·m2/s2 = kg·m2·s-2)
Every measured quantity must include the
units of measurement.
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Watkins
Chapter 1
SI (Metric) Prefixes
Homepage > Extra > SI Prefixes and Log Scales
Table 1.5: MEMORIZE
Chemistry 1201
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Brown & Lemay
Watkins
Chapter 1
Dimensional Analysis
Homepage > Extra > Dimensional Analysis
Dimensional analysis is a mathematical technique
which converts one set of units into another set
of units:
velocity: 50 miles/hr = 80.5 km/hr = 22.4 m/s
density: 2.34 g/cm3 = 2340 kg/m3
stoichiometry: 28 g N2 = 34 g NH3
LEARN THIS TECHNIQUE
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