CHEM135 08_31 Notes

CHEM135 08_31 Notes - CHEM135 PERSPECTIVES OF OBSERVING THE...

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Unformatted text preview: CHEM135 PERSPECTIVES OF OBSERVING THE NATURE OF CHEMISTRY 8/31/07 2:59 PM PERSPECTIVES OF OBSERVING THE NATURE OF CHEMISTRY MACROSCOPIC What we observe about substances and their reactions MICROSCROPIC Particulate Focus on small components to interpret what is observed SYMBOLIC Chosen to represent and communicate what we observe + understand MATTER 1. Physical Properties Variables measured. No change in actual substance 2. Chemical Properties Things observed when actual substance changes. Ex. Corrosion, combustibility, etc. PHASE STATES OF MATTER 1. Solids Retain shape 2. Liquid Adapts to shape of container 3. Gas Expands to occupy volume ACCURACY HOW CLOSE TO TRUE PRECISION HOW REPRODUCABLE RESULTS ARE ERRORS RANDOM (mostly due to machine error) SYSTEMATIC (due to Inductive Reasoning if 1 works, all work Deductive Reasoning if 1 and 2 works, then 3 works UNITS #atoms in Carbon-12 = 6.022 x 10^23 Learn from Tera (10^12)...
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This note was uploaded on 04/29/2008 for the course CHEM 135 taught by Professor Brooks during the Fall '08 term at Maryland.

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CHEM135 08_31 Notes - CHEM135 PERSPECTIVES OF OBSERVING THE...

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