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Unformatted text preview: Chapter 1 Significant figures (sf) 1. Make sure that the measured quantity has a decimal point. 2. Start at the left of the number and move right until you reach the first nonzero digit. 3. Count that digit and every digit to its right as significant. Ex- 0.1044g (Four sf) 57,600.s (Five sf) 0.0000007160 cm 3 (Four sf) Macro/Micro/Symbolic 1. What does it look like – Macro 2. Ball and stick model – Micro 3. Chemical formulas – Symbolic Ex- Mg ribbon + Heat I. Macro- Mg ribbon heated, light generated, dull metal left II. Micro- III. Symbolic- (2Mg + O 2 2MgO) Physical/Chemical Changes 1. Physical change- When a substance alters its physical form, NOT composition. Ex- Solid water Liquid water Gas (water vapor) REVERSIBLE! (Heat Added) Gas (water vapor) Liquid water Solid water :D (Cold Added) 2. Chemical change- When a substance is converted into a different substance....
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This note was uploaded on 04/03/2008 for the course CHEM 103a taught by Professor Weso during the Fall '08 term at University of Arizona- Tucson.
- Fall '08