CHEM 1A F08 lecture notes: Notational conventions, etc.

CHEM 1A F08 lecture notes: Notational conventions, etc. -...

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Unformatted text preview: CHEM 1A Week 2: Monday Misc. technical Notation A ZX where A = mass number,Z = atomic number SI base units and prexes <omitted> Unit conversions Temperature These should be committed to memory. • TC = 5 9 (TF − 32) → TF = 9 TC + 32 5 • TK = TC + 273.15 Signicant gures in scientic notation Signicant gure Rules multiplication division addition subtraction Any digit except leading zeros, placeholder trailing zeros, spurious/extraneous digits Result should have as many signicant gures as input value with fewest signicant gu ↓ Result should have as many post-point digits as input value with fewest post-point digi ↓ Dimensional analysis <omitted> 1 Matter and Energy Matter: Energy: Anything that occupies space and has mass Ability to do work Categories of matter (recap) • Mixtures   Homogeneous mixtures ∗ ∗ Heterogeneous mixtures Pure substances Elements · · ∗ · · Atoms Molecules Compounds Ions Molecules Atomic Theory of Matter Signicant: Dalton's Atomic Theory Structure of the atom Nucleus central core of the atom; positively charged; contains most of the mass negatively charged; very light; exists in the region around the nu- Electrons cleus 2 ...
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This note was uploaded on 12/10/2008 for the course CHEM 1A taught by Professor Van koppen during the Fall '07 term at UCSB.

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CHEM 1A F08 lecture notes: Notational conventions, etc. -...

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