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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 postpoint digits as input value with fewest postpoint 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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 Fall '07
 Van Koppen
 Atom, si base units, fewest postpoint digi, fewest signi1Ccant 1Cgu, division addition subtraction

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