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CH 221 Study Guide

# CH 221 Study Guide - I Introduction A Matter and...

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I. Introduction A. Matter and Measurement 1. elements – consist of individual atoms Molecules – consist of grouped atoms Compounds – contain two or more different atoms chemically joined together Mixture – contains individual units of both atoms and molecules 2. currently 117 elements are known 3. Changes a. physical change – substance changes its physical appearance but not its composition b. chemical change – substance is transformed into a chemically different substance 4. units of measurement a. si units i. kilogram (kg) meter (m) second (s) Kelvin (K) Mole (mol) Ampere (A) Candela (cd) b. prefixes PREFIX ABBRV MEANING EXAMPLE Giga G 10 9 1 Gm = 1 x 10 9 m Mega M 10 6 1 Mm = 1 x 10 6 m Kilo k 10 3 1 km = 1 x 10 3 m Deci d 10 -1 1 dm = 1 x 10 -1 m Centi c 10 -2 1 cm = 1 x 10 -2 m Milli m 10 -3 1 mm = 1 x 10 -3 m Micro μ 10 -6 1 μ m = 1 x 10 -6 m Nano n 10 -9 1 nm = 1 x 10 -9 m Pico p 10 -12 1 pm = 1 x 10 -12 m Femto f 10 -15 1 fm = 1 x 10 -15 m c. precision and accuracy i. precision – how closely measurements are to the same value ii. accuracy – how closely measurements are to the true value

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II. Atoms, Molecules, and Ions
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CH 221 Study Guide - I Introduction A Matter and...

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