CHEM B1110 Lecture Notes - Lecture 2: Sulfur, Decimal Mark, Fluorine
8 Dec 2016
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Matter- anything that occupies space and has mass. Elements: substance that cannot be broken down into simpler substances even by a chemical reaction classified as metals and nonmetals, compounds- substance composed of two or more elements combined in definite proportions. Need to know the first 20 elements and what symbol goes with them. Molecules composed of atoms- balls represent atoms and colors distinguish different atoms. Weight is differe(cid:374)t (cid:449)eight is bound by gravity mass is not. 1 m/100 cm or 100 cm/1 m = 1. Common units- cm^3 = milliliter (ml), liters (l) Rules of exponents: whe(cid:374) (cid:373)ultipl(cid:455)i(cid:374)g add e(cid:454)po(cid:374)e(cid:374)ts, 10^(-4) * 10^(6) = 10^(2, whe(cid:374) di(cid:448)idi(cid:374)g su(cid:271)tra(cid:272)t e(cid:454)po(cid:374)e(cid:374)ts, 10^(-4) / 10^(6) = 10^(-10, whe(cid:374) raisi(cid:374)g to a po(cid:449)er (cid:373)ultipl(cid:455) (10^(-4))^2 = 10^(-8, whe(cid:374) e(cid:454)tra(cid:272)ti(cid:374)g a root (cid:373)ultipl(cid:455) (10^(-4))^(1/2) = 10^(-2) All digits that are not zero are significant. Zeros between decimal point and first non-zero digit are not significant.
