CHM 111 Lecture Notes - Lecture 4: Room Temperature, Lead, Periodic Table
9 Sep 2015
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Chapter 1: the air we breathe part iii. Common units are: parts per million (ppm) and micrograms per cubic meter (ug/m3) Ppm: the number of particles in a million. 1 m3 (1 meter x 1 meter x 1 meter) = 1000l. You do not need to know how to convert from ppm to ug/m3. See appendix 2 of textbook for unit table. A pollutant is not hazardous unless it exceeds the standard. If two pollutants are concentrated over the same time frame, the pollutant with the lower concentration would be deemed more hazardous. Elements: cannot be broken down into simpler substances by any chemical means over 110 known; 90 occur naturally all matter is composed of one or more elements each has unique properties in its pure state (b. p. , density) Compounds: pure substance made of two or more di erent elements in a.
