NATS 1730 Lecture 13: Topic Neurotransmitters Lecture 13
15 Feb 2017
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Document Summary
Plastics are synthetic materials derived from organic (carbon-containing) compounds. The most common sources for carbon compounds are oil (petroleum) and natural gas. Plastics consist of polymers - long molecule chains - often mixed with other substances such as coloring agents and softeners. The properties of a particular plastic depend on what the polymer chains look like, how they are bonded to each other, and which additives have been introduced. Thermoplastics, which melt when heated and can be remolded easily. Ziegler-natta catalysts revolutionized the production of plastics. Definition - a type of air pollution formed through solar radiation reacting with airborne pollutants, like nitrogen oxides and volatile organic compounds. Photochemical smog is composed of primary and secondary pollutants. Primary pollutants, which include nitrogen oxides and volatile organic compounds, are introduced into the atmosphere via vehicular emissions and industrial processes. Secondary pollutants, like ozone, result from the reaction of primary pollutants with ultraviolet light.
