Chemistry CH2

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combustion

chemical process of burning; that is the rapid combination of feul with oxygen to release energy in form of heat and light

catalyst

chemical substance that participates in a chemical reaction and influences its rate without itself undergiong permanent change

chlorofluorocarbons

compounds composed of the elements Chlorine,Fluorine,and Carbon (but do not contain the element hydrogen) CFC's

hyrdochlorofluorocarbons

compounds of hydrogen, chlorine, fluorine, and carbon, HCFC's

electromagnetic spectrum

continuum of waves that ranges from short, hight energy X-rays and gamma rays to long low energy radion waves

hydrofluorocarbons

coumpounds Hydrogen, Fluorine, and carbon HFC's

double bond

covalent bond consisting of two pairs of shared electrons

triple bond

covalent linkage made up of three pairs of shared electrons

wavelenght lambda

distance between succesive peaks

wavelength

distance between succesive peaks

quantized

energy distribution is not really continuos but consists of many individual steps

octet rule

fact that electrons in many molecules are arranged so thta every atom (except hydrogen) shares in eight electrons

respiration

foods we when are matabolized to produce carbon dioxide and water

free radical

highly reactive chemical species with one or more unpaired electrons, because of the unpaired electron free radicals are highly reactive

Alkali Metals 1A

highly reactive metals with one outer electron

photons

individual bundles of energy

halons

inert non toxic compounds that contain chlorine or fluorine (or both, but no hydrogen) and in addition they contian bromine

frequency (V)

number of waves passing a fixed point

nana meter (NM)

one billionth of a meter

mixture

physical combination of two or more pure substances present in variable amounts

ozone

pollutant that forms in the presence of sunlight from other pollutants

chemical reaction

process whereby substances described as reactants are transformed into different substances called products

alkaline earth metals 2A

reactive metals with two outer electrons

halogens 7A

reactive non-metals with 7 outer electrons

lewis structure

represetation of an atom or molecule that shows its outer electrons

endothermic

requires energy for reaction to occur

polar statospheric clouds PSC's

thin clouds composed of tiny ice crytals formed from the small amount of water vapor present in the stratospher

single covalent bond

two electrons (one pair) are shared between two atoms

covalent bond

two electrons that are shared

isotopes

two or more forms of the same element whose atoms differ in # of neutrons

noble gases 8A

unreactive metals with 8 outer electrons

gamma rays>X-rays>UV>visible>IR>microwave>radio

wavelengths from biggest to smallest


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