Chemistry CH2
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
