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위험물질 위험물질 (hazardous materials)
1 화학반응과 반응속도 (chemical reaction and reaction rate)
2 무거운 가스 (heavy gas) 3 저장탱크 (storage tank)
1 화학반응과 반응속도 (chemical reaction and reaction rate)
가.basic definitions
-a homogeneous reaction : involves only one phase
-a heterogeneous reaction : involves more than one phase, and reaction usually
occurs at the interface between the phases
-an irreversible reaction : proceeds in only one direction and continues
in that direction until one of the reactants is exhausted
an irreversible reaction behaves as if no equilibrium condition exists; strictly
speaking, no chemical reaction is completely irreversible; however, for many
reactions, the equilibrium point lies so far to the product side that these reactions
are treated as irreversible reactions
-a reversible reaction : proceeds in either direction, depending on the concentrations
of reactants and products relative to the corresponding equilibrium concentrations
-molecularity (반응 분자수, 분자도) : the number of atoms, ions, or molecules
involved (colliding) in a reaction step
unimolecular reaction : the most common example is radioactive decay
spontaneous emission of an alpha particle from u-238 to give thorium and helium
xxxx.xx.xx → 90th234 2he4
-ru kcu
the rate of disappearance of uranium
bimolecular reaction : the collision with free radicals (i.e., unpaired electron)
br c2h6 → hbr c2h5
-rbr kcbrcc2h6
the rate of disappearance of bromine
termolecular reaction : the probability of a termolecular reaction, where 3 molecules
collide all at once, is almost nonexistent, and in most instances the reaction pathway (이하 생략)
