Kinetics

Question 1

k

Answer 1

rate constant or coefficient, dependant on T

Question 2

partial orders

Answer 2

used to calculate rate of reaction, not necessarily related to stoichiometry

Question 3

half-life

Answer 3

time required for a reactant concentration to decrease to half its initial value

Question 4

lifetime

Answer 4

time required for reactant concentration to decrease to 1/e of its initial value

Question 5

complex reaction

Answer 5

occurs in a number of elementary steps; evidence when partial orders do not match overall reaction stoichiometry

Question 6

reaction mechanism

Answer 6

full sequence of elementary steps for complex reaction

Question 7

intermediate

Answer 7

substance that appears in the reaction mechanism, but not in the overall equation

Question 8

elementary reaction

Answer 8

partial orders are equal to the stoichiometry

Question 9

rate determining step

Answer 9

elementary step of a mechanism that determines the overall rate of a complex reaction, because it is very slow

Question 10

catalyst

Answer 10

a substance that increases the rate of reaction without itself being consumed

Question 11

homogenous catalysts

Answer 11

reactants and catalysts in same phase

Question 12

heterogenous catalysts

Answer 12

reactants normally in gas or solution phase and catalyst in solid phase

Question 13

enzyme catalysis

Answer 13

catalysts are enzymes for biological systems

Question 14

molecularity

Answer 14

number of reactant molecules involved

Question 15

Example of homogenous catalyst

Answer 15

reaction of SO2 in the presence of NO2 to produce SO3