Rate equations and mechanisms

Question 1

for a reaction to occur at a particulate level, particles must

Answer 1

first collide in the correct orientation and with sufficient energy for products to be formed

Question 2

a reaction in which a single collisions between the two reactants is described as being

Answer 2

elementary

Question 3

the hydrolysis of halogenoalkane by hydroxide ions is a ……………….reaction

Answer 3

nucleophilic substitution reaction

since the hydroxide ion acts as a nucleophile and replaces the halogen atom in the halogenoalkane

Question 4

if we know that a reaction is elementary, then we can deduce the…………….from the stoichiometric equation

Answer 4

rate law

Question 5

if we know that NO + O3 = NO2 + O2 is elementary, then the rate equation is

Answer 5

rate = k[NO][O3]

Question 6

if a reaction is not elementary, then it takes place via a series of interconnected

Answer 6

interconnected steps collectively known as the mechanism of the reaction

Question 7

if the experimentally determined rate equation does not match the overall stoichiometry, then the reaction is not

Answer 7

then the reaction is not elementary

Question 8

in the rate equation, the order number indicates………………..and the species in the square brackets indicates…………….

Answer 8

order number: number of molecules involved in the rate determining step
species: this is the only species involved in the rate determining step