CH3.5 Chemical Kinetics Flashcards
Quenching
Is the sudden stopping or significant slowing of a chemical reaction to allow for analysis to occur without the reation proceeding further.
Activation energy
Is the minimal amount of energy required for a collision to be successful
sampling and quenching
when a small amount of the reaction mixture is reoved at regular time intervals (sampling) and immerdiately placed into iced water. This cools and dilutes the reaction mixture, which slows the reaction down and effectivelyy stops it. (quenching)
most common way for samples to be annalysed
Through titration
advantages; can be used for a large range of reactions
disadvantages; takes a lot of time, and it is only appropriate when a reaction mixture is homogenous.
simple rate equations
rate = change in concentration / time
units of rate
moldm-3
rate
the change of the concentration, or the amount of a particular reactant or product
rate constant,
plus when it is constant and when it is not
is the constnat in the rate equation. It is constant for gven reaction at a particular temperature and is not affected by changing the concentration of the reactants. It is not constant if we change the temperature
order of reaction
the order of a reaction with respect to a particular reactant is the power to which the concentration is raised in the reaction equation
rate equation
Rate=k(A)^m(B)^n
what is the overal order of the reaction
the usm of the orders of reactions
mechanism
A description of the series of steps that occur during a chemical reaction
rate-determining step
is the slowest step in a reaction mehcanism
what does the rate-determining step tells about particlues colliding
the order of the rate determining step tells us the number of particles that is colliding , first order- one particle colliding, secound order- 2 particles colliding etc.
arrhenius equation
k=Ae^(-Ea/RT)
