18 - Kinetics Flashcards
What are the units of the Arrhenius constant?
s^-1
How does the rate equation relate to the rate determining step?
The molecules used in the rate equation must be present during or before the rate determining step.
State how the initial rate is obtained from a graph of the concentration of the product against time.
Calculate gradient of tangent to graph at t = 0
Suggest why initial rates of reaction are used the determine orders rather than rates of reaction at other times during the experiment.
At t = 0, concentrations are known.
Does the rate constant change with temperature, and if so how?
Yes, as temperature increases, the rate constant increases.
Define order of reaction.
Define rate constant.
What is the rate-determining step?
The slowest step in a reaction, which controls the rate of reaction.
How can the order of reaction with respect to A be determined from the rate-determining step?
The number of moles of A in the rate-determining step is the same as order with respect to A.
How are intermediates shown in the rate determining step?
It is replaced with the substances used to form it.
