How Fast? Flashcards
Order
Power to which the concentration of a reaction is raised in the rate equation
Overall order
The sum of the individual orders of reactants in the rate equation
Rate constant
Constant that links the rate of reaction with the concentrations of the reactants raised to the powers of their orders in the rate equation
Rate of reaction
Change in concentration of a reactant or product in a given time
Half life
Time taken for the concentration of a reactant to decrease by half
Rate determining step
The slowest step in the reaction mechanism of a multi step reaction
how are rate concentration graphs plotted?
from measurements of the rate of reaction at different concentrations
continuous monitoring
Concentraton–tme graphs can be ploted from
contnuous measurements taken during the course of a reacton
reaction mechanism
the series of steps that makeup an overall reaction
what does the exponential factor show
represents the proportion of molecules that exceed Ea and have sufficient energy for a reaction to take place
how to calculate rate constant from half life
k= ln2/ t 1/2
how to work out the initial rate of formation?
initial rate x big number infront of product q is asking about
what would a graph of in k against 1/t look like
straight line with negative gradient
why would an order of a reaction with respect to H2O be 0
water is in excess
5I- + IO3- + 6H+ -> 3I2 + 3H2O
rate= k(I-)2 (IO3-) (H+)2
Why is it unlikely that this took place in 1 step?
Stoichiometry in rate equation does not match stoichiometry in overall equation (so more steps must have been taken to fit stoichiometry in rate equation)
collision is unlikely with more than 2 species
