rate equation and orders Flashcards
define rate of reaction
the change in concentration of a reactant or product per unit time
define order with respect to particular reactant
the power to which the concentration of the reactant is raised in the rate equation
what does ‘zero order’ mean?
change in concentration has no effect on rate
what does ‘first order’ mean?
change in concentration has a proportional change on rate
what does ‘second order’ mean?
change in concentration has a proportional squared change on rate
define overall order
the sum of the individual orders
how are orders determined?
through experiments
define rate determining step
slowest step in a reaction mechanism of a multi step reaction
what is the effect of temperature on rate constant K?
- more kinetic energy
- more collisions
- rate increases
- k must increase for equation to balance
- concentrations remain constant
define half life
time taken for concentration of a reactant to reduce by half
what does a first order reaction graph look like?
straight line from origin
what does a second order reaction graph look like?
curve going upwards
what does a zero order reaction graph look like?
straight line across
if the rate of reaction is faster, the value of k is …..
greater
what do rate concentration graphs help us to do?
identify the order of reaction
