rate equations Flashcards
define rate of reaction
the change in concentration of a substance per unit of time
what is rate usually measured in
moldm-3s-1
what is the collision theory
for a reaction to be successful, particles should collide with sufficient energy, and at the correct orientation. The minimum energy particles need to react is called the activation energy.
why does a greater conc mean a greater rate of reaction
greater conc–> more particles in a given vol –> higher frequency of successful collisions, with the activation energy
what is the effect of increasing the SA on rate
increased SA –> more points of contact –> higher frequency of successful collision with the activation energy
give a general rate equation
R = k[A]m[B]n
how to you work out the overall order of reaction
by adding the powers of the concentrations
what is the effect on the rate constant with an increase in temperature
an increase in temp increases the rate constant
give the arrenius equation
k= Ae- Ea/RT
rearrange the equation for Ea
Ea = RT (InA - Ink)
how can you calculate the gradient
gradient = Ea/R
what is the gradient of a rate-conc graph equal to
the rate of reaction at that time.
what is the rate determining step
the slowest step in a reaction
rewrite the arrenius equation without the exponential sign
Ink= InA - (Ea/RT)
