kinetics II Flashcards
rate of reaction definition
increase in the amount of products created in a reaction over time
rate equation in terms of concentration
channge in concentration/ change in time
whats the rate equation
K(A)2 (B)
making k subject of equation
k= rate / products and reactants
how to measure rate of reaction
increase in conc of products
or decrease in conc of reactants
what method is used to measure conc of a solution
titration or back titration
equation for rate
change in concentration/ change in time
gradient =
dy/dx
how to calculate rate of reaction
draw tangent on zero and go all the way up and work out the gradient of the line
how to find order of something from graph
find out gradients of different reactions and plot rate against concentration and see how much one increases when other does
order of curved graph of rate
2 and ALWAYS 2
rate equations for multi step reactions
cross out intermediates and find letters that are reactamts in overall equation and out into rate equation
rate determining step
slowest step in the reaction which determines the rate
boltzmans expression
e -ea/RT
units for T in equation
K
units for Ea in expression
J mol-1
units for R in expression
J K-1 mole-1
arrhenius equation
K = Ae -Ea/RT
what to do when given temp jumo eg 20 to 60
calculate initial k and final k and take away final from initial
ln
ln(ex) = x
natural logarithm with arrhenius equation
ln(A) - Ea/RT
natural log both sides of arrhenius equation
ln(K) = ln(A) - Ea/RT
make activation energy subject of equation arrhenius
Ea= RT (in(A) - in(K)
rearrange temperature in arrhenius equationwith natural log
T= Ea/R*in(A)-ln(K)
arrhenius equation in y=mx+c format
ln(k) = -Ea/R * 1/T + in(A)
gradient of line in arrhenius equation in y=mx+c format
-Ea/R
rearrange to find activation energy once gradient found
Ea= R * (-gradient)
answer always positive because double negative
x axis of arrhenius graphs
1/T
y axis of arrhenius graph
ln(K)
