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Summary AQA A level chemistry rate equations revision notes
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A helpful and comprehensive set of revision notes covering the entire rate equations unit of AQA A level chemistry
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Kinctics18.1 RATE OF REACTIONS 13.2 RATE EXPRESSIONS
Rate ot reaction is Lhe change Concentraton ot reactants or product
with nit time
(oncentration
Graph tor the reactin otA’B
lo tnd the rate at a partiula time,
dsaw a tangent to the cuve and
fund the qradieat. Rate at t:0 s the
ntial rate.
Lume
Rat Expression
Rate eauation caa ony be detecnaun ld by expenents.
Rat : k [AJ" B]
m and the ordes of ceactin with respect to AcndB
k s the rat constant with variable wnits
00 orde- change in n concentration has no ettect on sate
masslve exess or used atter cate aeernnng steO
o when sold
in cat
order -
-change inn concentation
coaceatation has
has a proportional claange
concentratin
2 orde -
cate s proporhonal to the sq,uare ot
n rate equation
Order - the power to wwhih a concentration is cased
constant otpopartionalltby n rat eauatLon
Rate constant m t n)
Overal order - Sum ot ndmdual ardes le-q
+ H +
LlH,c0cH3 order with cespect to H
respet to propanont. (t
|5t ocde with
Rate i k CCH, cOCH, JCH']
, 18.3 DETERMIN| NG RATE EQDATION
Findina ordee ot reactËon usina rate concent rotion qraphs
Rati
Rat
CAJ CAJ
Zero order Ercst order 5econd ord
Initial Rate Method!
A serts ot experiments are carriad out at constont
tempeature.
Between any paur of experiments,concentrution of only One spees variis.
Plot araph ot Loncentrat1an aganst time
Initial NO]/ Iaitial [O,]/ lnitiad ratel
moldn -3 Moldm3 moldn'!
Ix 10
3
2× 10 Ix)03
2 x10
Compaing Iand 2 NO1 Is doubled but O,1 stays the
Rate auadruples whch suqgests rate INO) same 2
Compaing 2and , [o] is doubled but CN0] stays the same.
Rote doublus whch su4q ests rate L0]
Rote ik CNO C0,]
Roti constant k
28 x 1G4: k ( 2x10) x (| x 10)
lhe rat onstent alows you to compare the speeds of
qiven temperat we. ine lacqe the value dittecnt
of k
tne taste the reaction.
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