Summary
Summary Topic 9 - rate equations
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A summary of topic 9 from AQA A Level Chemistry Specification
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'i ii
, mate of reaction
MONITORING GRAPHS . INITIAL RATE
REAETIOIXS
*
find gradient of
at time 0 --
curve
continuous
Yj¥g= 466.6
*
no .
monitoring
-
-
record at
time
regular
intervals
:
initial rate
find rate at
÷
.
INITIAL RATE
2×10's
GAS VOLUME METHOD
3×10-3-1×10-3
> use
gas
= 2×10-3 Use different conc
syringe
.
outrode
-
to work
> rate in conc per . 1.375-1-02 _-
unit
of time
#
0-355
osss ORDER rate
determining
µ
=
✗ 2×10-3
=/ 775 motdnisei '
step :
ZHC# Nacoz.si
'
0 order
slow step
EQUATION
-
o
2NAUE.CO#H.Q .
't
l order 0
rate
coz moles
determining
0 _-
gas so -
n=PV= 100000×1.4×10-4 for reaction :
step goes in
✓
"
RT 8-31×298 A # B. → (+ D 2 order the rate
5.65×10
>
=
moi equation : equation
OHC / moles Rate -- KIA]"[Btm
ARRHN.tl/SEQUATilANn--lmol
2=n #00110001
changes
man
If A
-
-
orders
I
equation
R=AeiÉi E- rate constant
0 -2:\ -
HCl :(0, rate same -0 order
so moles lost rate constant activation
1- (2×5.65×103)=0.988 mol
energy
e. of E- temperature R_=gas constant
Arrhenius constant
0 concentration
0-988/0-5=1-98
ctycoc.tl#.h...pA--- -
/
+
At all times
4+304+21*+1 "± ""
Ea=RT(In/A) lnlk)) } activation energy
paragraph
0 -
rate-KEH.com#EHII
PH CHANGE Graph :
if reaction R= 520m01 -1dm's plot /nlklvs 4- IKY
> "
-
.
grad.ua/-----Ea/R
produces Ht when CHSCOCH> =H+ line best fit
straight of
-
ions = 1.5×10-3
COLOUR rate 52011.5×10-35 GAS EQUILIBRIA
=/ -17×10-3 moldm-35
'
CHANGE Mole fraction _- gas moles
>
plot calibration k= moldm-351 total moles
carve moldnixmoldm-3 partial pressure _- mole fraction ✗ total pressure
Mol dm 's"
gas equilibria
'
convert into
-
Kp
>
_-
concentration constant
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