Summary
Summary - Unit 13 - Energetics II
- Course
- Institution
In-depth complete topic summary revision.
[Show more]
Seller
Follow
megan555lewis
Content preview
ENERGETICS Icareful with rounding
STANDARD CONDITIONS : 101 UPa ↳ lattice energy-heat energy released when one mole of solid ionic compound
2984 ↳ can't be directly determined by experiments
Standard state
3
9 mol an ↳ themochemical cylee-based on formation of the icnic compound from its elevents in sta
e .
. Borne-Haber
g Cycle-includes all the
enthalpy changes involved in the formation of an isn't
ENTHALPY OF FORMATION OF NACK Nals) +
(1) (g) >
- NaCl Is
ENTHALPY OF ATOMSATION OF NO > Nalg)
Nals)-
ENTHALPY OF ATOMISATION OF CL E((z(g) +>
<(g)
+
1st IONISATION ENERGY OF Na Na (g) +
(((g) + e-
ELECTRON AFFINITY OF CI
X (g) + Y(g) +
e
-
-
SEAHO
Yig)
+
-y
(g) +
DisH
a
energy
X (g) + Y (g)
↑
Are He
1848
W
-
[
Q1) hig) +
11(3) + e- - - 420 .
24 -
90 -
436 + 706 = Deto Q2) Naig) +
Seton
↑ 4944
+
(g) (g)
-
+ x
+ +20
↓
U(y) + C /(g)
DEA Na(g) +
-84
=
int Est
12 =
122 high +
[Ch(g) -
706 -
388 Narg) +
+ go
Ym(s) +
=(19)
+ 109
YNais) +
-
436
↓ -
388
KCLIS)
FACTORS AFFECTING LATTICE ENTHALPIES POLARISATION OF IONS
12 121
↓
1
↓ I
=
p
I
t
⑦O
-
+1
-
can attract each other la
·
-
+
strongly-closely packed +2
-
more exothemic
more exothemic
---
·
ENTHALPY OF SOLUTION 1-tire (
-
+3 1-tire (
5
attraction greater
ionic creasesa increases
attraction
polarisability of
ania
(larger radius)
& gicntionic lattice I mone e-(
↳
dissociation
less attraction to
NaCl(aq) >
- Na + FACTORS AFFECTING HYDRATION ENTHALPIES
the nucleus
+
aq lag)
+ c (a) Imore-live the charge
mu
I ↓
I
-
1
+
·
F
hydration exerts more attraction
on water molecules
-
I and more released
EXPERIMENTAL LE
is
energy +2
US THEOR
more exothemic
00 -
more exothemic
- (
-
1-tire
W 1-tire ( +3
if LEexpt(Etheory a HIG
more attraction greater
attraction
assumption te ION
COMP
(almost 100 %)
if LEexpt FLEtheay assumption false
)
=
covalent character
IONIC LATTICE
+ SOLVENTAution SOLUTION DIFFERENCE BETWEEN LEExper AND LEmory
-
EXT
↳
and
cation c
↳ Marion ra
↳
cana
some cov
·
ENTROPY
temal stability
↳ read Q : live
entropy
: move
4) even is feasible reaction still not d e no
,
may occur
GASEOUS IONS + SOLUENT Kinetic factors
ENTHALPY = AHuya Ication) +
Alluyalarian) -
Alliant ↳ natural for systems to become more disordered over time unless work is done
tendency
↳ disorder than
is more probable order ENTROPY CALCULATIONS
HYDRATION exo
achieved
↳ more ways for a disordered state to be
DISSOCIATION Endo
-
2
1. 38x10 1) calculate Al
1
for the chemica
ENTROPY a measure of disorder J K-'mol-
·
low few ways to arrange its
components
S = uIm W 2)
Calculate the Assurroundings
I
·
high many equivalent ways
to
arange its components entropy
fancy
d ↳ no· of
component can
ways a
be arranged
log function
3) Calculate the &S system
ENTHALDYT
4) Calculate the AS
M
GASEOUS IONS
ENTROPY
GAS
S
ENTROPY INCREASES WHEN : 31
SH
- comment on the feasibility of the rea
↑
muD(AT)
IHLATT ↳ ionic solid dissolves
AH red Can evaporating ↳ solids melt
↳ liquids boil
gas molecules increases
up
↳ no
IONIC LATTICEL ↳ tuperance increases
AN SOLUTION
SOLID ! melting Sgas
>
Squid" S said
V V
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller megan555lewis. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $5.79. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79223 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now