Summary
Summary of Chapter 22 OCR A Level
- Course
- Institution
- Book
Summary study book A Level Chemistry for OCR A of Dave Gent, Dave Gent (Chapter 22) - ISBN: 9780198357650, Edition: 1, Year of publication: - (A Level notes)
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
Aromatic Compounds Year 2 Chemistry Alevel OCR A
-
OCR CHEMISTRY A - Transition Metals - detailed notes + practice questions
-
OCR Chemistry A Chapter 20-21 Acids, bases, pH and buffers Powerpoint
Seller
Follow
sram123
Content preview
O 3 / O 2 / 2 IChapter 22 -
Enthalpy and Entropy
22 .
I Lattice Enthalpy
lattice enthalpy a measure of the strength of ionic bonding in a
giant
-
ionic lattice
↳
enthalpy charge that accompanies the formation of one more of an ionic
compound from its ions under standard conditions
gaseous
↳
involves ionic bond formation from separate gaseous ions →
exothermic ,
-
ve OH
Factors affecting lattice enthalpy Why might the experimental and
→
Charges on the ions theoretical values differ ?
↳ →
t charge ,
t
enthalpy Most compounds have some
→
The radius of the ions covalent bonding as were as
↳
t enthalpy (
size ,
t closer ionic
bonding
together in lattice ) →
Comparing experimental and
theoretical values can show how
Born -
Haber cycles purely ionic a
crystal is .
GASEOUS IONS
Cicotte
-
→ a
-
Cg ) formation of
O & Standard enthalpy
ions
gaseous
Nacg ) Natcg,
change of formation Of Hot
-
→ + e
endothermic
NAU →
Enthalpy
+
Na A (9)
-
Cgl + →
change when
GASEOUS ATOMS
0
(atomization ] formation ROUTE 2 One mole of a compound is
of
vacs , →
Nacg , Saroyan endothermic lattice enthalpy formed from its elements
bond breaking
ELEMENTS IN
( lattice formation Under standard conditions ,
STANDARD
STATES lattice formation from gaseous ions) with all the reactants and
from elements
Na
+
I uz exothermic products in their standard States .
→ Nau
ROUTE 2
O &
p exothermic
Standard enthalpy of
-
IONIC LATTICE
Atonisation Oar Htt
→ Dat HE is endothermic as bonds are
→
The enthalpy
charge
broken that takes place for the
formation of one more of
gaseous
Atoms from the elements in it
standard State under standard conditions .
, & First ionisation
-0
* First electron He
energy Die H
affinity Den .
→ The enthalpy required to
→
The enthalpy change that
charge
remove one electron from each atom takes place when one electron is
in one more of gaseous It ions .
Added to each atom in one more
of to form more
gaseous atoms one
→
Die hot is endothermic of 2- ions
gaseous .
( energy needed to overcome attraction) .
→ electron affinity is the opposite ( energy
→
Dea Hot is Ekothermic As the
needed to ) electron
being added is attracted
-
electrons
gain in
towards the nucleus .
* successive electron affinities
→
second electron affinities are endothermic
02 (g)
-
O
O (g) 2e
- -
+
2nd electron affinity
&
DEA 2 H
1st electron affinity
't
( endothermic as you
DEAL H need to overcome the
repulsion benveen the
p O electron and already
(g)
- -
+ e
negative ion )
1 .
(a) (i ) first ionisation energy
( ii ) second election affinity
Ciii ) enthalpy charge of formation .
(b) (i ) "
Cag , +02 Cae ,
-
Mg MgO
→
es ,
Cii ) F (g)
-
e → F Cg)
-
+
Natg) te Brcg,
-
ztozcg,
t
( iii ) → 0cg ,
1st IE NAD 1st electronaffinity Br
2 .
(a) A -
formation ( b) -
325
B +496 Nat Cg) Cg )
-
t Br
electron affinity p
-
C Na Cgl Brest
-
Atomization
+
atomism on
-
or O
D -
ionisation Lattice Enthalpy
t 112 of Nasr
f
-
Ato thisAtion
'
NAGI t
z Br . Cs )
Atomisation Na
Lf
1- 108
(C) -
( -
325) -
( 496 ) -
( 112 ) Nacht 's Brass
formation Nasr
-
(108 ) t ( 361 )
- 361
'
752 O Nasr Cs)
-
O
KJ Mol
-
=
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 sram123. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.89. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
53068 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now