This summary sheet provides a detailed revision of Entropy taken from Chapter 25 of the OCR A-Level Chemistry textbook, although the material is applicable to any exam board.
There are explanations of Entropy Values, Feesible Reactions, Free Energy, Spontaneous Reactions, Entropy Graph and all t...
Foundations in Chemistry (Module 2) Summary Notes A-level Chemistry
Periodic Table and Energy Change (Module 3) Summary Notes A-level Chemistry
OCS AS LEVEL CHEMISTRY A 2023 VERSION 2 DEPTH IN CHEMISTRY GRADED A+ GUARANTEED PAS
All for this textbook (84)
Written for
A/AS Level
OCR
Entropy
Chapter 25
All documents for this subject (1)
Seller
Follow
leilasayshi
Content preview
r;_,itropy==
p~r ~ ou.
s (jK-.',r, ot-•)
jOL.H2.J <'. t1<.e.Lu ,n
I th lSQillAIY\ei{re" f
me. crys-t-011,rie.
forr,,O f- O HAbH0n<.R
at DK .a-· i , o puf-ect WT\~ tttlptrutu.rt 1HO.lltd O
tE~Sl81.E
• .
l£Atno~u:
. h
·~ t QUlOI\ 11111'\lt. CCLI\_
"-o.,,tn t.t" _ade+errnine ifa reo.ctiofl is f~es 11o,e tau_ into account.
- - . . ,e nth0-1py c/1 o. 119eJ 01 +he re actiot1 {c1H)
entropy cha119n O f the r eo c h'on (rLi~)
•
0
tro 11 y i1a,w. ery \ tUL . HaJlblt rtQc.tion. ~mp. r eacn ·o n at:.
Y some. or e rndo,nerm\' c.
L .
A JUbHonuz riaJ et1 .
of. o a..t OK . . ~rorn 11q,u.1ct ~o 9a1 . .
~0 1~erd11f e renu. c1VJ.t0 howct.i\o rd-A.r<2d now. dunng~ chetnlCol f;£S,lt.El,SPONTAN~~
d 1· 1d rg~o.s
'
-.)011 1q_u
tntt1)f~
incrttstl go\~l arQ. fQOCnon, HH entropyot It- got forrnlo. " /treae,n·on w. on f
1Y10J1orct.ut1d }
WJ.Jtorct.ue.d / CllCl s4Hemmoyc honege. ·re 1u t,oppe 11 aJlcn..! ·
l ·, e11tr0 11 M Ol ten t rD)? \J l\ibitGnU. . . rll j Pd~-vetisfr os 1t /J { () OS/blPCHO.
owe P:, .., MlltS Achem 1c cu r eo.c.hor1 ,nt,<J h , ch ~JOJcleJ.......d.Qn ~QJ - cen-a 111 t- e mp . rh1 s mCLy
~NTlOPV\IAW£1:~ <?nrropy of .f' ' J· f em . .d bed.,W... t-o ach·vo h 'on ~ne.rgy
Ht)JtU u,-m,,y VClt'-0. =: ':7
/ f\,l"r ..-,1cJ·
' ·"' n, 1qu1 or gos
1 th~n . . - - --
.r111AK EJ TJ-JE JVJrEM f"rv (;6 ¤71C llf._l-'/ @ I ,EeAJJ.g t oo li1 9 h.
IMoN., r"'-A. cu.yea. -,..,:Lfsorfl.lJ.~ &ie,gy1I '11 6R . tVQ t.S • A :iponrane o u.s reo.c h on , (J
J :----Il'r eod aut:. ., iT flB l& . .--::i a.nct.: IY!Ore.t<H'Sll:lll..
, {. fY1QOni g_[SOrde r
4 5011 Cl£ =1 owe r vo 1w.(mc,eoro.HeclJ
,-:-:;---~:-:-:=::-:-:-:-:-- --.1.U.....L...!Yl~O~l l~C~r_geaQJjsci£
'd . ./-f'OJ I b / I!.. (;1 n d Ofl I~ oc.c U rs uncu.r
.'.cryao111ne so lid w/ n1gh1y orciO.-red 6.SfJ =sumo~ Pl1ldUcts_ .sum opeo.ttont~ 1 sn,nd. ard cond/n ·o n1.{A&rr ne<?dJ
arran_gQ.men~ has low ~ntror,y _ entrcpl)VOIWJ entrap\,) V(lll,LQ.j '¥ f-Ob,:> /fJ I 1-hor, O Ond ha.Vl low
more.. . .
LI IV\o.uom ot.tc.uJ..o..r strucru. r e.1 ha.v e Ct \Je. dispmal Oftners!I fenstb(Q reacn·
enou.Jh o. c nvailon "nergLJ fO.r
Low rn t( O,P.,lJ u0, lwt QS t he..Y Ml.Al e. 0.. Ve.':} ' within H, t Chttnlco.1/ Sf Or> ti) pYO(..(ULd uncu,r
nd ard c o ndin'onJ)
!_%i Lila.r Strueture. . ->rnme t or fYIQ.tiOll C& i on 1C MO.Klh9v.pthteh eh1ICAl
14
1 'i,mJ.ctU. YQ S dWl. tO Hie.If
s_ystmi. Cton Af-/.fth"n.J 1e.o.1i61Jlly:
trw. t-o r 'Chem ical rea.c h ·ons f\me: MU5T be decrease '"-7eWh~1- h e.r o. rQaChon 1; endo rherm •c .
·. .
Ord.!.1,.((l_ d. l a.tt,U'd rel.£0.Se <2(1f? r ou Oi ln rQ.at · f.rH energy fOro.reoC110n
1n ...., )(0,herrn1c ' , or
trlOUUJ..lO.t' . v ·
trU ltu l l -~ re9u.tat1u orru., ed c. 1yH0lli11e o.n cl canpeuJecl (O d o t0be fQQ\1bl.Q. 6H' - ..-~ -....=
--..-c G"- ---.-,; ,.c;c :: ,,.;;;::
111ru, - - - - -
1~ d1Ylt ! 1(a ) ..Jb I l:J.Sf.fU-,1-tva~K. t:,.(JS j~used-topred.ft t Negatlve Negatlw Negati.. ORpositl,e/Oo•" ""''W"""'"" MPL
( 0 5u StOlW . lribbl. ,..-+
~@( -
w·n.:,heroY-n
t>L or o Negative Positive ALWAYS"'''"" 100.,,,. ,, ,'"I""''"''"''
note: I~ ~uu hClue. o. nund:ier of .d (r = mCA\(I mum UH 'UI worK
j.
' '
Sub:, in W fll l HO re,
t O 11 OJ Q,U
'h at- co.n be. ct one1- b
I C\
rea ch on n f QCl lf to LQ.
,Positive
Positive
Negative
Positive
ALWAYSposlllve
Negativeorposltive
, ,. , . ...... ,,o oo<( MP
fl U\lb lf Clb Qllf ct no.,n tf n, p.r
9'1Mra11;1, tht h1'9her the M.r = +reQ energy Che.m,-C'..(l! rea.ch"ony (a Va.lu.e. Of Oor lo wer iJ ~QOJi° b1e')- s+ahdard_ e,n1rop_y o~ on~ moltof<A
hig hu entropy i,1.1111 be .
twnopy 6-RAPH',
C:'"-;'(l(n.- 1
)~ e
1,;,hn119e . "-£--:-::---::-------.
O
G-Gl = LlH - r~s'lfr~ reo.rrange t-0 +in cl +emp.
I I \ CH Lllh h .
entropy - Su br tont.(.. uncu.rstand.Qro.
~,J,1ct t'hon'1 ,(olu.)O~~-rve.')
•smallerjump bet-wun Qnthal ... '"'e 1. ic_ YQOCh on be comes Q'. 110Je. the. 1irn1i ations Of motdn.9
~Olld 411q,ui d t-han ch Ong:~ . ?Km) p. c~ ropy fQo 1 b I e, by (), ssum t n p~Qd.lchon.s 060\.!t µo.si b i , i _y baled on d G-
ti g QJ ai
I iquid-, JUrro d-' ange c.G CO 9 I\. tetitnon muy beve1~to,v
1 un in g1 Of HJ Hel'Y) •
lso1id Porn'U~! nr~ \.l<'JK -riiol -1) { (jK-1 -•) u lm-9erVQ/tu.
t
1-..
becom1n9 m v.cn di . moL Shows rQa.c:ti'on
0
1- ; >1Y1e 1nn9 /YI or e d f:rnrcu..re.d.. . fi~1~~f 0
goes to comp1et1on
r l/ . N 2 (9) /- 3 Hz (9) -> 2N H J cg)
G l em p. ( K) produc~·on Of. g a.s 1ncreaJes the. 4 more rn ci le 1 Of g cH on r~ act ant
fd1sorderof thepa;c.w side :. dlJorc.ler fv;rc, ·-'>,fil.k en1-ropy
I -
CaC 03 (j) f 21--/CA.(l<I() --} CnU.1..u.,qJ t- (0,{y) fl-l;_Ou) e.nergyl'smort chon..9e.. deC,
Spread out and t.S lrn1P
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 leilasayshi. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.86. You're not tied to anything after your purchase.
