Chapter 5: Thermodynamics Worksheet With Answers - Ap Chemistry 2015-2016 (Page 9 of 14) in pdf

Chapter 5: Thermodynamics Worksheet With Answers - Ap Chemistry 2015-2016 Page 9

I c an…

§ state t he s ign o f Δ H b ased o n o bservation o f w arming o r c ooling o f t he s urroundings.

§ correctly a pply t he t erms e xothermic a nd e ndothermic t o s ituations w here t he s urroundings a re

warming o r c ooling.

Measuring H eat

§ state t he u nits o f h eat c apacity, s pecific h eat, a nd m olar h eat c apacity a s w ell a s t he s ignificance o f e ach.

§ use c alorimetry ( q=mCΔT) t o c alculate h eat c hanges d uring t emperature c hanges.

§ calculate t he h eat t ransferred w hen t wo o bjects, a t d ifferent t emperatures, c ome i nto c ontact.

Energy = H eat a nd W ork

§ state t he d ifference b etween w ork a nd h eat e nergy.

§ state t he d ifference b etween s ystem a nd s urroundings.

§ recognize t he s ystem a nd t he s urroundings i n a c hemical o r p hysical s ystem.

§ calculate t he c hange i n i nternal e nergy b ased o n c hanges i n h eat a bsorbed b y t he s ystem a nd w ork

done b y t he s ystem.

§ state t hat Δ H i s a m ore g eneral ( and u seful) m easure o f e nergy t han Δ E a nd t hat Δ H = q w hen a r eaction

occurs a t c onstant p ressure.

Chemical W ork = E xpanding G ases

§ relate p hysical w ork ( w=F·d) a nd c hemical w ork ( w=-‐‑ P ·ΔV).

§ calculate P V w ork d one b y a n e xpanding g as.

§ state t hat n o w ork i s d one i n a c onstant v olume s ituation s uch a s a b omb c alorimeter.

Calculating Δ H -‐‑ -‐‑ H ess’s L aw

§ state t he d efinition o f a s tate f unction.

§ list e xamples o f p roperties t hat a re a nd a re n ot s tate f unctions.

§ write t he e quation f or t he h eat o f f ormation o f a s ubstance.

§ state t hat t he h eat o f f ormation o f a n e lement u nder s tandard c onditions h as a v alue o f z ero.

§ use H ess’s L aw t o c alculate t he e nergy o f a c hemical o r p hysical c hange.

(g) + 2 H

(g) -‐‑ > C

(g)

Information about the substances involved in the reaction represented above is summarized in the

following t ables.

Substance

DH°f

(kJ/mol)

(g)

226.7

(g)

-‐‑ 8 4.7

(a)

Write t he e quation f or t he h eat o f f ormation o f C

(g)

2C ( s) + 3 H

( g) → C

( g)

(b)

Use t he a bove i nformation t o d etermine t he e nthalpy o f r eaction f or t he e quation g iven.

-‐‑ 3 11.4 k J

Chapter 5: Thermodynamics Worksheet With Answers - Ap Chemistry 2015-2016 Page 9

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