7/25/2019 Block Test for Module 3 H2 Chemistry Paper

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Block Test for Module 3 H2Chemistry Paper, Paper 2

Pyridine was discovered in 1849 by the Scottish chemistThomas Andersonas one of the

constituents ofbone oil.Two years later, Anderson isolated pure pyridine throuh fractional

distillationof the oil. !t is a colorless, hihly flammable, wea"ly al"aline, water#soluble li$uid with a

distinctive, unpleasant fish#li"e odor.

a) (i) Dee ethalpy cha!e of atomi"atio(ii) #$perimetally the ethalpy cha!e of atomi"atio of pyridie %as foud

to &e'3 k* Mol+-rite a e.uatio to represet it

&) /si! rele0at &od eer!y data from the data &ooklet, calculate aother

0alue for the ethalpy cha!e of atomi"atio of pyridiec) -rite a e.uatio to represet the ethalpy cha!e of com&ustio of pyridied) -he 3! of pyridie %as com&usted i a calorimeter, the procedure

heated 11! of %ater from 2 1C to 1C This is process %as ko% to &e

45 e6ciet Calculate the ethalpy cha!e of com&ustio of pyridie(7pecic heat capacity of %ater8 921 * ! +:+)

The decompositio of hydro!e pero$ide is a rst order reactio

a) (i) -hat is meat &y the term ;order of reactio< = mark>(ii) Ho% lo! %ill it take for a 5 of a sample of H212to decompose =2

marks>

&) The decompositio of H212 ca &e cataly"ed &y &romide ios The rate

e.uatio is 8?ate@ k=H212>=Br+> Ai0e a 2 step mechaism i0ol0i! Br+ as a

itermediate that is cosistet %ith this rate e.uatio =2 marks>

c) odide ios are o$idi"ed i acid solutio &y hydro!e pero$ide

https://en.wikipedia.org/wiki/Thomas_Anderson_(chemist)https://en.wikipedia.org/wiki/Thomas_Anderson_(chemist)https://en.wikipedia.org/wiki/Dippel's_oilhttps://en.wikipedia.org/wiki/Dippel's_oilhttps://en.wikipedia.org/wiki/Dippel's_oilhttps://en.wikipedia.org/wiki/Fractional_distillationhttps://en.wikipedia.org/wiki/Fractional_distillationhttps://en.wikipedia.org/wiki/Dippel's_oilhttps://en.wikipedia.org/wiki/Fractional_distillationhttps://en.wikipedia.org/wiki/Fractional_distillationhttps://en.wikipedia.org/wiki/Thomas_Anderson_(chemist)

7/25/2019 Block Test for Module 3 H2 Chemistry Paper

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(i) 7tate 3 coditios that determie %hether a reactio %ould occur

%he molecules collide =3 marks>(ii) ssumi! the rate of the a&o0e reactio is "ero order %ith respect to

=H'>, determie the order of reactio %ith respect to =H212> ad =>&ased o the e$perimetal results sho% &elo% Hece determie the

rate costat for the reactio ( ssume order of reactios %ith

respect to H22 ad are positi0e ite!ers) =9 marks>

#$pt Eum&er =H212> =+> itial ?ate mmoldm+3s+

11 112 112 112 113 1293 113 119 19

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

CCCCCCCCC