· [HCI]

[Cli]

Chemistry 12 In Class Assignment

EQUILIBRIUM /31

• • I

Name:~

Block:~

1. U~ing the below equilibrium system, Complete the following equilibrium .graph given the . . , . , ..

I·

i

stresses indicated · · (4 marks)

,

4 HCI 111 + 2 Oz Iii +:! 2 HzO 111 + 2 Clz Iii + 98 kJ

~

r--..

inc.

press.

I\....

/

dee.

temp.

~

V

I'---.

Add more Cb

~ v--

I',..._

remove HCI

2. Explain why a syringe containing N02 gas wlll first get darker then lighter in colour when

compressed (when volume is decreases). Use the equillbrium equation : (2 marks)

tu\..cAJ.~~,v ( wvow't'\) N204 111 + energy +-+ 2N02111

V\)W,,1/\ ~, 1,..,,e 1' gJA_ ~ c,, J \ -M-~to.,-11:j + : • . ~ V'MJ\-e..c.. & NUJ w\,..te,\,,,. \.~ 'oVOIJJ"' ,V\ (>... ~\N'alltv vol . ✓cl.f,f,yfLJ.v

¼.,-eV\ ~h•t"t to 4&\(U v1\ tiM> °r' W'Ole C · 1 l-~ f+ f C AJ0"-1 ~,l I olJ.w-eo.~ <§ C\/\J1-~.J w\ll 1- ·. · wi I/ Of;/ l~_,hfev-•

3. Given the following equilibrium system, state which way the equilibrium will shift when the changes below are made (7 marks)

2C2H6(g) + 702(g) ~ 4C02(g) + 6H20(g) + heat

a) The volume of the container is halved ..................... Answer L-. \ ~ b) The temperature is decreased ................................. Answer

c) CO2 is added to the container .................................. Answer ~

d) The total pressure is increased ............................... Answer L e) 02 gas is removed from the .svstem ....................... : Answer L-

. f) Neon gas is added to increase' the total pressure ..... Answer Y\Q $hLk h) A catalyst is added ........ .. ........ .... ............................ Answer '60 ~i{l,(f

4. For each of the following, determine whether there is no reaction (NR), the reaction

goes to completion {C), or equilibrium is established (E). (3 marks)

a},8G(+ 02181 ⇒ S02181 ~H = -297kJ Y\O ~,rl.e, --=?, ei\~\f4 ~ re ~,; c... J

~\) \~,w.c!

b) 2Na1s1 + Cb181 ⇒ 2NaC11s1 + 96kJ --,,--~o

(V\()r( ~ ) -'

c) C2H2(g) + Ca(OHh(aq) + energy ⇒ CaC2(s) + 2H20111

e-<:() ~

r,wye,~ k--

C.

.,

s. Write the Keq expression for the following equlllbrla (1 mark each):

6. Consider the following equilibrium:

C011l + 2H2111 <=:> CH30H11l

\C£.ct :: C. llio "11-, - rr½,1 1

Keq = 2.4 at 20°c

Keq = 0.34 at S0°C

Is the reverse reaction endothermic or exothermic? Explain. (2 marks)

- \,:..a.'\ k~~'"': : . -re~ -frw Ov' (d

- \-cVV''f · 1' ' ~ ,t- ~rt'~· ~Kf-1{ e~? . - .· . .. re.vevSl ·1s· et1ttlo-

CJhJtf- L)

7. Consider thEdollowing equilibrium: • . . ~ '\ \'X- l -· OV\. 'j ~ H2(a) + -C'2lll <=> 2HCllll Keq _= 6.55 1

At equilibrium, [H2] ~ 0.0125M and [Ch].= 0.018M. What is [~11 at equilibrium?

(2 marks)

\£.t-r- \)ic.131. ~ b '.\t; (!lu )L [~)(cl,i,1 (_o.0\2-\'X o.01~)

JG;.,\;. ~ (_b S~ )( D, C 11.. "i ')( O.O \ "fl) . l Cl-K.\_1 ::. O . o?,8 \'\)

8. a) Chemical system's tend toward positions of rf\M M ·, V\ entropy. (1 mark)

enthalpy and

b) Why? (1 ~ark)

- ec..r, er fo lv¥ -j+ah r/ (\ .ere,,-J J .. - m~ ths fY&Ur-€d 6-/t:t·kr -/'kin I),.~ ~ft S

I

9. Consider the following equilibrium:

2N0111 + Bri111 <=> 2N0Br111 Keq = 1.00 X 102

An unknown amount of NOBr is placed in a 2.00L container. At equilibrium, [Br2] =

0.0400mol/L. Calculate the moles of NOBr initially placed in the container.

(4 marks)

c +o.o~oo

( o.u~oo

NOi NtJ'" :: o ,2,1-IO~ 2al-

[?. 460 nu>)\

10. Consider the following equilibri'um:

2H20181 <=> 2H2181 + 02181 Keq = 0.45

1f:t£ mol H20, _E mol Hz, and ~ mol ~2 a_re introduced into a 5.0L closed flask, what

will ~ ppen to .th1 [Hz~] as the sy~ em moves toward equilibrium?

' + (3 marks)

~ ~~ ~ l~-\L~ 02.~

1/,al ~ :; Cll-iY· [_{)2.-z_J -::Jo~) - o. ,"l'i ~lo \J{~ ~] Lo· ttD)

+r:-,c:tl ~1

o .'{D L Ci.cJvo-1 faJ1 b.lf\ .'. NdS

it> 5h:.ft 12. fo air/4: r1 ~ 01,V)i C l-1,._o] w°JI -t,