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Misert Draw Design Layout References Mailings >> Share Comme Times New... 16 A A Aa Ao BI U rab x X² AvovArt Paragraph Styles Sensitivity 3. Adjust the temperature for an endothermic reaction. Then adjust the temperature for an exothermic reaction. What happens? Sign of AH / When T'increases, K... When I decreases, K... Positive (endothermic) Negative (exothermic) a. Write the chemical equation for the endothermic reaction when An = 0. Is heat a reactant or a product? b. Write the chemical equation for the exothermic reaction when An = 0. Is heat a reactant or a product? c. How does an endothermic reaction shift to regain equilibrium after an increase in temperature? Explain this in terms of Q versus K and also in terms of "reducing stress" after a change in a reactant or product. d. How does an exothermic reaction shift to regain equilibrium after an increase in temperature? Explain this in terms of versus K and also in terms of "reducing stress" after a change in a reactant or product.

Answer 1

soution suppose a chenical reaction do not undera Completion even though favourable experimental Conditions are maintained. The reaction proceeds to some extent & stoje virtually. The observable properties of the system do not change with time when this state is attained. This is called Chanical equilibrium For gas phase Chanical reaction. (-1) A+ (-22) Az = 0 g Azt Uuty Ž Si Ai=0 tvice rith speeen a ne Change in amant reactent as a product duiring the preagress of reaction in terms of adhancement of reaction as extent of reaction (6) wrich is defined nilt) = ni(0) + vi&e [ris amount of dni z öt Vide a dni-vide 7 - - (1) - from Gibbs Dutem equation, we know, do = vap- sdt + Ź Midni (@GeT = Midni Ĉ Mi (video) (@G PT - T- ist on Sini @ . 4 D65 (25) er free energy charge during

Go standard reactica potentical each of the gaseous reactants & products has partial pressure of I bar at teup (t). It is temp debendent but pressure independent. Si - thermodynanic eam. ka = ņ (1) eam constant. since (a) = activity is adimension Less ka is also dimension lees. (26) = ² Willi = (BG) put quentity ,ka (DS) PT = Ž Viki - 2 (Mit RT hai) Di = I di MotRToi? Inai - ² sini + RT 2 nauji AGO + RT en A Cum se (AG) PT = - RT Inkat RT m (..) la di- ga= quixa2 2 1) (a.) ; _ga= axaju ... - activity quotient quantity during reaction de elna la is a variable quantity a reaches a fixed value at cam w Composition of the sys

T = ~RT Ka ART hos al avan't Hoff's Reaction isotherm The above egn is known state of egon Cherical Now, for Qa=1 equilibrium, OrGeTa G = -RT Inka :: Phot –RT lnka .. :: Inka - , - Dr Go : Inka = - RT logo Olkal 27 ) 25 R L at Hon Az Hao A from Gibb's Helim holtzean, racon/T) 7. I T JP & for Standard state like I DoHo. So, for exothermic reaction, Drittore

Ta luke] =(-ve) with increase in Tarpocature, kp decreases & vice versa. endothermic Dr Ho - the of i with increase in temperature ke increases & vice versa. so I when I inveceses, KI w decreases, e increases decreases sign of PH the endotherway I ineresses decreases -re (extremic Ans 1 a) Let us cander à homogeneous gas pure reaction, Alt data= Os Az & Scity i By defination, kp = (P X (po males, PranRT 7 for ideal gas of 4 te Kp = por (Camp)"x (RTU

- Kel CORT) Po So, kq=ke (CoRT I AM so kp=ke o I CORT Po .: In up = like to ako atos In enke enkp- od ln(ORT) luke? T 2 likel- 2 T - Orto = RT² Arto PORT RT it as Now (@) now if Ad=an = of it end that has a hic Dirett-tve so if Temperature increases cam canst value increases. So, heat the reactant)

if exothermic mit 27 on=D=0 Dr Hoove so, if teup inereeses so, T inerenes so RT² Blake] increases. but Dr Ho-ve, so with increases teup eam constant value decreases. (so Heat the product) like As, 7 te Dr Ho at p = RTZ Lauzo RTZ I to A HO - ahnke - Ar Ho R w 055 so, for exothermic T yield decreases so for endothermic yield inereases inveases / derens ke decreases T increases I decress ke i Lene Art Now, dlnko dT RT 2 1 Orto hapa R2 + Const brkp e t IT now, stress, Coreept of rediceing