Chemistry equilibrium, Cheat Sheet of Law

Download Chemistry equilibrium and more Cheat Sheet Law in PDF only on Docsity! AP Chemistry Name ZLB Ch. 13: Chemical Equilibrium Review \2> Date Le Chatelier’s Principle Question 1.Consider the following reactions at equilibrium and determine which of the indicated changes will cause the reaction to proceed to the right. are, 1) CO(g) +3 By(g) == CHi(g)+1L0(g) @emove CO) &— 2) CO.(g) + C6) = 2 COfe) (add COz) 7 3) Na(g) +3 Ha(g) == 2NHg(g) (add nitrogen) —> 4) 2 CO2(g) = 2 CO(g) + O2(2) (add CO) <—— 5) CO(g) + 2Eh(g) = CH;OH(g) (remove CH;OH) ——> a) 2,4 b} 3,4 (0) 3,5 a 1,4 e) 2,3 Question 2. Consider the following reactions at equilibrium and determine which of the indicated changes will cause the reaction to proceed to the left. 1) 2 HO(g) = 2 Ho(g)+O.(g) (kemove water vapor) ——— 2) Hh(g) + 1o(g) = 2 HI(g) (remove Hl) =~"? 3) CaCO3(s) =* CaO(s)+ CO.(g) (add CO):) <7 4) No(g) + O2(g) == 2 NO(z) {add 0.) +7 Eel: { 5) BaO(s) +803(2) = BaSOx(s) (add BaSO,) ajo charge! woticls | ‘a) 3,4 b) 13,5 c) 2,4 ad) 2,5 L3 Question 3. Consider the following reactions at equilibrium and determine which of the indicated changes will cause the reaction to proceed 16 the right. 1) CO(g) + 3 He(g) S* CHa(g}+H2O(g) — (remove HO vapor) —-> 2) No(g) +3 Ha(g) = 2NBG(e) (add NH) ~~ ‘ 3) Hg) + Fa(g) =* 2 HE(g) (add HF) <—~ 4) No(g) + 2 Ox(g) 2NOx(g) (remove NOQ,) —-> | obec | 5) BaQ(s) + SO3(g) == BaSOu(s) (add Bed) Ne charge 6 Soe a) 2,3 b) 23,5 a) 1,4,5 2) 3,5 Question 4. Consider the following reactions. In which cases is s is product formation favore formation favored by increased temperature? NO bah Nob, I)NAg) +3 1H) 2 2NI(@) ABT =-91.8 11 phd ha fe 3 2)2. COx(g) = 2CO)+ 01g) AH? “56610 “Gen. _ Le 3) CO(g) + 2Ha(g) 2 CH,OH(@) AH?=-21.71d “ x 4)Ni@)+ Ox) = 2NO@) AH? “igig T bie 5) Hole) + Fa(e) 2 2HF(Q) AEP sai id b) 3,5 c) 1,3,5 a 1,3 8) 5 remperture?. 1yCO(e) +3 Hale) <2 CHY(g)+E2O(@) AR? = 206.210 YCO(g) + 3 Th(g) Ha(g) + H20(g) 2062 2) COx(g) + C(s) F* 2 COLE) AH? = 172.5 k} at 3) Bo(g) + L(g) = 2 He) AH? = 9.4K ae « Aion: ae J 4) 3 Ong) & 2 Os(g) AHP =285 kt Se 5) 2 H,0(g). = 2 Hy(g) + O2(e) ABD = 484.6 kt a) 2,4,5 b) 3,5 J 1,3 ad) 1,4 e) 1,2and5 Question 6. . Consider the following reactions. In which cases is the product formation favore “bamation favored by decreased temperature? va ~ No a 1) CO.(g)+C(s) S2 2CO(~) —- AH®= 172.5 Be +o. N: 3 Hag) = 2. NH: AH? =-91.8k7 2) No(g) + 3 Bag) = a(e) LBs a = bhyve 3) CO(g) +2H2(g) = CHOH = =AH?=-2L. 72k ~ vO 4) No(g) + O2(g) 2 2NO(g) AB? = 181 kT ae 5) 2 HjO(g) S* 2 He(g)+ On(g) AH? =484.6k5 . , b) 3,4 c) 1,4,5 d) 2,4 e) 3 Question 13. Ifthe yn a reaction flask for the following ing system is is increased by decreasing the volume, what will happen to the concentrations of CS; and CHy? 6 Re if to ple Zar CS2(g) + 4 Hale) > CHalg) + 225S(@) Ss” an Cee Se a) both the [CS,] and [CH,] will decrease 7 Sree les, b) neither the [CS.] nor the [CH] will change c) both the [CS2] and [CH4] will increase the [C52] will decrease and the [CH4] will increase c) the [CS] will increase and the [CH] will decrease Question 14. Which of the following changes in conditions will result in the more rapid establishment ye an equilibrium? . fr gh oe «eS 1) the use of only stoichiometric amounts of reactants 2) the addition of an catalyst 3) adecrease in the temperature 4) an increase in the temperature 5) a deerease in the concentration of the reactants “ay, 2 Coa4) o)4 ad45 e)2 Quéstion 15. For the photosynthesis reaction shown below, AH°= +2816 kJ ( bende ec cores ce) 6COXg) + 6H,OW % CsHi0s(3) + 6Oxig) (tink Pech exe pet & Use the following options to answer the questions below: ih Me. (ete as ) (A) Shift to the right towards the products (B) Shift to the left towards the reactants att . 7. 2 (C) No effect on direction of reaction 2 f, the ne@ “ “sg He Gee © How is the equilibrium yield of CHa) affected by: a) increasing Poo? ? A ‘ b) increasing temperature? fe be. c) removing CO2? 2 ., d) increasing the total en bag & . No ef fret on qt Pe” j ‘hack e. e) adding more HO? C_( bguicde) a x Eovme as # ‘rob = e f) removing some ace! Cc (Go Elias i) / (rete fe) g) adding a catalyst? Xe jeby & de fet only 7 fou fo psn. Hapypen: Questions 16-18: Relate to the equilibrium: 2POCIs(g) S 2PChi(g) + 02g) AHixn = +508 kJ. Use the following options to answer the questions below: CBr, 647, (A) The equilibrium will not shift in either direction. (B) The equilibrium will shift to generate more products. (C) The equilibrium will shift to generate more reactants. Question 16. How will the equilibrium of the reaction shift if, POCI3 is added to the reaction vessel? Question 17. How will the equilibrium of the reaction shift if heat is added to the reaction vessel? r heat 1s added Ans.: B Erol, Tf Froolack f Question 18. How will the equilibrium of the rxn. shift if pressure on the reaction vessel is increased? Ans: pr ren. obifh Powarls ese gar ron Ce. Question 19. For the endothermic reaction CaCO3(s) > CaO(s) + CO>(g), which of the following actions would favor the shifting of the equilibrium position to form more CO2 gas? increasing the system temperature b) increasing the system pressure c) both decreasing the system temperature and increasing the system pressure d) increasing both the system temperature and the system pressure e) decreasing the system temperature Question 20. A chemical system is at equilibrium when a) the rate of the forward reaction becomes zero. b) the rates af the forward reaction and the reverse reaction are both zero. c) the concentration of reactants and products.are equal. f (athe rates of the forward reaction and the reverse reaction are equal. e). all of the reactants have been used up. hr alays &, oncen L, fion a peaodarh € products iy Conlon aPber epi Ge vuom efhdsbeot