Question

6. Which of the following statements is not true? A) Bond breaking is endothermic. B) The bond dissociation energy for bond breaking is always negative. C) Bond making is exothermic. D) The bond dissociation energy for bond formation is always negative. 37. Using the bond dissociation energies given, calculate AH® for the following reaction. CH,CH -Br + H2O CH,CH-OH + HBr AH KJ/mol Bond A-B CH3CH2-Br H-OH сHCH-он H-Br A) +108 KJ/mol B) -130 KJ/mol C) -22 KJ/mol D) +22 KJ/mol 38. Which of the following statements about the equilibrium constant, Keq, is true? A) When Key >1, the equilibrium favors the reactants. B) When Key <1, the equilibrium favors the products. C) The size of Keq tells about the position of equilibrium. D) For a reaction to be useful, the equilibrium must favor the reactants. 39. Which of the following expressions summarizes the correct relationship between the free energy change, AG", and the equilibrium constant, Ke? A) Keq> 1 when AG° >0 B) Keq> 1 when AG° <0 C) Kg <1 when AGⓇ <0 D) Keq <1 when AG° = 0 40. Which of the following statements is true? A) The size of the activation energy tells us about the reaction mechanism. B) The size of the activation energy tells us about the reaction rate. C) A slow reaction has low activation energy. D) A fast reaction has large activation energy.

Answer 1

DAY 233-132 WEEK 34 August 2010 21 D 2902 wanan IMPORTANT SATURDAY (36) (B) Boud dissociation energy for 900 (37). CH 3 CH ₂ By + H₂O CH₂ CH ₂ OH + H Br now. The coachion (; (HB)+ ahjcmcmor)] - From given dator lah Cenzen Bo) + 4h (mo] (365+ 893)-(285+498) W ? – 22 kyfint → © 39 38 4 - V 21 . I & The size of Reg tells about 300 the position of the equilibrium. because, AGO RT liker (39) ② keq > When AGRO 27 DN 243 Wekt because 44 = -RT lnkeg. 140 (B). The size of the activation energy tells about the reaction rate. SUNDAY