Slide 1 / 38 1 A burning splint will burn more vigorously in pure oxygen than in air because oxygen is a reactant in combustion and A concentration of oxygen is higher in pure oxygen than is in air. B oxygen is a catalyst for combustion. C oxygen is a product of combustion. nitrogen is a product of combustion and the D system reaches equilibrium at a lower temperature. nitrogen is a reactant in combustion and its low E concentration in pure oxygen catalyzes the combustion. Slide 2 / 38 2 As the temperature of a reaction is increased, the rate of the reaction increases because the __________. A reactant molecules collide less frequently reactant molecules collide more frequently and B with greater energy per collision C activation energy is lowered reactant molecules collide less frequently and D with greater energy per collision reactant molecules collide more frequently with E less energy per collision Slide 3 / 38 3 Which of the following will not affect the rate of a chemical reaction? A increasing the concentration of a reactant B decreasing the concentration of a reactant increasing the temperature at which the C reaction is carried out performing the reaction in the presence of a D catalyst All of the above will affect the rate of a chemical E reaction.
Slide 4 / 38 4 A reaction was found to be first order in carbon monoxide concentration. The rate of the reaction __________ if the [CO] is doubled, with everything else kept the same. A doubles B remains unchanged C triples D increases by a factor of 4 E is reduced by a factor of 2 Slide 5 / 38 5 A reaction was found to be second order in carbon monoxide concentration. The rate of the reaction __________ if the [CO] is doubled, with everything else kept the same. A doubles B remains unchanged C triples D increases by a factor of 4 E is reduced by a factor of 2 Slide 6 / 38 6 If the rate law for a reaction is first order in A and second order in B, then the rate law is A k [A][B] k[A] 2 [B] 3 B k[A][B] 2 C k[A] 2 [B] D k[A] 2 [B] 2 E
Slide 7 / 38 7 A reaction was found to be third order in A. Increasing the concentration of A by a factor of 3 will cause the reaction rate to __________. A remain constant B increase by a factor of 27 C increase by a factor of 9 D triple E decrease by a factor of the cube root of 3 Slide 8 / 38 8 It was experimentally determined that the rate for the reaction (A + B ↔ P) increased by a factor of 9 when the concentration of B was tripled. The reaction is _____order in B. A zero B first C second D third E one-half Slide 9 / 38 The rate law for a reaction is rate = k[A][B] 2 Which 9 one of the these statements is false? A The reaction is first order in A. B The reaction is second order in B. C The reaction is second order overall. D k is the reaction rate constant If [B] is doubled, the reaction rate will increase E by a factor of 4.
Slide 10 / 38 10 The rate law of the overall reaction A+B ↔ C Is rate=k[A] 2 Which of the following will not increase the rate of the reaction? A increasing the concentration of reactant A B increasing the concentration of reactant B C increasing the temperature of the reaction D adding a catalyst for the reaction E All of these will increase the rate. Slide 11 / 38 11 Which energy difference in this energy profile corresponds to the activation energy for the forward reaction? A x B y C x+y D x-y E y-x Slide 12 / 38 12 In the above drawing, what quantity is represented by the sum of x + y? A heat of reaction, DH B activation energy of the forward reaction C activation energy of the reverse reaction D potential energy of the reactants E potential energy of the products
Slide 13 / 38 13 In the above drawing, what quantity is represented by “ y” ? A heat of reaction, ΔH B activation energy of the forward reaction C activation energy of the reverse reaction D potential energy of the reactants E potential energy of the products Slide 14 / 38 14 In the above drawing, what quantity is not affected by the presence of a catalyst ? A x B y C Neither x nor y Both x and y are affected by the presence of a D catalyst. Slide 15 / 38 15 In the energy profile of a reaction, the species that exists at the maximum on the curve is called the __________. A product B activated complex C activation energy D enthalpy of reaction E atomic state
Slide 16 / 38 16 A catalyst can increase the rate of a reaction __________. by lowering the activation energy of the reverse A reaction by increasing the overall activation energy (Ea ) B of the reaction by providing an alternative pathway with a C lower activation energy All of these are ways that a catalyst might act to D increase the rate of reaction. Slide 17 / 38 17 At equilibrium, __________. A all chemical reactions have ceased the rates of the forward and reverse reactions B are equal the rate constants of the forward and reverse C reactions are equal D the value of the equilibrium constant is 1 E the limiting reagent has been consumed Slide 18 / 38 18 Which of the following expressions is the correct equilibrium-constant expression for the reaction below? (NH 4 ) 2 Se (s) ↔ 2NH 3 (g) + H 2 Se(g) A [ NH 3 ] [H 2 Se] / [NH 4 ) 2 Se ] [NH 4 ) 2 Se ] / [ NH 3 ] 2 [H 2 Se] B C 1/ [NH 4 ) 2 Se ] [ NH 3 ] 2 [H 2 Se] D [ NH 3 ] 2 [H 2 Se] / [NH 4 ) 2 Se ] E
Slide 19 / 38 19 Which of the following expressions is the correct equilibrium-constant expression for the reaction below? HF (aq) H 2 O(l) ↔ H 3 O + (aq) + F- (aq) [HF][ H 2 O]/ [H 3 O + ][F - ] A B 1/HF [H 3 O+][F - ] / [HF][ H 2 O] C [H 3 O + ][F - ] / [HF] D E [F-]/[HF] Slide 20 / 38 20 The equilibrium constant for the gas phase reaction N 2 (g) +3H 2 (g) ↔ ( 2NH 3 (g) is Keq = 4.34x10 -3 at 300 0 C. At equilibrium_______. A products predominate B reactants predominate roughly equal amounts of products and C reactants are present D only products are present E only reactants are present Slide 21 / 38 21 The equilibrium constant for the gas phase reaction 2NH 3 (g) ↔ N 2 (g) +3H 2 (g) is K eq =230 at 300 0 C. At equilibrium, _____________ A products predominate B reactants predominate roughly equal amounts of products and C reactants are present D only products are present E only reactants are present
Slide 22 / 38 22 Which of the following expressions is the correct equilibrium-constant expression for the equilibrium between dinitrogen tetroxide and nitrogen dioxide? N 2 O 4 (g) ↔ 2NO 2 (g) A [ NO 2 ] /[ N 2 O 4 ] [ NO 2 ] 2 / [ N 2 O 4 ] B [ NO 2 ]/ [ N 2 O 4 ] 2 C [NO 2 ][N 2 O 4 ] D [ NO 2 ] 2 [N 2 O 4 ] E Slide 23 / 38 23 The equilibrium-constant expression for the reaction Ti(s) + 2Cl 2 (g) ↔ TiCl 4 (l) is given by A TiCl 4 (l)/ [Ti(s)] + [Cl 2 (g)] [Ti(s)] [Cl 2 (g)] 2 / [ TiCl 4 (l)] B [ TiCl 4 (l)] / [Cl 2 (g)] 2 C [Cl 2 (g)] -2 D [ TiCl 4 (l)] / [Ti(s)] [Cl 2 (g)] 2 E Slide 24 / 38 24 Consider the following equilibrium. 2SO 2 (g) + O 2 (g) ↔ 2SO 3 (g) The equilibrium cannot be established when __________ is/are placed in a 1.0-L container. A 0.25 mol SO 2 and 0.25 mol O 2 B 0.75 mol SO 2 C 0.25 mol SO 2 and 0.25 mol SO 3 D 0.50 mol O 2 and 0.50 mol SO 3 E 1.0 mol SO 3
Slide 25 / 38 25 If the value for the equilibrium constant is much greater than 1, then the equilibrium mixture contains mostly __________. A reactants B products Slide 26 / 38 26 Pure __________ and pure __________ are excluded from equilibrium-constant expressions. A gases and compounds B solids and liquids C liquids and elements D ions and molecular compounds E Acids and bases Slide 27 / 38 27 Pure _____ and pure _____ are excluded from equilibrium-constant expressions. A gases and compounds B gases and liquids C liquids and elements D ions and molecular compounds E Acids and bases
Slide 28 / 38 28 Of the following equilibria, only __________ will shift to the left in response to a decrease in volume. A H 2 (g) + Cl 2 (g) ↔ 2HCl (g) B 2SO 3 (g) ↔ 2SO 2 (g) + O 2 (g) C N 2 (g) + 3H 2 (g) ↔ 2NH 3 (g) D 4Fe(s) + 3O 2 (g) ↔ 2Fe 2 O 3 (s) E 2HI (g) ↔ H 2 (g) + I 2 (g) Slide 29 / 38 29 The reaction below is exothermic: 2SO 2 (g) + O 2 (g) ↔ 2SO 3 (g) Le Chatelier's Principle predicts that __________ will result in an increase in the number of moles of SO 3 (g) in the reaction container. A increasing the pressure B decreasing the pressure C increasing the temperature D removing some oxygen E increasing the volume of the container Slide 30 / 38 30 For the endothermic reaction CaCO 3 ↔ CaO (s) + CO 2 (g) Chatelier's principle predicts that __________ will result in an increase in the number of moles of CO 2 . A increasing the temperature B decreasing the temperature C increasing the pressure D removing some of the CaCO 3 E none of the above
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