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26) How does a catalyst increase the rate of a chemical reaction? a) By changing the magnitude of the enthalpy change. b) By providing a pathway for the reaction that has a lower activation energy. c) By decreasing the potential energy of the products d) By increasing the potential energy of the reactants

26) How does a catalyst increase the rate of a chemical reaction? a) By changing the magnitude of the enthalpy change. b) By providing a pathway for the reaction that has a lower activation energy. c) By decreasing the potential energy of the products d) By increasing the potential energy of the reactants

Chemistry
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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21) 22) 23) 24) 25) 26) 27) Which one of the following statements is true at constant pressure and temperature? a) AH = AE - PAV. c) AH = AE+RTAng The enthalpy can be defined as a) H= AE + PV c) H=E+ PV What is the entropy of the following arrangement (3 left and 1 right) in the box having four molecules? KB= 1.38×10-23 J/K, a) 1.91x10-23 J/K c) 8.56×10-23 J/K 28) Calculate boiling point of a liquid, 16 J/mole? a) 273 K b) AE=AH+PAV d) AE=AH+RTAng b) H= E + APV d) H=E-PV b) 9.42×10-23 J/K d) 1.56×10-23 J/K enthalpy of vaporization is 6 KJ/mole and entropy change c) 375 K abs d) 273 °C b) 375 °C Consider the hypothetical reaction: X(g) + 2Y(g) →→ XY2g), A[Y] At What is the rate of formation of XY2(g) a) 5.0 x 10-2 mol L-¹ sec¹ c) 1.0 x 102 mol L¹ sec¹ =-5.0x102 mol.L'.sec¹ Which is the correct rate law? a) ratek [A] [B] c) ratek [A] [B] b) -2.5 × 10-² mol L-¹ sec¯¹ d) 2.5 × 102 mol L-¹ sec¹ How does a catalyst increase the rate of a chemical reaction? a) By changing the magnitude of the enthalpy change. b) By providing a pathway for the reaction that has a lower activation energy. c) By decreasing the potential energy of the products d) By increasing the potential energy of the reactants The rate of a chemical reaction will be increased by all of the following factors EXCEPT a) the presence of a high activation energy c) an increase in temperature For the next 3 questions, use the proposed mechanism for a given chemical reaction shown below. Step 1: A + B F (fast) Step 2: F+ A C+ G (slow) Step 3: G+ AC+D (fast) b) the presence of a catalyst d) increasing the concentration of the reactant b) rate=k [A] [B] [F] [G] d) rate = k [A] [B]
Transcribed Image Text:21) 22) 23) 24) 25) 26) 27) Which one of the following statements is true at constant pressure and temperature? a) AH = AE - PAV. c) AH = AE+RTAng The enthalpy can be defined as a) H= AE + PV c) H=E+ PV What is the entropy of the following arrangement (3 left and 1 right) in the box having four molecules? KB= 1.38×10-23 J/K, a) 1.91x10-23 J/K c) 8.56×10-23 J/K 28) Calculate boiling point of a liquid, 16 J/mole? a) 273 K b) AE=AH+PAV d) AE=AH+RTAng b) H= E + APV d) H=E-PV b) 9.42×10-23 J/K d) 1.56×10-23 J/K enthalpy of vaporization is 6 KJ/mole and entropy change c) 375 K abs d) 273 °C b) 375 °C Consider the hypothetical reaction: X(g) + 2Y(g) →→ XY2g), A[Y] At What is the rate of formation of XY2(g) a) 5.0 x 10-2 mol L-¹ sec¹ c) 1.0 x 102 mol L¹ sec¹ =-5.0x102 mol.L'.sec¹ Which is the correct rate law? a) ratek [A] [B] c) ratek [A] [B] b) -2.5 × 10-² mol L-¹ sec¯¹ d) 2.5 × 102 mol L-¹ sec¹ How does a catalyst increase the rate of a chemical reaction? a) By changing the magnitude of the enthalpy change. b) By providing a pathway for the reaction that has a lower activation energy. c) By decreasing the potential energy of the products d) By increasing the potential energy of the reactants The rate of a chemical reaction will be increased by all of the following factors EXCEPT a) the presence of a high activation energy c) an increase in temperature For the next 3 questions, use the proposed mechanism for a given chemical reaction shown below. Step 1: A + B F (fast) Step 2: F+ A C+ G (slow) Step 3: G+ AC+D (fast) b) the presence of a catalyst d) increasing the concentration of the reactant b) rate=k [A] [B] [F] [G] d) rate = k [A] [B]
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