Practice Exam 3 Q11-20 Spring 2023 (2)

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Chm152 11. For a given reaction, E° is large and negative. Which of the following statements is true? [a] The reaction will have a positive G°. [b] Reactants are favored [c] Products are favored [d] The equilibrium constant, K , is large. [e] All of these are true.
Chm152 11. For a given reaction, E° is large and negative. Which of the following statements is true? [a] The reaction will have a positive G°. [b] Reactants are favored [c] Products are favored [d] The equilibrium constant, K , is large. [e] All of these are true.
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Chm152 12. Determine the standard free energy change, G °, for a reaction in which ∆ H ° = +1110.0 kJ and ∆ S ° = 60.00 J/K. Assume a temperature of 100.0°C. [a] 1.334 10 5 kJ [b] 1.050 10 4 kJ [c] 615.9 kJ [d] 108.8 kJ [e] 884.1 kJ
Chm152 12. Determine the standard free energy change, G °, for a reaction in which ∆ H ° = +1110.0 kJ and ∆ S ° = 60.00 J/K. Assume a temperature of 100.0°C. [a] 1.334 10 5 kJ [b] 1.050 10 4 kJ [c] 615.9 kJ [d] 108.8 kJ [e] 884.1 kJ
Chm152 A catalyst may be defined as: [a] a substance that lowers the activation energy of a reaction. [b] a substance that increases the enthalpy of a reaction. [c] a substance that increases the temperature of a reaction. [d] a substance that increases the order of the reaction. [e] a substance that shifts the equilibrium position to the right (toward products).
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Chm152 A catalyst may be defined as: [a] a substance that lowers the activation energy of a reaction. [b] a substance that increases the enthalpy of a reaction. [c] a substance that increases the temperature of a reaction. [d] a substance that increases the order of the reaction. [e] a substance that shifts the equilibrium position to the right (toward products).
Chm152 14. The rate constant for a particular reaction is 3.3 10 -4 M 1 s 1 at 300 C, and 4.4 10 -3 M 1 s 1 at 500 C. What is the activation energy (in kJ/mol) for this reaction? [a] 16 kJ/mol [b] 56 kJ/mol [c] 99 kJ/mol [d] 48 kJ/mol [e] 22 kJ/mol
Chm152 14. The rate constant for a particular reaction is 3.3 10 -4 M 1 s 1 at 300 C, and 4.4 10 -3 M 1 s 1 at 500 C. What is the activation energy (in kJ/mol) for this reaction? [a] 16 kJ/mol [b] 56 kJ/mol [c] 99 kJ/mol [d] 48 kJ/mol [e] 22 kJ/mol
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Chm152 15. The pH of a 0.10 M HNO 3 solution is: [a] 1.00 [b] 0.00 [c] 1.00 [d] 7.00 [e] 14.00
Chm152 15. The pH of a 0.10 M HNO 3 solution is: [a] 1.00 [b] 0.00 [c] 1.00 [d] 7.00 [e] 14.00
Chm152 16. Which of the following solutions will have the lowest pH? [a] 0.10 M NaOH [b] 0.10 M Ba(OH) 2 [c] 0.10 M HF [d] 0.10 M HCl [e] 0.10 M NH 3
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Chm152 16. Which of the following solutions will have the lowest pH? [a] 0.10 M NaOH [b] 0.10 M Ba(OH) 2 [c] 0.10 M HF [d] 0.10 M HCl [e] 0.10 M NH 3
Chm152 17. Which aqueous solution is expected to be acidic? [a] NaCl [b] NaF [c] KCN [d] NH 4 Cl [e] none are acidic
Chm152 17. Which aqueous solution is expected to be acidic? [a] NaCl [b] NaF [c] KCN [d] NH 4 Cl [e] none are acidic
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Chm152 18. Calculate the pH of a 0.75 M solution of a weak acid, HA ( K a = 3.3 10 -6 . ) [a] 0.016 [b] 2.80 [c] 3.15 [d] 6.00 [e] 6.30
Chm152 18. Calculate the pH of a 0.75 M solution of a weak acid, HA ( K a = 3.3 10 -6 . ) [a] 0.016 [b] 2.80 [c] 3.15 [d] 6.00 [e] 6.30
Chm152 19. Which of the following mixtures would produce an effective buffer solution? I) 1.0 M HCl / 1.0 M NaCl II) 1.0 M HNO 2 / 1.0 M NaNO 2 III) 1.0 M CH 3 COOH / 1.0 M NaCl IV) 1.0 M CH 3 COOH / 1.0 M NaF V) 1.0 M HNO 3 / 1.0 M NaNO 3 [a] II only [b] III only [c] V only [d] I, IV, and V [e] II and III
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Chm152 19. Which of the following mixtures would produce an effective buffer solution? I) 1.0 M HCl / 1.0 M NaCl II) 1.0 M HNO 2 / 1.0 M NaNO 2 III) 1.0 M CH 3 COOH / 1.0 M NaCl IV) 1.0 M CH 3 COOH / 1.0 M NaF V) 1.0 M HNO 3 / 1.0 M NaNO 3 [a] II only [b] III only [c] V only [d] I, IV, and V [e] II and III
Chm152 20. What is the net ionic equation for the reaction between HBr and KOH? [a] H + + OH - -> H 2 O [b] HBr + KOH -> NaBr + H 2 O [c] K + + Br - -> KBr [d] H + + Br - + K + + OH -> K + + Br - + H 2 O
Chm152 20. What is the net ionic equation for the reaction between HBr and KOH? [a] H + + OH - -> H 2 O [b] HBr + KOH -> NaBr + H 2 O [c] K + + Br - -> KBr [d] H + + Br - + K + + OH -> K + + Br - + H 2 O
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Chm152
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