REGULAR QUIZZES - REGULAR TOPIC 12 Thermochemistry SET C
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QUESTION 1. In terms of energy, breaking a covalent bond always involes which of the following?

(A) The release of energy (Exothermic)
(B) No energy change
(C) The input of energy (Endothermic)
(D) It could be either Exothermic or Endothermic
(E) None of the Above

QUESTION 2. The standard enthalpy change for the formation of sulfur dioxide is = Q kJ mol-1. The standard enthalpy change for the formation of sulfur trioxide is = R kJ mol-1. What would be the enthalpy change for the reaction of two moles of sulfur dioxide with oxygen to produce two moles of sulfur trioxide?

(A) Q - R
(B) R - Q
(C) 2Q - R
(D) 2Q - 2R
(E) 2R - 2Q

QUESTION 3. The Bond Energy terms for H-H, Cl-Cl and H-Cl are 440, 240 and 430 kJ mol-1 respectively. Calculate the Delta H for the reaction between hydrogen and chlorine gas to produce two moles of hydrogen chloride gas.

(A) -860
(B) -620
(C) -440
(D) -180
(E) +240

QUESTION 4. What name is given to the following process. Na(s)==> Na(g)?

(A) Enthalpy of ionization
(B) Enthalpy of First Ionization
(C) Lattice Enthalpy
(D) Enthalpy of Electron Affinity
(E) None of the Above

QUESTION 5. If the process Cl2(g) ==> 2Cl(g) has an enthalpy = T kJ, then, which of the following terms would appear in the Born-Haber cycle for NaCl?

(A) T
(B) 2T
(C) 1.5T
(D) 0.5T
(E) 3T




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