22. Solid KF has a lattice energy of -804 kJ/mol and a heat of solution (in water) of -15 kJ/mol. RbF has a lattice energy of -768 kJ/mol and a heat of solution (in water) of -24 kJ/mol. Which salt forms stronger attractions with water? (A) KF, because it has a more exothermic lattice energy (B) RbF, because it has a less exothermic lattice energy (C) KF, because it has a more negative heat of hydration (D) RbF, because it has a more negative heat of hydration (E) They form equally strong attractions with water, because they both have negative heats of mixing.

22. Solid KF has a lattice energy of -804 kJ/mol and a heat of solution (in water) of -15 kJ/mol. RbF has a lattice energy of -768 kJ/mol and a heat of solution (in water) of -24 kJ/mol. Which salt forms stronger attractions with water?
(A) KF, because it has a more exothermic lattice energy
(B) RbF, because it has a less exothermic lattice energy
(C) KF, because it has a more negative heat of hydration
(D) RbF, because it has a more negative heat of hydration
(E) They form equally strong attractions with water, because they both have negative heats of mixing.

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統計： A(3), B(1), C(2), D(0), E(0) #3340067

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B1 · 2025/10/06

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1. 題目解析這道題目要求比較兩種鹽（...

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6. A strip of copper is placed in a 1 M solution of copper nitrate, and a strip of silver is placed in a 1 M solution of silver nitrate. The two metal strips are connected to a voltmeter by wires, and a salt bridge connects the solutions. The following standard reduction potentials apply: Ag⁺(aq) + e⁻ → Ag(s) E° = +0.80 V Cu²⁺(aq) + 2e⁻ → Cu(s) E° = +0.34 V When the voltmeter is removed and the two electrodes are connected by a wire, which of the following does not take place? (A) Electrons flow in the external circuit from the copper electrode to the silver electrode. (B) The silver electrode increases in mass as the cell operates. (C) There is a net general movement of silver ions through the salt bridge to the copper half-cell. (D) Negative ions pass through the salt bridge from the silver half-cell to the copper half-cell. (E) Some positive copper ions pass through the salt bridge from the copper half-cell to the silver half-cell.

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