7. The elements of Group 5A, the nitrogen family, form compounds with hydrogen that have the boiling points listed below. SbH3 -17°C, AsH3 -55°C, PH3 -87°C, NH3 -33°C The first three elements illustrate a trend where the boiling point increases as the mass increases； however, ammonia (NH3) does not follow the trend because of (A) ionic bonding. (B) hydrogen bonding. (C) metallic bonding. (D) dipole-dipole attraction. (E) London dispersion forces.

7. The elements of Group 5A, the nitrogen family, form compounds with hydrogen that have the boiling points listed below.

SbH₃ -17°C, AsH₃ -55°C, PH₃ -87°C, NH₃ -33°C

The first three elements illustrate a trend where the boiling point increases as the mass increases； however, ammonia (NH3) does not follow the trend because of
(A) ionic bonding.
(B) hydrogen bonding.
(C) metallic bonding.
(D) dipole-dipole attraction.
(E) London dispersion forces.

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統計： A(0), B(3), C(0), D(0), E(0) #3252549

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4. 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) Negative ions pass through the salt bridge from the silver half-cell to the copper half-cell. (B) Some positive copper ions pass through the salt bridge from the copper half-cell to the silver half-cell. (C) The silver electrode increases in mass as the cell operates. (D) Electrons flow in the external circuit from the copper electrode to the silver electrode. (E) There is a net general movement of silver ions through the salt bridge to the copper half-cell.

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