Assuming the reaction proceeds in the forward direction: 2Ni^2+ (aq) + Zn(s) rig

Question

Assuming the reaction proceeds in the forward direction: 2Ni^2+ (aq) + Zn(s) rightarrow 2Ni (s) + Zn^2+ (aq) Zn(s) is the _____ agent because it ____ electrons. (A) oxidizing; gains (B) reducing; gain (C) oxidizing; loses (D) reducing; loses This equation describing a cell reaction Ag^+ (aq) + Cu(s) rightarrow Cu^2+ (aq) + Ag(s) (A) is not balanced because there should be a free electron on the right side. (B) is balanced because there is one copper and one silver on each side. (C) is not balanced because charge needs to be balanced. (D) cannot be balanced. How many moles of electrons are transferred when this oxidation/reduction equation is balanced to the smallest whole number coefficients? Al(s) + HCl(aq) rightarrow AlCl_3 (aq) + H_2 (g) (unbalanced) (A) 2 (B) 3 (C) 4 (D) 6 Given the standard reduction potentials at 25 degree C, which cell reaction is spontaneous? (A) 2Ag(s) + Ni^2+ (aq) rightarrow 2Ag^+ (aq) + Ni(s) (B) Ni(s) + 2Ag^+ (aq) rightarrow Ni^2+ (aq) + 2Ag(s) C) Au(s) + 3Ag^+ (aq) rightarrow Au^3+ (aq) + 3Ag(s) (D) 2Au(s) + 3Ni^2+ (aq) rightarrow 2Au^3+ (aq) + 3Ni(s) The standard cell potential for the reaction Zn(s) + Cu^2+ (aq) rightarrow Zn^2+ (aq) + Cu(s) is +1.10 V. If the molar concentrations of both Cu^2+ and Zn^2+ are changed to 2.0 M, the cell potential will be (A) equal to -1.10 V. A current of 35.2 is passed through a Cr^+3 solution for 6.00 minutes. What mass of chromium metal is deposited on the cathode? (A) 0.0379 g (B) 2.28 g (C) 6.83 g (D) 20.5 g In a galvanic cell, electrons flow from the (A) anode to the cathode. (B) cathode to the anode. (C) salt bridge to the anode. (D) salt bridge to the cathode. Which ion has the smallest radius? (A) F^- (B) Mg^2+ (C) Na^(D) O^2- What is the strongest acid? (A) HBr (B) HF (C) H_2O (D) H_2Se Which element LEAST readily reacts with water at room temperature to form a metal hydroxide and hydrogen gas? (A) Sr (B) Sc (C) K (D) Cs Which factor has the greatest effect on atomic radius as one moves from left to right across a row on the periodic table? (A) increasing nuclear charge (B) increasing number of neutrons (C) increasing principal quantum number (D) increasing electron-electron repulsion The first four ionization energies for an element are tabulated. What is the element? (A) B (B) Be (C) C (D) N

Explanation / Answer

(58) Zn (s) ----------> Zn2+ (aq.) + 2 e

(d) Reducing agent because it loses electrons.

(59) (C) Charge needs to be balanced.

2 Ag+ (aq.) + Cu (s) --------> Cu2+ (aq.) + 2 Ag (s)

(60) 2 Al (s) + 6 HCl (aq.) ------------> 2 AlCl3 (aq.) + 3 H2 (g)

Each Al loses 3 electrons in overall 6 electrons are being transferred during the reaction.

(D)

(61)

(B) is sontaneous. Because electrode potential of Ni2+ is smaller than Ag+. Hence Ni undergoes oxidation and Ag+ undergoes reduction.

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