FeCl_2 can be prepared from iron and chlorine is two ways Which is true of the e
ID: 531418 • Letter: F
Question
FeCl_2 can be prepared from iron and chlorine is two ways Which is true of the enthalpy changes of these routes? (A) The single-step route has an enthalpy change that can be larger or smaller than the two-step route, depending upon conditions. (B) The single-step route will have a smaller enthalpy change than the two-step route. (C) The single-step route will have a larger enthalpy change than the two-step route, (D) The overall enthalpy changes for the two routes are the same. Use these data to determine the enthalpy changes for this reaction Na_2 CO_2 (s) rightarrow Na_2 O_(s) +/2 O_2 (s) (A) + 99 kJ (B) -99 kJ (C) +198 kJ (D) cannot determine without Delta H_f degree for O_2 (g) Cl_2 + 2I^- rightarrow I_1 + 2CI Use reactivity trends to predict which can be used to prepare Br_2 from Br^- I. F_2 + Br^- II CI_2 + Br^- III I_2 + Br^- (A) III only (B) I and II only (C) II and III only (D) I, II, and III A buried metal tank will not corrode if its is wired to a metal rod that corrodes more easily. Which combination protects the tank from corrosion? (A) Mg rod Sn tank (B) Fe rod and Zn tank (C) Fe rod Al tank (D) Cu rod Zn tank Given these standard reduction reactions, which set of species will reduce Co^3+ under standard conditions? (A) Pb, Cu (B) Zn, Fe (C) Pb^3+, Cu^3+ (D) Zn^3+, Fe^3+ Which part in this electrochemical cell is the anode? (A) 1 (B) 2 (C) 4 (D) 5 Predict the voltage for the cell Cd I Cd^2+ (1 M) II Ni^2+ (1 M) I Ni Cd^2+ (aq) + 2e^- Cd(s) E degree = 0.402 V Ni^2+ (aq) + 2e^- rightarrow Ni_(s) E degree = -0.236 V (A) -0.638 V (B) -0.166 V (C) + 0.166 V (D) + 0.638 V What happens during this reaction? Cd_(s) + NiO_2 (s) + 2H_2 O(s) rightarrow Cd(OH)_2 (s) + Ni(OH)_2 (s) (A) Cadmium metal is oxidized. (B) Cadmium metal is reduced. (C) The O atom in H_2 O is reduced. (D) The Ni atom in NiO_3 is oxidized. The solubility of a salt in water usually increases with increasing temperature because the process is (A) exothermic so dissolution occurs faster. (B) endothermic to dissolution occurs faster. (C) exothermic so the higher temperatures favors distributions. (D) endothermic so the higher temperatures favors dissolution. Which reagent, when added to BaCl_2 (aq) and filtered, produce that is essentially HCl(aq)? (A) HC_3 H_2 O_2 (B) HNO_3 (C) H_2 SO_4 (D) Na_2 SO_4Explanation / Answer
15.According to Hess law ,the enthalpy change of a chemical reaction is the same whether the reaction takes place in single step or in several steps.
So the enthalpy change is the same for these two.
Therefore option (B) is correct.
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