What is the pH of a solution in which [HA] = [A^-]? pH = 1 pH = K_ pH = pK_ pH =

Question

What is the pH of a solution in which [HA] = [A^-]? pH = 1 pH = K_ pH = pK_ pH = pOH pH = 7.0 Oxidation refers to ___ an increase in oxidation number. a decrease in oxidation number. a gain in the number of protons. an increase in the atomic number. an increase in mass. When hydrogen reacts with a metal to form a hydride (e.g., CaH_2), what are the oxidation numbers of the calcium (in this case) and hydrogen, respectively, in the product? -2 and +1 +1 and -2 +2 and -1 0 and 0 +2 and -2 The following reaction occurs in basic solution. Identify the oxidizing agent. Zn(s) + NO_3^-(aq) rightarrow Zn(OH)_4^2-(aq) + NH_y(aq) H_2O(l) NO_3^-(aq) OH^-(aq) Zn(s) NH_3(aq) The following reaction occurs in acidic solution. Identify the correct half-reaction that applies to the oxidizing agent. Cr_2O_r^2-(aq) + C_2H_ OH(aq) rightarrow C_2H_2O(aq) + Cr^3+(aq) C_2H_ OH rightarrow C_2H_2O + 2 H^+ 2 sigma Cr_2O_r^2 + 3 e^- rightarrow Cr^3+ + 7 H_2O C_3H_3OH + 2 e^- + 2 H^+ rightarrow C_2H_2O + H_2O 14 H^+ + Cr_2O_r^2 rightarrow 2 Cr^3+ + 7 H_2O + sigma 14 H^+ Cr_2Or_2- + 6^e- rightarrow 2 Cr^3+ + 7 H_2O Balance the chemical equation for the following redox reaction under acidic aqueous conditions with the smallest whole-number coefficients possible using the half-reaction method. What is the coefficient of C_2H_ OH? Cr_ O_^2(aq) + C_2H_5OH(aq) rightarrow Cr^3+(aq) + CO_2(g) 1 2 3 4 5 A voltaic cell is constructed based on the reaction of Ag(CN)_2^-(aq) with Cr(s) producing A g(s) and Cr^3+(s). Identify the correct cell diagram. Ag (CN)_2^-(aq) | Cr(s) || Ag(s) | Cr^3+(aq) Ag(s) | Cr^3+(aq) || Ag(CN)_2^-(aq) | Cr(s) Cr(s) | Cr^3+(aq) || Ag(s) | Ag(CN)_2^-(aq) Ag(CN)_2^-(aq) | Ag(s) || Cr(s) | Cr^3+(aq) Cr(s) | Cr^3+(aq) || Ag(CN)_2^+(aq) | Ag(s)

Explanation / Answer

As mentioned by you that explainations are not required only correct answers are as follows.

47. Answer (e )

48. Answer ( a ) an increase in oxidation number .

49. Answer ( C ) +2 and -1

50. Answer ( b ) NO3-

51. Answer ( a )

52. Answer ( a ) 1

53. Answer ( e )

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