electropla

Using the equation 2Mn(OH)2(s)+O2(aq)->2MnO(OH)2(s), Determine the number of moles of MnO(OH)2 Formed for every one mole of O2 consumed. Show work.

1. Copper is found as the mineral covellite (CuS). The first step in extracting the copper is to dissolve the mineral in nitric acid (HNO3), which oxidizes sulfide to sufate and reduces nitric acid to NO: CuS) + HNO3(aq) → NO(g) + CuSO4 -> Balance this equation using the half- reaction method CHEM GINEE RST YEAR FRANE 6 hra

(24) The gold-plating of a ceramic figurine requires a total of 2.78 g of solid gold. If the current being used is 12.7 amperes, how many minutes will it take to plate the gold figurine? You may assume that there is sufficient concentration of gold cation to complete the process. (A) 1.79 (B) 1056 (C) 5.36 VELG 14 (D) 68.1 (E) 4.57 8

Which among the following metals has the most tendency to form oxide layers on surface implants? TABLE II.4.4.5 Electrochemical Series Metal Potential (V) Gold 1.43 1.20 Platinum Mercury 0.80 Silver 0.79 0.34 Copper Hydrogen Lead Tin Molybdenum Nickel Cobalt Cadmium Iron Chromium Zinc Aluminum Titanium Magnesium Sodium Lithium titanium iron tin aluminum 0 -0.13 -0.14 -0.20 -0.25 -0.28 -0.40 -0.44 -0.73 -0.76 -1.33 -1.63 -2.03 -2.71 -3.05

A chemist designs a galvanic cell that uses these two half-reactions: half-reaction standard reduction potential HNO,(aq)+H"(aq)+e → NO(g)+H,O(1) =+1.00 V ʼred Cl2(9)+2e 2 CI (аq) E=+1.359 V (red Answer the following questions about this cell. Write a balanced equation for the half-reaction that happens at the cathode. x10 Write a balanced equation for the half-reaction that happens at the anode. Write a balanced equation for the overall reaction that powers the cell. Be sure the reaction is spontaneous as written.

Problem 20.25 Part A Complete and balance the half-reaction in basic solution. O₂(g) → OH (aq) Express your answer as a chemical equation including phases. ΑΣΦ A chemical reaction does not occur for this question. Part B Submit Previous Answers Request Answer Complete and balance the half-reaction in basic solution. Mn²+ (aq) → MnO₂ (s) Express your answer as a chemical equation including phases. ? ΑΣΦ Part C Submit Request Answer A chemical reaction does not occur for this question. ? [ΑΣΦ Complete and balance the half-reaction in basic solution. 2 Cr(OH)2 (s) → CrO² (aq) Express your answer as a chemical equation including phases. wwwww. ?

Be sure to answer all parts. Over a period of time, the concentration of sulfuric acid in the lead storage battery of an automobile has decreased from 38.0 percent by mass (density = 1.29 g/mL) to 26.0 percent by mass (1.19 g/mL). Assume the volume of the acid remains constant at 709 mL. (a) Calculate the total charge in coulombs supplied by the battery. x 10 с Enter your answer in scientific notation. (b) How long (in hours) will it take to recharge the battery back to the original sulfuric acid using a current of 23.4 A? h

A chemist designs a galvanic cell that uses these two half-reactions: MnO4(aq)+8H(aq) +5e Cl₂(g) +2e Write a balanced equation for the half-reaction that happens at the cathode. Write a balanced equation for the half-reaction that happens at the anode. Answer the following questions about this cell. Write a balanced equation for the overall reaction that powers the cell. Be sure the reaction is spontaneous as written. + Do you have enough information to calculate the cell voltage under standard conditions? half-reaction 0 0 Yes Mn²+ (aq) + 4H₂O(1) →Mn²+, 2 C1 (aq) No standard reduction potential Eº 'red = +1.51 V E=+1.359 V red ロ→ロ X 0x19 S

NNO(g) Incorrect : N