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Consider the following cell notation:
Mg(s) | Mg2+(aq) || Cu2+(aq) | Cu(s)
Determine the Mg2+:Cu2+ concentration ratio at 25.0 °C if the cell potential is measured to be 2.74 V. (E°red,Mg2+ = −2.37 V; E°red,Cu2+ = 0.34 V)
Identify the metals that can be used for the cathodic protection of iron: Ni, Mg, Co, Zn, Cd
Molten carbonate fuel cells (MCFC) are newly developed fuel cells that commonly use molten lithium and potassium carbonates as electrolytes. The half-reactions in the cell are shown below:
Anode: H2(g) + CO32–(l) → H2O(l) + CO2(g) + 2 e–
Cathode: 1/2 O2(g) + CO2(g) + 2 e– → CO32–(l)
(a) What is the mass of hydrogen gas (in grams) needed to generate a constant current of 12.4 A for 10.0 h?
(b) What is the volume (in liters) of the hydrogen gas if the required conditions are 650°C and 1406 mmHg?
If 300.0 g of Sn(NO3)2(s) has to be transformed into Sn(s) and SnO2(s) in order to charge an experimental Sn(NO3)2(s) battery, how much coulombs of electrical are needed?
Everyday household items such as flashlights and radios use alkaline batteries. The overall reaction in the battery is as follows:
Zn(s) + 2 MnO2(s) ⇌ ZnO(s) + Mn2O3(s)
At one of the battery's electrodes, Zinc metal is a reactant. Which of the following is true?
The negative electrode in a galvanic cell is the cathode. Is this statement true or false? Justify your answer.
For the given reaction, determine the cathode and anode half-reactions. Draw the electrochemical cell, label it correctly, and show the direction of the flow of electrons and ions.
Cr(s) + Pb2+(aq) → Cr2+(aq) + Pb(s)
Given Br–(aq), Ca(s), Hg22+(aq), H2(g), identify the weakest and strongest reducing agent.
Given the following: Cl2(g), Na+(aq), S(s), H2O(l), identify the weakest and strongest oxidizing agent.
Refer to the following substances: Zn(s), HNO2(aq), HClO(aq), H2C2O4(aq), Bi(s), and IO3–(aq).
(a) Hg2Cl2(s) is capable of oxidizing which substances?
(b) H3AsO3(aq) is capable of reducing which substances?
Which of the following incorrectly defines the volt?