Electrochemistry

In the electrolysis of any molten metal halide, where will the metal always be formed?

Which of the following chemical species is an example of a cation?

What happens to bromide ions ($Br^{-}$) when they reach the anode in molten electrolysis?

What is the typical state of the metal produced at the cathode during electrolysis if the temperature of the molten salt is above the metal's melting point?

During the electrolysis of molten aluminium oxide using carbon anodes, the anodes gradually disappear. What is the reason for this?

In the electrolysis of molten lead(II) bromide, why does the bulb in the circuit only light up once the salt has melted?

Which of the following describes the change in the ions during the electrolysis of molten potassium fluoride?

A certain molten halide $MX_{n}$ produces 2.8 g of metal $M$ and 0.1 mol of $X_{2}$ gas when electrolyzed. If the Ar of $M$ is 56, what is the value of $n$?

In the electrolysis of molten $TiCl_{4}$ (assuming it were ionic and molten for the sake of the problem, though it is covalent), how many Faradays are needed to produce 12 g of Titanium? (Ar: $Ti = 48$)

Which of the following graphs would correctly represent the mass of metal deposited ($m$) vs the time ($t$) for a constant current electrolysis of a molten salt?

In the electrolysis of water (with a little acid), why is more gas collected at one electrode than the other?

Which electrode is the negative terminal in the following circuit?

What is the name of the process that occurs when an ion gains electrons at an electrode?

In the electrolysis of aqueous zinc chloride, if the solution is concentrated, what is produced at the anode?

In the electrolysis of water acidified with $H_2SO_4$, if 10 $cm^3$ of oxygen is produced at the anode, what volume of hydrogen is produced at the cathode?

Identify the species that is reduced during the electrolysis of aqueous magnesium bromide.

Which of the following electrodes is considered 'active' during the electrolysis of aqueous $CuSO_4$?

During the electrolysis of aqueous $K_2SO_4$ with inert electrodes, what is the net reaction?

Aqueous sodium chloride is electrolyzed. Which ion is the spectator ion that remains in the solution to form a useful byproduct?

Which of the following is the balanced cathode half-equation for the electrolysis of aqueous $AgNO_3$?

Which particle flows through the wires connecting the battery to the electrodes?

Why does electroplating help to increase the lifespan of a metal bridge component?

In an electroplating cell, the anode is the...

If $10 \text{ g}$ of copper is lost from the anode during electroplating, how much copper is theoretically deposited on the cathode?

What happens to the metal atoms on the surface of the anode during the electroplating process?

Which of the following is true regarding the mass of the electrolyte during the electroplating of copper using a copper anode?

Why is it important to use a relatively low current for a long duration rather than a high current for a short duration in electroplating?

What is the primary reason that a 'cyanide' electrolyte allows for much higher 'throwing power' than a 'sulfate' electrolyte in copper plating?

In a silver electroplating cell, the mass of the silver anode decreases by 5.4 g. If the current efficiency is 100%, how many electrons were transferred at the cathode during this time? ($A_r$ of $Ag = 108$)

A metal $X$ is electroplated from a solution of $X_2(SO_4)_3$. If 1.0 Faraday of electricity is passed through the solution, how many moles of $X$ are deposited?

What is the function of the porous nature of the carbon electrodes in a fuel cell?

Why is the hydrogen-oxygen fuel cell considered 'green'?

Which substance is commonly used as an electrolyte in a PEM fuel cell?

What happens to the electrons produced at the anode of a fuel cell?

A fuel cell is a type of electrochemical cell. How does it differ from a primary cell (like a dry cell)?

If a fuel cell operates using an alkaline electrolyte, what happens to the concentration of $OH^-$ over time if water is not removed?

Compare the oxidation of hydrogen in a fuel cell versus its combustion in air. Which statement is true?

A fuel cell is used to power a remote weather station. The cell operates using the reaction: $2H_2(g) + O_2(g) \rightarrow 2H_2O(l)$. If the Gibbs Free Energy change ($\Delta G^{\theta}$) for the reaction is $-237\ kJ\ mol^{-1}$ of water produced, calculate the theoretical maximum EMF ($E^{\theta}_{cell}$) of the cell.

Environmental scientists argue that hydrogen fuel cells are only 'zero-emission' at the point of use. If the hydrogen is produced via steam reforming of methane ($CH_4 + H_2O \rightarrow CO + 3H_2$), what is the total mass of $CO_2$ eventually released per kg of $H_2$ consumed, assuming CO is further shifted to $CO_2$ ($CO + H_2O \rightarrow CO_2 + H_2$)?

In a high-temperature Solid Oxide Fuel Cell (SOFC), the electrolyte is a solid ceramic (e.g., Yttria-stabilized zirconia) that conducts oxide ions ($O^{2-}$). Which reaction occurs at the anode when hydrogen gas is supplied?