Describe a voltaic cell built from two metal/metal-ion half-cells, a salt bridge and an external circuit, explain the direction of electron flow from anode to cathode and the movement of ions through the salt bridge, and write the electrode reactions.
Tę umiejętność sprawdza 20 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Iron and nickel can be used to design a voltaic cell. Fe(s) + Ni2+(aq) → Fe2+(aq) + Ni(s) (i) Annotate the diagram with the appropriate electrodes, electrolyte solutions and the direction of electron flow. (ii) The redox reactions in some voltaic…
Which combination is correct for this cell, when nickel is more reactive than silver? A. Cathode: silver; anode: nickel; sign on cathode: -; sign on anode: + B. Cathode: nickel; anode: silver; sign on cathode: -; sign on anode: + C. Cathode: nickel; anode:…
Both of the reactions below occur spontaneously at room temperature. Zn(s) + Fe2+(aq) → Zn2+(aq) + Fe(s) Fe(s) + Sn2+(aq) → Fe2+(aq) + Sn(s) Which conclusion can be drawn about a voltaic cell built from the half-cells…
A voltaic cell is represented by the cell diagram below. Which species is produced at the cathode? Ni(s) ∣ Ni2+(aq) ∣∣ Ag+(aq) ∣ Ag(s) A. Ni(s) B. Ni2+(aq) C. Ag+(aq) D. Ag(s)
This half-cell needs an aqueous solution containing Ni2+ ions. State the formula of a compound that would supply this solution when dissolved in water.
Describe the setup needed to join the Ni2+ | Ni half-cell to a second half-cell so that the completed cell lights a bulb.
Magnesium is a stronger reducing agent than lead. A voltaic cell is constructed using magnesium and lead electrodes dipped into solutions of their respective ions, Mg2+(aq) and Pb2+(aq), of equal concentrations. What is correct when the…
Which statement correctly describes a type of electrochemical cell? A. A secondary cell operates as a voltaic cell when discharging and as an electrolytic cell when it is recharged B. A primary (voltaic) cell converts electrical energy into chemical energy C.…
Which statement is correct for a voltaic cell made from a zinc half-cell and a copper half-cell? The standard electrode potential of the zinc half-cell is more negative than that of the copper half-cell. A. Zinc is the cathode. B. Electrons flow through the…
Zinc lies above nickel in the reactivity series. A voltaic cell is made from a zinc electrode in Zn2+(aq) and a nickel electrode in Ni2+(aq). The electrodes are connected by a wire with a voltmeter, and the two solutions are connected by a salt…
A voltaic cell is constructed from a half-cell of metal A in a solution of A2+ ions and a half-cell of metal B in a solution of B2+ ions. The half-cells are joined by a salt bridge and an external wire. Metal B is the more reactive metal. What…
Sketch the voltaic cell that would produce the greatest cell potential (EMF) using the metals and solutions in this experiment. On your diagram label the metal and the solution in each half-cell, the anode, the cathode, the salt bridge and the direction of…
A voltaic cell was constructed from an iron(II) sulfate/iron half-cell and a copper(II) sulfate/copper half-cell, connected by a salt bridge and, externally, by a wire. (i) Outline why electrons flow from the iron half-cell to the copper half-cell when the two…
Which statement describes a voltaic cell? A. It converts electrical energy to chemical energy using a spontaneous redox reaction B. It converts chemical energy to electrical energy using a non-spontaneous redox reaction C. It converts electrical energy to…
A voltaic cell is set up with the cell diagram and a salt bridge containing aqueous potassium nitrate. Which statements are correct while the cell operates? I. The mass of the silver electrode…
A voltaic cell consists of a zinc electrode in aqueous zinc sulfate and a copper electrode in aqueous copper(II) sulfate, joined by an external circuit and by a salt bridge containing aqueous potassium nitrate. What occurs during the operation of the cell? I.…
Which statement is correct for the cathode in both a voltaic cell and an electrolytic cell? A. It is the positive electrode B. It is the negative electrode C. Anions move towards it D. Reduction takes place at it
A battery is connected in a circuit. The arrows show the direction of electron flow. What does terminal X of the battery represent? A. Anode and positive terminal B. Anode and negative terminal C. Cathode and positive terminal D. Cathode and negative terminal
The diagram shows an unlabelled voltaic cell for the reaction: Ni(s) + 2 Ag+(aq) → Ni2+(aq) + 2 Ag(s) (i) Identify, using species from the equation, what W, X, Y and Z are, and state the direction of electron flow in the external circuit. (ii) Write the…
A voltaic cell is based on the reaction Zn(s) + Ni2+(aq) → Zn2+(aq) + Ni(s) The half-cells are connected by a salt bridge containing aqueous potassium nitrate. What happens when the cell operates? A. Electrons flow from Ni to Zn; anions in the…
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