Zadanie 1e
Many rechargeable batteries use an alkaline electrolyte. In the nickel-cadmium cell, cadmium, Cd, is the anode. Cd(OH)2(s) + 2 e− → Cd(s) + 2 OH−(aq) E⊖ = −0.81 V…
Gibbs energy from cell potential
Apply ΔG° = -nFE°cell to calculate the standard Gibbs energy change from a cell potential, identifying n as the moles of electrons transferred in the balanced equation and using the Faraday constant from the data booklet.
Tę umiejętność sprawdza 10 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 10 Otwórz w wyszukiwarce z filtrami
Zadanie 40
An electrochemical cell is written in cell notation with its standard cell potential. Pb(s) ∣ Pb2+(aq) ∣∣ Mg2+(aq) ∣ Mg(s) Ecell⊖ = −2.24 V What is correct about the cell reaction as written? In each option the sign of…
Zadanie 5b
For a different pair of half-cells, the standard Gibbs energy change, ΔG⊖, works out to −370.6 kJ mol−1, with a single electron transferred between the electrodes in the cell reaction. Deduce what these two half-cells are. Use…
Zadanie 3b
When the cell discharges, a spontaneous redox reaction generates a potential difference between the electrodes and the temperature of the cell rises. (i) Deduce the signs of ΔHdischarge, Ecell and ΔGdischarge.…
Zadanie 7b
A standard hydrogen electrode is connected to a half-cell consisting of a zinc rod in a solution of zinc nitrate, Zn(NO3)2(aq), to form a voltaic cell. (i) Write the cell diagram for the spontaneous reaction, using "|" for a phase boundary and "||" for…
Zadanie 34
Which combination is correct for a reaction with an equilibrium constant K much smaller than 1 at 298 K under standard conditions? A. Ecell⊖ is negative and ΔG⊖ is positive B. Ecell⊖ is positive and…
Zadanie 30
For a reaction in a voltaic cell, both ΔH⊖ and ΔS⊖ are negative. Which statement is correct? ΔG⊖ = ΔH⊖ − TΔS⊖ and ΔG⊖ = −nFEcell⊖ A.…
Zadanie 4c
(i) Calculate the standard cell potential for the voltaic cell. Use section 19 of the data booklet. (ii) Calculate the standard Gibbs energy change, ΔG⊖, in kJ mol−1, for the cell reaction. Use sections 1 and 2 of the data…
Zadanie 2b
A block of zinc attached to a steel structure acts as a sacrificial anode. (i) Calculate the standard cell potential, in V, of a cell made from zinc and steel half-cells. Use section 19 of the data booklet and take the standard electrode potential of steel to…
Zadanie 3f
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…
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