30 Questions
In a galvanic cell, how is the potential difference between two electrodes measured?
By connecting them to a voltmeter
In the standard hydrogen electrode setup, what is the potential assigned to the SHE?
0 volts
What components are needed to make an electrode a standard reference electrode?
Hydrogen gas at pressure of 100 kPa and solution containing hydrogen ions at 1.00 mol dm-3
Why are standard conditions necessary for a reference electrode like the standard hydrogen electrode?
To maintain consistency in potential measurements
In a cell diagram, how is the hydrogen electrode represented?
| Pt | H2 (g) | H+ (aq)
How does changing the concentration of Mn+ ions affect the redox equilibrium in a cell?
It shifts the equilibrium to the right
What happens to Ecell as the reactant concentrations drop in a cell reaction?
Ecell decreases
What is the relationship between Ecell and the likelihood of a reaction occurring?
Higher Ecell indicates a more likely reaction
How does increasing the concentration of Fe2+ and decreasing Zn2+ affect Ecell?
Ecell increases
What effect does a temperature rise have on Ecell for exothermic cells?
Ecell decreases
What does a positive Ecell value indicate about a reaction?
The reaction might occur
How does carrying out a reaction at non-standard conditions affect Ecell compared to standard conditions?
Ecell decreases
What is the standard electrode potential for the half cell: Cu2+(aq) | Cu(s)?
+0.34V
How can the percentage apparatus uncertainty in a titration be reduced?
Increasing the volume and concentration in the conical flask
In the reaction Mg + Cu2+ → Cu + Mg2+, which species is undergoing reduction?
Cu
What effect does using a balance that measures to more decimal places have on the percentage uncertainty in weighing a solid?
Decreases the uncertainty
What is the standard electrode potential for the half cell: Mg2+(aq) | Mg(s)?
-2.37V
How does reducing the uncertainty in a burette reading affect the volume of the titre?
Increases the volume of the titre
Which electrode will oxidize and go from right to left in a redox reaction?
Mg(s)
What is the impact of using burettes with lower apparatus uncertainty in a titration?
Decreases the experimental uncertainty
To determine the Ecell for a spontaneous change, what formula is used?
Ecell = Ered - Eox
When looking at a series of measurements, which experiments will have the highest experimental uncertainties?
Experiments with small readings
What will happen in a spontaneous change with regards to the Ecell value?
Ecell will be positive
How does taking two readings during a titration affect the uncertainty on the titre volume?
+/- 0.10 cm3
What type of electrochemical cell is a non-rechargeable cell?
Irreversible
In the primary non-rechargeable cells provided, what is the overall reaction for the Dry Cell example?
2MnO2(s) + 2NH4+(aq) + Zn → Mn2O3 + 2NH3 + H2O + Zn2+
What is the standard electrode potential for the primary Lithium–manganese dioxide non-rechargeable cell?
-3.04 V
Which component is not present in the conventional cell diagram of the primary Lithium–manganese dioxide non-rechargeable cell?
| Pt (s)
What is the oxidation half-reaction for the forward reaction in the Lead acid secondary rechargeable cell?
PbSO4 + 2e- → Pb + SO42-
What is the cell potential for the Lead acid secondary rechargeable cell?
+2.91V
This quiz explores how changes in reactant concentrations affect the cell potential (Ecell) in cell reactions. By understanding Le Chatelier's principle, you can determine how increasing or decreasing reactant concentrations impact Ecell and the equilibrium of the reaction.
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