According to the principles of chemical equilibrium and cell potential, how would decreasing the concentration of the reactant ions in the cathode half-cell affect the measured voltage?

The voltage would decrease

The voltage would drop to zero immediately

The voltage would increase

The voltage would remain exactly at $E^\circ_{\text{cell}}$

Question

True or False: Lithium-ion batteries are widely used in portable electronics primarily because they offer high energy density, allowing for a large amount of stored energy relative to their mass.

What is the expected observation regarding the concentration of $\text{Cu}^{2+}(\text{aq})$ ions in the cathode half-cell during the operation of a magnesium-copper cell?

Calculate the standard cell potential ( $E^{\circ}_{\text{cell}}$ ) for a voltaic cell constructed from lithium and copper half-cells using the following standard reduction potentials:

E^{\circ} ({Li}^{+} / Li) = -

Which of the following is a major environmental concern specifically associated with the disposal of older secondary cells like Nickel-Cadmium (NiCd) batteries?

MYP MYP Chemistry Topic Electrochemical Cell Questionbank

Practice MYP MYP Chemistry Topic Electrochemical Cell with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for Electrochemical Cell and mirrors Paper 1, 2 style where relevant.

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3.04

V

E^{\circ}(\text{Li}^{+}/\text{Li}) = -3.04\text{ V}

E^{\circ} (Li^{+} / Li) = - 3.04 V

E^{\circ}(\text{Cu}^{2+}/\text{Cu}) = +0.34\text{ V}

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True

False

The concentration decreases as copper ions are reduced to solid copper

The concentration remains constant as the salt bridge prevents ion loss

The concentration increases as copper is oxidised at the cathode

The concentration increases due to the migration of cations from the salt bridge

The risk of oxygen gas being released during decomposition

The high concentration of sodium ions in the electrolyte

The high energy cost of mining iron for the casing

The release of toxic heavy metals such as cadmium into the environment

+2.70 V

+3.38 V

-2.70 V

-3.38 V