Research scientists are developing a rechargeable magnesium-sodium, Mg-Na, hybrid cell for use in portable devices - VCE - SSCE Chemistry - Question 2 - 2021 - Paper 1
Question 2
Research scientists are developing a rechargeable magnesium-sodium, Mg-Na, hybrid cell for use in portable devices.
The Mg-Na hybrid cell uses magnesium metal and so... show full transcript
Worked Solution & Example Answer:Research scientists are developing a rechargeable magnesium-sodium, Mg-Na, hybrid cell for use in portable devices - VCE - SSCE Chemistry - Question 2 - 2021 - Paper 1
Step 1
Identify the polarity of the Mg electrode when the cell is discharging
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Answer
When the Mg-Na hybrid cell is discharging, the Mg electrode acts as the anode. Thus, it is labeled with a negative (-) sign, indicating that it is losing electrons.
Step 2
Write the half-cell equation of the reaction that occurs at the Mg electrode when the cell is discharging
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Answer
The half-cell reaction at the Mg electrode during discharging can be expressed as:
ightarrow Mg^{2+}(aq) + 2e^-$$
Step 3
Identify two potential safety hazards of having this cell in the body
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Answer
Leakage of Electrolyte: If the hybrid organic/salt electrolyte leaks, it may cause chemical burns or other reactions with biological tissues.
Thermal Runaway: The reactions within the cell can produce heat; if not properly managed, this could lead to overheating and damage to surrounding tissues.
