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The following diagram shows two connected electrochemical cells - VCE - SSCE Chemistry - Question 29 - 2021 - Paper 1
Question 29
The following diagram shows two connected electrochemical cells. The following diagram shows two connected electrochemical cells. Which of the following gives the ... show full transcript
Worked Solution & Example Answer:The following diagram shows two connected electrochemical cells - VCE - SSCE Chemistry - Question 29 - 2021 - Paper 1
Step 1
Cell 1: Identify Energy Transformation
Answer
In Cell 1, zinc (Zn) undergoes oxidation, leading to the conversion of chemical energy into electrical energy as electrons flow to the copper (Cu) electrode. This transformation can be represented as:
ightarrow ext{ Zn}^{2+} ext{(aq)} + 2e^-$$ Here, the chemical energy from the zinc is being converted to electrical energy as it loses electrons.Step 2
Cell 2: Identify Energy Transformation
Answer
In Cell 2, copper (Cu) ions gain electrons from the external circuit, which signifies a reduction process. This process converts electrical energy into chemical energy as the reaction proceeds:
ightarrow ext{Cu (s)}$$ In this instance, the electrical energy is stored as chemical energy in the form of solid copper.Step 3