When the current is flowing
A - VCE - SSCE Chemistry - Question 5 - 2006 - Paper 1
Question 5
When the current is flowing
A. the anode is positive and the cathode is negative.
B. an oxidation reaction occurs at the positive electrode.
C. anions in the salt br... show full transcript
Worked Solution & Example Answer:When the current is flowing
A - VCE - SSCE Chemistry - Question 5 - 2006 - Paper 1
Step 1
A. the anode is positive and the cathode is negative.
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Answer
This statement is correct. In an electrochemical cell, the anode is indeed positive during current flow, while the cathode is negative. This designation is important as it helps understand the flow of current and the reactions occurring at each electrode.
Step 2
B. an oxidation reaction occurs at the positive electrode.
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Answer
This statement is incorrect. Oxidation reactions occur at the anode, which is the negative electrode in a galvanic cell. Therefore, the positive electrode does not facilitate oxidation, but rather reduction occurs there.
Step 3
C. anions in the salt bridge move towards the negative electrode.
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Answer
This statement is accurate. In an electrochemical cell, anions in the salt bridge migrate towards the positive electrode to balance charge as positive ions move towards the negative electrode.
Step 4
D. electrons travel in the external circuit from the cathode to the anode.
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Answer
This statement is correct. In the external circuit, electrons flow from the cathode (negative) to the anode (positive). This flow is what constitutes the electric current.
