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WalesChemistryQuick questions
Unit 3: Physical and Inorganic Chemistry
Quick questions on Redox and standard electrode potential - WJEC A-Level Chemistry
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are batteries and fuel cells?Show answer
The EMF of a cell is the difference of electrode potentials, the basis of designing batteries and the hydrogen fuel cell, whose driving force comes from a large potential difference. Corrosion protection. Sacrificial anodes work because a metal with a more negative electrode potential (like zinc or magnesium) oxidises preferentially, protecting iron from rusting.
What is q1?Show answer
State the value assigned to the standard hydrogen electrode. [1 mark]
What is q2?Show answer
Calculate the EMF of a cell from electrodes at V and V. [1 mark]
What is q3?Show answer
State what a positive cell EMF indicates about a reaction. [1 mark]
What is q4?Show answer
State why a high-resistance voltmeter is used to measure electrode potential. [1 mark]
What is q5?Show answer
State one limitation of using standard electrode potentials to predict reactions. [1 mark]
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