Question detail

What is the main limitation of predictions based on standard conditions for electrochemical cells?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Electrode potentials and electrochemical cells (A-level only)

Question

A. They ignore concentration effects.
B. They do not account for temperature variations.
C. They assume all reactions are spontaneous.
D. They are only applicable to non-rechargeable cells.

Answer

They ignore concentration effects.

Explanation

The correct option is They ignore concentration effects.. They ignore concentration effects. is the best answer because it directly supports the AQA A-Level Chemistry objective to compare fuel cells with rechargeable and non-rechargeable cells. This reasoning is anchored to Feasibility and applications of cells (A-level only) in Electrode potentials and electrochemical cells (A-level only), and it separates fuel cell from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.

Common mistake

Fuel Cells vs. Rechargeable Cells

Students often confuse the operation of fuel cells with rechargeable cells, thinking they function the same way.

Fuel cells convert chemical energy from a fuel (like hydrogen) directly into electrical energy through a chemical reaction, while rechargeable cells store electrical energy chemically and can be recharged by applying an external current. Fuel cells are used continuously as long as fuel is supplied, whereas rechargeable cells can be used multiple times but need to be recharged after use. Keep the correction anchored to Feasibility and applications of cells (A-level only) and the objective: Compare fuel cells with rechargeable and non-rechargeable cells.

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