Question detail
Which diagram or label choice best matches chemistry only in this Energy changes subtopic?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Chemical cells and fuel cells (chemistry only)
Question
- A. chemistry only: correct Unit 4.5 answer for Fuel cells in a sports cold-pack example
- B. Incorrect label: confuses the labelled quantity with activation energy
- C. Incorrect label: places a sports cold-pack example on the wrong part of the model
- D. Incorrect label: uses the product/reactant relationship the wrong way round
Answer
The correct option is chemistry only: correct Unit 4.5 answer for Fuel cells in a sports cold-pack example.
Explanation
The correct option is chemistry only: correct Unit 4.5 answer for Fuel cells in a sports cold-pack example. It directly supports the approved learning objective to (chemistry only) Describe fuel cells as being supplied by an external source of fuel and oxygen or air. This calculation version keeps the answer anchored to Fuel cells within Chemical cells and fuel cells (chemistry only), and avoids mixing energy transfer, reaction profiles, activation energy, chemical cells, fuel cells, exothermic reactions and endothermic reactions unless the objective names them.
Common mistake
Misunderstanding Fuel Sources
Students often think that fuel cells generate their own fuel instead of being supplied by an external source.
Emphasize that fuel cells require an external supply of fuel and oxygen or air to operate.
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