Experiment: A beaker containing water and ice was kept at room temperature and its temperature was recorded every minute.Observation: The temperature remained at 0°C until all ice melted.Question: What does this show?
Correct answer: D. Latent heat of fusion keeps temperature constant during phase change.
- A. Ice absorbs no heat from the surroundings.
- B. Melting lowers temperature further.
- C. Water is a poor conductor of heat.
- D. Latent heat of fusion keeps temperature constant during phase change.
Explanation
The correct answer is Option D: Latent heat of fusion keeps temperature constant during phase change. This explanation is supported by the observation that the temperature remained constant at 0°C until all ice melted. The latent heat of fusion is the energy required to change a substance from solid to liquid, and during this phase change, the absorbed heat is used to break the intermolecular bonds rather than increase the temperature. The other options are incorrect because they do not accurately explain the phenomenon observed in the experiment.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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