Middle School Physical Science Quiz
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MATTER AND ITS INTERACTIONS
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A hot pack prototype uses 40 g of calcium chloride in a zip bag, wrapped in one layer of felt. Criterion: stay at or above 40∘C40^\circ\text{C} for 2 hours. Test results (temperature vs. time): - 5 min: 45∘C45^\circ\text{C} - 30 min: 42∘C42^\circ\text{C} - 60 min: 39∘C39^\circ\text{C} - 120 min: 30∘C30^\circ\text{C} Which statement best explains why a design modification is needed?
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