Why must one allow the thermometer to cool after obtaining the temperature of th

Question

Why must one allow the thermometer to cool after obtaining the temperature of the boiling water and before placing the thermometer in the coffee cup calorimeter? A. The thermometer's metal probe can absorb heat from the boiling water and cause an unwanted increase in the temperature of the water in the calorimeter. B. The digital thermometer may break if the temperature of the probe changes too quickly. C. The hot metal probe may melt the Styrofoam cup. If a stove supplies the same amount of heat to both an iron pan and a copper pan of equal masses, which pan will be at a higher temperature after heating for 5 minutes?

Explanation / Answer

1.A. The thermometer's metal probe can absorb heat from the boiling water and cause an unwanted increase in the temperature of the water in the calorimeter.

2. Copper pan will be at higher temperature. Copper has specific heat of 0.385 J/g. oC and Iron has 0.444 J/g.oC. Since copper requires less heat than does iron its temperature rises more.

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