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In a calorimetric measurement, what is meant by the system?
AThe matter undergoing the change being studied
BAll the matter other than the change being studied
CThe thermometer and the stirrer taken together
DThe insulating cover placed over the apparatus
Answer & Solution
Correct answer: A. The matter undergoing the change being studied
1. The system is the substance or substances undergoing the change under study.
2. The surroundings are everything else, including the solution and the apparatus.
3. Heat lost by the system is gained by the surroundings, and the reverse also holds.
4. Knowing the heat capacity of the surroundings lets the heat transferred be calculated.
5. Thermometers and covers are parts of the apparatus, so they belong to the surroundings.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 5 "Thermochemistry", section 5.2 Calorimetry_
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