Calorimetry — Flashcards

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Heat is energy in transit due to random molecular motion. It flows from a body at higher temperature to a body at lower temperature. SI unit: joule (J).

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Temperature is the degree of hotness or coldness of a body. It measures the average internal kinetic energy of the molecules of a substance and determines the direction of heat flow.

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The SI unit of heat is joule. 1 calorie = 4.186 joule, approximately 1 cal = 4.2 J.

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Given: Q = 840 J, Δt = 20 K Formula: c' = Q/Δt Step 1: c' = 840/20 Step 2: c' = 42 J/K Answer: Heat capacity = 42 J/K…

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Heat capacity is the amount of heat required to raise the temperature of the whole mass of a body by 1°C or 1 K. It depends on mass and material both. Unit: cal/°C, J/°C, J/K, or kilocalorie/K.

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Specific heat capacity is the amount of heat required to raise the temperature of unit mass of a body by 1°C or 1 K. It depends only on the material. Unit: cal/g°C or J/kgK.

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Given: m = 2 kg, c = 500 J/kgK Formula: c' = mc Step 1: c' = 2 × 500 Step 2: c' = 1000 J/K Answer: Heat capacity = 1000 J/K…

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Heat capacity = mass × specific heat capacity Formula: c' = mc Meaning: c' depends on the whole body, while c depends only on the material.