Chapter 4 Properties of Matter

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ex. 4.1 If 1638 J raise the temperature of 125 g of the solid from 25.0 o C to 52.6 o C, calculate the specific heat in J/g o C. heat 1638 J specific heat = ──── = ───────── g × Δt (125 g)(52.6 – 25) o C = 0.475 J/g o C ex. 4.2 a metal with a mass of 212 g is heated to 125.0 o C, and then dropped into 375 g water at 24 o C. the final temperature of water is 34.2 o C. specific heat of metal heat gain by water = (375 g)(10.2 o C)(4.184J/g o C) = 1.60 × 10 4 J heat 1.60 × 10 4 J specific heat = ──── = ───────── of metal g × Δt (212 g)(125 – 34.2) o C = 0.831 J/g o C 10
4.7 Energy in chemical changes in chemical changes, matter either absorbs or releases energy • electric energy produced in lead storage battery • light energy in light stick • heat and light are released from combustion of fuels • electrical energy is used in electroplating of metal • radiant energy is used by green plants in photosynthesis 11
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Chapter 4 Properties of Matter

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