Unit 5: Thermochemistry

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Presentation transcript:

Unit 5: Thermochemistry Specific Heat

Specific Heat specific heat: willingness of an object to change temperature, with the symbol Cp (the p means "under constant pressure") specific heat: the amount of energy required to change the temperature of one gram of a substance by 1°C

Specific Heat Units 1 calorie = energy required to heat 1 gram of water by 1°C 1 Calorie (food labels) = 1 kilocalorie 1 calorie = 4.184 joules

Specific Heat Duluth, next to Lake Superior, stays cool in the summer and relatively warm in the winter. Why? Substance Specific Heat (J/g°C) copper 0.3845 granite 0.7953 lead 0.1276 ice 2.06 water 4.184

Calculating Heat (Energy Transfer) q = Cp x m x T change in temperature (units: °C) specific heat (units: J/g°C) mass (units: g)

Calculating Heat Example #1 q = Cp x m x T 3.05 kg of aluminum is heated from 22.1C to 67.5C. Calculate the heat absorbed in both J and kJ by the metal. The specific heat of aluminum is 0.900 J/gC.

Calculating Heat Example #2 A 200-g block of copper at temperature of 90°C is dropped into 400 g of water at 27°C. What is the final temperature of the mixture? The specific heat of copper is 0.386 J/gC.