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Thermochemistry Part 2: Calorimetry.

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© 2012 Pearson Education, Inc. Calorimetry Since we cannot know the exact enthalpy of the reactants and products, we measure H through calorimetry, the measurement of heat flow. © 2012 Pearson Education, Inc.

Heat Capacity and Specific Heat The amount of energy required to raise the temperature of a substance by 1 K (1C) is its heat capacity. © 2012 Pearson Education, Inc.

Heat Capacity and Specific Heat Specific heat, then, is Specific heat = heat transferred mass  temperature change c = q m  T © 2012 Pearson Education, Inc.

Constant Pressure Calorimetry By carrying out a reaction in aqueous solution in a simple calorimeter such as this one, one can indirectly measure the heat change for the system by measuring the heat change for the water in the calorimeter. © 2012 Pearson Education, Inc.

Constant Pressure Calorimetry Because the specific heat for water is well known (4.184 J/g-K), we can measure H for the reaction with this equation: q = m  c  T © 2012 Pearson Education, Inc.

Important calorimetry lab data Your task will be to accurately find the specific heat of a sample of metal Data to collect: mass of water, mass of metal, starting temperature of metal and water, ending temperature of metal and water © 2012 Pearson Education, Inc.

© 2012 Pearson Education, Inc. It’s important to: Let the metal sit in boiling water for several minutes to reach max temp Transfer the metal quickly to the water (in a cup) Allow the water to reach max temp (swirl the cup) then use that temp as your final Remember to collect data before you start © 2012 Pearson Education, Inc.

© 2012 Pearson Education, Inc. After the lab Find the specific heat of the metal Do error analysis to see how close you were to the known specific heat © 2012 Pearson Education, Inc.

The key to understanding calorimetry The heat lost by the metal must be equal to the heat gained by the water. © 2012 Pearson Education, Inc.

© 2012 Pearson Education, Inc. Lab Practice Data for water: m = 120.2g c = ? Starting temp = 22.1C final temp = 25.8C Data for metal m = 62.4g © 2012 Pearson Education, Inc.