CHEM 1011 Calorimetry: The Determination of the Specific Heat of a Metal.

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Presentation transcript:

CHEM 1011 Calorimetry: The Determination of the Specific Heat of a Metal

Calorimetry Calorimetry – the science of measuring heat transfer.

Calorimetry Principle of Conservation of Energy- Energy can neither be created nor destroyed in any process, but can be transferred from one part of a system to another

Calorimetry Calorimeter – device used to measure heat – calorimeter cup and thermometer.

Calorimetry Specific heat – the amount of heat needed to raise temperature of 1 g of a substance 1° C. Specific heat is an intensive property.

Calorimetry Specific heat values are generally lower for metals and higher for non-metals (see Table 9.1).

Calorimetry When a given mass of a substance undergoes a temperature change, the equation showing the relationship between quantity of heat, specific heat, mass, and temperature change is Q = SH x m x ΔT ΔT = T final - T initial

Calorimetry Heat lost by one substance is equal to the heat gained by the other. Q lost = Q gained

Conclusions and Calculations

Heat Capacity of the Calorimeter Because calorimeter absorbs heat, must calculate C cal.

Heat Capacity of the Calorimeter Construct graph and extrapolate maximum temperature.

Heat Capacity of the Calorimeter ΔT of cold water and calorimeter = (5) – (3)

Heat Capacity of the Calorimeter ΔT of warm water = (5) – (4)

Heat Capacity of the Calorimeter Heat lost by warm water = (2) x 1.00cal/gºC x (7)

Heat Capacity of the Calorimeter Heat gained by cold water & calorimeter = - (8)

Heat Capacity of the Calorimeter Heat gained by cold water = (1) x 1.00cal/gºC x (6)

Heat Capacity of the Calorimeter Heat gained by the calorimeter = (9) – (10)

Heat Capacity of the Calorimeter Heat capacity of calorimeter, C cal = (11) / (6)

Specific Heat of a Metal Mass of metal = (3) – (2)

Specific Heat of a Metal Construct graph and extrapolate maximum temperature.

Specific Heat of a Metal ΔT of cold water and calorimeter = (7) – (5)

Specific Heat of a Metal Heat gained by calorimeter and water = [(1) x 1.00cal/gºC x (8)] + [C cal x (8)]

Specific Heat of a Metal ΔT of the metal = (7) – (6)

Specific Heat of a Metal Heat lost by the metal = - (9)

Specific Heat of a Metal Specific heat of the metal = (11) / [(4) x (10)]

Specific Heat of a Metal According to the Law of Dulong and Petit, SH metal x gram atomic mass = 6.3 cal/moleºC Rearranged, it becomes gram atomic mass = 6.3 cal/moleºC / SH metal

Specific Heat of a Metal Atomic mass = 6.3 cal/moleºC / (12)