Ch 10 Heat pgs. 357 - 386.

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Presentation transcript:

Ch 10 Heat pgs. 357 - 386

Specific Heat Capacity Each substance has a unique value for the energy required to change its temperature Specific Heat Capacity – the amount of energy required to change the temperature of 1 kg of a substance by 1°C

Specific Heat Capacity (cp) Units are J/kg°C

Specific Heat Capacity To measure the specific heat of a substance, you must measure the mass, temperature change and energy transferred as heat

Specific Heat Capacity Use calorimetry to determine specific heat Calorimetry – an experimental procedure to measure the energy transferred from one substance to another as heat

Specific Heat Capacity Specific heat of water is used to find the specific heat of an unknown object Energy Energy absorbed by water = released by substance Qw = Qx cpwmwΔTw = cpxmxΔTx

Specific Heat Capacity Two sides of the equation A side loses energy (temperature goes down) A side gains energy (temperature goes up) The side losing energy should be negative

A 0. 050 kg metal bolt is heated to an unknown initial temperature A 0.050 kg metal bolt is heated to an unknown initial temperature. It is then dropped into a beaker containing 0.15 kg of water with an initial temperature of 21.0°C. The bolt and the water then reach a final temperature of 25.0°C. If the metal has a specific heat capacity of 899 J/kg•°C, find the initial temperature of the metal.