calorimetry Flashcards
(15 cards)
The amount of heat resulting from chemical reactions can be determined experimentally through
the system of
calorimetry
Calorimetry uses the principle of the _____Law of Thermodynamics:
the amount of heat that was lost from an object or a substance is the same amount as the heat
gained by another.
first
the transfer of thermal energy between two bodies at different temperatures.
heat
(a redundant term, but one commonly used) increases the thermal energy of one body and
decreases the thermal energy of the other.
Heat flow
the amount of energy required to raise one gram of water by 1 degree C (1 kelvin).
Calorie
unit (cal)
The SI unit of heat, work, and energy. defined as the amount of energy used when a force of 1 newton moves an
object 1 meter.
It is named in honor of the English physicist James Prescott ___.
joule.
________ of a body of matter is the quantity of heat (q) it absorbs or releases when it
experiences a temperature change (ΔT) of 1 degree Celsius (or equivalently, 1 kelvin):
C = q/deltaT
Heat Capacity
determined by both the type and amount of substance that absorbs or
releases heat. It is therefore an extensive property—its value is proportional to the amount of
the substance.
Heat Capacity
The heat capacity of one gram of a substance is
Specific heat (c)
When the
reference is one mole o the substance, it is called the
molar heat capacity.
The heat capacity of a substance can be determined experimentally by
measuring the amount of heat energy supplied to the substance and the resulting temperature change
the amount ofenergythat must be added, in
the form ofheat, to one unit of mass of the substance in order to cause an increase of one unit intemperature.
Specific Heat Capacity (Cp) (J/Kxkg)
a device used to measure thermal changes.
calorimeter
type of calorimeter being used to measure the heat
transferred in processes open to atmosphere and is used to find the specific heat capacity of a solid that does not react with or dissolved in water.
The Constant-Pressure Calorimeter
type of calorimeter used to measure precisely the heat released in a combustion reaction.
Constant-Volume Calorimetry (Bomb calorimetry)