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15 Cards in this Set

  • Front
  • Back
What is thermochmistry?
The study of energy changes associated with chemical reactions.
What is enthalpy?
The total energy or heat content of a system, some of which is stored as chemical potential energy in chemical bonds.
What is an endothermic reaction?
A reaction in which the heat energy is absorbed from the surroudings
What is an exothermic reaction?
A reaction in which heat energy is lost by the chemicals is gained by the surroudings and they get hotter.
An enthalpy change must occur at __________ presssure.
An enthalpy change must occur at constant pressure. Constant pressure numerical values will vary wtih exact conditions. Frequently standarad conditions are assumed.
What equation is used to calculate the amount of heat energy released when a substance cools?
Heat energy = m.s. {delta}T
What is the heat capacity of an object?
The amount of energy required to increase it's temperature by 1 degree Celsius
What is calorimetry?
The technique by which heat changes are measured.
What is Hess's Law?
The total change in chemical potential energy must be equal to the energy lost or gained the system.
What kind of a process is the breaking of a chemical bond?
An endothermic process.
What kind of a process is the forming of a chemical bond?
An exothermic process.
What are bond enthalpies?
Given for the conversion of a gaseious molecule into gaseous atoms.
What is the standard enthalpy change of formation?
The amount of energy evolved or absorbed in the formation of one mole of the compound in its standard state from its constituent elements in their standard states.
What is the standard state?
The form normally found at a temperature of 25 degrees Celsius and a pressure of 101.3kPa
What is the appropriate enthalpy cycle?
Products to Elements in their standard states to Reactants