Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
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
|
