Level 70 Level 72
Level 71

Changes of State & Heats of Reactions


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endothermic process
a process that absorbs heat from the surroundings
exothermic process
a process that occurs with a release of heat to the surroundings and therefore a decrease in the enthalpy of the system (delta h < 0).
heat (q)
energy that transfers from one object to another because of a temperature difference between the objects
law of conservation of energy
energy can be converted from one form to another but can be neither created nor destroyed
surroundings
all parts of the universe other than the system being considered.
system
Object or objects identified when considering how a force or forces affects motion
thermochemical equation
a chemical equation that includes the enthalpy change
Thermochemistry
is the study of the changes in heat energy that accompany chemical reactions and physical changes.
Hess's law of heat summation
if you add two or more thermochemical equations to give a final equation, then you also add the heats of reaction to give the final heat of reaction
molar heat of condensation
the amount of heat released by one mole of a vapor as it condenses to a liquid at a constant temperature
molar heat of fusion
energy required to melt 1 mole of a substance
molar heat o solidification
the amount of heat absorbed by one mole of a liquid as it solidifies at a constant temperature
molar heat of a solution
the enthalpy change caused by the dissolution of one mole of a substance
molar heat of vaporization
energy required to change 1 mole of liquid to its vapor
standard heat formation
the change in enthalpy that accompanies the formation of one mole of a compound from its elements with all substances in their standard states at 25°C