Thermochemistry Heat and Chemical Change Flashcard

Thermochemistry
heat changes that occur during chemical reactions
Energy
The Capisity for doing work and supplying heat
Chemical potential energy
Energy stored within the structural units of chemical substances
Heat
Represented by “q”, Is the energy that transfers from one object to another because of temperature differances between them
System
Part of the universe on which you focus your attention
Law of conversion of energy
Any chemical or physical process, energy is neather created or destroyed.
Endothermic process
A process that obsorbs heat from the suffoundings
Exothermic Process
A process that releases heat into its surroundings
Calorie
A quantity of heat required to raise temperature of 1 g of pure water to 1 degree Celcius
Heat Capasity
The amount of heat needed to increase temperature of an object exactly 1 dagree celcius
Specific Heat Capacity ( Specific Heat)
Amount of heat its takes to raise the temperature of 1 g of a substance to 1 dagree celcius.
Calorimetry
the accurate and precise measurement of heat change for chemical and physical process
Calorimiter
An insulated device that is used to measure the absorbion or release of heat in chemical or physical processes
Enthalpy
For systems at constant pressure, the heat content is the same property
thermochemical equation
An equation that includes the heat change
Heat reaction
Heat change for anequation exactly as it’s written
Molar heat of solidification
heat lost when 1 mole of liquid solidifies at a constant temperature
Molar heat of fusion
Heat obsorbed by 1 mole of a substance in melting from a solid to a liquid at constant temperature
Molar heat of vaporization
Energy required to vaporize 1 mole of a substance
Molar heat of condensation
amount of heat when 1 mole of vapor condences
Molar heat of solution
Heat caused by dissolution of one mole of a substance
Hess’s law of heat summation
If you add 2 or more thermochimical equations to give one final equation, then you can also add the heats to get one final heat of reaction.
Phase Diagram
Gives conditions of temperature and pressure at which a substance exists as a solid
Tripple point
all three phases exist in equilibrium
sublimation
from solid to vapor
Vaporization
gat to vapor
Evaporation liquid to a gas
normal boiling point
substance boils at 101.3 kpa

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