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Thermochemistry Heat and Chemical Change
Vocab
28
Chemistry
10th Grade
05/04/2009

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