29 terms

Chemistry and Heat

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heat
kind of energy involving mass and temperature change
heat content
chemical potential energy
chemical potential energy
energy bound up in structure of molecules
joule
SI unit for energy
calorie
unit of energy equal to 4.18 joules
system
the reactant molecules in a thermochemical equation
exothermic reaction
chemical change in which energy moves from the system to the surroundings
endothermic reaction
chemical change in which energy moves from surroundings to system
change in heat content
final heat content minus the initial heat content
heat of fusion
amount of heat needed to change one mole of a substance from solid to liquid
specific heat
amount of heat needed to change the temperature of one gram of a substance one degree Celsius
heat of combustion
amount of heat released by burning one mole of a fuel
heat of reaction
value which is negative for exothermic reactions and positive for endothermic reactions
c
symbol for specific heat
fusion
change of state from solid to liquid
condensation
change of state from gas to liquid
vaporization
change of state from liquid to gas
freezing
change of state from liquid to solid
melting point
temperature at which a solid changes to a liquid
boiling point
temperature at which a liquid changes to a gas
kilo-
prefix which means 1000
Calorie
1000 calories
oxygen
substance which is always a reactant in a combustion reaction
kinetic
kind of energy which objects have on account of their motion
furnace
device for changing chemical potential energy to heat energy
engine
device for changing heat energy to kinetic energy
heat of formation
amount of energy needed to form a compound from its elements (assumes room temperature conditions)
kelvin
SI unit of temperature
temperature
a measure of how hot or how cold something is