17 terms

Thermochemistry chapter 15

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Terms in this set (...)

energy
ability to do work or produce heat
law of conservation of energy
states that in any chemical reaction or physical process, energy can be converted from one form to another, but neither created or destroyed
chemical potential energy
energy that is stored in a substance because of its composition
heat
symbol q which is energy that is in the process of flowing from warmer to cooler object
calorie
amount of energy required to raise temperature of one gram of pure water by one degree celsius. (cal)
joule
si unit of heat (j)
specific heat
the quantity 4.184 j/g•*c
calorimeter
a insulated device used for measuring the amount of heat absorbed or released during a chemical or physical process
thermochemistry
the study of heat changes that accompany chemical reactions and phase changes
system
the specific part of the universe that contains the reaction or process you wish to study
surroundings
everything in the universe other than the system
universe
the system plus the surroundings
heat equation
q=c • m • 🔺T
heat of vaporization
heat of vaporization
The amount of heat required to convert a liquid into a gas at constant temperature and pressure. A gas releases
heat of fusion
the heat absorbed by a unit mass of a given solid at its melting point that completely converts the solid to a liquid at the same temperature
critical point
the point at which a substance in one phase, as the liquid, has the same density, pressure, and temperature as in another phase, as the gaseous.
triple point
the particular temperature and pressure at which the solid, liquid, and gaseous phases of a given substance are all at equilibrium with one another.