Unit 14 - Thermochemistry
Terms in this set (30)
a unit of energy, typically used to measure the energy content of food.
a unit of energy, typically used in chemical reactions and physical changes.
an insulated device used to measure the energy released or absorbed by chemical or physical changes.
any process which absorbs energy. Feels cold to the touch. q = +
any process which releases energy. Feels warm to the touch. q = -
"q", the amount of energy transferred in chemical or physical changes.
"∆H", a measure of the energy gained or released in chemical reactions and physical processes such as phase changes.
a measure of the vibrations in matter due to thermal kinetic energy. NOT the same as energy, but they are closely related.
Law of Conservation of Energy
"energy can neither be created nor destroyed." Applies to all normal chemical and physical changes except nuclear reactions.
"c", a measure of a substance's resistance to temperature changes. Insulators are high "c", conductors are low "c".
everything outside of the chemical reaction or process being studied.
the reaction or process being measured or studied.
the energy of movement, energy in use.
stored energy, usually in chemical bonds.
a physical process by which matter changes in state between solid, liquid, gas, or plasma.
melting, the phase change from solid to liquid.
boiling, the phase change from liquid to gas.
freezing, the phase change from liquid to solid.
the phase change from solid to gas, with no liquid phase.
the phase change from gas to liquid.
the phase change from gas to solid with no liquid phase.
the phase change from gas to plasma.
the phase change from plasma to gas.
heat of fusion
∆Hfus, the energy that must be absorbed for a solid to melt.
heat of vaporization
∆Hvap, the energy absorbed for a liquid to boil.
heat of ionization
∆Hion, the energy absorbed for a gas to become a plasma.
heat of solution
∆Hsol, the energy gained or released by dissolving substances.
heat of reaction
∆Hrxn, the energy gained or released by a chemical reaction.
heat of combustion
∆Hc, the energy released by the burning of a substance in oxygen.
heat of formation
∆Hf, the energy needed to build a substance from raw elements.
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