Term
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Definition
The heat energy absorbed or released by a chemical reaction.
· Symbol: Delta Hp where Delta stands for the change in, H is
enthalpy, and p stands for the chemical process.
· This value is defined for a reaction that has occurred under
constant pressure.
· If Delta H is negative the reaction is exothermic and energy can be
written in the reaction on the product side.
· If Delta H is positive the reaction is endothermic and energy can be
written in the reaction on the reactant side. |
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Term
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Definition
The device used to determine the heat associated with
a chemical reaction. |
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Term
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Definition
In going from a particular set of reactants to a
particular set of products, the change in enthalpy is the same
whether the reaction takes place in one step or in a series of
steps.
· Based on the fact that Energy is a state Function |
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Term
| Characteristics of Enthalpy Changes |
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Definition
If a reaction is reversed, the sign of delta H is also reversed.
· The magnitude of delta H is directly proportional to the quantities
of reactants and products in a reaction. If the coefficients in a
balanced reaction are multiplied by an integer, the value of delta H
is multiplied by the same integer. |
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Term
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Definition
Decayed organic material that has been converted over
millions of years into a useable high energy compound. |
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Term
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Definition
a thick, dark liquid composed mostly of compounds called
hydrocarbons that contain carbon and hydrogen. |
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Term
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Definition
Consists mostly of methane, but it also contains
significant amounts of ethane, propane, and butane. They are
petroleum molecules in a gaseous state at room temperature. |
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Term
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Definition
formed from the remains of plants that were buried and
subjected to high pressure and heat over long periods of time. Solid
compound with high useable energy stored in the bonds. |
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Term
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Definition
The warming of earth due to the presence of
carbon dioxide, water, and other greenhouse gasses in the
atmosphere.
· Energy in the form of light passes through the gas going into the
earth.
· The light energy is absorbed by the earth
· The light energy is converted to thermal (heat) energy
· The thermal energy is released by the earth to go back in space
· This time the gas traps the energy. |
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Term
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Definition
Energy Spread Exothermic is Preferred
Matter Spread Disorder is preferred |
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Term
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Definition
a function we have invented to keep track of the
natural tendency for the components of the universe to become
disordered. |
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Term
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Definition
A process that occurs in nature without
outside intervention |
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