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27 Cards in this Set
- Front
- Back
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concerned with the heat changes that occur during chemical reactions
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thermochemistry
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the capacity for doing work or supplying heat
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energy
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energy stored within the structural units of chemical substances
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chemical potential energy
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represented by q, the energy that transfers from one object to another bcause of a temperature difference between them
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heat
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the part of the universe on which you focus your attention
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system
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include everything else in the universe
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surroundings
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the system and its surroundings constitute the
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universe
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states that in any chemical or physical process energy is neither created nor destroyed
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law of conservation of energy
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a process that absorbs heat from the surroundings is called an
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endothermic process
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a process that releases heat to its surroundings is called an
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exothermic process
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defined as the quantity of heat needed to raise the temperature of 1 g of pure water 1*C
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calorie
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the SI unit of heat and energy named after an English physicist
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joule
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the amount of heat needed to increase the temperature of an object exacty 1*C
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heat capacity
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the amount of heat it takes to raise the temperature of 1 g of the substance 1*C
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specific heat capacity
specific heat |
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the accurate and precise measurement of heat chnage for chemical and physical processes
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calorimetry
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the insulated device used to measure the absorption or release of heat in chemical or physical processes
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calorimeter
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the heat content is the same as this property
a variable that takes constant pressure into account |
enthalpy(H)
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an equation that includes the heat change
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thermochemical equation
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the heat change for the equation exactly as it is written
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heat of reaction
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the heat of reaction for the complete burning of one mole of a substance
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heat of combustion
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the heat absorbed by one mole of a substance in melting from a solid to a liquid at constant temperature
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molar heat of fusion
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the heat lost when one mole of a liquid solidifies at a constant temperature
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molar heat of soidification
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the amount of heat necessary to vaporize one mole of a given liquid
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molar heat of vaporization
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the amount of heat released when 1 mol of vapor condenses
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molar heat of condensation
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the heat change aused by dissolution of one mole of substance
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molar heat of solution
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if you add two or more thermochemical equations to give a final equation, then you can also add the heats of reaction to give the final heat of reaction
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Hess's law of heat summation
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the change in enthalpy that accompanies the formation of one mole of a compound from its elements with all substances in their standard states at 25*C
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standard heat of formation
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