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Ch 11

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 Front Back 1 Calorie 1 kilocalorie = 1000 calories 1 J = 0.239 cal 4.184 J = 1 cal C = q/ M x ?T heat ( joules or calories) / mass(g) x change in temperature (?C) calorie the quantity of heat needed to raise the temperature of 1g of pure water 1?C calorimeter the isulated device used to measure the absorption or release of heat in chemical or physical processes calorimetry the accurate and precise measurement of heat change for chemical and physical processes chemical potential energy energy stored within the structural units of chemical substances endothermic process a process that absorbs heat from the surroundings energy The capacity for doing work or supplying heat Enthalpy (H) the heat content of a system at constant pressure Exothermic Process a heat-dissipating process heat the energy that is transferred from one body to another because of a temperature difference heat capacity the quantity of heat required to change an object's temperature by exactly 1 ?C heat of combustion the heat released during a chemical reaction in which one mole of a substance is completely burned heat of reaction the heat released or absorbed during a chemical reaction; equivalent to h, the change in enthalpy Hess's law of heat summation in going from a particular set of reactants to a particular set of products, the enthalpy change is the same whether the reaction takes place in one step or in a series of steps joule the SI unit of energy; 4.184 J equals one calorie law of conservation of energy energy is neither created nor destroyed in an ordinary chemical or physical process molar heat of condensation the heat,in joules or calories, released by 1 mole of a substance as it changes from a vapor to a liquid at the liquid's boiling point molar heat of fusion the energy,in kilojoules, required to melt 1 mole of a solid molar heat of solidification the heat,in joules or calories, released by 1 mole of a substance as it changes from a liquid to a solid at the solid's melting point molar heat of solution the heat,in joules or calories, released by 1 mole of a substance as it dissolves in water to produce 1 liter of a 1 molar solution molar heat of vaporization the energy, in kilojoules, required to vaporize 1 mole of a liquid specific heat the quantity of heat, in joules or calories, required to raise the temperature of 1 g of a substance 1?C standard heat of formation the change in enthalpy for a reaction in which one mole of a compound is formed from its constituent elements surroundings the remainder of the universe that is outside the system system any part of the universe upon which attention is focused thermochemical equation a chemical equation that includes the amount of heat produced or absorbed during the reaction thermochemistry the study of heat changes in chemical reactions universe the totality of all existing things universe the totality of all existing things
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