Chapter16 :P Joy
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| Thermochemistry | is the study of the transfers of energy as heat that accompany chemical reactions and physical changes
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| Calorimeter | the energy absorbed or released as heat in a chemical or physical change is measured in a calorimeter.
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| Temperature | is a measure of the average kinetic energy of the particles in a sample of matter
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| The ______ the _____ energy of the particles in a sample, the higher the temperature feels. | greater, kinetic
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| Celsius and Kelvin Temperatures are related by the following equation | K = 273.15 + °C
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| A ________ is the SI unit of heat as well as all other forms of energy | joule
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| The joule is derived from the units for force and length in what equation? | N x m = kg (m^2) / s^2
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| Heat | the energy transferred between samples of matter because of a difference in their temperatures
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| Specific Heat | is the amount of energy required to raise the temperature of one gram of a substance by one Celsius degree (1°C) or one kelvin ( 1 K).
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| Cp represents what? | Specific Heat
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| q stands for? | the energy lost or gained
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| m stands for? | mass
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| ΔT stands for | the difference between the initial and final temperatures
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| To find the Cp you need what equation? | q / m x ΔT
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| to find q what equation is most useful? | q = cp x m x ΔT
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| What is the Cp of water? | 4.18 J/g(K)
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| The energy absorbed by heat during chemical reaction at constant pressure is called | enthalpy
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| Enthalpy is represented by ? | ΔH
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| Enthalpy Change | the amount of energy absorbed by a system as heat during a process at constant pressure
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| What equation represents Enthalpy change? | ΔH= H products- H reactants
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| Enthalpy of reaction | the quantity of energy transferred as heat during a chemical reaction
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| Because energy is released the reaction is.... | exothermic
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| Because the energy is absorbed and the products have a larger enthalpy than the reactants they are.. | endothermic
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| Thermochemical equation | an equation that includes the quantity of energy released or absorbed as heat during the reaction as written
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| In an exothermic chemical reaction, the enthalphy change is ____meaning energy is released from the system as heat. | negative
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| In an endothermic chemical reaction, the enthalpy change is ______ because energy is absorbed into the system as heat | positive
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| The physical states of reactants and products must always be included in thermochemical equations because... | they influence the overall amount of energy as heat gained or lost
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| In endothermic reactions ΔH is always | positive
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