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the ability to do work or produce heat
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states that energy cannot be created or destroyed
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Chemistry

Chapter 15 test

QuestionAnswer
the ability to do work or produce heat energy
states that energy cannot be created or destroyed law of conservation of energy
energy flowing from a warmer to a cooler object heat
the study of heat changes from chemical reactions and phase changes thermochemistry
energy stored in a substance because of its composition chemical potential energy
heat required to raise the temperature of one gram of a substance by one degree celcius specific heat
an insulated device measuring the heat absorbed or released during a chemical or physical process calorimeter
the system plus surroundings universe
states that spontaneous processes always proceed in such a way that the entropy of the universe increases second law of thermodynamics
everything in the universe other than the system suroundings
the change in enthalpy in a chemical reaction enthalpy (heat) of reaction
a balanced chemical equation that includes the physical states of all reactants and products and the energy change that accompanies the reaction thermochemical equation
a system's heat content at constant pressure enthalpy
energy required to vaporize one mole of a liquid molar enthalpy (heat) of vaporization
energy required to melt one mole of a solid molar enthalpy (heat) of fusion
the enthalpy change for the complete burning of one mole of a substance enthalpy (heat) of combustion
the SI unit of heat and energy joule
how many calories does one joule equal? 1 joule = .2390 calories
how many joules are in 1KJ? 1000J = 1KJ
energy needed to raise the temperature of 1g of pure water to 1 degree celcius calorie
how many calories are in one Calories (kilocalorie)? 1000 calories = 1 Calorie
how many joules are in one calorie? 1 calorie = 4.184 joules
what does each letter represent in the equation q = mcΔT? m = mass c = specific heat triangle = delta
enthalpy is negative and energy is a product exothermic
enthalpy is positive and energy is a reactant endothermic
specific part of the universe that contains the reaction of process you wish to study system
Created by: random567
 

 



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