Unit 6
Multiple Choice
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14 Terms
breaking bonds
uses energy
forming bonds
gives off energy
system
changing bonds of molecules
endothermic
energy taken in for breaking > energy given off for forming (positive enthalpy)
exothermic
energy taken in for breaking < energy given off for forming (negative enthalpy)
phase changes
any change from less ordered to more ordered states is exothermic bc forming bonds releases energy
energetically favorable
going from higher to lower energy state
thermal equilibrium
average KE between two objects is the same (measure via temp)
to draw equilibrium line on graph
split the difference between high temp and low temp objects
heat capacity
amount of energy required to raise the temperature by 1 degree C or K (varies by substance, mass x c)
specific heat capacity
raising 1 g of substance by 1 degree (J/g degree C/K)
molar heat capacity
1 mol raised by 1 degree (J/mol degree C/K)
enthalpy of reaction
(sum of BE of bond broken) - (sum of BE of bonds formed)
has an enthalpy of formation of 0
pure elements in their standard states
