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Chapter 6

Thermochemistry

QuestionAnswer
Endothermic reaction __ energy absorbs
Exothermic reaction __ energy releases
The first law of Thermochemistry is: total energy of the universe is constant -always being transferred, never created nor destroyed
Exothermic reaction has a __ delta H negative
Endothermic reaction has a __ delta H positive
The system is the ___ reaction itself
The surroundings are __ solution around the reaction
What is specific heat capacity? amount of heat needed to raise temperature of 1 gram of substance by 1 degree of temperature
In endothermic reactions, bonds are __ breaking
In exothermic reactions, bonds are __ forming
What is internal energy? the sum of kinetic and potential energies
In an endothermic reaction, heat goes from the _ to the __ surrounding -- system
In an exothermic reaction, heat goes from the _ to the __ system -- surrounding
At a constant pressure, enthalpy and heat are: equal
Standard enthalpy is __ deltaH at STP
Heat absorbed or released by a system at a given pressure and temperature is called ____ enthalpy change
qsol = -qrxn
Standard state for a liquid or solid is 1 atm and 25C
Standard state for a solution is 1M
For deltaH reactants, elements in standard state are ___ 0
Units for heat capacity: J degreeC
Units for specific heat capacity: J/gC
Created by: Mariahj25