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Chapter 6
Thermochemistry
| Question | Answer |
|---|---|
| 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
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