energetics Flashcards
enthalpy changes
the heat energy transferred n a reaction
when in a rection exothermic
enthalpy change is negative
when is a reaction endothermic
enthalpy change is positive
what re the standard condistions
100KP and 25C
what is the mean bond enthalpy
average anergy needed to break a certain bond in a range of compounds in the gaseous state
what is the standard enthalpy of formation
enthalpy change when one mole of a compound is formed from its elements in their standard states
what is the standard enthalpy of combustion
the enthalpy change when one mole of a substance completely burned in oxygen under standard conditions
what is HESSs law
the total enthalpy change is independent of the rout taken
what is on the bottom of HESS diagram in a formation reaction
the elements in their standard states pointing to what them form to
hat is on the bottom of a hess diagram in a combustion reaction
combustion products with the reactant and products pointing to what they combust to
what si the equation for caliometry
Q=mc/\T
how to convert celcious to kelvin
add 273
