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define energetics:
energy changes during chemical reactions
what is an exothermic reaction? describe the diagram for an exothermic reaction
a reaction in which heat energy is given off
what is an endothermic reaction? describe the diagram for an endothermic reaction
a reaction in which heat energy is taken in
what is enthalpy?
a measure of the heat content of a substance
represented by the symbol H
what are the units for enthalpy?
kJ mol-1
what is enthalpy change?
change in heat content at constant pressure
represented by ΔH
what are standard conditions for a reaction?
100 kPa
stated temp (usually 298K)
constant pressure (1 bar/100kPa)
represented by ΔHƟf
what is the standard enthalpy change of formation of a compound? how is it represented?
the enthalpy change which occurs when ONE MOLE of the compound is formed from its ELEMENTS under STANDARD CONDITIONS and w/ everything in its standard state
represented by ΔHƟf
what is the standard enthalpy change of combustion of a compound? how is it represented?
the enthalpy change which occurs when ONE MOLE of the compound is BURNED COMPLETELY in oxygen under STANDARD CONDITIONS and w/ everything in its STANDARD STATE
represented by ΔHƟc
what is the specific heat capacity equation?
q = mcΔT
what is the equation for ΔH?
ΔH = q/moles
what is calorimetry?
the process of measuring the amount of heat energy released/absorbed during a chemical reaction