end and eco reactions

hydrolysis oxidation reduction addition combustion exo and endo thermal decomposition

reactants to products usually have an enthalpy change

the heat energy transferred in a reaction at constant pressure the units for delta h are kjmol-1

energy is transferred to the surroundings

energy is taken in from the surroundings

oxidations combustion displacement reactions neutralisation hand warmers fireworks

thermal decomposition sherbte sports ice packs

measure of heat given out or taken in when a chemical or physical change occurs at constant pressure represented by delta H kj per mole

100kpa 298 k 1 mol dm-3

reactants and [rpoducta

containing equipment and immediate surrounding space

both the system and the surroundings

the enthalpy change when one mole of a substance is produced from its elements under standard conditions ΔHf

when one mole of a substance burns completely in oxygen. with all substances in their standard states

is the energy change associated with the formation of 1 mole of water from a neutralisation reaction ΔneuH

average kinetic of the participanta in a system independent of the number of particles measure with thermometer

total energy of all particles energy of every particle is included dependent on the number of particles heat always flows from high low temp

-flame calorimetry -burn fuel to heat a knwon mass of water -measure temp rise of water assumption-all heat from fuel goes to water

the enthalpy change for a chemical reaction is independent of the route taken