Transcript 281_TABLE_I

TABLE I – HEAT OF REACTION
THESE REACTIONS ARE COMBUSTIONS; O2 (AND A FUEL) ARE
REACTANTS AND CO2 AND H2O ARE PRODUCTS
O2 IS A
REACTANT
CO2 IS A
PRODUCT
H2O IS A
PRODUCT
∆H IS
ALWAYS -,
EXOTHERMIC
TABLE I – HEAT OF REACTION
SYNTHESIS REACTIONS: SMALL SPECIES
COMBINE TO FORM LARGER ONE(S).
THESE REACTIONS ARE EXOTHERMIC (∆H = - ), PRODUCTS HAVE LESS
ENERGY THAN THE REACTANTS AND ARE MORE STABLE.
TABLE I – HEAT OF REACTION
SYNTHESIS REACTIONS: SMALL SPECIES
COMBINE TO FORM LARGER ONE(S).
THESE REACTIONS ARE ENDOTHERMIC (∆H = + ), PRODUCTS HAVE
MORE ENERGY THAN THE REACTANTS AND ARE LESS STABLE.
TABLE I – HEAT OF REACTION
SYNTHESIS REACTIONS: SMALL SPECIES
COMBINE TO FORM LARGER ONE(S).
ENDOTHERMIC
EXOTHERMIC
THESE REACTIONS ARE FORMATION REACTIONS, COMPOUNDS
FORMED FROM ELEMENTAL STATE GAS ELEMENTS. HEAT OF
FORMATION (∆HF)IS EVOLVED OR RELEASED.
TABLE I – HEAT OF REACTION
IONIZATION REACTIONS: ELECTROLYTES
RELEASE COMPONENT IONS INTO SOLUTION.
BASE
IONIZATION,
RELEASES
OH- AS ONLY
NEGATIVE
ION.
SALT
SALT
SALT
SALT
SALT
NEUTRALIZATION
THESE REACTIONS ARE SALT IONIZATIONS THAT OCCUR WHEN
WATER IS ABLE TO FORM MOLECULE TO ION ATTRACTIONS WITH THE
IONS, THUS REMOVING THEM FROM THE CRYSTAL (DISSOLVING).