chap 16 chemical energetics Flashcards
(14 cards)
unit of energy
kilojoules (kJ)
endothermic absorb or release thermal energy?
absorb
does products have more or less energy than reactants in endothermic process
more
does temperature of surroundings in endothermic process drop or increase
drop
does exothermic absorb or release thermal energy to surroundings
release
does the product have more or less energy than reactants in exothermic?
less
does the temperature of surrounding drop or increase in exothermic
increase
when chemical bonds are broken, energy is…?
absorbed, endothermic
when chemical bonds are formed, energy is …?
released, exothermic
what is bond energy
the amount of energy absorbed when one mole of chemical bond is broken or released when one mole of chemical bond is formed
what is activation energy
the minimum energy that reacting particles must possess in order for a chemical reaction to occur
for a reaction to occur, reactant particles must collide with? (2)
energy greater than or equal to activation energy and correct orientation
what is enthalpy change
the amount of heat given out or taken in during the chemical reaction
how to find enthalpy change
total energy of product - total energy of reactants
