science test chapter 20 Flashcards
reactants –> products
chemical equation
matter can never be created or destroyed
law of mass conservation
how quickly reactants change to products
reaction rate
what is need for a reaction
collision orientation, kinetic energy
what 3 things affect reaction rate
- concentration of molecules
- temperature
- catalysts
how is catalyst affected by reaction
not affected at all
dispersion of energy
entropy
where does dispersed energy go
changes forms, goes from concentrated places to concentrated places
substance that lowers needed energy without being destroyed
catalyst
what is a bad catalyst
CFC or chlorine
what is a good catalyst
catalytic converter
amount of energy needed to break a bond, or amount of energy released when a bond is formed
bond energy
two types of bond energy
exothermic, endothermic
energy is absorbed
endothermic
energy is released, favored for reactions
exothermic
formula for net energy
net energy = energy absorbed + energy released
exo or endo:
net energy is negative
exo
exo or endo:
reaction container becomes cooler
endo
exo or endo:
energy is included before the arrow in a chemical equation
endo
exo or endo:
rocket ship lifts off
exo.
exo or endo:
amount of energy released is less than energy absorbed
endo
exo or endo:
photosynthesis
endo
exo or endo:
net energy of a reaction is +769
endo
breaking of bonds
energy barrier
