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39 Cards in this Set

  • Front
  • Back
types of energy
heat, sound, light, mechanical, chemical, electrical, nuclear, kinetic, potential
transducer
something that converts one form of energy to another form of energy
energy
the ability to do work
2 types of reactions
endothermic and exothermic
endothermic
absorbs heat and temp decreases
exothermic
releases heat and temp increases
which way does heat travel
from higher temp to lower temp
spontaneous
happens w/o energy
not spontaneous
uses energy
matter
anything that has mass and takes up space
what are all changes accompanied by
changes in temp.
homogenous
uniform
heterogeneous
not uniform
extensive physical properties
says how much you have of something
intensive physical properties
view of something
boiling pt and freezing pt..chemical or physical properties?
physical
endothermic phase changes
solid-->liquid-->gas
(SLG)
exothermic phase changes
gas-->liquid-->solid
(GLS)
what keeps water molecules apart
attraction between molecules
energy of activation
energy needed to start a reaction (EA)
what does the heat in a. endothermic phase change do?
break the bonds-energy stored in the bonds is released
potential energy and stability
more potential energy=less stability
A+B---->C
products/reactants?
A+b are reactants
C is product
in an exothermic reaction, it the potential energy greater in the reactant or the product over time?
potential energy is greater in hte reactant
in an endothermic reaction, is the potential energy greater in the reactant or the product over time?
potential energy is greater in the product
two other names for delta H
1. heat of reaction
2. enthalpy
formula for heat of reaction
ProdPE-ReactantsPE/
PEp-PEr
(product's potentail energy-reactants potential energy)
exo/endo negative or positive heat of reaction
exo=positive h of r
endo-negative h of r
where is the first time you see liquid water on a heating curve
0 degrees
when does the water end
100 degrees
what is teh relationship between temp and kinetic energy
direct
heat energy formula
Q=m(delta)TC
specific heat
4.18 J/g K
heating curve is what kind of reaction
endothermic
cooling curve is what kind of reaction
exothermic
scientic name for freezing
crystallization/solidification
exothermic phase changes
freezing (crystallization/solidification) and condentation
scientic name for melting
fusion
endothermic phase changes
melting (fusion) and vaporization (boiling)