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