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17 Cards in this Set
- Front
- Back
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Activation Energy
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minimum energy needed to cause a reaction to begin
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Heat of Reaction
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heat of the products --- heat of the reactants
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Sign of endothermic
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+
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Sign of exothermic
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--
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What do catalysts NOT change?
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heat of reaction and equilibrium
-they only allow equilibrium to be achieved quicker |
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CIA
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concentration increase away
-away from the side that has the added concentration |
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TIA
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temperature increase away
-away from the side that has the heat |
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Reactions are driven towards higher/lower entropy?
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higher(more randomness(
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Reactions are driven towards higher/lower heat?
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lower (exothermic reactions favored)
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LeChatelier's Principle
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A system at equilibrium will shift in a predictable way to try to relieve the stress applied
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Three types of stress
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-temperature
-concentration -pressure (gas) |
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Spontaneous change
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are changes that will occur under given conditions
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Factors that affect spontaneous change
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1.) Tendency to change to a condition of less energy
2.) Tendency to change to a condition of greater randomness |
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Tendency for lower energy (spontaneous change)
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-Most spontaneous reactions are exothermic
-The activation energy for an exothermic reaction is less than the reverse endothermic reaction |
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Tendency for randomness (spontaneous change)
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-Randomness is the disorder, or lack of regularity, in a system
-The measurement of disorder in a system is called entropy -Increased disorder means increased entropy |
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Systems go from greater order to
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greater disorder
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What determines the rate of reaction?
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1.) Enough energy
2.) Proper orientation |
