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20 Cards in this Set
- Front
- Back
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When sugar dissolves, the entropy.....
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increasesq
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Entropy means...
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Disorder
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Salt crystals forming, as water evaporates represents ____ entropy for the salt, but ____ for the water.
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decreasing; increasing
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Steam condensing is ____ entropy
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decreasing
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Water freezing is ____ entropy
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decreasing
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4 mol + 3 mol reactants → 1 mol + 5 mol product is ___ entropy
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decreasing entropy (because of fewer moles products)
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Gas + gas → liquid is ____ entropy
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decreasing
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Liquid + solid → gas is ____entropy
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increasing
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Gasoline evaporating is ___ entropy
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increasing
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Activation energy is lowered when a ___ is added.
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catalyst
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-ΔH represents an ____ reaction
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exothermic
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+ΔH represents an ____ reaction
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endothermic
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When heat is added to a reaction, then that means it's an ____ reactions
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endothermic
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Products of a lower energy level than reactants means that you have a ___ reaction.
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exothermic
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Energy to get a reaction started (or get "over the hump") is called....
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Activation energy
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Cutting up a reactant into smaller pieces increases reaction rate because....
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surface area is increased: more places for collisions to occur
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Increasing temperature causes reaction rate to ____ because molecules are moving ____.
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Speed up; moving faster; thus collisions occur more frequently and with more force.
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Increasing molarity of reactants causes reaction rate to speed up because....
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more reaction sites exist; more likely that collisions will occur.
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To calculate the enthalpy of a reaction, you subtract who from who?
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Product Energy level minus Reactants Energy leve
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Increasing gas pressure increases reaction rate because it has the same effect as increasing the....
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concentration
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