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30 Cards in this Set
- Front
- Back
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Taking a Goody's™ aspirin powder works faster than an aspirin tablet. This the concept of increasing the reaction rate by....
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increasing surface area
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Increasing surface area increases reaction rate because it...
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increases the number of places where collisions can occur
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Increasing the pressure of a gas (by decreasing the volume) ____the reaction rate
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increases
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Increasing the pressure of a gas (by decreasing the volume) increases the reaction because it makes the particles ___ together.
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closer
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Making particles closer together (because of reduced gas volume) can increase the chance that ____ will occur.
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collisions
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Increasing pressure of a gas (by decreasing gas volume) has the same effect at increasing the ___ of the substance.
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concentration
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A piece of steel wool burns slowly in air (20% O₂) and brilliantly, quickly burns in 100% O₂. This method of increasing reaction rate is the concept of increasing....
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concentration of reactants.
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Increasing concentration of reactants speeds reaction because....
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particles are closer together,
collisions are more likely to occur, there are more reaction sites |
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Increasing temperature speeds reaction by ...
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speeding up motion of the particles, making them collide more frequently and with more force.
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Reaction speed doubles when it warms by 10ºC.This is the concept of speed increasing as ....
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temperature increases.
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A slow reaction is sped-up by addition of a chemical. This the concept of increasing reaction rate by use of a ....
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catalyst
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A ____ is a chemical that speeds up a reaction but itself is not consumed in the reaction.
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catalyst
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What is the energy level of the products?
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30 J
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Which numbered region indicates the activation energy for the uncatalyzed reaction?
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2
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Which numbered region indicates the energy level of the activated complex?
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5
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Which numbered region indicates the activation energy needed for the catalyzed reaction?
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3
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Calculate the enthalpy for this reaction.
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ΔH = P - R = 30 - 120 = -90 J
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Is this reaction endothermic or exothermic?
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exothermic
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Is this reaction exothermic or endothermic?
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endothermic
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Calculate the enthalpy for this reaction.
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ΔH = P - R = 75-25 = 50 J
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Suppose ΔH = +130 J. Is it exothermic or endothermic?
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endothermic
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What effect does adding a catalyst have?
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It reduces the activation energy?
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What is the name of ΔH ?
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Change in enthalpy
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What does enthalpy mean?
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energy of reaction
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If reaction energy is higher than product energy then the reaction is considered to be...
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exothermic
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Suppose ΔH = +130 J. Is it exothermic or endothermic?
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endothermic
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What effect does adding a catalyst have?
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It reduces the activation energy?
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What is the name of ΔH ?
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Change in enthalpy
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What does enthalpy mean?
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energy of reaction
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If reaction energy is higher than product energy then the reaction is considered to be...
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exothermic
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