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Activation energy is _____.

the heat released in a reaction
the energy given off when reactants collide
generally very high for a reaction that takes place rapidly
an energy barrier between reactants and products

User Acrophobia
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Answer:

an energy barrier between reactants and products

Step-by-step explanation:

User Revolutionary
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Activation energy is _____

an energy barrier between reactants and products

User Grebneke
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