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catalyst decreases the activation energy of a chemical reaction, thereby increasing the effective collisions and hence the rate of the chemical reaction

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Q: What is the effect of a catalyst on the required energy to achieve effective collisions?
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Membrane potential required to achieve threshold?

-55mV


What describes a catalyst?

A character who makes events happen.


Which substance can affect the rate of a chemical reaction without itself being changed or used up during the reaction?

The answer you're looking for is a "catalyst". Unless you are in Chemistry 12, you don't need to know that reaction equations with more than 3 molecules on the reactants' side consist of several steps, in which intermediates (things that are produced/used and involved in the reaction, but are reused or produced before the end) like catalysts come into the reaction. Catalysts influence reaction rate, but do not show up in the final equation of an overall reaction. They are sometimes listed over the "arrow" in the equation. Inhibitors slow reactions, and are the opposite of catalysts in that way. Source - Chem 12 Student under Jim Nattrass


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An increase in weight to the crust due to thickening from plate collisions, build up of sediments, or glacial override will necessitate a corresponding downward movement into the ductile asthenosphere in an attempt to achieve gravitational equilibrium as it applies to the difference in buoyancy between the different Earth layers.. As this weight is removed through erosion or glacial retreat, the crust will gradually rebound to achieve equilibrium.

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