Test 1

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A ______ is a substance that increases the rate of a reaction without being consumed. This type of substance is often used up and regenerated during the reaction.

catalyst

During the course of a reaction, reactant concentrations _____ & product concentrations _____.

decrease increase

Temperature is (directly/indirectly) proportional to rate.

directly

When ΔH > 0, the reaction is...

endothermic

When ΔH < 0, the reaction is...

exothermic

Each reaction has its own characteristic reaction rate, which is determined by the nature of the reacting species. However, reaction rate can be influenced by increasing the _____ & energy of the _____ between molecules.

frequency collisions

A catalyst that is in a different phase than the reactants is a(n) _____ catalyst.

heterogeneous

Ea is (directly/indirectly) proportional to rate.

indirectly

A _____ is a hypothesis

reaction mechanism

A reaction mechanism describes a series of _____ reaction steps that _____ to the overall chemical equation.

single sum

"Ea" stands for...

activation energy


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