Test 1
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
