18.2- THE RATE EXPRESSION AND ORDER OF REACTION Flashcards
What does the rate of a chemical reaction depend on?
conc. of some or all of species in reaction vessel- reactants + catalysts
What does the rate expression tell us about?
the contribution of the species that affect the reaction rate
What is the rate expression the result of?
experimental investigation
What is the rate expression?
equation that describes how the rate of reaction at particular temp depends on conc. of species involved in reaction
What is the symbol for the rate constant?
k
How does the value of k vary?
different for every reaction and varies with temp
What is the order of reaction, with respect to one species?
power to which the conc. of that species raised in rate expression
What does the order of reaction tell us?
how rate depends on conc. of that species
What is the overall order of a reaction?
sum of orders of all species, which appear in rate expression
Is the unit of the rate constant always the same?
no it varies
