module 14 Flashcards
reaction rate
the rate of change of a product in a chemical reaction
reaction kinetics
the study of how fast a reaction proceeds
in order to react, chemicals must
collide with one another so that their electrons can either be transferred or rearranged
higher temp increases chemical reaction rate because
the reactant molecules (or atoms) move faster, increasing the chance for collision
decreasing concentration decreases the chemical reaction rate because
there are fewer reactant molecules (or atoms) to collide with one another
increasing the surface area of a reactant – the reaction rate because the molecules (or atoms) of the reactant can :
more easily mingle with the molecules (or atoms0 of the other reactants
sometimes the rate of a chemical reaction will be.. In this case, the exponent of the rate equation is – for that reactant
unaffected by the concentration of one of its reactants
Zero
the reaction rate orders for a chemical reaction must be determined
experimentally
the reaction rate orders for a chemical reaction are not equal to
the stoichiometric coefficients in the chemical equation
instantaneous rate
the rate calculated from the rate equation
at the instant the reactants have the concentration we used, the rate will be what we calculate
chemical reactions never actually
finish. Thus, for any chemical reaction, there will always be some reactants left
the temp dependence of reaction rate is determined by
the variation of the rate constant with temp. since the rate constant increases with increasing temp, the reaction rate does as well.
the rate of many chemical reactions doubles for every– increase in temp
10 C
catalysts
speed up the reaction rate without getting used up in the chemical reaction
a catalyst speeds up a chemical reaction by
reducing the activation energy of that reaction
