# Ch 12 Txt

 chemical kinetics the area of chemistry concerned with reaction rates and the sequence of steps by which reactions occur To describe a reaction rate, we must specify __. What is the rate? how fast the concentration of a reactant or a product changes per unit timerate= concentration change/ time change reaction rate either the increase in the concentration of a product per unit time or as the decresae in the concentration of a reactant per unit time rate=delta[x]/ deltat What are units for rates Molar per second M/s Why do we define reaction rate in terms of concentration (moles per liter) rather than moles? because we want the rate to be independent of the scale of the reaction The steeper the slope of the hypotenuse, the __ faster the rate Reaction rate is defined as a __ positive quantity The general rate of a reaciton equals the rate of consumption of a reactant or formation of a product divided by its coefficient in the balanced chem equation The slope of the tangent to a concentration-versus-time curve at a time t is called the __ at that particular time. The instantaneous rate at the beginning of a rate (t=0) is called the __. instantaneous rateinitial rate what is the rate law? rate= - delta[A]/ deltat= k[A]^m[B]^n What does an exponent of one indicate? the rate depends linearly on the concentration of the corresponding reactant What does m=0 mean? the rate is independent of the concentration of A because any number raised to the zeroth power equals one If m is negative, __ the rate decreases as [A] increases The values of the exponents m and n determine the __ with respect to A and B, respectively. The sum of teh exponents (m+n) defines the __. reaction orderoverall reaction order The values of the exponents in a rate law must be determined by __; they cannot be deduced from the __ of the reaction. experimentstoichiometry One method of determining the values of the exponents in a rate law--the __--is to carry out a series of experiments in which the initial rate of a reaction is measured as a function of different sets of initial concentrations. method of initial rates first order reaction one whose rate depends on the concentration of a single reactant raised to the first power What is the integrated rate law? ln[A]t/[A]0= -kt [A]0 is initial time concentration A graph of ln [A] versus time is a __ having a slope of __. The value of hte rate constant is simply equal  to __. straight linem=-k-(Slope) First order reaction graphs? the exponential decay is the same for every interval AuthorAnonymous ID205446 Card SetCh 12 Txt DescriptionTest TWO Updated2013-03-06T22:01:53Z Show Answers