CHEM 121 MODULE 5 EXAM QUESTIONS WITH
COMPLETE SOLUTIONS VERIFIED
kinetics the study of rates of reactions and how they are influenced by certain factors like concentration, temp, catalysts, and surface area increase of temp causes increase in reaction rate, since the higher temp provides a higher kinetic energy for the reacting particles.catalyst a substance that increases the rate of a reaction without being consumed int he overall reaction (lowers activation energy) increase in surface area causes solid reactant rate to increase due to the increased surface area of the particles of solid reactants (by grinding solid into a fine powder) since solids can only react at their surfaces.increase in concentration causes reaction rate to increase since this provides more of the reacting particles to undergo the next reaction, but occasionally the rxn rate is unaffected (but that is very rare) 1 / 2
rate determining step rate of a reaction is always determined by the slowest step, if slowest step isn't a reactant for example then changing the concentration of rxn wont change the overall reaction rate reaction rate the increase in molar concentration of product per unit of time or the decrease in molar concentration of reactant per unit of time usually expressed in moles per liter per second (mol/L*s) ∆t change in time (defined as tf-ti)
∆[ ]
change in molar concentration (which is defined as conc f - conc i) instantaneous rates...decrease as rxn proceeds since the concentration of reactants becomes smaller due to consumption of reactants and the rate finally becomes 0 as reaction stops rate law a mathematical equation that describes the dependence of the reaction rate on the concentrations of some of the reactants rate laws must be determined...experimentally. and should always be understood that exponents (x) and (y) aren't necessarily equal to the coefficients (a and b) of reactants A and B in the balanced reaction order
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