CHEM 121 MODULE 5 EXAM QUESTIONS WITH COMPLETE SOLUTIONS VERIFIED
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Course
CHEM 121
Institution
CHEM 121
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 hi...
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)
, 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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