In: Chemistry
Label each statement as True or False. For false answers, cross out what is false and correct the statement so that it is true.
T or F
a.Reactions are faster at a higher temperature because activation energies are lower. |
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b.It is possible to change the rate constant by changing the temperature. |
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c.Catalyzed and uncatalyzed reactions have identical mechanisms. |
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d.Rates increase with increasing concentration of reactants because there are more collisions between reactant molecules. |
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e.As a reaction proceeds at constant temperature, the rate of the reaction -[R]/t remains constant. |
a.Reactions are faster at a higher temperature because activation energies are lower. |
False, typically, Ea is considered constant under temperature ranges... Then, this is mainly because of more kinetic collisions |
b.It is possible to change the rate constant by changing the temperature. |
True, rate constant "k" changes according to K = -A*exp(-Ea/(RT)) chang ein T change K |
c.Catalyzed and uncatalyzed reactions have identical mechanisms. |
FALSE, catalyzed reactions have much more efficient reaction mechanism, therefore, rate is higher |
d.Rates increase with increasing concentration of reactants because there are more collisions between reactant molecules. |
True, more collissions, more favorable reactions |
e.As a reaction proceeds at constant temperature, the rate of the reaction -[R]/t remains constant. |
Depends on rate of reaction, if Zero order, this is true, otherwise false |