| Assessment Questions: 22 results |
Kinetics : ArrheniusTemp (3 Variations)
The activation energy for the isomerization of cyclopropane to propene is 274 kJ/mol. By what factor does the rate of reaction increase as the temperature rises from 500oC to 550oC assuming all else remains constant? (R = 8.314 J/mol k)
Hint: This is asking for the ratio of rates which is proportional to the ratio of the rate constants, all else being equal.
Kinetics |
Chemometrics
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Kinetics : CompareEnergyProfile (11 Variations)
Consider the following reactions that take place at the same temperature, begin with the same molar concentrations, and whose energy profiles are presented below:
Kinetics
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Kinetics : ArrheniusActEnergy (4 Variations)
The rate constant for the first-order dehydration of tert-butyl alcohol at 500oC is 1.20 x 10 -4 s -1. The rate constant for this process at 600oC is 6.80 x 10 -3 s -1. Calculate the activation energy for this reaction in kJ/mol. (R = 8.314 J/mol K)
Kinetics |
Chemometrics
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Kinetics : ArrheniusRateConst (4 Variations)
CH3CH2NO2  C2H2 + HNO2 Using the graph below, calculate the rate constant for this reaction at 40.0oC.
Kinetics |
Chemometrics
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Kinetics : RateConstantUnits (8 Variations)
The isomerization of CH3NC to CH3CN has a rate constant of 0.46 s-1 at 600 K.
(1) Based on the units of the rate constant, what is the order of the reaction? {1:MULTICHOICE:zero-order#No, that is not correct.~=first-order#Correct!~second-order#No, that is not correct.~third-order#No, that is not correct.}
(2) What is the concentration of CH3CN after 0.20 minutes of reaction if the initial concentration is 0.10 M? {1:NUMERICAL:=4e-4:1e-5#Correct!~%50%4e-4:5e-5#Close, but not quite.}(Do not include units!)
Kinetics |
Rate Law
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Kinetics : RateLawChangeConc (10 Variations)
The rate law for a reaction is rate=k[A][B]. If the concentration of A doubles, the rate of the reaction will do which of the following?
Kinetics |
Rate Law
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Kinetics : IntegratedRateLaw (6 Variations)
The following kinetics information may be useful in answering this problem.
Use the plots below to determine the order of the reaction with respect to A.
Kinetics |
Rate Law
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Kinetics : InitialRateMethod (16 Variations)
Use the experimental data below to determine the rate equation for the following reaction.
Kinetics |
Chemometrics |
Rate Law
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Kinetics : RxnOrder (10 Variations)
For the reaction below, determine the order with respect to each reactant and the overall order.
2NO2(g) + F2(g) 2NO2F(g)
rate = k[NO2][F2]
Kinetics |
Rate Law
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Kinetics : RxnMechanisms (14 Variations)
Experiments show that the reaction of nitrogen dioxide and carbon monoxide
NO2 + CO NO + CO2
has the following rate expression at high temperatures:
Rate=k[NO2][CO]
Is the following mechanism compatible with the experimental information?
(1) NO2 + CO O-N-O-C-O (slow)
(2) O-N-O-C-O NO + CO2 (fast)
Choose the best answer.
Kinetics |
Mechanisms of Reactions |
Rate Law
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Kinetics : ElementRxnRateLaws (13 Variations)
Assume that the equation below represents an elementary reaction. Predict the rate expression (rate law) for this reaction.
CO(g) + Cl2(g) COCl2(g)
Kinetics |
Mechanisms of Reactions |
Rate Law
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Kinetics : ConcVsTimeGraph (8 Variations)
The following graph shows the change in concentration as a function of time for the reaction:
2NO2(g) + F2(g) 2NO2F(g)
What do each of the curves A, B, and C represent?
Kinetics
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Kinetics : FactorsAffectingRate (7 Variations)
Which of the following changes would NOT affect the rate of the reaction of cisplatin with water?
Pt(NH3)2Cl2(aq) + H2O(l) [Pt(NH3)2(H2O)Cl]+ + Cl-
Kinetics
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Kinetics : RxnProfileEaDeltaE (11 Variations)
Based on the reaction profile, what is the energy change for the reaction?
Kinetics
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Kinetics : Enzyme (7 Variations)
Trypsin assists in digestion by breaking proteins down into smaller peptides. However, this process is not as efficient in the presence of fluorophosphates. Identify the role of each of these components.
Enzymes |
Kinetics
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Kinetics : CatalystTrueFalse (7 Variations)
Check the box for each statement about catalysts that is true.
Kinetics |
Catalysis
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Kinetics : CatalyticConverters (4 Variations)
The following table illustrates the changes in emissions requirements for automobiles: | Pollutant | 1970 Emissions | 1990 Emissions | CA ultra-low emissions |
|---|
| CxHy | 1.5 g/mile | 0.25 g/mile | 0.04 g/mile | | CO | 15 g/mile | 3.4 g/mile | 1.7 g/mile | | NOx | 3.1 g/mile | 0.4 g/mile | 0.2 g/mile |
Catalytic converters are used in automobiles to convert pollutants in engine emissions to benign products. Catalytic converters in today's automobiles are made of a porous ceramic brick that has been coated with catalysts, additives, stabilizers, and support materials. Corning has developed bricks that have very thin-walled channels with 600 channels per square inch. Which of the following research goals did they target?
Kinetics |
Catalysis
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Equilibrium : EquilAndRxnRates (8 Variations)
For the reaction of A  B, which of the following statements about the rates of forward and reverse reactions is true at time x?
Equilibrium |
Kinetics
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Kinetics : ExpDataRateConst (16 Variations)
Use the experimental data below to determine the rate constant for the following reaction.
Kinetics |
Chemometrics
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Kinetics : InterpretEnergyProfile (16 Variations)
Use the energy profile below to decide if the following statements are true or false.
Kinetics |
Mechanisms of Reactions
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Kinetics : ElementaryRxnOrNot (9 Variations)
Which of the following reactions could be elementary and unimolecular reactions?
Kinetics |
Mechanisms of Reactions
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Kinetics : IntermediateInMech (15 Variations)
Suppose that for the reaction of nitrogen dioxide and carbon monoxide
NO2 + CO NO + CO2
the following mechanism has been proposed at high temperatures:
(1) NO2 + CO O-N-O-C-O (slow)
(2) O-N-O-C-O NO + CO2 (fast)
Check the box for each species that is an intermediate in this mechanism.
Kinetics |
Mechanisms of Reactions
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