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Which one of the following statements is true? O A catalyst alters the equilibrium constant of...
Which of the following statements is incorrect? The slow step in a mechanism generally involves a...
Which of the following statements is incorrect? The slow step in a mechanism generally involves a three-body collision. After the addition of a catalyst, the collision rate between molecules is still the same. Most collisions between reactant molecules do not lead to a product Chemical reactions involve collisions between the participating molecules. A three-body collision is less likely than a two-body collision.
11) Which of the following is true of a catalyst? a) A catalyst is a substance...
11) Which of the following is true of a catalyst? a) A catalyst is a substance b) A catalyst, when added to a reaction system, increases the rate at which the reaction occurs c) A catalyst is neither produced nor consumed as a reaction proceeds d) Both b and c e) Both a and b and c 12) In the Arrhenius equation, the value for A, the pre-exponential factor, depends on a) the collision frequency (number of collisions per unit...
Choose the correct reaction coordinate diagram for a two-step reaction in which the first step is...
Choose the correct reaction coordinate diagram for a two-step reaction in which the first step is endergonic, the second step is exergonic, and the overall reaction is endergonic. Pay attention to the reactants, products, intermediates, and transition states A reactants) B = first transition state C = intermediate D = second transition state E =product(s) Free energy Progress of the action A = reactant(s) B = intermediate C = first transition state D = second transition state E = product(s)...
Which of the following statements describes the theory of Conservation of Orbital Symmetry? Select one: A. The molecular orbital of the transition state must be similar to that of the product. B. A pe...
Which of the following statements describes the theory of Conservation of Orbital Symmetry? Select one: A. The molecular orbital of the transition state must be similar to that of the product. B. A pericyclic reaction requires the overlap of in-phase orbitals. C. The molecular orbitals of reactant and product must have different symmetry. D. Only s orbitals from reactants and products are utilized. E. The molecular orbital of the transition state must be similar to that of the reactant.
10) Which of the following is always true for the oxidation numbers in an oxidation-reduction reaction?...
10) Which of the following is always true for the oxidation numbers in an oxidation-reduction reaction? a) The value for the oxidation number for atoms of the element being oxidized must increase as we go from reactants to products b) The initial value for the oxidation number for atoms of the element being oxidized must be positive c) The final value for the oxidation number for atoms of the element being oxidized must be positive d) Both band c e)...
Which one of the following conditions must be met for an elementary reaction between two molecules...
Which one of the following conditions must be met for an elementary reaction between two molecules to occur? - Collisions between reactant molecules must have enough energy to form the transition state and convert it into products - The reactant molecules must be in a lower energy state than the products - At least one of the reactant molecules must have a double or triple bond - The molecules must be attracted to one another by ionic forces
Which of the following statements is/are correct? 1. A catalyst speeds up a reaction by changing...
Which of the following statements is/are correct? 1. A catalyst speeds up a reaction by changing ∆H, the enthalpy of the reaction 2. Addition of a catalyst to a reaction changes the equilibrium constant 3. A catalyst increases the rates of both the forward and reverse reactions . 3 only B. 2 only C. 2 & 3 only D. none E. 1 & 2 only Which one of the following statements about the overall order of a reaction is correct?...
Which of the following is NOT important as a contributing factor to photochemical smog? stagnant air...
Which of the following is NOT important as a contributing factor to photochemical smog? stagnant air rsunlight a lot of traffic rrigation For the reaction 3 A 5B-2C+4D, the rate of the reaction in terms of written as would be r_1A[A [A] Which statement below regarding the average rate of a reaction is FALSE? The change in concentration of reactant or product is not always linear with time The average reaction rate usually decreases as the reaction proceeds. The average...
Which statements are true regarding reaction rates? [Select all that apply.] 1.Group of answer choices Larger...
Which statements are true regarding reaction rates? [Select all that apply.] 1.Group of answer choices Larger activation energies are associated with faster reaction rates. 2.Higher reactant concentrations are associated with faster reaction rates. 3.Reducing the activation energy for a reaction increases its reaction rate. 4.Reaction rates depend on how likely molecules are to collide in the correct orientation to react. 5.Reactions that give off heat occur rapidly. Reactions that absorb heat occur rapidly. 6.Large changes in enthalpy are associated with...
To understand how elementary steps make up a mechanism and how the rate law for an...
To understand how elementary steps make up a mechanism and how the rate law for an elementary step can be determined. Very often, a reaction does not tell us the whole story. For instance, the reaction NO2(g)+CO(g)→NO(g)+CO2(g)NO2(g)+CO(g)→NO(g)+CO2(g) does not involve a collision between an NO2NO2 molecule and a COCO molecule. Based on experimental data at moderate temperatures, this reaction is thought to occur in the following two steps: NO2(g)+NO2(g)→NO3(g)+NO(g)NO2(g)+NO2(g)→NO3(g)+NO(g) NO3(g)+CO(g)→CO2(g)+NO2(g)NO3(g)+CO(g)→CO2(g)+NO2(g) Each individual step is called an elementary step. Together, these...
Which of the following statements is incorrect? The slow step in a mechanism generally involves a three-body collision. After the addition of a catalyst, the collision rate between molecules is still the same. Most collisions between reactant molecules do not lead to a product Chemical reactions involve collisions between the participating molecules. A three-body collision is less likely than a two-body collision.
11) Which of the following is true of a catalyst? a) A catalyst is a substance b) A catalyst, when added to a reaction system, increases the rate at which the reaction occurs c) A catalyst is neither produced nor consumed as a reaction proceeds d) Both b and c e) Both a and b and c 12) In the Arrhenius equation, the value for A, the pre-exponential factor, depends on a) the collision frequency (number of collisions per unit...
Choose the correct reaction coordinate diagram for a two-step reaction in which the first step is endergonic, the second step is exergonic, and the overall reaction is endergonic. Pay attention to the reactants, products, intermediates, and transition states A reactants) B = first transition state C = intermediate D = second transition state E =product(s) Free energy Progress of the action A = reactant(s) B = intermediate C = first transition state D = second transition state E = product(s)...
10) Which of the following is always true for the oxidation numbers in an oxidation-reduction reaction? a) The value for the oxidation number for atoms of the element being oxidized must increase as we go from reactants to products b) The initial value for the oxidation number for atoms of the element being oxidized must be positive c) The final value for the oxidation number for atoms of the element being oxidized must be positive d) Both band c e)...
Which of the following is NOT important as a contributing factor to photochemical smog? stagnant air rsunlight a lot of traffic rrigation For the reaction 3 A 5B-2C+4D, the rate of the reaction in terms of written as would be r_1A[A [A] Which statement below regarding the average rate of a reaction is FALSE? The change in concentration of reactant or product is not always linear with time The average reaction rate usually decreases as the reaction proceeds. The average...
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