15. Chemical Kinetics

Which of the following best describes the effect of activation energy on a chemical reaction?

Which of the following correctly labels the key features of an energy diagram for a two-step reaction?

Which point on an energy diagram for the reaction A → D represents the transition state?

Which of the following processes is represented by an energy diagram where the products have lower energy than the reactants?

Which of the following is a true statement about an energy diagram for an exothermic reaction?

The activation energy for the reaction NO2(g) + CO(g) → NO(g) + CO2(g) is Ea = 100 kJ/mol and the change in enthalpy for the reaction is ΔH = -250 kJ/mol. What is the activation energy for the reverse reaction?

In an energy-profile graph, the activated complex is represented at the:

The activation energy of a reaction is 3.5 kJ/mol and the change in enthalpy for the forward reaction is -67.2 kJ/mol. What is the activation energy of the reverse reaction?

An energy diagram for a chemical reaction shows seven distinct regions (bins) labeled as follows: (1) Reactants, (2) Activation energy, (3) Transition state, (4) Intermediate, (5) Second activation energy, (6) Second transition state, (7) Products. Which type of reaction does this energy diagram most likely represent?

In fluorescence, how do the energies of excitation and emission compare? Which is greater?

Which of the following best describes the qualitative energy diagram for the dissolution of LiI in water?

In an energy diagram for a chemical reaction, what does the 'energy hill' represent?

Which concept is commonly illustrated using energy diagrams to explain activation energy and how chemical reactions proceed?

If an enzyme increases the rate of the hydrolysis reaction by a factor of 1 million, how much lower must the activation energy barrier be when sucrose is involved?

The activation energy of a reaction is 3.5 kJ/mol and the change in enthalpy for the forward reaction is -67.2 kJ/mol. What is the activation energy of the reverse reaction?