Question
please answer all
17 When the concentrations of reactant molecules are increased, the rate of reaction increases. The best explanation for this phenomenon is that as the reactant concentration in e best explanation for this phenomenon is that as the reactant concentration increases, A) the average kinetic energy of molecules increases. B) the frequency of molecular collisions increases C) the rate constant increases. D) the activation energy increases. E) the order of reaction increases. Section: 13.4 18. Which one of the following changes would alter the rate constant (k) for the reaction 2A +B products? A) increasing the concentration of A B) increasing the concentration of B increasing the temperature D) measuring k again after the reaction has run for a while Section: 13.4 19.For the chemical reaction system described by the diagram below, which statement is true? Energy Reaction Progress The forward reaction is endothermic. The activation energy for the forward reaction is greater than the activation energy for the reverse reaction. At equilibrium, the activation energy for the forward reaction is equal to the activation energy for the reverse reaction. The activation energy for the reverse reaction is greater than the activation energy for the forward reaction The reverse reaction is exothermic. A) B) C) D) E) Section: 13.4
Explanation / Answer
17) The frequency of molecular collisions increases.
18) Increase in temperature.
19) The activation energy for the reverse reaction is greater than the activation energy for the forward reaction.
