A student conducts a chemistry experiment that is taking about two hours to complete. He decides to place the reaction vessel over ice to reduce the temperature. What is most likely to happen by cooling this reaction mixture? The reaction rate will decrease. The particles in the solution will collide more frequently due to more kinetic energy. The reaction rate will increase. ○ The reaction rate will increase for a while and then decrease near the end of the reaction.

A student conducts a chemistry experiment that is taking about two hours to complete. He decides to place the reaction vessel over ice to reduce the temperature. What is most likely to happen by cooling this reaction mixture? The reaction rate will decrease. The particles in the solution will collide more frequently due to more kinetic energy. The reaction rate will increase. ○ The reaction rate will increase for a while and then decrease near the end of the reaction.

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter11: Chemical Kinetics

Section: Chapter Questions

Problem 11.99PAE: Substances that poison a catalyst pose a major concern for many engineering designs, including those...

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Substances that poison a catalyst pose a major concern for many engineering designs, including those for catalytic converters. One design option is to add materials that react with potential poisons before they reach the catalyst. Among the commonly encountered catalyst poisons are silicon and phosphorus, which typically form phosphate or silicate ions in the oxidizing environment of an engine. Group 2 elements are added to the catalyst to react with these contaminants before they reach the working portion of the catalytic converter. If estimates show that a catalytic converter will be exposed to 625 g of silicon during its lifetime, what mass of beryllium would need to be included in the design?
. Account for the increase in reaction rate brought about by a catalyst.
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. Explain what it means that a reaction has reached a state of chemical equilibrium. Explain why equilibrium is a dynamic state: Does a reaction really “stop” when the system reaches a state of equilibrium? Explain why, once a chemical system has reached equilibrium, the concentrations of all reactants remain constant with time. Why does this constancy of concentration not contradict our picture of equilibrium as being dynamic? What happens to the rates of the forward and reverse reactions as a system proceeds to equilibrium from a starting point where only reactants are present?
Chemical reactions occur when reactants collide. What are two factors that may prevent a collision from producing a chemical reaction?
Apply collision theory to explain why powdered zinc reacts to form hydrogen gas faster than large pieces of zinc when both are placed in hydrochloric acid solution.
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