Chemistry: Matter and Change
1st Edition
ISBN: 9780078746376
Author: Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher: Glencoe/McGraw-Hill School Pub Co
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Which step has the highest activation energy?
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- By which of the following mechanisms does a catalyst operate? a. It decreases the activation energy barrier for a reaction. b. It serves as a reactant and is consumed. c. It increases the temperature of a reaction. d. It increases the concentration of reactants.arrow_forward. Account for the increase in reaction rate brought about by a catalyst.arrow_forwarduse the kineticmolecular theory to explain why an increase in temperature increases reaction rate.arrow_forward
- Define these terms: (a) unimolecular reaction (b) bimolecular reaction (c) elementary reaction (d) overall reactionarrow_forwardApply collision theory to explain why increasing the concentration of a reactant usually increases the reaction rate.arrow_forwardDraw an energy diagram graph for an endothermic reaction where no catalyst is present. Then draw an energy diagram graph for the same reaction when a catalyst is present. Indicate the similarities and differences between the two diagrams.arrow_forward
- Why are enzymes important? For example, what is the importance of the enzyme carbonic anhydrase in the body?arrow_forwardConsider a reaction in which E a=129 kJ and H=29 kJ. In the presence of a catalyst, the activation energy is 48% of the uncatalyzed reaction. Follow the directions in Question 71 in drawing an energy diagram.arrow_forwardHow does an increase in temperature affect rate of reaction? Explain this effect in terms of the collision theory of the reaction rate.arrow_forward
- In general, what is the relationship between reaction rate and reactant concentration?arrow_forwardWhat is the role of the activated complex in a chemical reaction?arrow_forwardIf a textbook defined a catalyst as "a substance that increases the rate of a reaction," would that definition be adequate?arrow_forward
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