University:
University of Pennsylvania
Course:
CHEM 1012 | General Chemistry I
Academic year:

2021
Views:

368

Pages:

1
Author:

Hallie Randolph

+4pts → 17.5 / 21 Chemistry Quiz #3 Re-Do Question #3a Correction: In terms of the collision theory, heated molecules move faster, so there is a higher probability that more molecules will collide with one another at increased rates, meaning they will collide more often. At this point, molecules will begin to react with one another. Once they begin reacting, they will become more stabilized. As a result, the average Kinetic Energy of molecules increases (shown below in red), so the number of molecules that will react also increases and surpasses the Activation Energy (Ea) as shown in the diagram below. OK [Diagram of a graph showing a kinetic energy/number of molecules diagram, where a red line is higher at "hot" and is labeled "Ea"] Redundant of what? (not a result of reacting...) +2 3a Reflection: In my original answer, I stated that the molecules stopped colliding with one another when the product became stable. This was an incorrect statement because molecules never stop colliding, they are constantly in motion. In terms of activation energy, I became confused with the role temperature played on collisions. I originally thought that higher temperatures lowered the activation energy to allow more molecules to react, yet, it does not change activation energy at all. Heat affects molecules by increasing Kinetic (motion) energy and that makes more molecules able to react. Thus, this now supports the collision theory of molecular movement and reaction rates. Question #3b Correction: When an enzyme is added to increase the rate of a reaction, it does so by binding with the active site of the substrate through induced fit. As binding occurs, the reaction rate increases and the maximum number of molecules are able to react due to the lowering of Ea by the enzyme. In this particular situation, if a substance becomes heated to any certain point (in this case 37°C), denaturation occurs. Here, the bonds holding the tertiary structure begin to break. As a result, the enzyme becomes unable to function properly and thus causes the reaction rate to decrease as shown in the original diagram. +2 Why? (Shape...) Reflection #3b: I had difficulty with this concept question because I was unsure of the process of denaturation. Through discussion with classmates, I learned that I had the right idea that bonds get broken but did not have valid reasoning as to how or why this occurred. I wasn't making cross-content connections to previous units of study of on 3° structures. It makes sense now to think that if the side chain atoms of the tertiary structure are broken, then the enzyme can not do its job of increasing the rate at which molecules react. After re-examining the original graph, it shows how the rate dramatically decreases after a certain temperature illustrating that the enzymes are no longer catalyzing the reaction.

Quiz # 3 Re-do

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