Zero-Order ReactionsTable of contentsNo headersPlease add Reviews in the Comments Section below, there is no Poll currently.
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Galaxy Mudda? says:
this module is pretty good and detailed but i think it can use some modification.
in the second paragraph where you give us the diffrential form of the rate law, i think you shoul've first written the generic form which is rate = k [A]exp (n) and explain what the rate law tells us and what n means ( and that in this case it's equal to zero). indicating why we are integrating the rate law ( prior to doing all the integration) may also help. It would also be good to have an example of a zero order reaction. Posted 17:39, 9 Mar 2009
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Heather Voigt says:
Module Title: ZERO ORDER REACTIONS
Module Author(s): RACHAEL CURTIS Specific Questions: (1) Does the module fall within the scope of the Journal? YES (2) Are any statements made which you consider unjustifiable? NO (3) Are there any apparent errors of fact or logic? NO (4) Is the length of the module appropriate? YES (5) Is the summary informative? YES (6) Are the figures appropriate?UES (7) Is the module format useful (e.g. not excessive colors or awkward formulations)? YES Recommendation: 2) Publish with minor revisions Synopsis: THIS MODULE BEGINS WITH A BRIEF DESCRIPTION OF A ZERO ORDER REACTION. THEN IT SHOWS US THE INTEGRATED AND DIFFERENTIATED RATE LAWS. THEN IT SHOWS US HOW TO GRAPH ZERO ORDER REACTIONS AND FINALLY IT EXPLAINS THE RELATIONSHIP BETWEEN ZERO ORDER REACTIONS AND HALF LIFE. Specific Points to fix: IN THE INTRODUCTION, YOU SHOULD DEFINE WHAT A RATE IS IN MORE DETAIL, OR PROVIDE A LINK WHERE READERS CAN BRUSH UP. ALSO, YOU SHOULD PROVIDE READERS WITH A SIMPLER FORM OF A RATE.. i.e. rate = k[A]exp(n). EXPLAIN THAT IN THE CASE OF A ZERO ORDER REACTION n=0. YOU ALSO NEED TO ADD SOME SAMPLE ZERO ORDER REACTIONS SO READERS CAN VISUALIZE WHAT YOU ARE TRYING TO EXPLAIN. Posted 20:06, 28 May 2009
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Adam Abudra says:
Chem 2C Module Review
Module Title: ZERO ORDER REACTIONS Module Author(s): RACHAEL CURTIS Specific Questions: (1) Does the module fall within the scope of the Journal? THE MODULE FAILS TO CITE AN REFERENCES (2) Are any statements made which you consider unjustifiable? NO (3) Are there any apparent errors of fact or logic? NO, THE FACTS APPEAR TO BE LOGICAL (4) Is the length of the module appropriate? YES (5) Is the summary informative? YES, IT GIVES A NICE INTRODUCTION TO ZERO-ORDER REACTIONS (6) Are the figures appropriate? YES, THEY'RE VERY HELPFUL AND USEFUL. (7) Is the module format useful (e.g. not excessive colors or awkward formulations)? YES. Recommendation: Select one:2) Publish with minor revisions Synopsis: THIS MODULE COVERS ZERO-ORDER REACTIONS BY DISCUSSING WHAT THE INTEGRATED RATE LAW IS FOR SUCH A REACTION AND WHAT A GRAPH OF A ZERO ORDER REACTION LOOKS LIKE. THE MODULE ALSO DISCUSSES THE RELATIONSHIP BETWEEN THE INTEGRATED RATE LAW AND HALF-LIFE. Details: I FEEL AS THOUGH THIS ARTICLE IS VERY WELL DONE HOWEVER IT IS LACKING IN REFERENCES. THE GRAPHS ARE VERY HELPFUL AND NICELY DONE. THERE COULD BE MORE EXAMPLES ESPECIALLY ONES THAT INCLUDE HOW TO DETERMINE WHAT ORDER A REACTION IS FROM EXPERIMENTAL DATA. Specific Points to fix: 1- REFERENCES AND JOURNAL ARTICLES ARE NECESSARY. 2- THE MODULE IS LACKING IN PRACTICE PROBLEMS. 3- LINK RELATED TOPICS TO ACTUAL CHEMWIKI MODULES 4- AN EXAMPLE FROM EXPERIMENTAL DATA WOULD BE EXTREMELY HELPFUL. 5- EXAMPLES AND PRACTICE PROBLEMS WILL HELP STUDENTS PRACTICE WHAT THEY HAVE JUST LEARNED AND FURTHER BUILD THEIR SKILLS. Posted 12:39, 29 May 2009
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Courtney Coit says:
The only correction I can make is grammar. As stated on the talk page the module says "The slope of the line is a remains constant" instead of The slope of the line is constant or the slope of the line remains constant.
Posted 18:20, 3 Dec 2009
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Cathy Nguyen says:
Reviewer Name: Cathy Nguyen
1. Synopsis: Zero-order reaction is a reaction that begins at a rate that is proportional to the rate constant, K, and independent of the reaction concentration. The increase or decrease in concentration does not cause the reaction’s speed to increase or decrease. Students can integrate from the differential form of the rate law to the integrated form of rate law through integration. Students can recall from calculus to formulate the integrated form of rate law. The first graph of the differential form of the rate law has the same form as a basic equation. The slope of the line is a negative slope. The other graph showed a straight line, which means the reaction rate is independent of the concentration of reactant. Lastly, the relationship between zero-order reactions and half-life is the time for the initial concentration to be reduced by half and the integrated form of the rate law. 2. Keywords: Keywords: Bolded Keywords: Proportional, Independent and Concentration. No plagariasm found. 3. Review Details: The format of the module was very informative and accurate. It provided logical steps that helped students understand the topic. It helped beginning students who needs clarification, and for continuing students who needs verification. The module also provided graphs that clarified the topic. However, there are no examples or practice problems that could actually be useful. The length was good and the English was correct. 4. The word “Requred” was misspelled, and was changed to required. edited 11:38, 4 Dec 2009 Posted 03:37, 4 Dec 2009
Tianyuduan says:
Reviewer name: Tianyu Duan 1. Synopsis: Zero-order reaction was defined as a process in which the rate acts independently with the reaction concentration. This idea differs from first and second order reactions as well. The author uses the differential forms of the rate law to further explain the zero-order reaction. Furthermore, the graphs of the zero-order reactions demonstrate that the rate is completely separate from reaction concentrations. Lastly, the module examines the relationship between half-life and zero-order reactions, stating that initial concentration of rate constant and the reaction is dependent on the half-life. 2. I would say this module is not ready to go to VET 2 level. There weren't any spelling errors. However, all the module really told me was that in zero-order reactions, rate and reaction concentrations were independent. It needs to show how the zero-order reaction is applied, especially examples of using zero-order to solve chemistry problems. 3. Review Details: To begin, the format of this module is good. It follows chronologic order; it follows logic sense. Yet, I find that the module is too short, to efficiently explain the concepts of Zero-order Reaction. Additionally, this module lacked figures, it lacked tables, and examples. I feel like the author should have put some example problems to accentuate the ideas being presented. Having how the module is different from first and second order reactions is important too. There were a couple grammar issues, include the units of K [are], etc. Text Questions
4. Fix: Changed the unit of K [is] and fixed an awkward sentence, "half-life is a time scale in which the initial population is decreased by half". 5. Plagiarism: Scanned with: www.articlechecker.com No plagiarism detected www.dustball.com No plagiarism detected www.google.com No plagiarism suspected 6. Figure Check: The module had graphs, but they were not labeled as figures. When scanned when Tineye, nothing came up. However, the reverse image search is quite unreliable as even commercial images can come up empty. However, I am positive that these images of graphs were not taken from commercial sites. kristink says:
REVIEWER: Kristin Kee
1. SYNOPSIS: The purpose of this module was to inform readers about reactions that could potentially be of the zero order. Zero-order reactions are those in which the reaction rate is not affected by either the concentrations of reactants or products, but is instead equal to the rate constant, k. In opposition to the rate of the reaction, the half-life of a zero-order reaction does depend upon the initial reactant concentration. By simply plotting the concentration vs. time, one can see that it displays a straight line (with a negative slope) similar to a graph of a linear function. In reality, a zero-order reaction will never have its reactant's concentration become negative (because that is impossible), instead the concentration will eventually tail-off rather than continuing on to a negative value.
2. VET2?: There are no spelling errors present within the module. I feel that the organization works well for this module. Also, information is accurate and true. Before moving on to the next level, I think that smooth introductions and conclusions to each section within the module could be established for a better flow.
3. REVIEW DETAILS: The length of this module is very appropriate and it provides a sufficient amount of information with regards to the topic at the same time. One improvement that could be made would be to transition from section to section within the module much smoother by adding introduction/concluding sentences rather than abruptly starting/stopping and moving on with presenting material. I really like how the contributor of this module provided a clear, step-by-step integration of the rate law to make it easier for readers to understand and follow. Same goes for the half-life equation, the step-by-step process is extremely helpful. The figures used within the text are helpful and critical towards understanding a zero-order reaction. Figures were mentioned and used, but they were not referenced by numbers (I had fixed this problem by adding figure numbers and captions and making reference to them within the module). There is excellent logical organization present within the module. Another improvement that could be made to this module is to add sample problems (along with their answers) to have readers try on their own in order to be sure they understand the material. Sample problems/exercises are great tools for learning! Also, in the second section (The Integrated Form of the Rate Law) the writer tells readers to "see rate laws and rate constants". I feel that it would definitely help to have associated links there in order to make it easier for readers to navigate to this information the writer is speaking of.
5. PLAGIARISM CHECK: No plagiarism is present.
6. FIGURE CHECK: Figures are not taken from any sites.
Posted 17:14, 28 May 2010
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Synopsis: This module provides a clear explanation of what a zero-order reaction is. It also explains how we can use the characteristics of these reactions to obtain equations for half-life's and rate constants. And the fact that the rate of the reaction does not have any dependence on the concentration of the reactants present.
Keywords: 1. Zero-order reactions(google)
2. Half-life (google)
3. Concentration (bing)
Review Details: Overall the format of the module is very efficient. It is very easy for a reader to move from section to section and to follow the course of the formulas outlines. However, I feel as though the explanations could have been a little longer. For example, half-life was mentioned and it's most basic definition was given, but it seems that it may leave a reader a little to be desired. If the purpose of this was to be used as a teaching tool, it seems as though there should have been some problems added to the bottom of the module to ensure the understanding of the formulas derivations and integrations. There were a few grammar mistakes including "The slope of the line is a remains" instead of the slope of the line remains, and "Independent of concentration of reactant" instead of independent of the concentration of the reactants. Overall, this was a well written module, the addition of an example of a zero-order reaction may have also supplemented the material present.
One module Edit (also posted as comment on the actual page): "The slope of the line is a remains constant...." should either read "The slope of the line is constant..." or "The slope of the line remains constant...." edited 19:04, 3 Dec 2009
1. Synopsis: This page went over the topic of zero order reactions. These reactions are different from first and second order reactions. There is an equation which can be rearranged to incorporate all the important information. Graphs are used to better understand the relation between concentration and time. There is also a connection between the zero order reaction and the half life. This relationship can be seen in the equation which was provided on the page.
2. Ready?: There were no spelling errors, the only grammar problem was the repetition of the word “when” (“when when”). After a little more is added and a few small problems are fixed, it will be ready for the next level.
3. Review Details: The first thing I noticed that was missing was example problems. I think one thing you could do to improve this page is to add some example problems. There are a few equations which were provided, which is helpful for understanding the topic, but adding examples would help the reader to better understand how to use these equations for actual problems. For the related topics, it would be helpful to link them to their related wiki pages. This way people could easily go to the related pages without having to search around for them. Another thing is that the page claims this reaction is independent of the reactant concentration. I believe that this is for a first order reactions, not a zero order. The [A]o is the initial concentration and it can be seen in the “relationship between half-life and zero-order reactions” section. I thought it was good how you showed the equation and how it was rearranged to be something which is easier to work with. The graphs were also very helpful for understanding the connections between concentration and time.
4. Fix: For one of the topics under “related topics” I added a link. This same thing can be done with all of the topics in the section.
5. Plagiarism: I checked the content of the page on the different plagiarism sites and found that it didn’t contain plagiarized material.
6. Figure Check: I checked the pictures, however, the site said there were zero results. I was surprised by this, but after rechecking, I have come to believe that it shows that they were not copied.
1. Synopsis: This module explains what a zero-order reaction is and how to determine the rate of a zero-order reaction. It explains that the rate of such a reaction is constant and is independent of the substrate concentration. It also provides detailed steps about how the rate law of a zero-order reaction is derived. This module also explains how to determine the half-life of zero-order reactions and states that the half-life is dependent on the initial substrate concentration.
2. Vet2 Level: No, I do not believe that this module is ready to move to the Vet2 level. There were several grammatical-type errors. After the wording is revised a bit, then this module will be ready.
3. Review Details: The format of the module is good in that it contains an introduction and appropriate sub-headings. The information is relevant and useful. The length of the module is not too long or too short.
Figures: The figures are helpful in understanding the content of the module. All of the figures are labeled and referred to in the text.
Table: The table is well-organized and positively contributes to the module.
Text: The wording of the module is not always clear nor does it always flow well. There are several English mistakes. Also, a question is posed in the middle of the module that seems out of place and that is not answered. Since this module is for learning purposes, the authors of the module should explain the answer to the question posed. The same is true for the Questions and Answers at the end of the module. Although the answers are provided, I would like to see the problems worked out to better facilitate understanding by the reader. Lastly, I think the subsection “Integrated Rate Law” needs some improvement. Although the equations are correct, not each step is straightforward.
4. Mistakes: I corrected “is” to “are.” I also corrected “Zeroth Order” to “Zero-Order” and deleted some duplicate words.
5. Plagiarism: The below websites were used to search for plagiarism – none was detected. The CHE 107B textbook for Winter 2010 was also reviewed for plagiarism; none was found. Key words were googled and plagiarism was not found.
http://www.articlechecker.com/
http://www.dustball.com/cs/plagiarism.checker/
http://www.plagiarismchecker.com/url
6. Tineye.com was used to determine if any of the images were taken from commercial sites; all searches turned up zero results.