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# The Rate Law

Review 5

1. Synopsis: The author provides an in depth description of the rate law starting with chemical reactions and transitions to rate law equations , the order of reactions and determining reaction rate.  While describing the rate laws an in depth description of zero order, first order, and second order reactions is provided.  Also in this article an example uses data provided during a post lab and is then utilized to demonstrate the rate law and how to determine what order the reaction is.  Along with multiple formulas provided explanations and step by step instructions describing the process are provided. At the end there are multiple practice problems covering the rate law.

2. The module is not ready to go to Vet 2 level yet.  There are grammatical errors throughout the document, as well as run on sentences. The information is conveyed in a manner that makes it hard for all readers to grasp. Also there is what appears to be an equation or inserted diagram that is still in computer text, either it was not done correctly or its presence is a mistake. The organization of the module is nice but lengthy.

3. Review Details: While the information provided is accurate and helpful this module would help more students if the information was conveyed in a different manner.  The module would be easier to read if it was broken up more with smaller headings.  The fact that this module is song long with only four subheadings makes it overbearing to read. The grammatical issues are not too bad but it would improve the readability of the article if they were fixed. While some believe wikipedia is a credible source I would feel more confident in the work if it came from the author and not just an online encyclopedia. I also wish that the table provided at the end of the work was made by the author rather than wikipedia. One thing I enjoyed was the in depth description of the different rate laws, I believe this would help those who do not yet understand it. The problems that were provided at the end were relevant and a good amount.

Figures Questions (if applicable)

1. Are the images included critical for understanding the results described in the text? Yes
2. Are meaningful figure legends provided? Yes
3. Is each figure referenced by number in the text? No
4. Can you suggest any improvements to the images provided? No
5. Are additional images necessary for understanding the results described in the text? Describe
what additional images would be helpful to you as a reader. The images are necessary for understanding the results in the text because some of the concepts cannot be grasped through calculations it needs to be seen.  Some additional imagery that would be nice is if the author provided a zero order, and second order graph.

Tables Questions (if applicable)

1. Are data presented in tabular format appropriately labeled (meaningful column headings, units) and understandable? yes
2. Does each table have a meaningful title? no
3. Is each table referenced by number in the text? no
4. Is a tabular format the best way to present such data or can you suggest an alternative presentation method? Yes this is the best way to present the data.

Text Questions

1. Is the presentation of results easy to follow? Not quite
2. Does each paragraph have a topic sentence (or are multiple apparently unrelated ideas included in each paragraph – label such paragraphs in the text for the author to revise)? Some do
3. Are there distracting grammatical/spelling errors? (Correct on the paper itself) Yes
4. Is there a logical organization? If not, provide suggestions on an alternative organization. Yes
4. Fix one mistake in the Module: I fixed a run-on sentence and some of the grammatical issues.
5. Plagiarism Checks: There is no evident plagiarism, however due to the material covered some of the phrases matched because there is no other way to reword them.
6. Figure Check:Figures appear to be made in excel, not taken from outside source.
Review 4

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1. Synopsis:    The author introduces rate reaction by saying it the concentration per unit of time. He also shows the rate equation, and how to determine it experimentally. He also explains zero, first and second order, and how to determine it. Practice problem in the end

2. Is the Module ready to go to Vet2 level? No, I don’t feel like it is organized enough, the information is hard to follow, and lengthy. There is one misspelling, and one run on sentence

3. Review Details: The length is too long; I would like to information be more condensed. In the beginning, the author has in-text citation from wikipedia, and also has a table of summary at the end which is also taken from Wikipedia. I think the author should have taken source from academic journal or some education site, but not from wikipedia. The intro is very precise and detail. The section of rate law, the author should make some part in bold, so it will be easier to read. Such as this part.: aA + bB -> cC + dD . I like the part that the author mentions about what each of these orders means in terms of initial rate of reaction effect, and showing how we determine the order from post lab. There is one misspelling: appearnce, it should be fixed. There is one run on : Where now the reaction rate is expressed as a derivative of the concentration of reactant A or product C, with respect to time, t. There are some nice problem at the end.  It will be great to create a terminology section.

Figures Questions (if applicable)

1. Are the images included critical for understanding the results described in the text? Yes

2. Are meaningful figure legends provided? Yes

3. Is each figure referenced by number in the text? Sorry, not sure what this question means?

4. Can you suggest any improvements to the images provided? Series one should change to something more precise

5. Are additional images necessary for understanding the results described in the text? Describe
what additional images would be helpful to you as a reader. Graph shows a zero, first,and second order.

Tables Questions (if applicable)

Table is taken from Wikipedia, the author should make his own.

Text Questions

1. Is the presentation of results easy to follow? no

2. Does each paragraph have a topic sentence (or are multiple apparently unrelated ideas included in each paragraph – label such paragraphs in the text for the author to revise)? yes

3. Are there distracting grammatical/spelling errors? (Correct on the paper itself) yes

4. Is there a logical organization? If not, provide suggestions on an alternative organization. yes

4. misspelling and run on are corrected.

5. Plagiarism Checks: There are a lot of matching phrases. There is a big paragraph shows is matching- Such expression is called the integrated rate law in which the equation expresses the concentration of a reactant as a function of time (remember, each order of reaction has its own unique integrated rate law), however when I google this paragraph, nothing match it. Therefore, there is  no plagiarism.

6. Figure Check:  yes, not taken.

Wen Chung Chou

<form method="post" class="commentDelete" action="/index.php?title=Physical_Chemistry/Kinetics/Rate_Laws/The_Rate_Law&amp;action=comment"> </form>
1. Synopsis: The rate law describes the speed of how fast a reaction occurs. The formula needed to solve for rate in a problem would be to take the change in concentration of A and divide by the change in time for the reaction occur; or, take the chance in concentration of C and divide by the change in time for the reaction to occur.

2. goggled: integrated rate law, zero-order reaction, & radioactive decay. appears to be no plagerism present.

3. I really like the problems & additional problems. It was a great practice review after learning about the rate law. The solution given for the additional problem #2 was also a very good explanation. I understood the problem more after reading your solution. The information given throughout the page was really organized and flowed well. The page was well put together and the topic was very thoroughly taught & corresponds well with information given in our textbook. Improvements to the page, to add the rocket pictures into the module itself & to add some more visuals, like pictures and videos.

4. Mistake: In the introduction, this was edited from "A fast a reaction occurs depend on the reaction mechanism, the step-by-step molecular pathway leading from the reaction to products." to "How fast a reactoin occurs depends on the reaction mechanism....."
Viewing 2 of 2 comments: view all
Reviewer Name: Tuyen Le

1.Synopsis: This module covers the key concept of rate laws, which a sub-topic of kinetics study, and provides sufficient information for readers to grasp the key ideas about rate law and be able to understand the rate at which reactants produce products. Order of reactions like zero-order, 1st order and 2nd order are covered with sufficient details in this module.

3. Review Details: Module provides good amount of information to aid with the understanding of rate law. Decent examples and sample problems are provided and mechanisms for those problems are provided to help those who arenâ€™t yet quite get the main concept. The module is good. However, to make it even better, I recommend creating a category for Terminology to introduce the language of rate laws in the field of Kinetics study. Terms like kinetics, reaction rate, activation energy, integrated rate law, differential rate law, rate determining step, intermediate, reaction mechanism, catalyst, and elementary step should be given with definition. Overall, the module is well written.

4. Fix one mistake in the Module: I read through the module and searched for errors. Errors were minimized.
Posted 21:49, 4 Dec 2009
Reviewer Name: Quynh Nguyen

1. Synopsis: In this module created/edited by Jonathan Torres, he discuss the procedures of determining rate laws. Also, the different equations that can derive the rate laws which are used during the experimental determination of rate law. Torres also presented some examples of problems including data, in order to solve for the values of "m" and "n" to ultimately solve for the overall rate law. Torres also discuss the different orders of reactions; including zero, first, second and third. Examples of different equations to determine the rate for different orders of reactions are also presented. Then finally, a helpful list of practice problems are given for peers to get more practice in order to fully understand the rate law.

2. Keywords: Rate Law (Google), First Order Reaction (Yahoo), Rate Orders (Google).

3. Review Details: Overall, this module was well done. The concepts covered were neatly organized and was clearly explained. The examples were solved correctly, and very helpful. The additional problems at the end for extra practice was a clever and beneficial idea at the end. The module is at a good length and there are not many grammatical errors. A few things that are a bit of a concern is that the formulas and explanations used for both the rate laws and the order of reaction looks like they have been copied and paste from Wikipedia and is not properly cited. Also, the explanation under Experimental Determination of Rate Law is somewhat confusing because Torres brought in new variables substituting for "m" and "n" as "x" and "y". That can throw some people off. Torres could have also provided graphs illustrating the different orders of reactions and how we can decide whether it is zero, first, second, or third order by looking at the graph.

4. Fix one mistake in the Module: I fixed the "1" that was slightly off the center of the chart under the Experimental Determination of Rate Law and the spelling mistake of kinetics.
Posted 23:18, 4 Dec 2009
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