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MERLOT II


    

Comment


Material:

Virtual Chemistry Laboratory

Rating: 4 stars
Used in Course: Used in course
Submitted by: Lawrence Roberge (Faculty), Nov 24, 2006
Comment: 1. How did you review the materials? (Did you spend 5 minutes browsing or 2 hours trying it?) Spent about 30 minutes browsing site and performed simple titration lab using HCL and NaOH with Phenolphthalein as indicator (using Buret). 2. The quality of content. (Do the materials accurately present concepts and models that are educationally significant?) The handling of the lab equipment is straight forward and the array of reagents (mostly acids and bases and indicators) provide for the development of a variety of labs on acids, bases, neutralization, indicators, conjugate bases & acids, as well as possible experiments on dilution of acids & bases, and formation of precipitates. Also, the presence of the thermometer and Log of the different ions provides a good tool to teach exothermic reactions between acids and bases as well as the time course of the changes of various ions during the chemical reaction process. I think a brief tutorial is necessary to have students get accustomed to the workshop, using the mouse to gather and handle equipment and reagents, as well as become familiar with the lab bench and pH meter and other log based read outs. 3. The potential effectiveness for enhancing teaching and learning. (If used appropriately, will students learning and faculty's teaching be enhanced?) If used properly, this lab would be very useful in understanding the various lab techniques as well as principles of pH scale and neutralization. I would highly recommend it for online courses or as a practice run prior to having students actually use acids and bases in a real laboratory setting. If properly used as a lab simulator, it could reduce the risks of lab accidents with acids and bases in real laboratory situations. 4. Technical Remarks: Specifically address the following issue: 5. The ease of using the materials. (Will first time users fine it easy to use?) Students will need to have Java applet plug-in present. Before students go to this site, it is suggested that they be referred to www.java.com; test if the have Java, and download the plug-in if they do not. Also, it helps if this is an online course to notify the Tech Help Desk that they may need to assist newer students in downloading the Java plug-in. But, it is STRONGLY urged that any course using this site have a technology requirement (listed in the syllabus) that the student computer already have Java plug-in present. I think a brief tutorial is necessary to have students get accustomed to the workshop, using the mouse to gather and handle equipment and reagents, as well as become familiar with the lab bench and pH meter, temperature, and other log based read outs of ions and presence of gases and solids (e.g. precipitate). One suggestion is a demonstration and then a test lab where student just manipulate the stock bottles to make dilutions of acids and bases (both weak and strong) and read the resultant changes in pH. Also, one other training exercise is to have students fill a beaker from a stock container to get used to the “select as source” and “select as recipient” settings.

Technical Remarks:

Students will need to have Java applet plug-in present. Before students go to this site, it is suggested that they be referred to www.java.com; test if the have Java, and download the plug-in if they do not. Also, it helps if this is an online course to notify the Tech Help Desk that they may need to assist newer students in downloading the Java plug-in. But, it is STRONGLY urged that any course using this site have a technology requirement (listed in the syllabus) that the student computer already have Java plug-in present. I think a brief tutorial is necessary to have students get accustomed to the workshop, using the mouse to gather and handle equipment and reagents, as well as become familiar with the lab bench and pH meter, temperature, and other log based read outs of ions and presence of gases and solids (e.g. precipitate). One suggestion is a demonstration and then a test lab where student just manipulate the stock bottles to make dilutions of acids and bases (both weak and strong) and read the resultant changes in pH. Also, one other training exercise is to have students fill a beaker from a stock container to get used to the “select as source” and “select as recipient” settings.