“Concentration” for Concept Chemistry by Kristen Gonsoir

List of Materials

gonsoirk — 2014-05-02 02:07:00 UTC

Dilution Dilema Lab Activity—Concentrated solution of methylene blue for use as stock solution, dilute solution of methylene blue for students to use as the unknown, common laboratory glassware

Concentrate on Your Soda Lab Activity—Non-diet light colored soda, common laboratory glassware, hotplate

What’s In Your Soda Presentation—Computer, Internet

Learner Outcomes

gonsoirk — 2014-05-02 02:07:47 UTC

Students will be able to determine the concentrations of solutions empirically and experimentally. After collecting data of the amount of sugar in the different kinds of soda, students will create a computer generated graph comparing and contrasting the amount of sugar in different kinds of soda. Students will include their experimental data and their classmates on the graph.

Active/Cooperative/Authetic

gonsoirk — 2014-05-02 02:12:39 UTC

Active—Students will be engaged in experimentation manipulating variables in both lab activities used with this learning outcome. In the Dilution Dilemma lab, students will design their own lab procedure to determine the concentration of an unknown solution by diluting an amount of known concentration stock solution until its color is similar to the unknown. Students will have to decide what data they need to collect in order to solve the problem. In the Concentrate on Your Soda Lab, students will control the amount of soda they test, the method of separating the parts of the soda, and the type of soda they test.

Cooperative—Students will work in groups of three during the laboratory exercise and in the creation of the What’s In Your Soda Presentation. Students will have to create an experiment design and carry out the design. Students will have to share their data with the other groups in the different classes.

Authentic—Students will create a graph that illustrates the concentrations of sugar in soda. Obesity is a problem in the United States and sugar drinks is a huge source of calories. This project will be authentic as students will be gathering information that can be presented to health classes or family and consumer science classes in discussing healthy choices. This presentation could also be made to elementary students to help educate them to make better choices.

Description of Final Assignment

gonsoirk — 2014-05-02 02:15:21 UTC

Students, working in groups of three determined by the instructor, will create a graph using excel that will show the different concentrations of sugar in soda as reported on the product labels for at least six different sodas. Students will also include the experimentally collected sugar concentrations for all lab groups in their graph. Concentrations should be reported in grams of sugar per 100 mL of soda. Students will also include in their project a written summary of their findings of sugar amounts in soda. Students will also compare their experimental values of sugar to the product label’s reported sugar concentration.

Instructional Procedures

gonsoirk — 2014-05-02 02:16:25 UTC

Students will be presented with initial information about concentration and dilution in a lecture setting. Students will then explore the concept of dilution and quantifying the dilution process with the Dilution Dilemma lab. This lab will be an exploratory lab where students will design their own procedure for determining an unknown materials concentration by using a stock solution of a known concentration. The second activity students will complete in meeting the learning objectives will be the Concentrate on Your Soda lab where students will determine the experimental concentration of sugar in the soda of their choice. Students will be guided in separating the sugar from the water by evaporation and warned of the fine line between sugar separated and sugar burned. The culminating project will be an excel created graph and a presentation created in software of the students choice that details the different product label reported concentrations of sugar in soda. Students are to research a minimum of six different sodas and also report the experimental findings of all student groups in their graph. Students will share their data through google docs or office 365. Students will present their projects to elementary students, health classes, or FACS classes.

Assessment Plan

gonsoirk — 2014-05-02 02:17:27 UTC

The Dilution Dilemma lab will be a completion grade. The Concentrate on Your Soda Lab will have a rubric that analyzes the student’s data table, conclusion, and question answers. The final project will also be graded utilizing a rubric that is given to students prior to the project. The rubric will include things such as completeness, proper graphing techniques, grammar and spelling, and aesthetic appearance.