Page 18 - Demo

16
Flinn Lab Activities and Demonstrations
1-800-452-1261
flinnsci.com
Guided-Inquiry Experiments for General Chemistry, continued
Analysis of Food Dyes in Beverages—Laboratory Kit
By: The Flinn Staff
This guided-inquiry lab allows students to utilize spectroscopy and graphical analysis to determine the concentration of dye in a sports drink. The lab begins with an introductory activity in which students prepare a series of standard dilutions of an FD&C Blue 1 stock solution. Students then measure the percent transmittance of each and graph the results to identify an optimum linear relationship among various func- tions (T, %T, log T and A) for a Beer's law calibration curve. A Beer’s law plot of absorbance as a function of concentration may then be used to calculate the concentration of any “unknown” solution. Using this introductory procedure as a model, students design guided-inquiry experiments to determine the concentration of food dye(s) in sports drinks and other consumer beverages. Additional dyes (FD&C Yellow 5 and Red 40) and samples of sports drinks are included in the kit for
optional extension or cooperative class inquiry studies.
Use this investigation to develop—and test—skills in preparing accu- rate serial dilutions, understanding spectroscopic measurements, and
extrapolating from graphical data.
Complete for 24 students working in pairs.
Analysis of Hydrogen Peroxide—Laboratory Kit
By: The Flinn Staff
Does the concentration of hydrogen peroxide deteriorate as it ages? In this guided-inquiry lab, students design an experiment to determine the percent composition of a common “drug store” bottle of hydrogen peroxide using an oxidation—reduction titration.
Students begin by standardizing a solution of potassium permanganate using ferrous ammonium sulfate. This procedure provides a model for a guided-inquiry activity, during which students design a titration experiment to determine the precise concentration of hydrogen peroxide in solution. Additional samples of hydrogen peroxide may be used to allow opportunities for further open-inquiry experiments. Fulfill key learning objectives relating to quantitative analysis, stoichiometry calculations, and balancing redox reactions with this great real-world application that also develops science practice skills for collecting and analyzing data and refining measurements.
Complete for 24 students working in pairs.
Applications of Le Chatelier’s Principle— Laboratory Kit
By: The Flinn Staff
In this guided-inquiry lab, students investigate six chemical equilibrium systems to analyze patterns and trends in the principles, concepts, and definitions of equilibrium.
Students begin with an activity that introduces the properties of a system at equilibrium: the reversible complex-ion reaction between iron(III) nitrate and potassium thiocyanate. Deliberate “stresses,” such as temperature changes and changes in the amounts of reactants and products, are added to the system and students analyze the resulting color changes. This procedure provides a model for guided-inquiry analysis of five additional equilibrium systems. Inquiry activities include a reversible acid−base indicator reaction, copper and cobalt complex ions, gas−liquid solubility of carbon dioxide, and the solubility of magnesium hydroxide. For convenience, these systems may be set up as lab stations. Students may also be tasked to create a rainbow-colored display using the equilib- rium systems as an optional extension or cooperative class activity.
This inquiry lab integrates essential science practice along with analyz- ing evidence based on data to construct explanations of natural phenomena.
Complete for 24 students working in pairs.
Analysis of Food Dyes in Beverages—Laboratory Kit AP7969
Guided-Inquiry Experiments for General Chemistry—16-Kit Bundle
Save by ordering the complete Guided-Inquiry Experiments for General Chemistry—16-kit bundle! Comprehensive, cost-
saving bundle includes all 16 of the kits on pages 15–20.
Catalog No.
Description
Price/Each
AP7983
Guided-Inquiry Experiments for General Chemistry—16-Kit Bundle
$862.00
Catalog No.
Description
Price/Each
AP7969
Analysis of Food Dyes in Beverages—Laboratory Kit
$35.10
Catalog No.
Description
Price/Each
AP7970
Analysis of Hydrogen Peroxide—Laboratory Kit
$56.30
GUIDED-INQUIRY EXPERIMENTS FOR GENERAL CHEMISTRY continued on next page.
Analysis of Hydrogen Peroxide—Laboratory Kit AP7970
Catalog No.
Description
Price/Each
AP7971
Applications of Le Chatelier’s Principle—Laboratory Kit
$77.95
Applications of Le Chatelier’s Principle—Laboratory Kit AP7971