Foods+contain+common+chemicals+including+fats,+glucose,+and+starches

__**//Foods contain common chemicals including fats, glucose, and starches//**__
 * Purpose: ** The purpose of this lesson is for students to observe through nutrition labels, and through a series of chemical reactions, that most foods contain common chemicals including fats, glucose, and starches.
 * Objectives: **
 * Students will identify the difference between a carbohydrate, fat, and sugar.
 * Students will verify which biochemical (starch, fat, or sugar) is common in food items through a series of chemical reactions.
 * Students will act as scientists to develop a conclusion about the common chemicals in foods based on their experimental results.


 * Action Plan: **
 * I will ask students to take out their nutrition labels once again and circle with a blue marker any fats, sugars, and carbohydrates. Students will recognize through a lab activity that all foods contain chemicals. Some of the most common chemicals are the nutrients, glucose (sugar), fat, and starch (a carbohydrate). I will verbally explain to students that it isn’t difficult to detect these nutrient chemicals in food.
 * In the next activity, students will use simple tests to determine the presence of nutrient chemicals in everyday foods.
 * Materials: **
 * Plastic spoons
 * Small plastic cups
 * Crackers
 * Marshmallows
 * Peanut butter
 * Apple sauce
 * Brown paper bags
 * Tes Tape (Glucose Test Paper)
 * <span style="background-color: white; font-family: Arial,sans-serif; font-size: 10pt;">Iodine reagent
 * <span style="background-color: white; font-family: Arial,sans-serif; font-size: 10pt;">Forceps
 * <span style="background-color: white; font-family: Arial,sans-serif; font-size: 10pt;">Scissors

<span style="background-color: white; font-family: Arial,sans-serif; font-size: 10pt;"> <span style="background-color: white; font-family: Arial,sans-serif; font-size: 10pt;">**Homework:** Students will write up a lab report that encompasses the purpose of the lab activity, the materials used, procedure, illustration of the observations, the results, and an over-arching conclusion.
 * <span style="background-color: white; font-family: Arial,sans-serif; font-size: 10pt;">Lab Procedure (25 minutes): **
 * 1) <span style="font-family: Arial,sans-serif; font-size: 10pt;">Use one of the plastic spoons to crush one of the crackers on the plate. With the spoon, transfer the cracker crumbs to one of the small cups. Place a marshmallow in another small cup, and use a clean tasting spoon to tear it into small pieces. Add a few drops of water to each cup to create a liquid mixture.
 * 2) <span style="font-family: Arial,sans-serif; font-size: 10pt;">Use the two remaining tasting spoons to place half a spoon of peanut butter and half a spoon of applesauce in the two remaining cups.
 * 3) <span style="font-family: Arial,sans-serif; font-size: 10pt;">Label four of the brown-paper squares with the names of the four foods. Use forceps to rub the second sample of each food against a brown-paper square. Place these on a paper towel.
 * 4) <span style="font-family: Arial,sans-serif; font-size: 10pt;">Label TesTape strips with the name of each food, and then dip it into that food's cup. Place each strip on a paper towel to dry.
 * 5) <span style="font-family: Arial,sans-serif; font-size: 10pt;">Place two drops of iodine (KI reagent) on the food remaining in each cup.
 * 6) <span style="font-family: Arial,sans-serif; font-size: 10pt;">Observe the reactions in each test and record them.
 * 7) //<span style="font-family: Arial,sans-serif; font-size: 10pt;">Observations: After Iodine-KI reagent is tested with the different foods, a blue-black color results if starch is present. If starch amylose is not present, then the color will stay orange or yellow. Starch amylopectin does not give the color, nor does cellulose, nor do disaccharides such as sucrose in sugar. //
 * 8) <span style="font-family: Arial,sans-serif; font-size: 10pt;">Compare your group's results with those of another group.
 * 9) <span style="font-family: Arial,sans-serif; font-size: 10pt;">Now, repeat steps 1-6, and compare them with your initial results.
 * 10) <span style="font-family: Arial,sans-serif; font-size: 10pt;">What other foods would you like to test? Develop a list of 10 additional foods with your group, and arrange to bring them in for testing. Test them using iodine, TesTape strips, and brown-paper squares.