WHAT EXACTLY IS IN YOUR FOOD?
Name: _______________________________		Date: ______________________
1. Complete the chart below by indicating the chemicals used to test for each nutrient.     Complete the last column of the chart by indicating the colour change that occurs for a positive test for each nutrient.
NUTRIENT	CHEMICAL INDICATOR	COLOUR OF INDICATOR	COLOUR FOR POSITIVE TEST	
Carbohydrate - Monosaccharide		Blue		
Carbohydrate - Polysaccharide		Orange		
Protein		Blue
		
Lipid		Red

2.  Complete the chart below by placing a (+) for a positive test result and (-) for a negative test result in the spaces provided.  Use the words “yes” or “no” to determine what nutrients are present.
	Carbohydrate Test	Protein Test	Lipid Test	Test Results – Are these Nutrients Present?	
Food Sample	Benedict’s Test	Lugol’s Test	Biuret Test	Sudan Red Test	Monosaccharide	Polysaccharide	Protein	Lipid	
0	+	+	-	-	Yes	Yes	No	No	
A									
B									
C									
D									
E									
F									

3.  If one of the above food samples was apple juice, which test results would be positive?

4. If one of the food samples was a meal replacement protein shake, which test results would be positive?           

5. A student takes a sample of protein, adds Biuret Reagent and then heats the test tube.  The student notices a colour change from violet to blue.  Explain why heating caused this colour change.

6. You tested the following food samples during this lab.  Match the food item with the sample letter.
Salmon				Oatmeal			Peach
Whole Milk			Chocolate Chip Cookie		Margarine

7.  Which food item(s) above would have the components of a balanced meal?               Explain.

8.a)  Which compound is most common in foods that come from plants?

b)  Which compound is most common in foods that come from animals?

9.a)  Which of the foods tested above would your body use for a quick burst of energy?

b)  Which of the foods tested above would your body use when no carbohydrates are        available?

c)  Which of the foods tested above would your body use for building body parts?

10.a)  If you tested olive oil using the above indicators, what result would you expect?  

b)  Olive oil is an unsaturated fat. Does the Sudan Red Test differentiate between saturated   and unsaturated fats?