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FOOD LAB Purpose: To test food and beverages to find its chemical properties

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Carmen CHONG Date SEPT 10TH 2009 Tiffany SUN Period 7 Mrs. Mulligan Food Lab (What are Foods and Beverages Made of ?) Purpose: To test food and beverages to find it's chemical properties Hypothesis: If a food or beverage is made of a certain molecule then it will react base on the characteristic of that molecule Material: Chemicals Used Food and Beverages Laboratory Equipment Iodine Benedicts Blue and Red Litmus Paper Universal PH paper Biuret-Copper Sulfate Solution(0.5%) and Sodium Hydroxide(10%) Bromthymol Blue (BTB)(0.04%) Phenolphthalein (0.5%) Hydrochloric Acid Distilled Water Egg Yolk Egg White Syrup 7-UP Lemon Juice Milk Flour Potato Flour Safety Goggles Apron Dropper Pipet 12 Test Tubes Test Tube Rack Mortar and Pestle Beaker Spot Plate Test Tube Brush Plastic wash bottle Masking Tape Methods/Procedure: 1. Assign jobs for each group member 2. Wear safety goggles and lab apron 3. Record the list of common food and beverage in left hand column of data table 4. Label test tubes with masking tape 5. Use drop pipet to put in food or beverages in to labeled test tubes 6. For potato-Crush with the mortar and pestle and add a small amount of distilled water to make a 'potato' solution 7. ...read more.


NEG (-) pH7 Purple(+) NEG(-) NEG(-) Blue(+) Red(+) Tofu NEG (-) N/A N/A Purple (+) Yellow(+) NEG(-) NEG(-) Red(+) Flour Blue Black(+) NEG (-) N/A NEG(-) Yellow(+) NEG(-) NEG(-) Red(+) Potato Dark Purple(+) N/A N/A N/A N/A Pink(+) N/A N/A Discussion: 2. You may already know something about what these food and beverages are made of. With your partner, attempt to group the food and beverages into four to nine groups based on what types of molecules you think they may contain. Record your grouping. Protein Carbohydrate Lipid -Egg White -Milk -Tofu -Syrup -7up(Carbon) -Potato -Flour -Lemon Juice -Egg Yolk 5. Compare your results with your initial grouping. Did all the food/beverages react in the same way? If so, what type of molecules do you suspect members of each group contains that are causing the similar reaction? If not, do you have any ideas for a new grouping system? What is the basis of the system? Be prepared to discuss your ideas in a class discussion. No, The result from the initial grouping was different. The food reacted in different ways. The group of carbohydrate reacted differently because starch such as potato and flour are made of polymers of glucose (polysaccharide), while syrup and 7up are monosaccharide. ...read more.


3. Are foods and beverages made of more than one kind of molecule? Which ones? What evidence do you have for your answers? Yes, food and beverages can be made of more than one kind of molecules. The monomers in polysaccharides can breakdown; therefore if the chain in potato broke then there would be sugar molecules in potato too. 4. Draw the structure of a simple protein, starch, sugar, and fat molecule. What evidence do biochemists have that suggests these structures? 5. How does a chemical reaction differ from simply mixing molecules? A chemical reaction will change the properties of the original substances, however simply mixing molecules only creates a mixture and will not change its original properties. 6. In the table below, a + indicates a color change. A blank indicates no change. a. Unknown 1 contains chains of sugar molecules. True b. Unknown 2 contains simple sugar molecules (not in chains). True c. Unknown 3 has a relatively high number of hydrogen ion. Not possible to determine from the available data d. Unknown 4 may be distilled water. True e. Unknown 5 may be distilled water. False f. Unknown 6 has a PH less than 7. Not possible to determine from the available data g. Unknown 7 contains protein but no sugar and has a PH greater than 6. False ...read more.

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