Chemical Reaction Lab Report
Introduction: A chemical reaction involves the breaking and forming of bonds in order to create the necessary energy required to cause movement. Each reaction is catalyzed (an increase in rate because of a present catalyst) by a specific enzyme. Enzymes are able to denature proteins, meaning that a protein loses its original shape by uncoiling, giving it a random, unstructured shape. The pineapple plant contains bromelain which, because of its unique characteristics, keeps gelatin from thickening into the solid, commonly consumed food. That bromelain contains two enzymes that have the capability to digest proteins (proteases). Gelatin receives its structure from collagen (an important protein that provides structure within bromelain), in which
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For identification purposes, number the test tubes “1-4,” and label with the initials of group members.
2. Locate two other groups and prepare one package of gelatin in the measuring cup using 90ml of boiling water and 30 ml of cold water. Stir thoroughly with a spoon until the gelatin is properly dissolved.
3. Place 3 ml of the designated pineapple juice into each test tube. Note: Use a separate pipette for each type of juice, so as to not mix juice types and result in inaccurate conclusions.
• Tube 1- water only
• Tube 2- fresh pineapple juice
• Tube 3- canned pineapple juice
• Tube 4- concentrated pineapple juice (thawed)
4. Add 10 ml of gelatin mixture to each test tube. Shake well to ensure proper mixing and place your samples in the refrigerator overnight using a test tube rack.
5. On the second day, check the contents of each test tube to conclude whether or not the gelatin turned solid.
6. Record your observations appropriately.
Data:
Test Tube Juice State of Test Tube Contents on Day 2
1 Water Solid
2 Fresh Pineapple Juice Liquid
3 Canned Pineapple Juice Solid
4 Concentrated Pineapple Juice
For identification purposes, number the test tubes “1-4,” and label with the initials of group members.
2. Locate two other groups and prepare one package of gelatin in the measuring cup using 90ml of boiling water and 30 ml of cold water. Stir thoroughly with a spoon until the gelatin is properly dissolved.
3. Place 3 ml of the designated pineapple juice into each test tube. Note: Use a separate pipette for each type of juice, so as to not mix juice types and result in inaccurate conclusions.
• Tube 1- water only
• Tube 2- fresh pineapple juice
• Tube 3- canned pineapple juice
• Tube 4- concentrated pineapple juice (thawed)
4. Add 10 ml of gelatin mixture to each test tube. Shake well to ensure proper mixing and place your samples in the refrigerator overnight using a test tube rack.
5. On the second day, check the contents of each test tube to conclude whether or not the gelatin turned solid.
6. Record your observations appropriately.
Data:
Test Tube Juice State of Test Tube Contents on Day 2
1 Water Solid
2 Fresh Pineapple Juice Liquid
3 Canned Pineapple Juice Solid
4 Concentrated Pineapple Juice