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Salty and Sweet Cracker Lab

Salty and Sweet Cracker Lab. Question: Are there organic compounds in foods such as, a cracker or tortilla chip? If so, how are these macromolecules broken down so our body can use them as energy?. What do you taste…?. Put a small piece of cracker or chip in your mouth. DO NOT CHEW!

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Salty and Sweet Cracker Lab

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  1. Salty and Sweet Cracker Lab • Question: Are there organic compounds in foods such as, a cracker or tortilla chip? • If so, how are these macromolecules broken down so our body can use them as energy?

  2. What do you taste…? • Put a small piece of cracker or chip in your mouth. DO NOT CHEW! • Let the cracker dissolve in your saliva. (This could take several minutes.) • Make a T chart. • Left side “I notice” • Right side “I wonder” • Must have qualitative and quantitative observations. (6-8 for each)

  3. Guiding Questions – write in your journal • What do you taste at first? • How is the texture of the cracker or chip changing? • What do you taste after a minute? • Why do you think this is happening?

  4. Explanation – Write in your journal • Sugar and starch are carbohydrates. • Each molecule of carbohydrates is made of carbon, hydrogen, and oxygen atoms. • Energy holds the atoms together and when carbohydrates are broken down the energy is released for use by the body. Also, heat is released.

  5. Explanation • Carbohydrates that can be digested are broken down into smaller molecules by enzymes in the saliva. • Enzymes are chemicals in saliva that break down food. These are also present in the stomach.

  6. Further Organic Compound Investigation • What are the 4 types of organic compounds? • How are these nutrients used by your body?

  7. Questions • Have you ever wondered what’s in your food? • Scientists use a variety of test to determine the organic compounds in food.

  8. Directions • Login to Gizmo. • Launch Identifying Nutrients. • Answer this in a complete sentence in your journal. • How can you determine what organic compounds are in mystery foods?

  9. Collect Data • Glue or copy the data table from Activity B in your journal. • Draw the experimental set up and label.

  10. Analyze • Is sample A most likely to be steak, bread, or butter? EXPLAIN. • Is sample G most likely to be table sugar, pasta, or olive oil? EXPLAIN. • Is sample M most likely to be chicken, rice, or butter? EXPLAIN. • Sample A is most likely to be steak because…(reference data table & test indicators)

  11. Lugol’s Test for Starch • Get a paper towel for you and your partner, a piece of chip, and an eyedropper of iodine solution. • Break up the chip and mound together on the paper towel. Put some drops of iodine on it. • Describe what happens. Explain what this tells you about the chip.

  12. Draw Conclusions • What organic compounds are in a cracker? • What elements make up a carbohydrate? • What happens when carbohydrates are broken down? • Answer the questions in paragraph form and relate this to why your salty cracker began to taste sweet after a few minutes in your mouth.

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