TOPIC: GOOBERS CAUGHT IN A CHEMICAL CHANGE

1. TOPIC: GOOBERS CAUGHT IN A CHEMICAL CHANGE

2. QUESTION TO ANSWER WHAT HAPPENS TO THE INGREDIENTS THAT MAKES PEANUT BRITTLE HAVE A HARD SURFACE?

3. OBJECTIVES • Participate in both chemical and physical changes in an experiment to make peanut brittle. • Identify chemical changes in mixtures.

4. RESEARCH: When a chemical change occurs in a mixture, some signs of that change can be observed. Some of the signs that a chemical change has occurred include: color changes, forming a gas or foaming, temperature changes and the forming of a precipitate (a solid settling out of the solution.)

5. Ingredients • 1  cup  sugar • 1 cup  light corn syrup • ½ cup water • 2cupsshelled raw peanuts • 2  tablespoons  butter • 2teaspoons  baking soda • 1teaspoon  vanilla

6. Preparation • Assemble all the equipment needed for the experiment. • Measure all ingredients and set on counter ready to be added as needed. • Pour water into saucepan and bring to boil. • Add sugar and syrup. • Boil until it “spins a good thread”. • Add peanuts and boil until golden brown and peanuts are cooked. • Remove from heat and add butter, vanilla and baking soda, stir well. • Pour into well buttered cookie sheet, or non-stick cake pan. • Break into pieces when cool. • Store in an airtight container.

7. Describe the appearance of the mixture at the following steps.

8. POST LAB QUESTIONS: 1. Describe the change that occurred in step #4. 2. Describe the change that occurred in step #5. 3. Describe the change that occurred in step #6 4. How do you know a chemical change occurred? 5. What were the signs of a chemical change that you witnessed? 6. Describe the product in step #7if a chemical change had not occurred.

9. CONCLUSION (WRITE A CONCLUSION. DID YOU ANSWER THE QUESTION YOU ASKED?)