TOPIC: GOOBERS CAUGHT IN A CHEMICAL CHANGE

QUESTION TO ANSWER

WHAT HAPPENS TO THE INGREDIENTS THAT MAKES PEANUT BRITTLE HAVE A HARD SURFACE?

OBJECTIVES

• Participate in both chemical and physical changes in an experiment to make peanut brittle.

• Identify chemical changes in mixtures.

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.)

Ingredients1 cup sugar 1 cup light corn syrup ½ cup water 2 cups shelled raw peanuts 2 tablespoons butter 2 teaspoons baking soda 1 teaspoon vanilla

Preparation1. Assemble all the equipment needed for the experiment.2. Measure all ingredients and set on counter ready to be

added as needed.3. Pour water into saucepan and bring to boil.4. Add sugar and syrup.5. Boil until it “spins a good thread”.6. Add peanuts and boil until golden brown and peanuts are

cooked.7. Remove from heat and add butter, vanilla and baking soda,

stir well.8. Pour into well buttered cookie sheet, or non-stick cake pan.9. Break into pieces when cool.10. Store in an airtight container.

Describe the appearance of the mixture at the following steps.

STEP APPEARANCE AROMA TYPE OF CHANGE

#4

#5

#6

#7

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 #7 if a chemical change had not occurred.

CONCLUSION

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