Physical Science Chapter 18 lab Materials: - Small sauce pan Thermometer Milk Vinegar Spoon Clean rag Salt Plastic cups and spoons (not really important when doing this at home) Heavy cream Procedure 1. Pour 2 cups of milk into a saucepan and add ½ teaspoon of salt. 2. Heat the milk to about 50ºC. This is about 120ºF. If you don’t have a thermometer, this is about when it gets so hot you can’t leave your finger in it for more than a second. 3. Pour in 2 tablespoons of vinegar and stir. If it doesn’t coagulate, you can add some more. 4. Drain the pan by carefully pouring it into a clean, non-fuzzy piece of cloth (an old, clean T-shirt would work well). 5. Rinse the solid ball under running water for a few minutes or until it stops smelling like vinegar. You will have to squish it and break it up to get all the vinegar out. 6. Break the solid into small chunks and place into enough cups for your entire group. 7. Pour a small amount of cream into each cup and eat. If it is not salty enough, you may add salt. 8. Attach a picture of yourself with the finished product at the end of this Doc. Conclusions: 1. What type of matter is milk? (be sure to give the specific answer) 2. What happened when the vinegar hit the warm milk? What is this process called? 3. After the vinegar was put in, what type of matter did you have? Explain how you know.
