Science Fun

Pot of Gold

coin-animation2

Materials:

  • Bag of chocolate coins
  • Paper plates
  • Pen
  • Paper
  • A watch, clock, or timer
  • A clear plastic cup
  • Black construction paper or black marker

Instructions:

  1. Take the foil off of each chocolate coin you use for the experiment.
  2. Place each chocolate coin on a separate paper plate.
  3. Place paper plates in different spots, for example, one outside in the shade, one outside in the sun, one inside in a dark room, or one inside under a lamp.
    • At each location, place up to 3 plates to see which melts the fastest:

    • 1 white paper plate with just the chocolate coin
    • 1 white paper plate, with a clear plastic cup over it, covering the coin to allow it to trap some heat
    • 1 paper plate, with a black piece of construction paper, or color the plate black with a marker, to see if this absorbs more heat
  4. Using your time keeping device, pen, and paper, record how long it takes the chocolate to melt in each situation. If it doesn’t melt after 10 min of sitting, record that as well.
  5. Compare your results and think about the conclusion to your results.
  6. How it Works:

    At a certain temperature some of your chocolate coins went through a physical change from a solid to a liquid. This process is called melting. Energy was added to the chocolate by either sunlight or heat and this energy caused the molecules that make up the solid chocolate to move about and spread out and become a liquid.

    Extra Experiments:

    1. Use a thermometer to record the temperature of the different spots. Can you figure out what temperature chocolate starts to melt?
    2. Try using other types of chocolate, for example, white or dark chocolate. Do the results change?
    3. How long does chocolate take to melt in your mouth? What temperature is the human body? Does this help prove or disprove your hypothesis on what temperature chocolate melts at?