# TLW explain density as it relates to mass by inference and asking yes or no questions of the teacher.

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1 Discrepant Event: Density Demo Objective: TLW explain density as it relates to mass by inference and asking yes or no questions of the teacher. Materials: Two eggs (it is a good idea to have extras on hand) Two clear cups or beakers that will hold an egg and water Distilled water Table salt Food coloring (optional) Electronic balance Preparation & Procedure: 1. Add approximately ten tablespoons of salt to one cup and then add distilled water to both cups until they are ¾ full. 2. You may want to add food coloring to the water and/or change the colors of the eggs. Doing so may change up the questions that the student will ask and possibly not make the answer too simple 3. Before the activity verify an egg will float or remain suspended in the salt water and that the salt is completely dissolved. 4. Make sure that all of the students are in a good position to see the cups and ask them What do you think will happen when I put these eggs into the water? Targeted response They will both sink! some may say They will float! 5. Place the eggs in the water. One egg should sink and another (the cup with the salt water) will float or remain suspended in the solution.

2 6. Tell the students that they may ask any yes or no questions to discover why this event is happening. 7. Students will ask questions to formulate a hypothesis. Once they have adequate information, ask the students Which one, if any, will weigh more? and them have them share their hypotheses with the class. 8. After receiving the hypotheses, mass the cups. 9. For older students: Discuss the connection between mass and density (d=m/v) and why the egg floats or sinks respectively. Explanation: The egg in the salt water will float due to the higher density of the water. In the activity we have greater mass and equal volume. Thus, the density of the salt water was increased to that of greater than the egg. Therefore the egg will float or remain suspended in the solution. (Density=mass / volume) The volume does not change, but the mass does. Because the mass is increased with the addition of salt, and the relationship between density and mass is directly proportional, the density will increase.

3 Discrepant Event: Center of gravity Spinning Egg Objective: TLW identify center of gravity as the attribute that causes discrepant events in hard-boiled eggs and raw eggs by observing their behavior. Materials: 1) Raw Egg 2) Hard-boiled egg 3) Flat table 4) Paper towels (for possible clean-up) Preparation & Procedure: 1) Ask students how it is possible to tell the difference between a hard-boiled and raw egg without breaking the egg. 2) Try any feasible student suggestions. 3) If no one has suggested spinning the eggs, suggest it. 4) Spin the eggs 5) Ask which one they thought was able to spin faster. Why? 6) Ask which one will stand on its end. 7) Try to stand both on their end and when it doesn t work, shake both eggs and try again. 8) Ask why shaking affected it and why the hard-boiled egg cannot stand on its end. Explanation: Center of gravity is the point at which gravity will act upon a specific object. In an egg the center lies in the yoke because that is the area of the highest concentration of mass. The hard-boiled egg will spin much faster as a result of the center of gravity remaining stationary. Similarly, the same egg will not stand on its end because the center of gravity cannot be changed by shaking.

4 As a result it can only balance on its side. In the case of the raw egg it did not spin as fast as a result of a shifting center of gravity. The center moved back and forth between the ends of the egg so there was no set point to rotate around. That mobile center of gravity is also the reason that it will stand on its end. After shaking the egg you have allowed the center to shift positions within the egg and bring the weight to the bottom so it is able to balance.

5 Discrepant Event: Egg-in-the-bottle Demo Objective: TLW observe a demonstration and discover the concept of air pressure systems through the development of hypotheses and discussion based upon their observations. Materials: Small saucepan Water Two eggs Glass bottle with /2 round neck Matches Strip of paper Advance Preparation: 1. Place the eggs gently into the pan. Fill the pan with water until they are covered about half an inch. 2. Put the pan on the burner, and turn to medium heat. Bring water to a boil, and then remove pan from burner. 3. Wait about 20 minutes or until water becomes room temperature. 4. Refrigerate eggs until they are needed for the demonstration.

6 Note: To be sure egg is hard-boiled, set the egg on the counter and spin it. If it spins easily without wobbling, it is hard-boiled. Procedure: 1. Break the shell by gently rolling it between the palms of your hands. Remove the shell. 2. Ask the class, What will happen if I place a piece of burning paper into the bottle and then cover the opening with a shelled, hard-boiled egg? 3. After asking the students to suggest possible outcomes, encourage them to explain their reasoning. 4. Lower the strip of paper into the bottle. Use the matches to light the end of the strip with a match. 5. Cover the neck of the bottle with the shelled, hard-boiled egg (pointy end down). 6. Observe the egg drop into the bottle. Explanation: Prior to lighting the strip of paper, the air pressure inside the bottle will be the same as the air pressure outside of the bottle. When the air inside is heated, the air expands and exits the bottle. In other words, the air pressure inside the bottle will decrease when it is heated. When the egg is placed over the opening, the air inside and the air outside are separated. Because the air pressure inside is less than the air pressure outside, the egg is actually pushed in by the air outside the bottle.

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