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lesson plan 3

# lesson plan 3 - heat Mixing Steel Wool generating heat 1...

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February 19 Introduction: Get the students to describe what they have learned about heat and get them to provide predictions for the experiments. Burning: I will light a candle and they can feel the heat from the candle. Then I will do the candle in a jar experiment to have them think further into what is happening in the experiment. Light the candle and discuss some properties of burning. Then cover the candle with a glass jar. When the candle goes out discuss why it did so. Friction: Steps: 1. Put your cold hands together and start rubbing them together slowly. Do they still feel cold? 2. Now start rubbing them together really fast. How do they feel now? Are they warmer? 3. Next, try rubbing your hands up and down your thighs really fast. This will warm both your hands and legs. 4. Try crossing your arms and rubbing your hands up and down the tops of your arms really fast. This will warm both your hands and arms. This is called friction. When you rub things together you create friction and friction is what causes

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Unformatted text preview: heat. Mixing: Steel Wool generating heat 1. Put the thermometer in the jar and close the lid. 2. Wait about 5 minutes and write down the temperature. 3. Remove the thermometer from the jar. 4. Soak a piece of steel wool in vinegar for one minute. 5. Squeeze the vinegar out of the steel wool pad. Wrap the steel wool around the bulb of the thermometer. 6. Place the thermometer and steel wool back into the jar and close the lid. 7. Wait 5 minutes. 8. Now take a look at the temperature. What happened to the temperature? Are you surprised that the temperature rose? The vinegar removes any protective coating from the steel wool, allowing the iron in the steel to rust . Rusting is a slow combination of iron with oxygen. When this happens, heat energy is released. The heat released by the rusting of the iron causes the mercury in the thermometer to expand and rise. Conclusion: Have them tell me what they learned today about heat?...
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