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# Heat Activities OP - PowerPoint PPT Presentation

Heat Activities OP . Created for OP Physics By Dick Heckathorn 16 February 2K+4. WHY DO PLASTIC AND METAL FEEL DIFFERENT?. 3D2 page 68. WHY DO PLASTIC AND METAL FEEL DIFFERENT?. Materials: 2 Styrofoam cups small copper beads small plastic beads thermometer.

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### Heat Activities OP

Created for OP Physics

By

Dick Heckathorn

16 February 2K+4

### WHY DO PLASTIC AND METAL FEEL DIFFERENT?

3D2 page 68

• Materials:

• 2 Styrofoam cups

• thermometer

• 1 . Fill one cup about halt full of small copper beads and the other with the same amount of plastic beads.

• Put your finger in each of the cups.

• Which material feels warmer to the touch?

• Have your partner feel each material also.

• Do you agree about which material felt warmer?

• 4. Using a thermometer, MEASURE and RECORD the temperature of the copper and plastic beads.

• Temperature of Copper = ___ Temperature of Plastic = ___

• 6. If you were to put the copper and the plastic in the refrigerator, what would you PREDICT about the way they would feel if you were to do the same experiment again?

• Why do you predict this?

• 7. Obtain some plastic beads and some copper beads that have been in a cool place. Which material feels colder to your fingers?

• 8. MEASURE and RECORD the temperature of the beads.

• Temperature of Copper = ___

• Temperature of Plastic = ___

• 9. Would you expect a good conductor to feel warmer or colder if you were to touch it after it had been outside all during a winter night?

• 10. Do you think that your clothing is a good conductor or a poor conductor?

• EXPLAIN why.

• 11. Would you expect carpet or tile flooring to feel colder when you step on it in the morning?

• EXPLAIN why.

• 12. When you go home today, compare as many objects as you can that are the same temperature.

• Which objects felt warmest?

• Which objects felt coldest?

• How will you know that these objects were at the same temperature?

### WHAT HAPPENS TO TEMPERATURE WHEN WATER CHANGES STATE?

1C2 page 15

• Materials:

• hot plate

• beaker

• crushed ice

• thermometer

• stirring rod

• graph paper

• 1. Fill the beaker half full of crushed ice. MEASURE and RECORD the temperature of the ice.

• 2a. Place the beaker on the hot plate and begin warming the ice. MEASURE and RECORD the temperature at 1‑minute intervals.

• 2b. Keep the thermometer tip off of the bottom of the beaker. Stir continuously as measurements are made.

• 2c. Continue to take measurements until you have RECORDED at least 3 measurements after the water is boiling.

Min

oC

Min

oC

Min

oC

• 4. Did the temperature rise evenly during the total time of heating? EXPLAIN.

### TEMPERATURE AND SOME EFFECTS OF HEAT

2A3F page 25

• 1. What is the composition of matter?

• Did you say atoms and molecules?

• 2. In solids, what do the atoms or molecules do?

• In a liquid?

• In a gas?

• 3. How do we measure how fast the motion of the atoms or molecules?

• Did you say temperature?

• 4. Thus, how do we change the temperature of a substance?

• 5. Last time we heated a ball that would go through a ring.

• What happened when we heated the ball?

• It expanded and did not go through the ring.

• 6. How does one explain the metal ball expanding and not through the ring?

• The particles vibrated faster and in so doing occupied more space.

• 7. Last time we saw foam balls in a wire cage.

• What happened when a fan was aimed to hit the balls?

• The faster the fan was turning, the further the balls spread out.

• 8. This is exactly what happens when the particles in the metal ball was heated.

• 9. What was considered a possible cause for the electrical outage last summer?

• Sagging electrical wires due to….

• 10. What happened to the size of the foam balls as they moved faster?

• The size did not change.

• 11. The model we have just described is called the “Kinetic” model.

• “Kinetic” refers to things that are in motion.

• 12 This model explains why ‘almost’ all solids, liquids and gasses expand when heated and contract when cooled.

### HOW CAN A THERMOMETER BE CALIBRATED?

2D2 page 36

• Materials:

• unmarked thermometer

• crayon or wax marker

• index card

• water‑resistant tape

• boiling water

• ice water mixture

• 1 . Design a method by which you could mark off your thermometer into units which could be used to measure the temperature of common objects.

• a. Place your thermometer in a container that contains ice water.

• b. Mark the location of the red liquid on your thermometer.

• c. Place your thermometer in a container of boiling water.

• d. Mark the location of the red liquid on your thermometer.

• 3. To test your calibration:

• a. Place your thermometer in a third container – with water.

• b. Write down the temperature of the water according to your thermometer.

• c. Measure the temperature of this water using a calibrated thermometer.

• d. How do the two readings compare?

• e. How well did you calibrate your thermometer?

• f. How well did the temperature of the water compare to others that measured the same water?

### HOW MUCH HEAT ENERGY DOES IT TAKE TO MELT AN ICE CUBE?

3B4 page 58

• 3. PREDICT what the final temperature would be if you were to mix 1 measure of warm water with 1 measure of ice 0oC.

• a. Measure the volume of some ice and put it in a styrofoam cup.

• b. Measure out an equal volume of warm water. Then record its temperature.

• c. Pour this water into the styrofoam cup with ice.

• d. Mix the water and ice and then measure the temperature of the mixture.

• e. How close were you to your prediction?

• oC

• ___ Predicted temperature

• ___ Temperature of mixture