boiling point lab hari- modifications 8th grade science hari- modifications 8th grade science

Download Boiling Point Lab Hari- Modifications 8th grade science Hari- Modifications 8th grade science

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  • Slide 1
  • Boiling Point Lab Hari- Modifications 8th grade science Hari- Modifications 8th grade science
  • Slide 2
  • Introduction/Thinking Questions What is boiling? Is boiling always hot? What happens to a liquid when it boils? What is the boiling point of water (in Celsius)? What do you think will happen to the temperature of boiling water if you continue to heat it for 5 minutes? What is boiling? Is boiling always hot? What happens to a liquid when it boils? What is the boiling point of water (in Celsius)? What do you think will happen to the temperature of boiling water if you continue to heat it for 5 minutes?
  • Slide 3
  • I. Define the Problem: We do not know what will happen to the temperature of solid water as we heat it to water vapor.
  • Slide 4
  • II. Focus Question: What happens to the temperature of ice as we heat it to boiling and continue to boil it?
  • Slide 5
  • III. Prediction: I think that the temperature will _____. I think this because______.
  • Slide 6
  • IV. Share: Most people think the temperature will go up, a few said it will stay the same.
  • Slide 7
  • V. Plan of Action A. Materials: Hot plate, beaker, ice, thermometer, salt, goggles, tongs A. Materials: Hot plate, beaker, ice, thermometer, salt, goggles, tongs
  • Slide 8
  • V. Plan of Action B. Independent Variable: heat or energy, time B. Independent Variable: heat or energy, time
  • Slide 9
  • V. Plan of Action C. Dependent Variable: temperature C. Dependent Variable: temperature
  • Slide 10
  • V. Plan of Action D. Control: Amount of water/ice D. Control: Amount of water/ice
  • Slide 11
  • V. Plan of Action E. Procedure: 1. Put a few milliliters of water in your beaker. Fill it up with ice and stir gently with thermometer. E. Procedure: 1. Put a few milliliters of water in your beaker. Fill it up with ice and stir gently with thermometer.
  • Slide 12
  • V. Plan of Action/ E. Procedure Continued: 2. When the temperature has not changed for 2 minutes (stops falling) record the temperature. You are ready to begin the lab.
  • Slide 13
  • V. Plan of Action/ E. Procedure Continued: 3. Place the beaker on the cold hot plate. Stir the ice continually with the thermometer and record the temperature every 30 seconds. Do not allow the thermometer to touch the bottom of the beaker. Continue heating until the water boils.
  • Slide 14
  • V. Plan of Action/ E. Procedure Continued: 4. Once it boils, heat for an additional 5 min.
  • Slide 15
  • V. Plan of Action/ E. Procedure Continued: 5. Record all information in a chart.
  • Slide 16
  • V. Plan of Action/ E. Procedure Continued: 6. Repeat procedure the next day adding salt to the ice.
  • Slide 17
  • VI. Data Chart A. Leave a blank page for data. Include labeled data charts (i.e. plain water, water with salt, etc...).
  • Slide 18
  • VI. Data Continued B.Data Graph Leave the next page for the graph of the data. Temperature on Y axis vs Time on X axis. B.Data Graph Leave the next page for the graph of the data. Temperature on Y axis vs Time on X axis.
  • Slide 19
  • VII. Drawing:
  • Slide 20
  • VIII. New Vocabulary Boiling Point Phase Change Acclimation Boiling Point Phase Change Acclimation
  • Slide 21
  • IX. Claims and Evidence Make at least 4 claims backed up by evidence from the data and graphs. Example: I claim that _______. I claim this because ________. Make at least 4 claims backed up by evidence from the data and graphs. Example: I claim that _______. I claim this because ________.
  • Slide 22
  • X. Conclusion and Reflection Either copy questions or create a complete sentence answer out of the questions. 1. What type of change did the water undergo when it changed from a solid to a liquid to a gas? Either copy questions or create a complete sentence answer out of the questions. 1. What type of change did the water undergo when it changed from a solid to a liquid to a gas?
  • Slide 23
  • X. Conclusion and Reflection Either copy questions or create a complete sentence answer out of the questions. 2. When water boils, bubbles form at the bottom and rise to the top. What exactly are the bubbles comprised of and why do they appear to form at the bottom of the beaker? Either copy questions or create a complete sentence answer out of the questions. 2. When water boils, bubbles form at the bottom and rise to the top. What exactly are the bubbles comprised of and why do they appear to form at the bottom of the beaker?
  • Slide 24
  • X. Conclusion and Reflection Either copy questions or create a complete sentence answer out of the questions. 3. Why didn t the temperature of the ice water mixture increase rapidly once it was placed on the hot plate? Either copy questions or create a complete sentence answer out of the questions. 3. Why didn t the temperature of the ice water mixture increase rapidly once it was placed on the hot plate?
  • Slide 25
  • X. Conclusion and Reflection Either copy questions or create a complete sentence answer out of the questions. 4. After about 3-5 minutes of heating the temperature began to rise very quickly, why did this occur? Either copy questions or create a complete sentence answer out of the questions. 4. After about 3-5 minutes of heating the temperature began to rise very quickly, why did this occur?
  • Slide 26
  • X. Conclusion and Reflection Either copy questions or create a complete sentence answer out of the questions. 5. Why didn t the temperature continue to rise once it reached the boiling point? Either copy questions or create a complete sentence answer out of the questions. 5. Why didn t the temperature continue to rise once it reached the boiling point?
  • Slide 27
  • X. Conclusion and Reflection Either copy questions or create a complete sentence answer out of the questions. 6. How can water boil below 100o C? Either copy questions or create a complete sentence answer out of the questions. 6. How can water boil below 100o C?
  • Slide 28
  • X. Conclusion and Reflection Either copy questions or create a complete sentence answer out of the questions. 7. Based on your results how does adding salt affect the freezing and boiling points of of water? Either copy questions or create a complete sentence answer out of the questions. 7. Based on your results how does adding salt affect the freezing and boiling points of of water?
  • Slide 29
  • X. Conclusion and Reflection Either copy questions or create a complete sentence answer out of the questions. 8. Calcium Chloride (salt) is used in the winter to melt ice on roads and sidewalks. When salt is added to ice it makes the temperature of the ice colder. How can ice melt if the temperature actually becomes colder? Either copy questions or create a complete sentence answer out of the questions. 8. Calcium Chloride (salt) is used in the winter to melt ice on roads and sidewalks. When salt is added to ice it makes the temperature of the ice colder. How can ice melt if the temperature actually becomes colder?
  • Slide 30
  • X. Conclusion and Reflection Either copy questions or create a complete sentence answer out of the questions. 9. At the boiling point the heat of vaporization occurs. Based on your observations, what do you think the heat of vaporization is? Either copy questions or create a complete sentence answer out of the questions. 9. At the boiling point the heat of vaporization occurs. Based on your observations, what do you think the heat of vaporization is?
  • Slide 31
  • X. Conclusion and Reflection Either copy questions or create a complete sentence answer out of the questions. 10. Element z has a boiling point of 72o C at standard atmospheric conditions. Yesterday, a lab group measured the boiling point of z to be 65o C. Why did this occur and what happened physically to to z when it reached this temperature? Either copy questions or create a complete sentence answer out of the questions. 10. Element z has a boiling point of 72o C at standard atmospheric conditions. Yesterday, a lab group measured the boiling point of z to be 65o C. Why did this occur and what happened physically to to z when it reached this temperature?
  • Slide 32
  • X. Conclusion and Reflection Either copy questions or create a complete sentence answer out of the questions. 11. Describe what is happening to the molecules of the water as it changes from a solid to a liquid to a gas. Either copy questions or create a complete sentence answer out of the questions. 11. Describe what is happening to the molecules of the water as it changes from a solid to a liquid to a gas.
  • Slide 33
  • X. Conclusion and Reflection Either copy questions or create a complete sentence answer out of the questions. 12. List two characteristics of solids, liquids,and gases that apply only to those phases. Either copy questions or create a complete sentence answer out of the questions. 12. List two characteristics of solids, liquids,and gases that apply only to those phases.
  • Slide 34
  • X. Conclusion and Reflection Either copy questions or create a complete sentence answer out o

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