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Catalyst

Catalyst. What is entropy? What is the triple point on a phase diagram? What is the critical point on a phase diagram?. End. Learning Log Assessment. Rate yourself 1 – 4 on LTs 7.1-7.6. ?. Lecture 7.4 – Calorimetry and the hot cheetos lab. Today ’ s Learning Target.

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Catalyst

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  1. Catalyst • What is entropy? • What is the triple point on a phase diagram? • What is the critical point on a phase diagram? End

  2. Learning Log Assessment Rate yourself 1 – 4 on LTs 7.1-7.6

  3. ?

  4. Lecture 7.4 – Calorimetry and the hot cheetos lab

  5. Today’s Learning Target • LT 7.6 – Using calorimetry data, I can utilize my knowledge of temperature change and specific heats to calculate the amount of heat transferred for a reaction.

  6. Today’s Focus Question • How do we determine the amount of calories in Flamin’ Hot Cheetos?

  7. How is the energy of food measured?

  8. (Review) I. Specific Heat • The amount of energy that is transferred is dependent on the nature of the material receiving the energy. • Specific Heat (Cp)– The energy required to raise the temperature of one gram of substance one degree Celsius

  9. (Review) II. Calorimetry • Calorimetryis the science of measuring the heat of a chemical reaction. • q represents the heat gained/released • Cp is the specific heat • ΔT = Final Temperature – Initial Temp.

  10. Class Example • A 4.0 g sample of glass is heated from 274 K to 314 K. Glass has a specific heat of 0.20 J/(g x K). How much heat is gained during this heating?

  11. Table Talk • The specific heat of copper is 0.4 J/oC. How much heat is needed to change the temperature of a 30 g sample of copper from 20.0 oC to 60.0 oC?

  12. Stop and Jot • Determine the specific heat of a material if a 35 g sample absorbed 96 J as it was heated from 293 K to 313 K.

  13. SUMMARIZE

  14. Calories in Flamin’ Cheetos • Q can be measured in calories • Food scientists measure the calories contained within food by measuring the amount of energy it takes to raise 1 g of water 1 oC. • 1000 calories = 1 Calorie • 1 serving of Cheetos has 140 Calories

  15. Flamin Hot Cheetos Lab

  16. Lab Work Time

  17. Lab Calculations

  18. Work Time • Continue working on your Hot Cheetos Lab • There will be an exit slip after this activity

  19. Exit Slip 1. I have a sample of water and I increase the temperature from 10.0 oC to 40 oC. The specific heat of water is 4.18 J/(g x oC). Calculate the heat absorbed for this process.

  20. Learning Log Assessment Rate yourself 1 – 4 on LTs 7.1-7.6

  21. Closing Time • Finish Hot Cheetos Lab and Update Wikispaces • Rough Draft of Lab Report Begins

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