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69 Days Until the Final!

69 Days Until the Final!. Catalyst: If you have 2000 g of water and you heat it up from 10 o C to 70 o C, then what is the total heat produced in this process? The specific heat of water is 4.18 J/(g x o C). If 980,000 J of energy are added to 6200 g of water at 291 K, what will the

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69 Days Until the Final!

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  1. 69 Days Until the Final! • Catalyst: • If you have 2000 g of water and you heat it up from 10 oC to 70 oC, then what is the total heat produced in this process? The specific heat of water is 4.18 J/(g x oC). • If 980,000 J of energy are added to 6200 g of water at 291 K, what will the final temperature of the water be? The specific heat of water is 4.18 J/(g x oC) End

  2. Would you Rather…

  3. Justify – TPS • Why did you choose the choice that you did? Why do you think it would be better to be burned by one then the other?

  4. Today’s Learning Target • 7.7 – I can use the latent heat of phase change to calculate the amount of energy that is released or absorbed during a change of phase.

  5. ΔHfusion and ΔHvaporization • There is a large amount of energy that is required to change a solid into a liquid and a liquid into a gas (and vice versa) • ΔHfusion = Energy to change solid to a liquid. • ΔHvaporization = Energy to change liquid to a gas. • ΔHfreezing = Energy to change liquid to a solid • ΔHcondensation = Energy to change gas to a liquid

  6. Latent Heat • We can calculate the amount of energy that is necessary to convert a substance from one phase to another • Latent Heat – The energy absorbed as a substance changes phases

  7. ΔH of vaporization/condensation Latent Heats ΔH of fusion/freezing

  8. Equation for Latent Heat • m = mass of compound • ΔH = Enthalpy values for phase changes (constants)

  9. Class Example • You have a 2000 kg of ethanol. Calculate the energy you would need to turn solid aluminum into liquid. The ΔHfusion is 109 kJ/kg.

  10. Table Talk • You have 6342 kg of mercury. How much energy would be required to take mercury from liquid to a gas? The ΔHvaporization is 294 kJ/kg

  11. Stop and Jot • You have an ice cube of H2O that weighs 2000 kg and you melt it to liquid. How much energy does that require? The ΔHfusion is 334 kJ/kg.

  12. Summarize

  13. Connect 4

  14. Work Time • Begin working on your “Homework 7.3” • There will be an exit slip after this activity

  15. Learning Log Assessment Rate yourself 1 – 4 on LTs 7.7

  16. Exit Slip 1. You have 2000 g of water that is heated from 25 C to 100 C. What is the heat absorbed by this process. The specific heat of water is 4.184 J/(gxC)

  17. Learning Log Assessment Using your exit slip score, re-rate yourself on LTs 7.7

  18. Closing Time • Test Tuesday!

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