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Do Now Wednesday, January 8, 2014

Do Now Wednesday, January 8, 2014. Write a definition for the following words: heat temperature. 3.5 minutes. Do Now Check. By the end of the day today, IWBAT… define and differentiate between heat, temperature, and thermal energy.

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Do Now Wednesday, January 8, 2014

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  1. Do Now Wednesday, January 8, 2014 • Write a definition for the following words: • heat • temperature 3.5 minutes Do Now Check

  2. By the end of the day today, IWBAT… • define and differentiate between heat, temperature, and thermal energy Why it matters in LIFE: Heat and temperature impact our lives every single day – from what we decide to wear to how much our energy bill will be each month. Why it matters in THIS CLASS: Don’t forget about your goal to succeed!

  3. Agenda

  4. Wednesday, 01/08/14

  5. Unit 8: Thermodynamics You will receive trackers and cover sheets to accompany your C-Notes and Lab Assignments for this unit.

  6. THERMODYNAMICS is the study of changes in heat and energy This unit will build on the ideas of energy that we learned in unit 7

  7. A Chemistry Review… • All matter is made up of millions of tiny particles • These tiny particles are constantly in motion PHYSICS CONNECTION: When something is in motion, what type of energy does it have?

  8. Demo: Water and Food Coloring • What did you notice? • What can you say about higher temperature and spread of the dye? • What do you think temperature is really measuring? • What type of energy is motion related to? • Why does the same object feel “hotter” when its temperature is higher? • How would you define temperature?

  9. What is temperature? • Temperature: A measurement of the average kinetic energy possessed by the particles of an object • Thermometers read temperature • If velocity increases, KE will increase, so temperature increases (and vice versa)

  10. What is temperature? • Faster molecules = more kinetic energy = higher temperature • Slower molecules = less kinetic energy = lower temperature

  11. Temperature • Measured in: • Celsius: what the rest of the world uses • Kelvin: what asdfusesdfg Celsius: what the rest of the world uses Fahrenheit: what America uses Kelvin: what Scientists use

  12. Temperature • TC : Celsius • TF : Fahrenheit • TK : Kelvin Conversions: TC = 0.56TF – 32 TF= 1.8 TC + 32 TK = TC + 273

  13. What is thermal energy? • Thermal energy: mechanical energy of the particles in an object • Measured in Joules

  14. What is heat? • Heat: the transfer of energy from areas of high kinetic energy (fast-moving particles) to areas of low kinetic energy (slower-moving particles)

  15. Demo • Place one hand in the beaker of cold water and one hand in the beaker of warm water. Hold them there for 30 seconds. • Place both hands in the tub of room temperature water. Hold them there for 30 seconds. • What do you observe about the hand that was in the hot water after it enters the room temperature water?  • What do you observe about the hand in the cold water after it enters the room temperature water? • Describe what you think is occurring in each hand in regard to the transfer of heat energy.

  16. Temperature ≠ Thermal Energy ≠ Heat • Heat: • The PROCESS of transferring thermal energy from where it is high to where it is low • Thermal Energy: • The total mechanical energy of the PARTICLES of an object • Temperature: • A measurement of how FAST the molecules are moving (AKA the kinetic energy of the molecules)

  17. Quick Checks • What is matter made up of? • What are these particles always doing? • What type of energy do these particles have? • What is temperature? • What unit of temperature does most of the world use? • What unit of temperature do we use in America? • What unit of temperature do scientists use?

  18. Quick Checks • What is thermal energy? • What is mechanical energy? • How is thermal energy different from the mechanical energy we learned about last unit? • What is heat? • How is heat different from thermal energy? • How is heat different from temperature? • How is thermal energy different from temperature?

  19. Which way will heat transfer?

  20. Quick Writes Answer the following questions in COMPLETE SENTENCES on the back of your C-notes. Each answer should be a minimum of 2 sentences

  21. Question #1 • Explain the difference between heat, temperature, and thermal energy.

  22. Question #2 • What happens to the molecules in your hand when you put it in hot water? Molecules of water?

  23. Question #3 • What happens to the molecules in your hand when you put it in cold water? Molecules of water?

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