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3 2 What Is Heat

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  • 1. Launch: 3/2   Grab your binder and immediately take a seat!   Place launch paper and practice questions on your desk.   Yesterday’s Exit Slip Data: 85%   Today’s Objectives: I can define heat and classify a phase change as either endothermic or exothermic.
  • 2. Launch: 3/2   Grab your binder and immediately take a seat!   Place launch paper and practice questions on your desk.   Yesterday’s Exit Slip Data: 87%   Today’s Objectives: I can define heat and classify a phase change as either endothermic or exothermic.
  • 3. Launch: 3/2   Grab your binder and immediately take a seat!   Place launch paper and practice questions on your desk.   Yesterday’s Exit Slip Data: 97%   Today’s Objectives: I can define heat and classify a phase change as either endothermic or exothermic.
  • 4. Launch: 3/2   Grab your binder and immediately take a seat!   Place launch paper and practice questions on your desk.   Yesterday’s Exit Slip Data: 97%   Today’s Objectives: I can define heat and classify a phase change as either endothermic or exothermic.
  • 5. Launch 3/2 1.  Using your notes from yesterday (or from memory), list the four phase changes in the correct places. Gas Gas Liquid Liquid Solid Solid
  • 6. Launch 3/2 2.  The random molecular movement is greatest in a.  ice b.  a liquid c.  evaporation d.  a gas
  • 7. Launch 3/2 3.  Ice is placed on a stove and heated for 10 minutes until it changes into a gas. It is then collected and cooled to become pure liquid water. Which of the following correctly identifies the phase changes in the correct order? a.  evaporation, condensation b.  melting, evaporation, freezing, condensation c.  condensation, melting, evaporation, freezing d.  melting, evaporation, condensation
  • 8. Announcements   Unit #8: Thermodynamics   New unit   Start fresh   Exam next Friday   Short unit = short test   25 MC   No school this Thursday!   College tour essay is due this Friday!
  • 9. March Schedule Today Exam!
  • 10. Opening   Today’s Objective: I can identify the four phase changes that occur between the states of matter.   Standard – CH.7.a, CH.7.b, & CH.7.c Today’s Question: I can define heat and classify a phase change as either endothermic or exothermic. Bill Nye!
  • 11. What is heat? Mr. Heffner 3/2/10
  • 12. What is heat?   Heat is…   the amount of energy that is transferred to a substance Flows from hot to cold. Heat and temperature are different!
  • 13. What is heat? Evaporation takes energy because bonds need be broken. Steam Temperature Evaporation 100°C Water Melting 0°C Ice Melting takes energy because bonds need be broken. Heat
  • 14. What is heat?   Endothermic processes…   absorb heat   endo = into   therm = heat   Examples: melting, evaporation   Exothermic processes…   release heat Both release energy because bonds are formed.   exo = exit   Examples: condensation, freezing
  • 15. Foldable   Define the following terms, then draw a picture on the inside of the flap:   Heat   Temperature   Endothermic   Exothermic   Melting   Evaporation   Condensation   Freezing
  • 16. Practice Questions   Practice question worksheet
  • 17. Closing   Today’s Objective: I can identify the four phase changes that occur between the states of matter.   Standard – CH.7.a & CH.7.c Today’s Question: What is a phase change? Bill Nye!
  • 18. Exit Slip 1.  What is heat? a.  the amount of kinetic energy in a substance b.  the amount of movement in a substance c.  how hot a substance feels d.  the amount of energy transferred from one substance to another.
  • 19. Exit Slip 2.  Endothermic processes a.  release energy. b.  occur when energy is transferred from a cold substance to a hot substance. c.  absorb energy. d.  occur when chemical bonds are formed.
  • 20. Exit Slip 3.  Which of the following is an example of an exothermic process? a.  evaporation b.  a liquid turning into a gas c.  melting d.  freezing
  • 21. Exit Slip 4.  A gas is changed into a liquid. What type of process would occur? a.  exothermic b.  endothermic c.  homogenous d.  both a & b
  • 22. Exit Slip 5.  A solid is changed into a liquid. Afterwards, it is cooled and changed back into a solid. Which processes does the sample undergo? a.  2 exothermic processes b.  2 endothermic processes c.  an exothermic process, then an endothermic process d.  an endothermic process, then an exothermic process
  • 23. Homework   Finish practice questions

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