1. Day 1 thermo

2. Warm Up 8.1: Determine if the following is chemical or physical 1.Boiling water 2.Rusting 3.Evaporation 4.Decomposing 5.Baking 6.Freezing

3. Warm Up 8.1: Determine if the following is chemical or physical- answers 1.Boiling water-physical 2.Rusting- chemical 3.Evaporation -physical 4.Decomposing - chemical 5.Baking- chemical 6.Freezing -physical

4. Questions:Groups AnswersCorrect Answers 1. What is heat? 2. Is heat the same thing as energy? 3. Explain the transformation between energy and heat? 4. What is temperature? 5. How can you detect heat? 6. Can heat be detected by instruments or senses? Explain. 7. Is heat always absorbed? 8. Can heat be given off? Provide an example. 9. What is a Calorie? (like in: “100 Calories in one serving”) 10. Are Calories good or bad for you? Justify.

5. Questions:Correct Answers 1. What is heat?Change in temperature 2. Is heat the same thing as energy?No. 3. Explain the transformation between energy and heat? Energy is the ability to do work or to transfer heat. 4. What is temperature?Movement of particles 5. How can you detect heat?Through a temperature difference 6. Can heat be detected by instruments or senses? Explain. Yes, but only when there is a temperature difference 7. Is heat always absorbed?No. 8. Can heat be given off? Provide an example. Yes. Fire gives off heat. 9. What is a Calorie? (like in: “100 Calories in one serving”) Unit of Energy

6. 10. Are Calories good or bad for you? Justify. They are neither. Consume too much energy (food) that body does not have time to use will be turned into fat to be used as energy in the future. However, if you always consume too much energy, one will gain weight.

7. Heat vs Temp VideoHeat vs Temp Video (4: 51 min)

8. Next, fill in the note sheet

9. Endothermic versus Exothermic

10. EndothermicExothermic Sign Descriptive Words “ In to”, absorb, heat added; heat needed Given off; heat produced; ex it Drawing system heat surroundings

11. Endothermic versus Exothermic Example WS ScenarioEndo or Exo? Explain 1Your car burns gasoline as you drive from home to school 2Jerry is baking homemade bread in the oven. 3The ice melts in your glass of water. 4Sodium and chlorine combine in an explosive reaction to form table salt. 5Barry Balloon lights his candles to get his hot air balloon to fly. 6.Water freezes on the pavement and the roads become icy.

12. Endothermic versus Exothermic Example WS ScenarioEndo or Exo? Explain 1Your car burns gasoline as you drive from home to school Exothermic – “burning “ releases energy 2Jerry is baking homemade bread in the oven. Endothermic – “baking” absorbs energy 3The ice melts in your glass of water.Endothermic – “melting” absorbs energy 4Sodium and chlorine combine in an explosive reaction to form table salt. Exothermic – “explosive” shows releasing energy 5Barry Balloon lights his candles to get his hot air balloon to fly. Exothermic – “lighting” candles releases energy 6.Water freezes on the pavement and the roads become icy. Exothermic – “freezing” releases energy

13. Endothermic versus Exothermic Example WS ScenarioEndo or Exo? Explain 7.Mom puts a pot of water on the stove and the water begins to boil 8.Water condenses on the side of your glass of cold lemonade. 9.A glass of water left out overnight evaporates. 10.A plant carries out photosynthesis. 11.A tree grows. 12.Sally gets really sweaty as she runs. Then she stops running and the sweat evaporates. (Hint: A 2-part question)

14. Endothermic versus Exothermic Example WS ScenarioEndo or Exo? Explain 7.Mom puts a pot of water on the stove and the water begins to boil Endothermic – “boiling” absorbs energy 8.Water condenses on the side of your glass of cold lemonade. Exothermic - “condensation” releases energy 9.A glass of water left out overnight evaporates. Endothermic – “evaporation” absorbs energy 10.A plant carries out photosynthesis.Endothermic- “photosynthesis” absorbs energy 11.A tree grows.Endothermic – “growing” absorbs energy 12.Sally gets really sweaty as she runs. Then she stops running and the sweat evaporates. (Hint: A 2-part question) Endothermic – “evaporation” absorbs energy

15. Endothermic versus Exothermic Example WS ScenarioEndo or Exo? Explain 13The snow melted when we finally had a warm day last week!. 14Corey Chemistry adds hydrochloric acid slowly to water and notices that the flask feels hot. 15The trainer shakes a cold pack to put it on an injured student’s knee. 16An egg is cooked in a frying pan. 17Perry fills his pipet with a mixture of hydrogen and oxygen gas to prepare for the micro-rocket launch. When he squeezes the gas mixture over the Bunsen burner, there is a loud pop.

16. Endothermic versus Exothermic Example WS ScenarioEndo or Exo? Explain 13The snow melted when we finally had a warm day last week!. Endothermic – “melting” absorbs energy 14Corey Chemistry adds hydrochloric acid slowly to water and notices that the flask feels hot. Exothermic – the flask feeling hot shows a release of energy 15The trainer shakes a cold pack to put it on an injured student’s knee. Endothermic – the cold pack absorbs energy 16An egg is cooked in a frying pan.Endothermic – “cooking” absorbs energy 17Perry fills his pipet with a mixture of hydrogen and oxygen gas to prepare for the micro-rocket launch. When he squeezes the gas mixture over the Bunsen burner, there is a loud pop. Exothermic – the “loud pop” shows that there was a release of energy

17. ScenarioEndo or Exo? Explain 18A frozen pond in the winter provides a place for the ice hockey team to practice. 19.Wood burns in the fireplace on a cold winter night.

18. ScenarioEndo or Exo? Explain 18A frozen pond in the winter provides a place for the ice hockey team to practice. Exothermic - “freezing” releases energy 19.Wood burns in the fireplace on a cold winter night. Exothermic - “burning” releases energy

19. “ Endothermic Physical Changes “Fusion” Melting (s  l)  H fus “ Vaporization” ( l  g)  H vap Chemical Reaction Placement A + B + heat  C or A + B  C  H= + kJ Examples Melting Evaporate Boiling Tanning Baking Cooking

20. “ Exothermic Physical Changes ”Solidification” Freezing (l  s)  H solid “Condensation” (g  l)  H cond Chemical Reaction Placement A + B  C + heat or A + B  C  H= - kJ Examples Sweating Burning Exploding Freezing

22. E a : activation energy: energy needed to start a reaction, to start the collisions between reactants- book clipbook clip Activated Complex: “top of the hill” reactants’ atoms start rearranging due to collisions.  H: Enthalpy: change in heat: products – reactants

23. Collision TheoryCollision Theory ( 1:17 min)

24. Diagram 1 has Ineffective collisions of molecules b/c there is no rearrangement of atoms = no reaction. Diagram 2 has an effective collision thus rearrangement of atoms.

25. Endothermic versus Exothermic ( 2:29)

26. “ EndothermicExothermic Rxn Path diagram

27. “ EndothermicExothermic Rxn Path diagram

28. Homework Homework TonightsTonights