Boiling water Rusting Evaporation Decomposing Baking Freezing Warm Up 81 Determine if the following is chemical or physical answers Boiling water physical Rusting chemical Evaporation ID: 1047102
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1. Day 1 thermo
2. Warm Up 8.1: Determine if the following is chemical or physicalBoiling waterRustingEvaporation Decomposing BakingFreezing
3. Warm Up 8.1: Determine if the following is chemical or physical- answersBoiling water-physicalRusting- chemicalEvaporation -physicalDecomposing - chemicalBaking- chemicalFreezing -physical
4. Questions: Groups AnswersCorrect Answers1. 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 Answers1. What is heat? Change in temperature2. 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 particles5. 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 difference7. 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 Video (4: 51 min)
8. Next, fill in the note sheet
9. Endothermic versus Exothermic
10. EndothermicExothermicSign Descriptive Words “ Into”, absorb, heat added; heat neededGiven off; heat produced; exit Drawing systemsystemheatheatsurroundingssurroundings
11. Endothermic versus Exothermic Example WSScenarioEndo or Exo? Explain1Your car burns gasoline as you drivefrom home to school2Jerry is baking homemade bread inthe oven.3The ice melts in your glass of water.4Sodium and chlorine combine in anexplosive reaction to form table salt.5Barry Balloon lights his candles to gethis hot air balloon to fly.6.Water freezes on the pavement andthe roads become icy.
12. Endothermic versus Exothermic Example WSScenarioEndo or Exo? Explain1Your car burns gasoline as you drivefrom home to schoolExothermic – “burning “ releases energy2Jerry is baking homemade bread inthe oven.Endothermic – “baking” absorbs energy3The ice melts in your glass of water.Endothermic – “melting” absorbs energy4Sodium and chlorine combine in anexplosive reaction to form table salt.Exothermic – “explosive” showsreleasing energy5Barry Balloon lights his candles to gethis hot air balloon to fly.Exothermic – “lighting” candlesreleases energy6.Water freezes on the pavement andthe roads become icy.Exothermic – “freezing” releases energy
13. Endothermic versus Exothermic Example WSScenarioEndo or Exo? Explain7.Mom puts a pot of water on thestove and the water begins to boil8.Water condenses on the side of yourglass of cold lemonade.9.A glass of water left out overnightevaporates.10.A plant carries out photosynthesis.11.A tree grows.12.Sally gets really sweaty as she runs.Then she stops running and thesweat evaporates.(Hint: A 2-part question)
14. Endothermic versus Exothermic Example WSScenarioEndo or Exo? Explain7.Mom puts a pot of water on thestove and the water begins to boilEndothermic – “boiling” absorbs energy8.Water condenses on the side of yourglass of cold lemonade.Exothermic - “condensation” releases energy9.A glass of water left out overnightevaporates.Endothermic – “evaporation” absorbs energy10.A plant carries out photosynthesis.Endothermic- “photosynthesis” absorbs energy11.A tree grows.Endothermic – “growing” absorbs energy12.Sally gets really sweaty as she runs.Then she stops running and thesweat evaporates.(Hint: A 2-part question)Endothermic – “evaporation” absorbs energy
15. Endothermic versus Exothermic Example WSScenarioEndo or Exo? Explain13The snow melted when we finally hada warm day last week!.14Corey Chemistry adds hydrochloricacid slowly to water and notices thatthe flask feels hot.15The trainer shakes a cold pack toput it on an injured student’s knee.16An egg is cooked in a frying pan.17Perry fills his pipet with a mixture ofhydrogen and oxygen gas to preparefor the micro-rocket launch. Whenhe squeezes the gas mixture over theBunsen burner, there is a loud pop.
16. Endothermic versus Exothermic Example WSScenarioEndo or Exo? Explain13The snow melted when we finally hada warm day last week!.Endothermic – “melting” absorbs energy14Corey Chemistry adds hydrochloricacid slowly to water and notices thatthe flask feels hot.Exothermic – the flask feeling hot shows a release of energy15The trainer shakes a cold pack toput it on an injured student’s knee.Endothermic – the cold pack absorbs energy16An egg is cooked in a frying pan.Endothermic – “cooking” absorbs energy17Perry fills his pipet with a mixture ofhydrogen and oxygen gas to preparefor the micro-rocket launch. Whenhe squeezes the gas mixture over theBunsen burner, there is a loud pop.Exothermic – the “loud pop” shows that there was a release of energy
17. ScenarioEndo or Exo? Explain18A frozen pond in the winter providesa place for the ice hockey team topractice.19.Wood burns in the fireplace on acold winter night.
18. ScenarioEndo or Exo? Explain18A frozen pond in the winter providesa place for the ice hockey team topractice.Exothermic - “freezing” releases energy19.Wood burns in the fireplace on acold winter night.Exothermic - “burning” releases energy
19. “EndothermicPhysical Changes “Fusion” Melting (sl) Hfus “ Vaporization” ( l g)HvapChemical Reaction PlacementA + B + heat CorA + B C H= + kJExamplesMelting EvaporateBoiling TanningBakingCooking
20. “ExothermicPhysical Changes ”Solidification” Freezing(l s) Hsolid“Condensation” (g l) HcondChemical Reaction PlacementA + B C + heatorA + B C H= - kJExamplesSweatingBurning ExplodingFreezing
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22. Ea: activation energy: energy needed to start a reaction, to start the collisions between reactants- book clipActivated Complex: “top of the hill” reactants’ atoms start rearranging due to collisions. H: Enthalpy: change in heat: products – reactants
23. Collision 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. “EndothermicExothermicRxn Path diagram
27. “EndothermicExothermicRxn Path diagram
28. Homework Tonights