Day 1 thermo

Day 1 thermoWarm Up 8.1: Determine if the following is chemical or physicalBoiling waterRustingEvaporation Decomposing BakingFreezing Warm Up 8.1: Determine if the following is chemical or physical- answersBoiling water-physicalRusting- chemicalEvaporation -physicalDecomposing - chemicalBaking- chemicalFreezing -physical

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. 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 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. Heat vs Temp Video (4: 51 min)Next, fill in the note sheet

Endothermic versus ExothermicEndothermicExothermicSign Descriptive Words Into, absorb, heat added; heat neededGiven off; heat produced; exit DrawingsystemsystemheatheatsurroundingssurroundingsEndothermic 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.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 energyEndothermic 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)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 energyEndothermic 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 students 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.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 students 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 energyScenarioEndo 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.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 energyEndothermicPhysical Changes Fusion Melting (sl) Hfus Vaporization ( l g)HvapChemical Reaction PlacementA + B + heat CorA + B C H= + kJExamplesMelting EvaporateBoiling TanningBakingCooking ExothermicPhysical ChangesSolidification Freezing(l s) HsolidCondensation (g l) Hcond

Chemical Reaction PlacementA + B C + heatorA + B C H= - kJExamplesSweatingBurning ExplodingFreezing

Ea: activation energy: energy needed to start a reaction, to start the collisions between reactants- book clip

Activated Complex: top of the hill reactants atoms start rearranging due to collisions.

H: Enthalpy: change in heat: products reactants

Collision Theory ( 1:17 min)

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. Endothermic versus Exothermic ( 2:29)

EndothermicExothermicRxn Path diagram

EndothermicExothermicRxn Path diagram

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