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Energy in Chemical Reactions

Energy in Chemical Reactions. 9/18/2014. 2.5. Days until Kelly Clarkson’s birthday, April 24, 2011. 181. Today's Warm-up. Chemical reactions and the energy produced by them are used in a variety of different ways… Hot Hands Glow sticks Ice Paks Heat Paks. Today’s Warm-Up.

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Energy in Chemical Reactions

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  1. Energy in Chemical Reactions 9/18/2014 2.5

  2. Days until Kelly Clarkson’s birthday,April 24, 2011 181

  3. Today's Warm-up • Chemical reactions and the energy produced by them are used in a variety of different ways… • Hot Hands • Glow sticks • Ice Paks • Heat Paks

  4. Today’s Warm-Up How do you “carve” a jack-o-lantern in seconds? With explosives of course! http://beam.to/pumpkins http://www.jack-o-lantern.com/ http://www.pumpkinmasters.com/default.asp

  5. Today’s Warm-Up Halloween is on its way!!! I love Halloween, but here are some examples of why dogs probably hate Halloween! Who would do this to a poor dog?!?

  6. Today’s Warm-Up

  7. Today's Objectives • Grade Lab Notebooks • Review types of chemical reactions & review homework sheet • Take Test! • Physical vs chemical reactions • Law of conservation of mass • Balancing chemical equations • 4 types of chemical reactions • Discuss energy in chemical reactions • Endergonic / Endothermic • Exergonic / Exothermic • Chemical energy lab activity- “Baggie Lab” • Text review activity

  8. Lab Notebook Check • You are looking for: • Notebook covered and decorated (if not, it’s an automatic “1”) • Table of contents up-to-date (Law of Conservation of Mass; Types of Chemical Reactions) • Notes neat and up-to-date • At least two “Mustang Science” stamp this grading period • Must have Cornell Notes summaries for a “3” • Remember: 3=WOW! 2=Good 1=Needs work 0=

  9. Types of Chemical Reactions Let’s review our homework sheet together.

  10. After Test • Textbook, Pg. 375-376 • Answer: (You do NOT have to write the questions!) • Concept Review #1, 2, 3 and 4 • Problems #1 • Applying your knowledge #2 • Turn in to bin when complete

  11. Energy in Chemical Reactions List of the 2 types of reactions (related to energy) we discuss today Give an example of each type Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Summary of the notes and information learned

  12. Energy in Chemical Reactions • When chemical reactions take place chemical bonds are broken and reformed. • Breaking chemical bonds requires energy (endergonic). • Forming new chemical bonds releases energy as light, heat, etc. (exergonic).

  13. Energy in Chemical Reactions • Exothermic reactions • In many reactions, less energy is required to break the bonds of the reactants than is released when bonds are formed to make new products • Extra energy is often released as heat

  14. Energy in Chemical Reactions • Exothermic reactions • Combustion reactions (like burning gasoline in your car) are obviously exothermic, but so is digestion of food or formation of rust

  15. Energy in Chemical Reactions • Endothermic reactions • Sometimes more energy is required to break the bonds of the reactants than is released when new bonds are formed • More energy must be provided for the reaction to take place than is released

  16. Energy in Chemical Reactions • Endothermic reactions • You can detect an endothermic reaction by measuring a decrease in temperature

  17. Chemical Reactions- Baggie Lab • We will work in lab groups of two • Note that we are using Phenol Red as our indicator solution • Phenol Red is yellow below pH of 6.6 • Phenol Red is red above pH of 8.0

  18. Energy in Chemical Reactions List of the 2 types of reactions (related to energy) we discuss today Give an example of each type Notes Notes Notes Notes Notes Notes Notes Notes Notes Notes Summary of the notes and information learned

  19. Chemical Reaction Video • Bill Nye- The Science Guy!

  20. Make it a great day Mustangs!

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