Chemical Reaction Basics

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An attempt to make the description of chemical reactions a mini-story. Not the best story by any means, but it was pretty well received by the students.

Published in: Technology, Business, Education

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Chemical Reaction Basics

  1. 1. Chemical Reactions The story
  2. 2. Meet 2H2O Hi there. So is this. This is H2O.
  3. 3. They weren’t always so happy.
  4. 4. Hmph. You’re out of control Bbbllgghh!!
  5. 5. Meet O2 You need me. I’m important.
  6. 6. Meet H2 He’s light. B-b-b-b-b He’s fast. He’s crazy!
  7. 7. One day… Hey! Quit it!
  8. 8. One day…
  9. 9. Chemical Reactions Bonds are broken and new bonds are formed. Bonds in H2 & O2 break.
  10. 10. Chemical Reactions Bonds are broken and new bonds are formed. New bonds form.
  11. 11. Chemical Reactions New substances are formed. 2 gases react Water is formed
  12. 12. Parts of a Reaction Reactants: The chemicals you have before the reaction That’d be us. Tbtbbhth! Tbtbbhth! H2 H2 O2
  13. 13. Parts of a Reaction Products: The substances created in the reaction H2O H2O
  14. 14. Parts of a Reaction Chemical Equation Reactants Products
  15. 15. Chemical Reactions During chemical reactions atoms are not created or destroyed. They’re just rearranged. 2 oxygen atoms 2 oxygen atoms 4 hydrogen atoms 4 hydrogen atoms
  16. 16. How can you tell if a chemical reaction has happened? Let me give you some hints.
  17. 17. Is it a chemical reaction? If a gas is produced it might be a chemical reaction. Look for the bubbles!
  18. 18. Is it a chemical reaction? If it changes color it might be a chemical reaction. Like iron rusting!
  19. 19. Is it a chemical reaction? If it gets hotter it might be a chemical reaction.
  20. 20. Is it a chemical reaction? Or…if it gets colder it might be a chemical reaction.
  21. 21. Exothermic Reactions Exothermic reactions release energy. These reactions feel hot.
  22. 22. Endothermic Reactions Endothermic reactions absorb energy. These reactions feel cold.
  23. 23. Image Sources Water Molecule http://commons.wikimedia.org/wiki/File:Water-3D-vdW.png Oxygen and Hydrogen Molecules http://en.wikipedia.org/wiki/File:Nitrogen-3D-vdW.png POW! http://www.scribbleonwalls.com/images/products/comc_05.jpg Shiny Can http://www.flickr.com/photos/99347433@N00/315475438/ Rusty Can http://www.flickr.com/photos/25149679@N00/466492041/ Burning Match http://www.flickr.com/photos/8070463@N03/3069201840/ Icicles http://www.flickr.com/photos/14316700@N08/3075538662/ Bonfire http://www.flickr.com/photos/dominicspics/1902322480/ Icy branches http://www.flickr.com/photos/laszlo-photo/426155665/

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