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.
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Chemical Reaction Basics
- 1. Chemical Reactions The story
- 2. Hi there. This is H 2 O. So is this. Meet 2H 2 O
- 3. They weren’t always so happy.
- 4. Hmph. You’re out of control Bbbllgghh!!
- 5. You need me. I’m important. Meet O 2
- 6. He’s light. He’s fast. He’s crazy! Meet H 2 B-b-b-b-b
- 7. One day… Hey! Quit it!
- 8. One day…
- 9. Chemical Reactions Bonds are broken and new bonds are formed. Bonds in H 2 & O 2 break.
- 10. Chemical Reactions Bonds are broken and new bonds are formed. New bonds form.
- 11. Chemical Reactions New substances are formed. 2 gases react Water is formed
- 12. Parts of a Reaction Reactants: The chemicals you have before the reaction H 2 That’d be us. Tbtbbhth! Tbtbbhth! H 2 O 2
- 13. Parts of a Reaction Products: The substances created in the reaction H 2 O H 2 O
- 14. Chemical Equation Reactants Products Parts of a Reaction
- 15. Chemical Reactions During chemical reactions atoms are not created or destroyed. They’re just rearranged. 2 oxygen atoms 4 hydrogen atoms 2 oxygen atoms 4 hydrogen atoms
- 16. How can you tell if a chemical reaction has happened? Let me give you some hints.
- 17. Is it a chemical reaction? If a gas is produced it might be a chemical reaction. Look for the bubbles!
- 18. Is it a chemical reaction? If it changes color it might be a chemical reaction. Like iron rusting!
- 19. Is it a chemical reaction? If it gets hotter it might be a chemical reaction.
- 20. Is it a chemical reaction? Or…if it gets colder it might be a chemical reaction.
- 21. Exothermic Reactions Exothermic reactions release energy. These reactions feel hot.
- 22. Endothermic Reactions Endothermic reactions absorb energy. These reactions feel cold.
- 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/