Chemical Reaction Basics
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Transcript of Chemical Reaction Basics
![Page 1: Chemical Reaction Basics](https://reader037.fdocuments.us/reader037/viewer/2022103114/55584b67d8b42a993b8b4787/html5/thumbnails/1.jpg)
Chemical ReactionsThe story
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Hi there.
This is H2O.So is this.
Meet 2H2O
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They weren’t alwaysso happy.
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Hmph.You’re out ofcontrol
Bbbllgghh!!
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You need me.
I’m important.
Meet O2
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He’s light.He’s fast.
He’s crazy!
Meet H2
B-b-b-b-b
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One day…Hey!Quit it!
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One day…
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Chemical Reactions
Bonds are broken and new bonds are formed.
Bonds in H2 & O2 break.
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Chemical Reactions
Bonds are broken and new bonds are formed.
New bonds form.
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Chemical ReactionsNew substancesare formed.
2 gases react Water is formed
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Parts of a ReactionReactants:The chemicals you have before the reaction
H2
That’d be us.
Tbtbbhth! Tbtbbhth!
H2O2
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Parts of a ReactionProducts:The substances created in the reaction
H2O H2O
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Chemical EquationReactant
sProducts
Parts of a Reaction
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Chemical Reactions
During chemical reactions atoms are not created or destroyed. They’re just
rearranged.
2 oxygen atoms4 hydrogen atoms
2 oxygen atoms4 hydrogen atoms
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How can you tellif a chemical reactionhas happened?
Let me give you some hints.
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Is it a chemical reaction?
If a gas is producedit might be a chemical reaction.Look for the bubbles!
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Is it a chemical reaction?
If it changes colorit might be a chemical reaction.Like iron rusting!
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Is it a chemical reaction?
If it gets hotterit might be a chemical reaction.
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Is it a chemical reaction?
Or…if it gets colderit might be a chemical reaction.
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Exothermic ReactionsExothermic reactions release energy.These reactions feel hot.
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Endothermic Reactions
Endothermic reactions absorb energy.These reactions feel cold.
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Image SourcesWater Molecule
http://commons.wikimedia.org/wiki/File:Water-3D-vdW.png
Oxygen and Hydrogen Moleculeshttp://en.wikipedia.org/wiki/File:Nitrogen-3D-vdW.png
POW!http://www.scribbleonwalls.com/images/products/comc_05.jpg
Shiny Canhttp://www.flickr.com/photos/99347433@N00/315475438/
Rusty Canhttp://www.flickr.com/photos/25149679@N00/466492041/
Burning Matchhttp://www.flickr.com/photos/8070463@N03/3069201840/
Icicleshttp://www.flickr.com/photos/14316700@N08/3075538662/
Bonfirehttp://www.flickr.com/photos/dominicspics/1902322480/
Icy brancheshttp://www.flickr.com/photos/laszlo-photo/426155665/