Monday, September 23, 2013

Chemical Reactions

   
     A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.  Chemical reactions can be caused by heat.  They could be instant or they could be slow.  Examples of chemical reactions are:  burning of wood, mixing baking soda with vinegar, rusting of iron, baking a cake and cooking an egg. 

  
Chemical Reactions from Heat
   There are many examples of chemical reactions with heat.   Here are some of them:  cooking bacon, cooking a hamburger, cooking chicken, baking a cake, cooking an egg, cooking cookies, and more. Before you cook it, the bacon is pink and soft.  After cooking, it is darker, harder, and crumbly.  This is a chemical reaction because the heat changes it dramatically.  


Instant Chemical Reactions

Other chemical reactions are fast.  Here are some examples:  baking soda and vinegar, burning of wood, fireworks, and yeast with water and sugar.  Regular wood is hard, solid and brown.  After burning it has turned into black ash.



Slow Chemical Reactions
Some chemical reactions are slow.  Here are a few:  the rusting of iron, the rotting of food and rock formation.  Before iron is black and shiny.  After months and years and rain and water it is lighter and rusty.
These are some common types of chemical reactions.  I took a video of a couple chemical reactions.





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