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Physical Changes vs. Chemical Reactions

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by

M Wade

on 23 July 2015

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Transcript of Physical Changes vs. Chemical Reactions

Think: have the substances changed? Is the water still water, and the punch still punch? Could you re-freeze the substances and still have the same thing?
Physical Changes
Think: Is the buttercream frosting still frosting? It would probably be tough to get the food coloring back out again, but does that mean that it's a new substance? (In other words, does reversibility always apply?)
Expected Color Change
NO new substance formed!
Change in size, shape, or state
Remember that not all the signs must be present!
Reversible
Signs of Physical Change
UNexpected Color Change
A new substance is formed!
A Gas is released (bubbling, smoke)
Remember that not all the signs must be present!
Irreversible
Signs of Chemical Reaction
Chemical REACTIONS
Called REACTion instead of Change because 2 substances REACT to each other!
Change in temperature (energy released/absorbed)
Think: Is the egg still the same substance? Could you reverse the process? Was gas released?
Think: Is the paper still paper? Is the mass of all the pieces still the same?
Think: Do you think a new substance has been formed? Why? What evidence did you see that made this a chemical reaction? Were there bubbles? (a sign that gas is being released)
Think: By the time your food finishes digesting, is it the same substance? How many chemical reactions does your food go through inside your digestive system? What evidence is there of the chemical reaction?
Now, let's look at some examples. Think about the evidence you observe.
What evidence did you observe?
What evidence did you observe?
What evidence did you observe?
What evidence did you observe?
What evidence did you observe?
What evidence did you observe?
Think: did you expect that to happen? Does it look like that Gummy Bear will ever be the same? How do you know energy was "released?"
What evidence did you observe?
No matter what type of chemical reaction it is, there will always be a NEW product from the original reactants!
Want to take it to the high school chemistry level??
Think: what is the new substance? Where do you see evidence of the reaction?
What evidence did you observe?
Physical Changes & Chemical Reactions!!
NO new substance formed!
NEW substance formed!
Now, let's look at some examples. Think about what evidence you see as we watch!
Photo Credits:
http://www.flickr.com/photos/stephen_gunby/
http://www.flickr.com/photos/brianauer/
Full transcript