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When a substance undergoes a chemical change, it is changed into a different substance with different properties. Example: Baking a Cake
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PHYSICAL AND CHEMICAL CHANGES
© Copyright 2014 – all rights reserved www.cpalms.com modified by Nicole Fagnan
What is a Physical Change?
A physical change alters the form of a substance, but does not change it to another substance.
Example:
Squeezing the juice from an orange
What is a Chemical Change?
When a substance undergoes a chemical change, it is changed into a different substance with different properties.
Example:
Baking a Cake
5 Signs of a Chemical Change
1. Color Change
2. Precipitate Forms (the solid formed from a solution during a chemical reaction)
5 Signs of a Chemical Change
3. Gas Produced
4. Temperature Change
5 Signs of a Chemical Change
5. Changes in Characteristic Properties (odor, light given off)
Cutting paper?
Physical
Chemical or Physical Change?
Chemical or Physical Change?
Toast burning?
Chemical
Ice melting?
Physical
Chemical or Physical Change?
Rocket fuel burning?
Chemical
Chemical or Physical Change?
Sawing wood?
Physical
Chemical or Physical Change?
Metal rusting?
Chemical
Chemical or Physical Change?
Disappearing puddle?
Physical
Chemical or Physical Change?
Candle burning?
Chemical
Chemical or Physical Change?
Dry ice?
Physical
Chemical or Physical Change?
Credits Presentation (including images except as
cited below) modified from http://www.rocklin.k12.ca.us/staff/wisetta/handouts/Physical%20or%20chemical%20changes.ppt
Image on page 10 from http://en.wikipedia.org/wiki/Delta_IV
Image on page 14 from http://www.clipartbest.com/birthday-candles-pictures
Image on page 15 from http://joelzwilliams.blogspot.com/2012/10/the-missouri-method-of-bedbug-control.html