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Physical Versus Chemical Change

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by

Teika Clavell

on 6 September 2013

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Transcript of Physical Versus Chemical Change

photo (cc) Malte Sörensen @ flickr
The signs and differences
Physical vs Chemical Change
a change that occurs that does not change the identity of the substance
Physical Change
a change that occurs that changes the identity of a substance
Chemical Change

Change in appearance (state of matter i.e., solid, liquid, gas) but the substance itself (it's identity does not)
Change in texture
Evidence of a Physical Change
Law of Conservation of Mass
Matter is neither created nor destroyed during a chemical change
Chemical equations and formulas give a description of chemical reactions in numerical form using subscripts and coefficients.
Chemical Equations/ formulas
Coefficients represent the number of atoms in the entire molecule after the number.
A chemical reaction is process where elements and compounds combine to form new substances.

Endothermic Reaction- Chemical reaction that needs or absorbs heat.

Exothermic Reaction- Chemical reaction that creates heat.
Evidence of a Chemical Reaction
Precipitate-a solid that forms during a chemical reaction

Catalyst- a substance that causes or accelerates a chemical reaction
Five signs of chemical change
1. odor
2. gases formed
3. temperature change
4. color change
5. precipitate
Full transcript