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Physical changes are about energy and states of matter. Chemical changes happen on a molecular level. When you step on a can and crush it, you have forced a physical change. The shape of the object has changed. It wasn't a change in the state of matter, but something changed.
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www.chem4kids.com/files/matter_chemphys.html
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Determine if each is a physical or chemical change. ... Copy this to my account ... Find other activities...
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www.quia.com/quiz/303980.html
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Chemical change - Wikipedia, the free encyclopedia
In a chemical change, bonds are broken and new bonds are formed between different atoms. This breaking and forming of bonds takes place when particles of the original materials collide with one anothe...
en.wikipedia.org/wiki/Chemical_change
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Chemical changes are changes substances undergo when they become new or different substances. For example, the fireworks we see on the 4th of July are actually metals such as magnesium and copper that change chemically as they light up the night skies with their fantastic colors.
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www.usoe.k12.ut.us/curr/science/sciber00/8th/matter/sci...
www.usoe.k12.ut.us/curr/science/sciber00/8th/matter/sciber/chemchng.htm
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Chemical and Physical Changes | Classifying Matter and Changes in Matter | Understanding Chemical and Physical Changes | Experiments | Explanations | Directory of Related Links;
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mypage.direct.ca/k/kasmith/gina/index.html
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What is the difference between a physical change and a chemical change? Asked by: Tim Meyer; Answer; There are two possible definitions for Physical and Chemical changes which I use in school: 1. A physical change is reversible, a chemical change is not.
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www.physlink.com/Education/AskExperts/ae244.cfm
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Find out what chemical and physical changes are, get examples, and learn how to tell them apart. ... Chemical changes take place on the molecular level. A chemical change produces a new substance. Examples of chemical changes include combustion (burning), cooking an egg, rusting of an iron pan, and mixing hydrochloric acid...
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chemistry.about.com/od/lecturenotesl3/a/chemphyschanges...
chemistry.about.com/od/lecturenotesl3/a/chemphyschanges.htm
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A chemical reaction is material changing from a beginning mass to a resulting substance. The hallmark of a chemical reaction is that new material or materials are made, along with the disappearance of the mass that changed to make the new. ...
http://www.chemtutor.com/react.htm
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