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Hi Daisy, a chemical change is where a chemical reaction has occurred and this is usually a one way reaction. For example, the carbon in wood combines with oxygen when burning to produce carbon dioxide. A physical change, however, is where a change can be reversed. An example of this is water being boiled into steam. The steam can cool and condense back into water. It is physically changed but not chemically. Hope this helps, Rob
Asked by Aniqah
How do you distinguish between the different types of isomers?