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A physical change is when the same compound/chemical just changes form, for example, water experiences physical changes when it goes from ice to a liquid to water vapor (a gas or steam). A chemical change is one where bonds have changed, therefore the molecule that started the change, is now a completely different molecule. For example, burning glucose in oxygen gives you carbon dioxide and water. Notice the glucose has combined with the oxygen to form completely new chemicals, i.e. CO2 and H2O. (It is worth remembering that burning is a chemical reaction with oxygen.)

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