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Because painting a fence is not a chemical reaction, it is on the outside which can make something a physical change. For example, a physical change is like changing the color of your hair, but chemical changes is when a substance is formed or altered in a chemical reaction. Hope this helps a little
painting the fence is physical it has no chemical raction or anything.a example of  A chemical change  is a glowstick when you crack it it glows because two substances are reacting to each other.

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