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With a chemical change, a substance transforms into a different substance. Most chemical changes are irreversible. For example, you cannot unbake a cake or unburn wood. However, there are some chemical changes that are reversible, such as nitrogen dioxide that is chemically changed by heat and then reforms when cooled.
Everyday, we experience chemical changes in many things around us. Think of a rotten orange, fried egg, rusted nail and even poop! â all these things involved an object (matter) going through a process that can never be reversed. A chemical process (reaction) caused that kind of change. We say there us a chemical change in a matter when the internal make-up (molecules) of the object changes. Unlike a physical change, chemical changes cannot be reversed. Changes that cannot be reversed are called Non-reversible Change.