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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.
AN INTRODUCTION TO CHEMICAL EQUILIBRIA. This page looks at the basic ideas underpinning the idea of a chemical equilibrium. It talks about reversible reactions and how they behave if the system is closed. This leads to the idea of a dynamic equilibrium, and what the common term position of equilibrium means. Reversible reactions.