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One type of chemical reaction is combustion. Carbon dioxide is produced when carbon combines with oxygen in the combustion of charcoal, for example. Carbon and oxygen are reactants, or the chemicals that initiate a chemical reaction. The process produces carbon dioxide. However, this change is just physical.
As the constituent molecules' composition remains unchanged: 11.19% hydrogen and 88.81% oxygen by mass. Physical change can be classed as either reversible or irreversible. When we burn coal, a chemical reaction occurs, and new substances such as carbon dioxide and water are formed. Burning coal is considered as a chemical change since it results in the production of new compounds.
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