![]() ![]() Inorganic chemistry describes the reactions of elements and compounds that, in general, do not involve carbon. This is an example of a chemical change because the end products are chemically different from the substances before the chemical reaction.Ĭhemists categorize chemical changes into three main classes: inorganic chemical changes, organic chemical changes and biochemical changes. So much energy is released that the hydrogen gas released spontaneously burns in the air. An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen. When chemical reactions occur, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated. ![]() Understanding chemical changes is a major part of the science of chemistry. Some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. ![]() ( Learn how and when to remove this template message)Ĭhemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.
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