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Keywords of camical change.
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Definition
Chemical 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. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions
Three types
Chemists categorize chemical changes into three main classes: inorganic chemical changes, organic chemical changes and biochemical changes.
Rules
There are five rules of thumb that usually determine if a chemical change occurs:
Color change.
Gas is given off.
A new substance forms.
Heat is given off (exothermic)
Heat is required (endothermic)