Chemical reaction
Chemical Reaction
A Chemical Reaction (pronunciation: /ˈkɛmɪkəl riˈækʃən/) is a process that leads to the transformation of one set of chemical substances to another.
Etymology
The term "Chemical Reaction" is derived from the words "chemical" and "reaction". "Chemical" comes from the Greek word "χημεία" (khēmeía) meaning "alchemy", and "reaction" is derived from the Latin word "reactio" meaning "a response".
Definition
Chemical reactions encompass changes that strictly involve the motion of electrons in the forming and breaking of chemical bonds. The substance (or substances) initially involved in a chemical reaction are called reactants or reagents. Chemical reactions are usually characterized by a chemical change, and they yield one or more products, which usually have properties different from the reactants.
Types of Chemical Reactions
Chemical reactions can be categorized into different types, including:
- Combination reactions
- Decomposition reactions
- Displacement reactions
- Redox reactions
- Acid-Base reactions
Related Terms
- Chemical Equation: A representation of a chemical reaction.
- Catalyst: A substance that can speed up a chemical reaction.
- Endothermic Reaction: A reaction that absorbs heat.
- Exothermic Reaction: A reaction that releases heat.
External links
- Medical encyclopedia article on Chemical reaction
- Wikipedia's article - Chemical reaction
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