Chemical reactions
Chemical Reactions
Chemical reactions (pronunciation: /ˈkɛmɪkəl riˈækʃən/) are processes that lead to the transformation of one set of chemical substances to another.
Etymology
The term "chemical reaction" is derived from the words "chemical", which comes from the word "chemia" meaning "alchemy" in Medieval Latin, and "reaction", which originates from the Latin word "reactio" meaning "a response".
Definition
Chemical reactions are characterized by the breaking of chemical bonds in reactants and the formation of new bonds in products. This process involves changes in the chemical structure of substances.
Types of Chemical Reactions
There are several types of chemical reactions, including:
- Combination reactions: Two or more reactants combine to form a single product.
- Decomposition reactions: A single reactant breaks down into two or more products.
- Displacement reactions: An element in a compound is replaced by another element.
- Redox reactions: Involve the transfer of electrons between reactants.
Factors Influencing Chemical Reactions
Several factors can influence the rate and outcome of chemical reactions, such as:
- Temperature: Higher temperatures typically increase the rate of reaction.
- Pressure: Changes in pressure can affect reactions involving gases.
- Catalysts: Substances that increase the rate of reaction without being consumed in the process.
- Concentration: Higher concentrations of reactants typically lead to faster reactions.
Related Terms
- Chemical equation: Represents a chemical reaction with symbols and formulas.
- Reactant: The starting substances in a chemical reaction.
- Product: The substances produced by a chemical reaction.
- Activation energy: The minimum energy required to initiate a chemical reaction.
External links
- Medical encyclopedia article on Chemical reactions
- Wikipedia's article - Chemical reactions
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