Definition of reduction in chemical reactions.
Check the final answer first, then review the worked steps.
Problem
Definition of reduction in chemical reactions.
Answer
Reduction is the gain of electrons by a chemical species, resulting in a decrease in its oxidation state.
Step-by-step solution
- Define Reduction: Reduction is a fundamental concept in chemistry, particularly in redox (reduction-oxidation) reactions. It can be defined in several ways, all of which are interconnected.
- Gain of Electrons: The most common and fundamental definition of reduction is the gain of electrons by a chemical species. When a substance is reduced, it accepts electrons from another substance.
- Decrease in Oxidation State: Another way to define reduction is by looking at the change in oxidation state. Reduction occurs when the oxidation state of an atom or ion decreases. This decrease in oxidation state is a direct consequence of gaining electrons, as electrons carry a negative charge.
- Loss of Oxygen or Gain of Hydrogen: In some contexts, reduction can also be described as the loss of oxygen atoms or the gain of hydrogen atoms from a molecule. For example, the conversion of metal oxides to metals often involves reduction where oxygen is removed.
- Summary: Therefore, reduction in chemical reactions means a species gains electrons, leading to a decrease in its oxidation state. It is the opposite process of oxidation, which involves the loss of electrons or an increase in oxidation state.