combination and decomposition ,oxidation, reduction ,redox defination of reaction with examples
Answers
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1. Oxidation-Reduction or Redox Reaction
Redox (short for reduction-oxidation reaction) is a chemical reaction in which the oxidation states of atoms are changed. Any such reaction involves both a reduction process and a complementary oxidation process, two key concepts involved with electron transfer processes.
The chemical species from which the electron is stripped is said to have been oxidized, while the chemical species to which the electron is added is said to have been reduced. It can be explained in simple terms:
Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion.
Reduction is the gain of electrons or a decrease in oxidation state by a molecule, atom, or ion.
The reaction that occurs when In which I2 is reduced to I– and S2O32- (thiosulfate anion) is oxidized to S4O62- provides an example of a redox reaction:
2 S2O32−(aq) + I2(aq) → S4O62−(aq) + 2 I−(aq)
2. Direct Combination or Synthesis Reaction
In a synthesis reaction, two or more chemical species combine to form a more complex product.
A + B → AB
The combination of iron an sulfur to form iron (II) sulfide is an example of a synthesis reaction:
8 Fe + S8 → 8 FeS
3. Chemical Decomposition or Analysis Reaction
In a decomposition reaction, a compound is broken into smaller chemical species.
AB → A + B
The electrolysis of water into oxygen and hydrogen gas is an example of a decomposition reaction:
2 H2O → 2 H2 + O2
4. Oxidation reaction
when an atom or an ion loses electrons it is said to be as oxidation
ex: Na-1e ⇒Na+
5 Reduction reaction
when a atom or an ion gains electrons it is said to be as reduction
ex: cl+e⇒cl-
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