Identifying Exchange Reactions- Which of the Following Chemical Processes Qualifies as an Exchange Reaction-
Which of the following is an exchange reaction?
In the world of chemistry, reactions can be categorized into various types based on the nature of the transformation that occurs. One such type is an exchange reaction, which involves the swapping of atoms or ions between reactants. This article aims to explore the characteristics of exchange reactions and identify which of the given options represents an example of this chemical process.
Exchange reactions are a subclass of double displacement reactions, where the cations and anions of two ionic compounds switch places to form new compounds. These reactions are often observed in aqueous solutions and can be represented by the general equation:
AB + CD → AD + CB
where A and C are cations, and B and D are anions.
Now, let’s examine the given options to determine which one represents an exchange reaction:
1. CH4 + 2O2 → CO2 + 2H2O
2. 2HCl + NaOH → NaCl + H2O
3. 2H2 + O2 → 2H2O
4. CaCO3 → CaO + CO2
Option 1 represents a combustion reaction, where methane (CH4) reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). This is not an exchange reaction since there is no swapping of atoms or ions.
Option 2, 2HCl + NaOH → NaCl + H2O, is a classic example of an exchange reaction. In this reaction, the hydrogen ions (H+) from hydrochloric acid (HCl) and the hydroxide ions (OH-) from sodium hydroxide (NaOH) switch places, forming sodium chloride (NaCl) and water (H2O).
Option 3, 2H2 + O2 → 2H2O, is a combination reaction, where hydrogen (H2) and oxygen (O2) combine to form water (H2O). This is not an exchange reaction since no atoms or ions are swapped.
Option 4, CaCO3 → CaO + CO2, is a decomposition reaction, where calcium carbonate (CaCO3) breaks down into calcium oxide (CaO) and carbon dioxide (CO2). This is not an exchange reaction since no atoms or ions are swapped.
In conclusion, the correct answer is:
2HCl + NaOH → NaCl + H2O
This reaction is an exchange reaction, as the hydrogen and hydroxide ions from the reactants switch places to form the products.
