Which type of reaction has the general formula of [tex]$A B+C D \rightarrow A D+C B$[/tex]?
A. synthesis
B. decomposition
C. oxidation
D. replacement
Answer (2)
The given reaction is in the form A B + C D → A D + CB .
Synthesis reactions combine reactants, decomposition reactions break down reactants, and oxidation involves electron loss.
Replacement reactions involve one element or group replacing another.
The given reaction is a double replacement reaction, where two compounds exchange their partners, so the answer is \boxed{replacement}.
Explanation
Understanding the Reaction We are given a chemical reaction in the form A B + C D → A D + CB and asked to identify the type of reaction it represents from the given options: synthesis, decomposition, oxidation, and replacement.
Analyzing Reaction Types Let's analyze each type of reaction:
Synthesis: Two or more reactants combine to form a single product (e.g., A + B → A B ).
Decomposition: A single reactant breaks down into two or more products (e.g., A B → A + B ).
Oxidation: Involves the loss of electrons (or increase in oxidation state).
Replacement: One element or group replaces another in a compound. This can be a single replacement (e.g., A + BC → A C + B ) or a double replacement (e.g., A B + C D → A D + CB ).
Identifying the Reaction Type The given reaction A B + C D → A D + CB involves two compounds exchanging their 'partners'. Specifically, A switches from being paired with B to being paired with D , and C switches from being paired with D to being paired with B . This is the defining characteristic of a double replacement reaction, also sometimes called a double displacement reaction.
Conclusion Therefore, the correct answer is replacement , as the reaction represents a double replacement (or double displacement) reaction.
Examples
Double replacement reactions are commonly seen in everyday life, such as in the formation of precipitates in water treatment. For example, when hard water containing calcium ions ( C a 2 + ) is treated with sodium carbonate ( N a 2 C O 3 ), calcium carbonate ( C a C O 3 ) precipitates out, softening the water. This reaction can be represented as: C a C l 2 ( a q ) + N a 2 C O 3 ( a q ) → C a C O 3 ( s ) + 2 N a Cl ( a q ) . This process helps in removing unwanted minerals from the water, making it suitable for various uses.
The given chemical reaction A B + C D → A D + CB is a double replacement reaction since the compounds exchange their partners. Therefore, the correct answer is re pl a ce m e n t .
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