Let's analyze the given chemical equation step by step to determine the reaction type.
The equation is:
[tex]\[ 2C_2H_2 + 5O_2 \rightarrow 4CO_2 + 2H_2O \][/tex]
1. Identify the reactants and products:
- Reactants: [tex]\( C_2H_2 \)[/tex] (acetylene) and [tex]\( O_2 \)[/tex] (oxygen).
- Products: [tex]\( CO_2 \)[/tex] (carbon dioxide) and [tex]\( H_2O \)[/tex] (water).
2. Analyze the nature of the reaction:
- This reaction involves a hydrocarbon ([tex]\( C_2H_2 \)[/tex]) reacting with oxygen ([tex]\( O_2 \)[/tex]), which is a typical feature of a combustion reaction.
- Combustion reactions typically produce carbon dioxide ([tex]\( CO_2 \)[/tex]) and water ([tex]\( H_2O \)[/tex]) as products.
- The reactants are being burned in the presence of oxygen to form oxides.
3. Eliminate incorrect options:
- Decomposition (A): This type involves a single compound breaking down into two or more simpler substances. This does not fit, as the reaction starts with two reactants.
- Combination (B): This type involves two or more substances combining to form one compound. The given reaction does not fit this pattern as it has more products than reactants.
- Single-replacement (D): This type involves one element replacing another in a compound. The reaction given does not exhibit this pattern.
- Double-replacement (E): This type involves the exchange of ions between two compounds to form two new compounds. The reaction does not fit this pattern.
4. Correct option:
- Combustion (C): The given equation represents the burning of a hydrocarbon (acetylene) in the presence of oxygen to produce carbon dioxide and water, which is the hallmark of a combustion reaction.
Therefore, the reaction type depicted by the equation [tex]\( 2C_2H_2 + 5O_2 \rightarrow 4CO_2 + 2H_2O \)[/tex] is combustion.
The correct answer is:
C. combustion
