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Which of the following is a double replacement reaction?

A. [tex]Ca(OH)_2 + H_2SO_4 \rightarrow CaSO_4 + 2H_2O[/tex]
B. [tex]CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O[/tex]
C. [tex]8Fe + S_8 \rightarrow 8FeS[/tex]
D. [tex]Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2[/tex]

Sagot :

GinnyAnswer
To determine which of the given reactions is a double replacement reaction, let's carefully examine each reaction type.

1. [tex]\( Ca(OH)_2 + H_2SO_4 \rightarrow CaSO_4 + 2H_2O \)[/tex]

In a double replacement reaction, two compounds react, and their cations and anions exchange places, forming two new compounds.
- Reactants: [tex]\( Ca(OH)_2 \)[/tex] and [tex]\( H_2SO_4 \)[/tex]
- Products: [tex]\( CaSO_4 \)[/tex] and [tex]\( 2H_2O \)[/tex]

The cations [tex]\( Ca^{2+} \)[/tex] from [tex]\( Ca(OH)_2 \)[/tex] and [tex]\( H^+ \)[/tex] from [tex]\( H_2SO_4 \)[/tex] switch places with the anions [tex]\( OH^- \)[/tex] and [tex]\( SO_4^{2-} \)[/tex], forming the new compounds [tex]\( CaSO_4 \)[/tex] and [tex]\( H_2O \)[/tex].

This reaction fits the definition of a double replacement reaction.

2. [tex]\( CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O \)[/tex]

This is a combustion reaction, where a hydrocarbon (methane, [tex]\( CH_4 \)[/tex]) reacts with oxygen ([tex]\( O_2 \)[/tex]) to produce carbon dioxide ([tex]\( CO_2 \)[/tex]) and water ([tex]\( H_2O \)[/tex]). There is no exchange of cations and anions between two compounds, so it is not a double replacement reaction.

3. [tex]\( 8Fe + S_8 \rightarrow 8FeS \)[/tex]

This is a synthesis reaction, where iron ([tex]\( Fe \)[/tex]) and sulfur ([tex]\( S_8 \)[/tex]) combine to form iron sulfide ([tex]\( FeS \)[/tex]). There is no exchange of ions between two compounds, so it does not fit the criteria for a double replacement reaction.

4. [tex]\( Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2 \)[/tex]

This is a single replacement (displacement) reaction, where zinc ([tex]\( Zn \)[/tex]) displaces hydrogen from sulfuric acid ([tex]\( H_2SO_4 \)[/tex]) to form zinc sulfate ([tex]\( ZnSO_4 \)[/tex]) and hydrogen gas ([tex]\( H_2 \)[/tex]). Again, there is no exchange of cations and anions between two compounds, so it is not a double replacement reaction.

Based on this analysis, the only double replacement reaction is:
[tex]\[ Ca(OH)_2 + H_2SO_4 \rightarrow CaSO_4 + 2H_2O \][/tex]

So, the answer is [tex]\( 1 \)[/tex].
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