Answered

IDNLearn.com provides a user-friendly platform for finding and sharing accurate answers. Our experts provide timely, comprehensive responses to ensure you have the information you need.

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 :

GinnyAnsweridn
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].
Thank you for being part of this discussion. Keep exploring, asking questions, and sharing your insights with the community. Together, we can find the best solutions. Find clear answers at IDNLearn.com. Thanks for stopping by, and come back for more reliable solutions.