which of the following reactions are single replacement reactions? ca + s → cas na + hcl → h2 + nacl nacl →…

which of the following reactions are single replacement reactions? ca + s → cas na + hcl → h2 + nacl nacl → na + cl2 k + agcl → ag + kcl ch4 + o2 → h2o + co2 naoh + hcl → hoh + nacl

which of the following reactions are single replacement reactions? ca + s → cas na + hcl → h2 + nacl nacl → na + cl2 k + agcl → ag + kcl ch4 + o2 → h2o + co2 naoh + hcl → hoh + nacl

Answer

Explanation:

Step1: Recall single - replacement reaction definition

A single - replacement reaction has the general form $A + BC\rightarrow AC + B$ where an element replaces another element in a compound.

Step2: Analyze each reaction

  • For $Ca + S\rightarrow CaS$, it is a combination reaction ($A + B\rightarrow AB$), not a single - replacement reaction.
  • For $Na+HCl\rightarrow H_2 + NaCl$, sodium ($Na$) replaces hydrogen ($H$) in hydrochloric acid ($HCl$), so it is a single - replacement reaction.
  • For $NaCl\rightarrow Na + Cl_2$, it is a decomposition reaction ($AB\rightarrow A + B$), not a single - replacement reaction.
  • For $K + AgCl\rightarrow Ag+KCl$, potassium ($K$) replaces silver ($Ag$) in silver chloride ($AgCl$), so it is a single - replacement reaction.
  • For $CH_4 + O_2\rightarrow H_2O + CO_2$, it is a combustion reaction, not a single - replacement reaction.
  • For $NaOH + HCl\rightarrow HOH+NaCl$, it is a double - replacement reaction ($AB + CD\rightarrow AD+CB$), not a single - replacement reaction.

Answer:

$Na + HCl\rightarrow H_2 + NaCl$, $K + AgCl\rightarrow Ag + KCl$