Questions: Which of the following is a DOUBLE-REPLACEMENT reaction? 4 NaCl(s) + O2(g) → 2 Na2 O(s) + 2 Cl2(g) 2 NaCl(s) + 3 O2(g) → 2 NaClO3(s) 2 NaCl(aq) + CaO(aq) → Na2 O(aq) + CaCl2(aq) 2 NaClO3(s) → 2 NaCl(s) + 3 O2(g)

Which of the following is a DOUBLE-REPLACEMENT reaction?
4 NaCl(s) + O2(g) → 2 Na2 O(s) + 2 Cl2(g)
2 NaCl(s) + 3 O2(g) → 2 NaClO3(s)
2 NaCl(aq) + CaO(aq) → Na2 O(aq) + CaCl2(aq)
2 NaClO3(s) → 2 NaCl(s) + 3 O2(g)
Transcript text: Which of the following is a DOUBLE-REPLACEMENT reaction? $4 \mathrm{NaCl}(s)+\mathrm{O}_{2}(g) \rightarrow 2 \mathrm{Na}_{2} \mathrm{O}(s)+2 \mathrm{Cl}_{2}(g)$ $2 \mathrm{NaCl}(s)+3 \mathrm{O}_{2}(g) \rightarrow 2 \mathrm{NaClO}_{3}(s)$ $2 \mathrm{NaCl}(a q)+\mathrm{CaO}(a q) \rightarrow \mathrm{Na}_{2} \mathrm{O}(a q)+\mathrm{CaCl}_{2}(a q)$ $2 \mathrm{NaClO}_{3}(s) \rightarrow 2 \mathrm{NaCl}(s)+3 \mathrm{O}_{2}(g)$
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Solution

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Solution Steps

Step 1: Identify the Reaction Types

To determine which reaction is a double-replacement reaction, we need to understand the characteristics of different types of chemical reactions. A double-replacement reaction involves the exchange of ions between two compounds, resulting in the formation of two new compounds.

Step 2: Analyze Each Reaction

Let's analyze each given reaction to identify the double-replacement reaction:

  1. \( 4 \mathrm{NaCl}(s) + \mathrm{O}_{2}(g) \rightarrow 2 \mathrm{Na}_{2} \mathrm{O}(s) + 2 \mathrm{Cl}_{2}(g) \)

    • This is a decomposition reaction where a compound breaks down into simpler substances.
  2. \( 2 \mathrm{NaCl}(s) + 3 \mathrm{O}_{2}(g) \rightarrow 2 \mathrm{NaClO}_{3}(s) \)

    • This is a synthesis reaction where simpler substances combine to form a more complex compound.
  3. \( 2 \mathrm{NaCl}(a q) + \mathrm{CaO}(a q) \rightarrow \mathrm{Na}_{2} \mathrm{O}(a q) + \mathrm{CaCl}_{2}(a q) \)

    • This is a double-replacement reaction where the ions of the reactants exchange places to form two new compounds.
  4. \( 2 \mathrm{NaClO}_{3}(s) \rightarrow 2 \mathrm{NaCl}(s) + 3 \mathrm{O}_{2}(g) \)

    • This is a decomposition reaction where a compound breaks down into simpler substances.

Final Answer

The double-replacement reaction is: \[ \boxed{2 \mathrm{NaCl}(a q) + \mathrm{CaO}(a q) \rightarrow \mathrm{Na}_{2} \mathrm{O}(a q) + \mathrm{CaCl}_{2}(a q)} \]

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