10.2.3 Quiz: Reaction TypesQuestion 10 Of 15Which One Of The Following Is A Double-displacement Reaction?A. $2 \, \text{Cu} (s) + \text{O}_2(g) \rightarrow 2 \, \text{CuO} (s$\]B. $4 \, \text{Fe} (s) + 3 \, \text{O}_2(g) \rightarrow 2 \,

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Understanding Reaction Types

In chemistry, reactions are classified into different types based on the way the reactants interact with each other. One of the key concepts in understanding reaction types is the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. This law helps us identify the type of reaction that is taking place.

What is a Double-Displacement Reaction?

A double-displacement reaction, also known as a metathesis reaction, is a type of chemical reaction where two compounds react to form two new compounds. In this type of reaction, the cations and anions of the two reactants switch places to form two new compounds. This type of reaction is also known as a double exchange reaction.

Identifying a Double-Displacement Reaction

To identify a double-displacement reaction, we need to look at the reactants and products of the reaction. If the reactants are two compounds that contain cations and anions, and the products are two new compounds that also contain cations and anions, then it is likely a double-displacement reaction.

Analyzing the Options

Let's analyze the options given in the quiz:

Option A: 2 Cu(s)+O2(g)→2 CuO(s)2 \, \text{Cu} (s) + \text{O}_2(g) \rightarrow 2 \, \text{CuO} (s)

In this reaction, copper (Cu) reacts with oxygen (O2) to form copper oxide (CuO). This is an example of a single displacement reaction, where one element displaces another element from a compound.

Option B: 4 Fe(s)+3 O2(g)→2 Fe2O3(s)4 \, \text{Fe} (s) + 3 \, \text{O}_2(g) \rightarrow 2 \, \text{Fe}_2\text{O}_3 (s)

In this reaction, iron (Fe) reacts with oxygen (O2) to form iron(III) oxide (Fe2O3). This is an example of a single displacement reaction, where one element displaces another element from a compound.

Option C: 2 NaCl(aq)+Ca(s)→2 Na(aq)+CaCl2(aq)2 \, \text{NaCl} (aq) + \text{Ca} (s) \rightarrow 2 \, \text{Na} (aq) + \text{CaCl}_2 (aq)

In this reaction, sodium chloride (NaCl) reacts with calcium (Ca) to form sodium (Na) and calcium chloride (CaCl2). This is an example of a double-displacement reaction, where the cations and anions of the two reactants switch places to form two new compounds.

Conclusion

Based on the analysis of the options, the correct answer is:

  • Option C: 2 NaCl(aq)+Ca(s)→2 Na(aq)+CaCl2(aq)2 \, \text{NaCl} (aq) + \text{Ca} (s) \rightarrow 2 \, \text{Na} (aq) + \text{CaCl}_2 (aq)

This is a double-displacement reaction, where the cations and anions of the two reactants switch places to form two new compounds.

Key Takeaways

  • A double-displacement reaction is a type of chemical reaction where two compounds react to form two new compounds.
  • To identify a double-displacement reaction, we need to look at the reactants and products of the reaction.
  • The cations and anions of the two reactants switch places to form two new compounds in a double-displacement reaction.

Practice Problems

  1. What is the type of reaction that occurs when two compounds react to form two new compounds?
  2. How do we identify a double-displacement reaction?
  3. What is the key characteristic of a double-displacement reaction?

Answer Key

  1. Double-displacement reaction
  2. By looking at the reactants and products of the reaction
  3. The cations and anions of the two reactants switch places to form two new compounds.
    10.2.3 Quiz: Reaction Types ==============================

Q&A: Reaction Types

Frequently Asked Questions

Q: What is a double-displacement reaction?

A: A double-displacement reaction, also known as a metathesis reaction, is a type of chemical reaction where two compounds react to form two new compounds. In this type of reaction, the cations and anions of the two reactants switch places to form two new compounds.

Q: How do we identify a double-displacement reaction?

A: To identify a double-displacement reaction, we need to look at the reactants and products of the reaction. If the reactants are two compounds that contain cations and anions, and the products are two new compounds that also contain cations and anions, then it is likely a double-displacement reaction.

Q: What is the key characteristic of a double-displacement reaction?

A: The key characteristic of a double-displacement reaction is that the cations and anions of the two reactants switch places to form two new compounds.

Q: Can you give an example of a double-displacement reaction?

A: Yes, here is an example of a double-displacement reaction:

2 NaCl(aq)+Ca(s)→2 Na(aq)+CaCl2(aq)2 \, \text{NaCl} (aq) + \text{Ca} (s) \rightarrow 2 \, \text{Na} (aq) + \text{CaCl}_2 (aq)

In this reaction, sodium chloride (NaCl) reacts with calcium (Ca) to form sodium (Na) and calcium chloride (CaCl2).

Q: What is the difference between a double-displacement reaction and a single displacement reaction?

A: The main difference between a double-displacement reaction and a single displacement reaction is that in a double-displacement reaction, the cations and anions of the two reactants switch places to form two new compounds, whereas in a single displacement reaction, one element displaces another element from a compound.

Q: Can you give an example of a single displacement reaction?

A: Yes, here is an example of a single displacement reaction:

2 Cu(s)+O2(g)→2 CuO(s)2 \, \text{Cu} (s) + \text{O}_2(g) \rightarrow 2 \, \text{CuO} (s)

In this reaction, copper (Cu) reacts with oxygen (O2) to form copper oxide (CuO).

Q: What is the importance of understanding reaction types?

A: Understanding reaction types is important because it helps us predict the products of a reaction and understand the underlying chemistry of the reaction.

Q: Can you summarize the key points of this article?

A: Yes, here is a summary of the key points of this article:

  • A double-displacement reaction is a type of chemical reaction where two compounds react to form two new compounds.
  • To identify a double-displacement reaction, we need to look at the reactants and products of the reaction.
  • The cations and anions of the two reactants switch places to form two new compounds in a double-displacement reaction.
  • A single displacement reaction is a type of chemical reaction where one element displaces another element from a compound.
  • Understanding reaction types is important because it helps us predict the products of a reaction and understand the underlying chemistry of the reaction.

Practice Problems

  1. What is the type of reaction that occurs when two compounds react to form two new compounds?
  2. How do we identify a double-displacement reaction?
  3. What is the key characteristic of a double-displacement reaction?
  4. Can you give an example of a double-displacement reaction?
  5. What is the difference between a double-displacement reaction and a single displacement reaction?

Answer Key

  1. Double-displacement reaction
  2. By looking at the reactants and products of the reaction
  3. The cations and anions of the two reactants switch places to form two new compounds.
  4. 2 NaCl(aq)+Ca(s)→2 Na(aq)+CaCl2(aq)2 \, \text{NaCl} (aq) + \text{Ca} (s) \rightarrow 2 \, \text{Na} (aq) + \text{CaCl}_2 (aq)
  5. A double-displacement reaction involves the cations and anions of the two reactants switching places to form two new compounds, whereas a single displacement reaction involves one element displacing another element from a compound.