Answered

Classify each of the following chemical reactions:


  1. $S+O_2 \rightarrow SO_2$
  2. $CaCl_2+2 AgNO_3 \rightarrow Ca\left(NO_3\right)_2+2 AgCl$
  3. $Zn+CuSO_4 \rightarrow Cu+ZnSO_4$
  4. $2 Na_2 O \rightarrow 4 Na+O_2$

Verified Answer :

  • \(S + O_2 \rightarrow SO_2\) is a Synthesis reaction because two substances combine to form one.
  • \(CaCl_2 + 2 AgNO_3 \rightarrow Ca(NO_3)_2 + 2 AgCl\) is a Double Replacement reaction because ions are exchanged between two compounds.
  • \(Zn + CuSO_4 \rightarrow Cu + ZnSO_4\) is a Single Replacement reaction because one element replaces another in a compound.
  • \(2 Na_2 O \rightarrow 4 Na + O_2\) is a Decomposition reaction because one reactant breaks down into multiple products.

Explanation

  1. Analysis of Reaction Types

To classify the given chemical reactions, we compare their structures to the four standard types of chemical reactions:

  1. Synthesis (Combination): Two or more reactants combine to form a single product (\(A + B \rightarrow AB\)).
  2. Decomposition: A single reactant breaks down into two or more simpler products (\(AB \rightarrow A + B\)).
  3. Single Replacement: An element takes the place of another element in a compound (\(A + BC \rightarrow B + AC\)).
  4. Double Replacement: The ions of two compounds swap places to form two new compounds (\(AB + CD \rightarrow AD + CB\)).

We will now examine each specific reaction provided based on these definitions.

  1. Classification of Reactions
  2. For the reaction \(S + O_2 \rightarrow SO_2\): We see two reactants, sulfur (S) and oxygen (\(O_2\)), combining to form a single product, sulfur dioxide (\(SO_2\)). This fits the pattern \(A + B \rightarrow C\), which characterizes a Synthesis reaction.
  1. For the reaction \(CaCl_2 + 2 AgNO_3 \rightarrow Ca(NO_3)_2 + 2 AgCl\): We observe two compounds reacting. The calcium ion (\(Ca^{2+}\)) and the silver ion (\(Ag^+\)) swap their partner anions, nitrate (\(NO_3^-\)) and chloride (\(Cl^-\)). This exchange of ions to form two new compounds defines a Double Replacement reaction.
  1. For the reaction \(Zn + CuSO_4 \rightarrow Cu + ZnSO_4\): Zinc (Zn), an element, reacts with copper(II) sulfate (\(CuSO_4\)), a compound. Zinc displaces the copper to form zinc sulfate (\(ZnSO_4\)), and copper is released as an element. This fits the pattern \(A + BC \rightarrow B + AC\), which is a Single Replacement reaction.
  1. For the reaction \(2 Na_2 O \rightarrow 4 Na + O_2\): We have one reactant, sodium oxide (\(Na_2O\)), breaking apart into two simpler products, sodium (Na) and oxygen (\(O_2\)). This process of a single substance splitting into multiple products is characteristic of a Decomposition reaction.
  1. Final Conclusion

Based on the analysis, we have determined the type for each reaction:

  • \(S + O_2 \rightarrow SO_2\): Synthesis
  • \(CaCl_2 + 2 AgNO_3 \rightarrow Ca(NO_3)_2 + 2 AgCl\): Double Replacement
  • \(Zn + CuSO_4 \rightarrow Cu + ZnSO_4\): Single Replacement
  • \(2 Na_2 O \rightarrow 4 Na + O_2\): Decomposition

This concludes our classification of the provided chemical equations.

Examples

Understanding chemical reaction types is essential in fields like industrial chemistry and environmental science. For instance, in water treatment, knowing whether a reaction is a double replacement helps engineers predict the formation of precipitates (like removing calcium or magnesium ions from hard water). By identifying the type of reaction, scientists can predict the products and efficiency of processes like fuel combustion, metal extraction, or pharmaceutical synthesis, ensuring safer and more efficient outcomes in laboratory and industrial settings.

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