Match the reaction types with the correct equations.

____ $SO_3 + H_2O \rightarrow H_2SO_4$

____ $CaCO_3 \rightarrow CaO + CO_2$

____ $Pb + FeSO_4 \rightarrow PbSO_4 + Fe$

____ $MgCl_2 + Li_2CO_3 \rightarrow MgCO_3 + 2LiCl$

____ $C_6H_{12} + 9O_2 \rightarrow 6CO_2 + 6H_2O$

Choices:

decomposition
double replacement
combustion
synthesis
single replacement

Question

castellonosp castellonosp

06-11-2026
Chemistry

Answered

Match the reaction types with the correct equations.

____ $SO_3 + H_2O \rightarrow H_2SO_4$

____ $CaCO_3 \rightarrow CaO + CO_2$

____ $Pb + FeSO_4 \rightarrow PbSO_4 + Fe$

____ $MgCl_2 + Li_2CO_3 \rightarrow MgCO_3 + 2LiCl$

____ $C_6H_{12} + 9O_2 \rightarrow 6CO_2 + 6H_2O$

Choices:

decomposition
double replacement
combustion
synthesis
single replacement

Verified Answer :

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GinnyAnswer GinnyAnswer · Answer 1 · 2026-11-06T19:12:29-05:00

$SO_3 + H_2O \rightarrow H_2SO_4$ is a synthesis reaction as two reactants form one product.
$CaCO_3 \rightarrow CaO + CO_2$ is a decomposition reaction as one reactant breaks down into two.
$Pb + FeSO_4 \rightarrow PbSO_4 + Fe$ is a single replacement reaction as an element displaces another in a compound.
$MgCl_2 + Li_2CO_3 \rightarrow MgCO_3 + 2LiCl$ is a double replacement reaction as two compounds exchange ions.
$C_6H_{12} + 9O_2 \rightarrow 6CO_2 + 6H_2O$ is a combustion reaction as a hydrocarbon reacts with oxygen to form $CO_2$ and $H_2O$.
Final categorization: 1. synthesis, 2. decomposition, 3. single replacement, 4. double replacement, 5. combustion.

Explanation

Analysis of Reaction Types

We need to classify five chemical reactions based on their structure and components. The reaction types are defined as follows:

Synthesis: Two or more reactants combine to form a single product ($A + B \rightarrow AB$).
Decomposition: A single reactant breaks down into two or more simpler products ($AB \rightarrow A + B$).
Single replacement: A single element replaces another element in a compound ($A + BC \rightarrow AC + B$).
Double replacement: Two compounds exchange components to form two new compounds ($AB + CD \rightarrow AD + CB$).
Combustion: A substance reacts with oxygen, typically releasing energy and producing carbon dioxide ($CO_2$) and water ($H_2O$) ($C_xH_y + O_2 \rightarrow CO_2 + H_2O$).

Classification of Reactions
$SO_3 + H_2O \rightarrow H_2SO_4$: Two substances combine to produce one new substance. This matches the definition of synthesis.
$CaCO_3 \rightarrow CaO + CO_2$: One reactant breaks down into two simpler substances. This matches the definition of decomposition.
$Pb + FeSO_4 \rightarrow PbSO_4 + Fe$: The element lead ($Pb$) displaces iron ($Fe$) in the iron(II) sulfate compound. This matches the definition of single replacement.
$MgCl_2 + Li_2CO_3 \rightarrow MgCO_3 + 2LiCl$: The cations (magnesium and lithium) exchange their respective anions (chloride and carbonate), forming two new compounds. This matches the definition of double replacement.
$C_6H_{12} + 9O_2 \rightarrow 6CO_2 + 6H_2O$: A hydrocarbon reacts with oxygen, producing carbon dioxide and water as products. This matches the definition of combustion.

Final Classification

The reactions are categorized as follows:

$SO_3 + H_2O \rightarrow H_2SO_4$ : synthesis
$CaCO_3 \rightarrow CaO + CO_2$ : decomposition
$Pb + FeSO_4 \rightarrow PbSO_4 + Fe$ : single replacement
$MgCl_2 + Li_2CO_3 \rightarrow MgCO_3 + 2LiCl$ : double replacement
$C_6H_{12} + 9O_2 \rightarrow 6CO_2 + 6H_2O$ : combustion

Examples

Understanding chemical reaction types helps in predicting products and balancing equations in various fields. For example, in environmental chemistry, identifying combustion reactions is crucial for analyzing emissions from vehicles. In industrial manufacturing, understanding decomposition and synthesis allows chemists to design efficient processes for creating essential materials like cement or sulfuric acid. This foundational knowledge is key to mastering chemical reactions in everyday science.