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Difficulty: HardChemical Reactions and Compounds

Chemical transformations involve the rearrangement of atoms and bonds to create distinct substances. Match each described chemical reaction on the left with its corresponding balanced chemical equation on the right.

  • Thermal decomposition of calcium carbonate yielding solid calcium oxide and carbon dioxide gasCaCO3(s)→CaO(s)+CO2(g)\text{CaCO}_3(\text{s}) \rightarrow \text{CaO}(\text{s}) + \text{CO}_2(\text{g})
  • Single displacement of silver from aqueous silver nitrate using solid copper metalCu(s)+2AgNO3(aq)→Cu(NO3)2(aq)+2Ag(s)\text{Cu}(\text{s}) + 2\text{AgNO}_3(\text{aq}) \rightarrow \text{Cu}(\text{NO}_3)_2(\text{aq}) + 2\text{Ag}(\text{s})
  • Neutralization between sulfuric acid and sodium hydroxide forming sodium sulfate and waterH2SO4(aq)+2NaOH(aq)→Na2SO4(aq)+2H2O(l)\text{H}_2\text{SO}_4(\text{aq}) + 2\text{NaOH}(\text{aq}) \rightarrow \text{Na}_2\text{SO}_4(\text{aq}) + 2\text{H}_2\text{O}(\text{l})
  • Complete combustion of ethanol producing carbon dioxide and water vaporC2H5OH(l)+3O2(g)→2CO2(g)+3H2O(g)\text{C}_2\text{H}_5\text{OH}(\text{l}) + 3\text{O}_2(\text{g}) \rightarrow 2\text{CO}_2(\text{g}) + 3\text{H}_2\text{O}(\text{g})

Answer

Each reaction description matches its stoichiometrically balanced chemical equation representing the correct reaction archetype (decomposition, single displacement, neutralization, and combustion).
The correct pairings accurately connect standard chemical nomenclature and reaction archetypes (decomposition, single displacement, acid-base neutralization, and hydrocarbon combustion) to their fully balanced IUPAC stoichiometric equations.

Step-by-Step Solution

1
Identify reactants, products, and reaction classification for each narrative prompt.
Decomposition produces simpler compounds from one reactant; displacement involves an elemental metal replacing an aqueous cation; neutralization pairs an acid and base to form salt and water; combustion combines a hydrocarbon/alcohol with oxygen to yield carbon dioxide and water.
Categorizing the reaction type narrows the corresponding structural formula patterns.
2
Verify chemical formulas and conservation of mass (balancing coefficients) for each equation.
Thermal decomposition corresponds to CaCO3→CaO+CO2\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2; single displacement corresponds to Cu+2AgNO3→Cu(NO3)2+2Ag\text{Cu} + 2\text{AgNO}_3 \rightarrow \text{Cu}(\text{NO}_3)_2 + 2\text{Ag}; neutralization corresponds to H2SO4+2NaOH→Na2SO4+2H2O\text{H}_2\text{SO}_4 + 2\text{NaOH} \rightarrow \text{Na}_2\text{SO}_4 + 2\text{H}_2\text{O}; combustion corresponds to C2H5OH+3O2→2CO2+3H2O\text{C}_2\text{H}_5\text{OH} + 3\text{O}_2 \rightarrow 2\text{CO}_2 + 3\text{H}_2\text{O}.
Every atom must balance across the reaction arrow in accordance with the Law of Conservation of Mass.

Key Concept

Classification and Stoichiometric Balancing of Chemical Reactions
Estimated Time:2m 0s
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Topics

Chemical Reactions and Compounds

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