Question

match the following reactions to the correct description. combustion synthesis decomposition single replacement double replacement ch₄ + 2o₂ → co₂ + 2h₂o hcl + naoh → nacl + h₂o mg + cuso₄ → mgso₄ + cu 2h₂o → 2h₂ + o₂ 4fe + 3o₂ → 2fe₂o₃

Explanation:

Step1: Identify reaction type for $CH_4 + 2O_2

ightarrow CO_2+2H_2O$
It's a combustion reaction as a hydrocarbon reacts with oxygen to produce carbon - dioxide and water.

Step2: Identify reaction type for $HCl + NaOH

ightarrow NaCl + H_2O$
It's a double - replacement reaction as the cations and anions of two ionic compounds switch places.

Step3: Identify reaction type for $Mg + CuSO_4

ightarrow MgSO_4+Cu$
It's a single - replacement reaction where one element replaces another in a compound.

Step4: Identify reaction type for $2H_2O

ightarrow 2H_2+O_2$
It's a decomposition reaction as a single compound breaks down into two simpler substances.

Step5: Identify reaction type for $4Fe + 3O_2

ightarrow 2Fe_2O_3$
It's a synthesis reaction as two substances combine to form one compound.

Answer:

$CH_4 + 2O_2
ightarrow CO_2+2H_2O$ - combustion
$HCl + NaOH
ightarrow NaCl + H_2O$ - double replacement
$Mg + CuSO_4
ightarrow MgSO_4+Cu$ - single replacement
$2H_2O
ightarrow 2H_2+O_2$ - decomposition
$4Fe + 3O_2
ightarrow 2Fe_2O_3$ - synthesis