Question

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

Explanation:

Step1: Identify reaction types

• For $4Fe + 3O_{2}

ightarrow2Fe_{2}O_{3}$, two substances combine to form one, so it's a synthesis reaction.

• For $2H_{2}O

ightarrow2H_{2}+O_{2}$, one compound breaks into simpler substances, so it's a decomposition reaction.

• For $Mg + CuSO_{4}

ightarrow MgSO_{4}+Cu$, one element replaces another in a compound, so it's a single - replacement reaction.

• For $HCl + NaOH

ightarrow NaCl + H_{2}O$, an acid and a base react to form a salt and water, so it's a neutralization reaction (a type of double - replacement).

• For $CH_{4}+2O_{2}

ightarrow CO_{2}+2H_{2}O$, a hydrocarbon reacts with oxygen to form carbon dioxide and water, so it's a combustion reaction.

Answer:

• $4Fe + 3O_{2}

ightarrow2Fe_{2}O_{3}$: synthesis

• $2H_{2}O

ightarrow2H_{2}+O_{2}$: decomposition

• $Mg + CuSO_{4}

ightarrow MgSO_{4}+Cu$: single replacement

• $HCl + NaOH

ightarrow NaCl + H_{2}O$: neutralization

• $CH_{4}+2O_{2}

ightarrow CO_{2}+2H_{2}O$: combustion