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 types

• Combustion: A substance reacts with oxygen, often producing heat and light. For $CH_4 + 2O_2

ightarrow CO_2+2H_2O$, methane reacts with oxygen, so it's a combustion reaction.

• Synthesis: Two or more substances combine to form one product. For $4Fe + 3O_2

ightarrow 2Fe_2O_3$, iron and oxygen combine to form iron - oxide, so it's a synthesis reaction.

• Decomposition: One substance breaks down into two or more simpler substances. For $2H_2O

ightarrow 2H_2 + O_2$, water breaks down into hydrogen and oxygen, so it's a decomposition reaction.

• Single - replacement: One element replaces another in a compound. For $Mg+CuSO_4

ightarrow MgSO_4 + Cu$, magnesium replaces copper in copper sulfate, so it's a single - replacement reaction.

• Double - replacement: The positive and negative ions of two ionic compounds exchange places. For $HCl + NaOH

ightarrow NaCl + H_2O$, the ions in hydrochloric acid and sodium hydroxide exchange places, so it's a double - replacement reaction.

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