Question

match the following reactions to the correct description
combustion
ch₄ + 2o₂ → co₂ + 2h₂o
synthesis
hcl + koh → kcl + h₂o
decomposition
ba + mgso₄ → baso₄ + mg
single replacement
2h₂o → 2h₂ + o₂
double replacement
4al + 3o₂ → 2al₂o₃

Explanation:

• Combustion: A reaction where a substance reacts with oxygen, usually producing heat and light. Here, \(CH_4 + 2O_2

ightarrow CO_2+2H_2O\) is a combustion reaction as methane (\(CH_4\)) reacts with oxygen (\(O_2\)).

• Synthesis: A reaction where two or more substances combine to form a single product. \(4Al + 3O_2

ightarrow 2Al_2O_3\) is a synthesis reaction as aluminium (\(Al\)) and oxygen (\(O_2\)) combine to form aluminium oxide (\(Al_2O_3\)).

• Decomposition: A reaction where a single compound breaks down into two or more simpler substances. \(2H_2O

ightarrow 2H_2 + O_2\) is a decomposition reaction as water (\(H_2O\)) breaks down into hydrogen (\(H_2\)) and oxygen (\(O_2\)).

• Single - replacement: A reaction where one element replaces another in a compound. \(Ba+MgSO_4

ightarrow BaSO_4 + Mg\) is a single - replacement reaction as barium (\(Ba\)) replaces magnesium (\(Mg\)) in magnesium sulfate (\(MgSO_4\)).

• Double - replacement: A reaction where the positive and negative ions of two ionic compounds exchange places. \(HCl + KOH

ightarrow KCl + H_2O\) is a double - replacement reaction as the hydrogen (\(H^+\)) from hydrochloric acid (\(HCl\)) and potassium (\(K^+\)) from potassium hydroxide (\(KOH\)) exchange places.

Answer:

• \(CH_4 + 2O_2

ightarrow CO_2+2H_2O\): combustion

• \(HCl + KOH

ightarrow KCl + H_2O\): double replacement

• \(Ba+MgSO_4

ightarrow BaSO_4 + Mg\): single replacement

• \(2H_2O

ightarrow 2H_2 + O_2\): decomposition

• \(4Al + 3O_2

ightarrow 2Al_2O_3\): synthesis