Question

10/9 major u1lc2 summative (25)
match the following reactions to the correct description
4al + 3o₂ → 2al₂o₃
2h₂o → 2h₂ + o₂
ba + mgso₄ → baso₄ + mg
hcl + koh → kcl + h₂o
ch₄ + 2o₂ → co₂ + 2h₂o
combustion synthesis decomposition single replacement double replacement

Explanation:

Step1: Identify reaction type for $4Al + 3O_2

ightarrow2Al_2O_3$
Two substances combine to form one, it's synthesis.

Step2: Identify reaction type for $2H_2O

ightarrow2H_2 + O_2$
One substance breaks into two, it's decomposition.

Step3: Identify reaction type for $Ba+MgSO_4

ightarrow BaSO_4 + Mg$
One element replaces another in a compound, it's single - replacement.

Step4: Identify reaction type for $HCl + KOH

ightarrow KCl + H_2O$
Cations and anions of two compounds exchange places, it's double - replacement.

Step5: Identify reaction type for $CH_4+2O_2

ightarrow CO_2 + 2H_2O$
A compound reacts with oxygen to form carbon - dioxide and water, it's combustion.

Answer:

$4Al + 3O_2
ightarrow2Al_2O_3$ - synthesis
$2H_2O
ightarrow2H_2 + O_2$ - decomposition
$Ba+MgSO_4
ightarrow BaSO_4 + Mg$ - single replacement
$HCl + KOH
ightarrow KCl + H_2O$ - double replacement
$CH_4+2O_2
ightarrow CO_2 + 2H_2O$ - combustion