Classify each of these reactions. ba(clo3)2 → bacl2 3 o2 double replacement combination single replacement decomposition cao co2 → caco3 double replacement single replacement combination decomposition nano2 2 hcl → nacl hno2 single replacement combination double replacement decomposition mg znso4 → mgso4 zn single replacement combination double replacement decomposition

Ba(ClO₃)₂ → BaCl₂ +  3 O₂ Descomposition.

CaO + CO₂ → CaCO₃ Combination.

NaNO₂ +  HCl → NaCl + HNO₂ Double replacement.

Mg + ZnSO₄ → MgSO₄ + Zn Single replacement.

Explanation:

A combination reaction is defined as a reaction in which two or more substances combine to form a single new substance.

A + B → AB

A descomposition reaction is defined as a reaction in which a compound breaks down into two or more simpler substances.

AB → A + B

A double replacement is a chemical reaction were the positive and negative ions of two ionic compounds exchange places to form two new compounds.

AB + CD → AD + CB

A single replacement is another type of reaction were one element replaces a similar element in a compound.

A + BC → AC + B

Thus, with this information it is possible to classify these reactions as:

Ba(ClO₃)₂ → BaCl₂ +  3 O₂ Descomposition. One single molecule breaks down into two or more molecules

CaO + CO₂ → CaCO₃ Combination. Two substances are combined to form one single molecule

NaNO₂ +  HCl → NaCl + HNO₂ Double replacement. Na and H are exchange places to form two new compounds

Mg + ZnSO₄ → MgSO₄ + Zn Single replacement. Mg is replacing Zn.

I hope it helps!