Chemical Reactions (Balancing + Explanations)

Question

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Answer 1

(1) Since only a single reactant, you know this is decomposition.

Al₂(CO₃)₃(s) ==> Al₂O₃(s)+ 3CO₂(g)

(2) Since there is a lone element combining with a compound, it is a single replacement reaction (A + BC).

2 Zn(s) + Sn(NO₃)₄(aq) ==> 2 Zn(NO₃)₂(aq) + Sn(s)

(3) Two reactants of the form AB + CD so it is double replacement.

MgSO₃(aq) + Pb(NO₃)₂(aq) ==> Mg(NO₃)₂(aq) + PbSO₃(s)

(4) Two reactant of the form AB + CD so it is double replacement. HOWEVER, all reactants and products are soluble and fully dissociated, so NO REACTION

(5) A hydrocarbon plus oxygen = a combustion reaction where products will be CO2 and H2O

2C₂H₂(g) + 5O₂(g) ==> 4CO₂(g) + 2H₂O(l)