Predict whether or not a reaction occurs. Balance the reaction and answer the questions.

Question

1. __ HCl ( ) + __ NaHCO3 ( ) ->
2. __ Mg ( ) + __ O2 ( ) ->
3. __ Ca(OH)2 ( ) + __ H2SO4 ( ) ->

Identify the type of reaction (precipitation, acid-base, gas evolution, oxidation-reduction, neutralization, combustion)

Answer 1

HCl(aq) + NaHCO₃(aq) ==> NaHCO₃(aq) + H₂CO₃(aq) ==> NaHCO₃(aq) + CO₂(g) + H₂O(l) .. acid-base and gas evolution, neutralization

2Mg(s) + O₂(g) ==> 2MgO(s) .. oxidation-reduction

Ca(OH)2(s) + H2SO4(aq) ==> CaSO4(s) + 2H2O(l) .. acid-base, neutralization, ppt (note: calcium hydroxide and calcium sulfate have limited solubility so have been given phases of (s), solid or insoluble. Others may assign (aq), but that's a matter of discussion).

Answer 2

HCl ( aq ) + NaHCO3 ( aq ) ---------> NaCl (aq) + H2O (l) + CO2 (g)

Acid base, Gas evolution, and neutralization reaction.

2Mg (s) + O2 ( g) --------------> 2MgO ( s) Oxidation-reduction reaction ( Redox Reaction )

Ca(OH)2 (s) + H2SO4 (aq) --------------> CaSO4 (s) + 2H2O (l)

acis-base, neutralization,

A precipitation reaction is one in which both the reactants are in aquous solution, but here in this reaction one of the reactants is a solid , so it is not a precipitation reaction. (If I am wrong please educate me on this)