Question

HCl(aq)+Li2CO3(aq)→
Express your answer as a chemical equation. Identify all of the phases in your answer. Enter noreaction if no precipitate is formed.

Answer 1

2HCl + Li2CO3 = 2LiCl(aq) + CO2(g) + H2O
BUT
LiCl is in the form Li+ and CL-
no precipitate
so they tell you to say no reaction, although CO2 bubbles off indicating that there was a reaction :) Beats me.

Answer 2

Perhaps I can clear that up. No reaction is not an option in this case.
In simple terms a reaction occurs when
a. a ppt is formed
b. a gas is formed or
c. a weak electrolyte is formed (such as H2O)

So a reaction does take place for both b and c reasons.
Since the question wants phases I would write
2HCl (aq) + Li2CO3(aq) ==> 2LiCl(aq) + CO2(g) + H2O()l)

Other kinds of reactions are redox, etc that may or may not conform to the three simple reasons above.