What are the balanced equation for the following reactions:

Question

HCl and Sodium Hydrogen Carbonate

HCl and Copper oxide

HCl and Calcium carbonate

HCl and Magnesium

NaOH and Ammonium Chloride

Answer 1

Obviously this is an exercise in helping you become familiar with the formulas of compounds. Here is the first one. Just let the words tell you what to do.
HCl + 3NaHCO3 ==> Na2CO3 + 2H2O + 2CO2 + NaCl

There are two copper oxides. I don't know which you want. One is CuO, the other is Cu2O. CuO should be written either as copper(II) oxide or cupric oxide. Cu2O should be written either as copper(I) oxide or cuprous oxide.

Here is a good site to pick the others. I recommend you memorize the common ones. One way to do that is to practice writing equations enough that the use of the cations and anions become memorized just from usage.
(Broken Link Removed)