21. For each of the following precipitation reactions, complete and balance the equation, indicating
clearly which product is the precipitate. If no reaction
would be expected, so indicate.
a. (NH4)2SO4(aq) + Ba(NO3)2(aq) →
b. HS(aq) + NiSO4(aq) →
c. FeCl3(aq) + NaOH(aq) →

Elements that do not have full outer electron shells will donate, share, or take electrons from other atoms. choose the items that have the correct binary ionic formula.

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

The ammonia molecule in the diagram has the observed bond orientation because