3. Write the cation and anion along with their charges present in the following compounds. \begin{tabular}{|l|l|l|} \hline \multicolumn{1}{|c|}{ Compound } & Cation & Anion \\ \hline Na2CO3 & & \\ \hline K25 & & \\ \hline(NH4)2SO4 & & \\ \hline Cas3(PO4)2 & & \\ \hline H3PO4 & & \\ \hline \end{tabular} 4. Identify the following compounds as ionic (I) or covalent (C) compounds and justify your answer. \begin{tabular}{|l|l|l|} \hline Compound & Ionic (I) or Covalent (C) & Justification \\ \hline CCl4 & & \\ \hline BF3 & & \\ \hline SiO2 & & \\ \hline(NH4)2SO4 & & \\ \hline HBr(aq) & & \\ \hline H2SO4(aq) & & \\ \hline \end{tabular}