Question

1 multiple choice 10 points supply the name for pcl5 phosphorus (i) chloride phosphorus (v) chloride phosphorus pentachloride monophosphorus pentachloride 2 multiple choice 10 points provide the chemical formula for potassium chloride pcl2 kcl kcl2 pci

Explanation:

1. In naming covalent compounds, the prefixes indicate the number of atoms of each element. For $PCl_5$, 'penta -' means five, and it is named phosphorus pentachloride. The Roman numeral notations are used for ionic compounds with transition metals to show the oxidation state, which is not applicable here. Also, the prefix'mono -' is usually not used for the first element when there is only one atom of it in binary covalent compounds.
2. Potassium has a +1 charge ($K^+$) and chlorine has a - 1 charge ($Cl^-$). To form a neutral compound, the ratio of potassium to chlorine is 1:1, so the chemical formula is KCl.

Answer:

1. C. phosphorus pentachloride
2. B. KCl