Essay Quiz


1		Describe how the following are alike and how they are different: (a) a sodium atom and a sodium ion, and (b) a sodium ion and a neon atom.



2		What is the difference between a polar covalent bond and a nonpolar covalent bond?



3		What is the difference between an ionic and covalent bond? What do atoms forming the two bond types have in common?



4		What is the octet rule?



5		Is there a relationship between the number of valence electrons and how many covalent bonds an atom can form? Explain.



6		Write electron dot formulas for molecules formed when hydrogen combines with (a) chlorine, (b) oxygen, and (c) carbon.



7		Sodium fluoride is often added to water supplies to strengthen teeth. Is sodium fluoride ionic, nonpolar covalent, or polar covalent? Explain the basis of your answer.



8		What is the modern systematic name of a compound with the formula (a) SnF₂? (b) PbS?



9		What kinds of elements are found in (a) ionic compounds with a name ending with an "-ide" suffix? (b) covalent compounds with a name ending with an "-ide" suffix?



10		Why is it necessary to use a system of Greek prefixes to name binary covalent compounds?



11		What are variable-charge ions? Explain how variable-charge ions are identified in the modern systematic system of naming compounds.



12		What is a polyatomic ion? Give the names and formulas for several common polyatomic ions.



13		Write the formula for magnesium hydroxide. Explain what the parentheses mean.



14		What is a double bond? A triple bond?

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