Chem. CH6 Review Questions
True/False: There is no purely covalent bond.
False
Why do atoms form chemical bonds?
They want a full outer shell of electrons, so they lose, gain, or share electrons with other elements, forming compounds, until they have 8 valence electrons and become stable.
True/False: A valence energy band containing innumerable energy levels accounts for the mirrorlike luster associated with metals.
True
True/False: It is not possible to identify a metallic bond between two or a few metal atoms. A metallic bond exists only in the presence of a great many metal atom
True
True/False: Many bonded atoms attain a stable electron configuration without having a valence octet.
True
True/False: There is no purely ionic bond.
True
Draw the Lewis structures of the following polyatomic ions:
a. b. c. d.
The following covalent compounds contain only single covalent bonds. Draw their Lewis structures.
a. b. c. d. e.
The following covalent compounds or ions each contain at least one double or triple bond. Draw their Lewis structures.
a. b. c. d. e. f.
Identify the types of atoms (metal or nonmetal) in the follow- ing compounds and then tell whether the compounds are pre- dominantly ionic, covalent, or metallic.
a. (NaCl) (metal and nonmetal; ionic bond) b. ??? c. (metal and nonmetal; ionic bond) d.(nonmetals; covalent bond) e. (Fe-Ni-Cr alloy) (metals; metallic bond)
Considering electron affinity alone, state the most probable way (losing, gaining, sharing) in which the following atoms could attain a valence octet. Also state the number of electrons involved.
a. K lose one electron → K⁺ b. Ca lose 2 electron → Ca²⁺ c. Ga lose 3 electrons → Ga³⁺ d. Ge lose 4 electrons → Ge⁴⁺ e. As gain 3 electrons → As³⁻ f. Se gain 2 electrons → Se²⁻ g. Br gain 1 electron → Br⁻ h. Kr (does neither- already has its stable octet) i. C lose 4 electrons → C⁴⁺
Which one of the three bond types is distinctly different from the other two? Explain why this is so.
metallic. this is because the metallic bond has characteristics of both ionic-polar and covalent-non polar bond.
