Multiple Choice
Which molecule/s contain/snet dipoles?
1. A Review of General Chemistry
Electronegativity
5:33 minutesProblem 29
Textbook Question
For each compound, state whether its bonding is covalent, ionic, or a mixture of covalent and ionic.
a. NaCl
b. NaOH
c. CH3Li
d. CH2Cl2
e. NaOCH3
f. HCO2Na
g. CF4
Verified step by step guidance1
Identify the types of elements involved in each compound. Generally, compounds formed between metals and nonmetals are ionic, while those formed between nonmetals are covalent.
For NaCl, recognize that it consists of a metal (Na) and a nonmetal (Cl), indicating ionic bonding.
For NaOH, note that it contains a metal (Na) and a polyatomic ion (OH). The bond between Na and OH is ionic, while the bond within OH is covalent.
For CH3Li, observe that it contains a metal (Li) and a nonmetal (C). This suggests a mixture of covalent (C-H bonds) and ionic (C-Li bond) bonding.
For CH2Cl2, recognize that it consists entirely of nonmetals (C, H, Cl), indicating covalent bonding.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Covalent Bonding
Covalent bonding occurs when two atoms share one or more pairs of electrons, typically between nonmetals. This type of bond is characterized by the mutual sharing of electrons to achieve a full outer shell, resulting in the formation of molecules. Examples include the bonds in CH2Cl2 and CF4, where carbon shares electrons with hydrogen, chlorine, or fluorine.
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Ionic Bonding
Ionic bonding involves the transfer of electrons from one atom to another, leading to the formation of charged ions. This bond typically occurs between metals and nonmetals, where the metal loses electrons to become a cation, and the nonmetal gains electrons to become an anion. NaCl is a classic example, where sodium donates an electron to chlorine.
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Mixed Bonding (Covalent and Ionic)
Some compounds exhibit both covalent and ionic characteristics, often involving polyatomic ions. In such cases, covalent bonds exist within the polyatomic ion, while ionic bonds form between the ion and other atoms. For instance, in NaOH, the OH group is covalently bonded, while the bond between Na and OH is ionic.
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