Multiple Choice
Which of the following molecules contains two nitrogen atoms and is highly soluble in water?
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3. Chemical Reactions
Molecular Formula
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Which of the following compounds consists of molecules?
A
KBr
B
NaCl
C
MgO
D
CO_2
Verified step by step guidance1
Understand the difference between ionic compounds and molecular compounds. Ionic compounds are composed of ions held together by ionic bonds, forming a lattice structure, while molecular compounds consist of discrete molecules held together by covalent bonds.
Identify the nature of each compound given: KBr, NaCl, and MgO are all composed of metal and nonmetal elements, which typically form ionic bonds resulting in ionic compounds.
Recognize that CO_2 (carbon dioxide) is composed of nonmetal atoms bonded covalently, forming distinct molecules rather than an extended ionic lattice.
Conclude that KBr, NaCl, and MgO are ionic compounds and do not consist of molecules, whereas CO_2 is a molecular compound consisting of individual molecules.
Therefore, the compound that consists of molecules among the options is CO_2.
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