Multiple Choice
Which two enthalpic factors primarily stabilize DNA in its double-helical form at low temperature?
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11. Bonding & Molecular Structure
Chemical Bonds
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following substances contains ionic bonds?
A
H_2O
B
CH_4
C
NaCl
D
CO_2
Verified step by step guidance1
Understand the difference between ionic and covalent bonds: Ionic bonds form between metals and nonmetals through the transfer of electrons, resulting in charged ions. Covalent bonds form between nonmetals by sharing electrons.
Analyze each substance's composition: H_2O (water) consists of hydrogen and oxygen, both nonmetals, so it has covalent bonds.
CH_4 (methane) consists of carbon and hydrogen, both nonmetals, so it also has covalent bonds.
NaCl (sodium chloride) consists of sodium (a metal) and chlorine (a nonmetal). Sodium donates an electron to chlorine, forming Na^+ and Cl^- ions, which are held together by ionic bonds.
CO_2 (carbon dioxide) consists of carbon and oxygen, both nonmetals, so it has covalent bonds.
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