Hydrogen Bonds

The electrical attraction between the hydrogen atom in a polar bond in one molecule and an oxygen or nitrogen atom in a polar bond of another molecule—or within the same molecule if the bonds are sufficiently separated from each other—forms a hydrogen bond. This type of bond is very weak, having only about 4 percent of the strength of the polar bonds linking the

Vander et al.: Human I I. Basic Cell Functions I 2. Chemical Composition of I I © The McGraw-Hill

Physiology: The the Body Companies, 2001

Mechanism of Body Function, Eighth Edition

Chemical Composition of the Body CHAPTER TWO

TABLE 2-3 Most Frequently Encountered Ionic Forms of Elements

Chemical

Chemical

Electrons

Atom

Symbol

Ion

Symbol

Gained or Lost

Hydrogen

H

Hydrogen ion

H+

1 lost

Sodium

Na

Sodium ion

Na+

1 lost

Potassium

K

Potassium ion

K+

1 lost

Chlorine

Cl

Chloride ion

Cl-

1 gained

Magnesium

Mg

Magnesium ion

Mg2+

2 lost

Calcium

Ca

Calcium ion

Ca2+

2 lost

TABLE 2-4 Examples of Nonpolar and Polar Bonds, and Ionized Chemical Groups

1

Carbon-hydrogen bond

Nonpolar Bonds

I I

1 1 —C—C— 1 1

Carbon-carbon bond

(-) (+) R-O-H

Hydroxyl group (R—OH)

Polar Bonds

(-) (+) R-S-H

Sulfhydryl group (R—SH)

R-N-R

Nitrogen-hydrogen bond

R-C-O-

Carboxyl group (R—COO-)

O

Amino group (R—NH3+)

O-

Phosphate group (R—PO42-)

hydrogen and oxygen within a water molecule (H2O). Hydrogen bonds are represented in diagrams by dashed or dotted lines to distinguish them from cova-lent bonds (Figure 2-4). Hydrogen bonds between and within molecules play an important role in molecular interactions and in determining the shape of large molecules.

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  • feorie
    What are hydrogen Bonds in the Body?
    7 years ago

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