The elements that are likely to form basic oxides, acidic oxides and amphoteric oxide have to be determined. Concept Introduction: According to physical and chemical properties, the elements can be divided into metals, non-metals and metalloids. In a group, the metallic character of an element increases from top to bottom whereas in a period, it decreases from left to right. The classification elements in the periodic table as metals, nonmetals, or metalloids can be given as Oxide is the compound formed when oxygen reacts with another element. Oxides formed with metals are basic. Oxides formed with metals are most probably basic. Most of oxides formed with nonmetals are acidic. Amphoteric oxides have the properties of bases and acid. Elements that are in the intermediate position of periodic table form amphoteric oxide.
The elements that are likely to form basic oxides, acidic oxides and amphoteric oxide have to be determined. Concept Introduction: According to physical and chemical properties, the elements can be divided into metals, non-metals and metalloids. In a group, the metallic character of an element increases from top to bottom whereas in a period, it decreases from left to right. The classification elements in the periodic table as metals, nonmetals, or metalloids can be given as Oxide is the compound formed when oxygen reacts with another element. Oxides formed with metals are basic. Oxides formed with metals are most probably basic. Most of oxides formed with nonmetals are acidic. Amphoteric oxides have the properties of bases and acid. Elements that are in the intermediate position of periodic table form amphoteric oxide.
21.38 Arrange the molecules in each set in order of increasing acidity (from least acidic to
most acidic).
OH
OH
SH
NH2
8
NH3
OH
(b)
OH
OH
OH
(c)
& & &
CH3
NO2
21.39 Explain the trends in the acidity of phenol and the monofluoro derivatives of phenol.
OH
OH
OH
OH
PK 10.0
PK 8.81
PK 9.28
PK 9.81
identify which spectrum is for acetaminophen and which is for phenacetin
The Concept of Aromaticity
21.15 State the number of 2p orbital electrons in each molecule or ion.
(a)
(b)
(e)
(f)
(c)
(d)
(h)
(i)
DA
(k)
21.16 Which of the molecules and ions given in Problem 21.15 are aromatic according to the
Hückel criteria? Which, if planar, would be antiaromatic?
21.17 Which of the following structures are considered aromatic according to the Hückel
criteria?
---0-0
(a)
(b)
(c)
(d)
(e)
(h)
H
-H
.8.0-
21.18 Which of the molecules and ions from Problem 21.17 have electrons donated by a
heteroatom?
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell