4. Consider the images labelled A - D below. Which of these shows a sigma (a) interaction between two hybridized atomic orbitals? a. A b. D c. C B 88 C d. A & B D e. A & D
Formal Charges
Formal charges have an important role in organic chemistry since this concept helps us to know whether an atom in a molecule is neutral/bears a positive or negative charge. Even if some molecules are neutral, the atoms within that molecule need not be neutral atoms.
Polarity Of Water
In simple chemical terms, polarity refers to the separation of charges in a chemical species leading into formation of two polar ends which are positively charged end and negatively charged end. Polarity in any molecule occurs due to the differences in the electronegativities of the bonded atoms. Water, as we all know has two hydrogen atoms bonded to an oxygen atom. As oxygen is more electronegative than hydrogen thus, there exists polarity in the bonds which is why water is known as a polar solvent.
Valence Bond Theory Vbt
Valence bond theory (VBT) in simple terms explains how individual atomic orbitals with an unpaired electron each, come close to each other and overlap to form a molecular orbital giving a covalent bond. It gives a quantum mechanical approach to the formation of covalent bonds with the help of wavefunctions using attractive and repulsive energies when two atoms are brought from infinity to their internuclear distance.
![4.
5.
6.
7.
8.
Consider the images labelled A - D below. Which of these shows a sigma (o) interaction between two hybridized
atomic orbitals?
For questions 5-7 consider the following molecules:
1 CHẠO
2 H₂O
3 BF,
4 CO₂
Which of these molecules have a tetrahedral electron domain geometry?
a. 1, 2, and 3
b. 2, 5, and 6
c. 2 and 4
9.
a. A
Which of these molecules have a non-zero dipole moment?
a. only 1
b. 1, 2, 4, and 5
a. 1 and 3
b. D
Which of these molecules have at least one bond angle of 120°?
c. 1, 3, and 5
a.
b.
c. C
C.
Which one of the following is an allowed set of quantum numbers?
a. n = 2, f = 1, m, = +½, m, = -
c. n= 3, f = 2, m, = +1 m, = +1
e. n = 4, l = 4, m, = -1, m, = +
d.
B
b. 3 and 4
e.
c. 1, 2, and 5
d. A & B
5 SBT4
b. n = 4,
d. n = 5,
6 CCl4
d. only 6
Which one of the following statements is false?
Ionization energy describes an endothermic change for all elements.
A 1st ionization energy can be represented by the following equation: M (g) → M* (g) + e.
For any element, the second ionization energy is larger than the first ionization energy.
Ionization energy increases from left to right across a period of the periodic table.
Ionization energy increases from top to bottom down a group of the periodic table.
d. 3 and 6
C
X = 2.5
10. Consider the following elements and their given Pauling electronegativity values:
H
F
X = 2.1
X = 4.0
Which one of the following statements is true?
a. A C-S bond is best described as a nonpolar covalent bond.
c. C-F and C-H bonds have approximately the same polarity.
e. In a C-Cl bond, chlorine has a partial positive charge (8+).
d. 2 and 3
= 2, m, = -2, m, = -½
= 2, m, = +2, m, =-1
Taidho v
CI
X = 3.0
S
X = 2.5
D
e. A & D
e. 2 and 6
e. 4 and 5
e. 3 and 6
SA
b. H-Cl may be classified as an ionic compound.
d. A C-S bond does not result from shared e-'s.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fee870430-32a2-499a-9e83-c784fd8c6eea%2F08db8019-b0b6-4210-bcf2-66f815d72546%2Fpo8gua8_processed.jpeg&w=3840&q=75)
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