AnswersCR Chemistry S1 Q3050OXCovalent Bonding

Covalent Bonding Answers

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1
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Which element has the greatest number of valence electrons available for bonding?

A
selenium
B
boron
C
calcium
D
chlorine
2
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Which pair of elements will form a covalent bond?

A
hydrogen and chlorine
B
sodium and chlorine
C
copper and bromine
D
zinc and bromine
3

Which statement about covalent compounds is true?

A
They are able to melt at high temperatures.
B
They are poor conductors of heat.
C
They have strong intermolecular attractions.
D
They have atomic bonds that are easy to break.
4

What is the best reason for the difference in properties of LiCl and C6H14O?

A
LiCl and C6H14O have different atomic masses.
B
Cl and O belong to different groups of the periodic table.
C
One compound is ionic, and the other is metallic.
D
One compound is covalent, and the other is ionic.
5

Which compound is an exception to the octet rule?

A
H2O
B
HCl
C
CCl4
D
ClF3
6

Which type of bond will form between two chlorine atoms?

A
an ionic bond
B
a metallic bond
C
a polar covalent bond
D
a nonpolar covalent bond
7

How many valence electrons are available for bonding in silicon?

A
four
B
five
C
eight
D
fourteen
8

Which structure shows the correct electron arrangement in CCl4?

A
A central upper C is single bonded to upper H above, below, and to the left, and single-bonded to upper C l to the right. The C l has three pairs of electron dots, above, right, and below.
Option A
B
A central upper C is single bonded to upper C l to the top, bottom, and left; those upper C l atoms have three pairs of electron dots on the sides away from the bond. The C is also single bonded to an upper H to the right.
Option B
C
A central upper C is single bonded to upper H above and below, and to upper C l to the left and right. The C l have three pairs of dots, above, below, and to the side opposite the bond.
Option C
D
A central upper C is single bonded to upper C l above, right, left, and below. All the C l atoms have 3 pair of electron dots, on the three sides that do not have the bond.
Option D
9

Which compound contains only a nonpolar covalent molecule?

A
O2
B
HCl
C
H2O
D
NO3
10

Which statement about covalent compounds is true?

A
They are able to melt at high temperatures.
B
They are poor conductors of heat.
C
They have strong intermolecular attractions.
D
They have atomic bonds that are easy to break.
11

Which element has the fewest valence electrons available for bonding?

A
iodine
B
aluminum
C
carbon
D
nitrogen
12

How many valence electrons are available for bonding in bromine (Br)?

A
one
B
two
C
five
D
seven
13

Some atoms are exceptions to the octet rule by having an expanded octet. Which characteristic is needed for an atom to have an expanded octet?

A
The atom has empty d-orbitals.
B
The atom has more than eight valence electrons before bonding.
C
The atom has empty p-orbitals.
D
The atom has fewer than eight valence electrons after bonding.

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