Answers26-27 CFISD TX-Chemistry A CRCovalent Bonding

Lab: Ionic and Covalent Bonds Answers

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1
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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
2
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Which statement describes a property of covalent compounds?

A
They have a high boiling point because of strong intermolecular forces.
B
They have a low boiling point because of weak intermolecular forces.
C
They have a low melting point because of strong intermolecular forces.
D
They have a high melting point because of weak intermolecular forces.
3

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

A
one
B
two
C
five
D
seven
4

Which characteristic best explains the difference in melting behavior of covalent substances and ionic substances?

A
Ionic substances have weaker intermolecular attractions.
B
Ionic substances usually have stronger atomic bonds.
C
Covalent substances have weaker intermolecular attractions.
D
Covalent substances usually have stronger atomic bonds.
5

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.
6

How many valence electrons are available for bonding in silicon?

A
four
B
five
C
eight
D
fourteen
7

Which compound is an exception to the octet rule?

A
H2O
B
HCl
C
CCl4
D
ClF3
8

Which compound contains only a nonpolar covalent molecule?

A
O2
B
HCl
C
H2O
D
NO3
9

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

A
selenium
B
boron
C
calcium
D
chlorine
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.

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