AnswersTX-Integrated Physics and ChemistryLab: Physical and Chemical Changes

Covalent Bonds Answers

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The compound cyanogen (CN)2 has covalent bonds shown in this diagram.

Question illustration
A
two
B
three
C
six
D
seven
2
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For a science fair project about food and chemistry, Bill looks around his kitchen for examples of covalent compounds. What evidence can Bill use in his project to show that water (H2O) acts like other covalent compounds?

A
He can demonstrate that water is a liquid with a definite volume.
B
He can demonstrate that water can be boiled on a simple kitchen stove.
C
He can demonstrate that water can sometimes be used to conduct electricity.
D
He can demonstrate that water can change shape and either be sprayed or poured.
3

Which is most likely a covalent compound?

A
NaCl
B
KCl
C
CuF2
D
CF4
4

After a covalent bond has stabilized an atom, the atom will have

A
fewer valence electron shells.
B
more valence electron shells.
C
an empty valence electron shell.
D
a full valence electron shell.
5

Covalent bonds can be best described as

A
neutral atoms coming together to share electrons.
B
neutral atoms coming together to create electrons.
C
ionized atoms coming together to trade electrons.
D
ionized atoms coming together to destroy electrons.
6

In carbon dioxide (CO2), there are two oxygen atoms for each carbon atom. Each oxygen atom forms a double bond with carbon, so the molecule contains two sets of double bonds.Two sets of double bonds means that the total number of electrons being shared in the molecule is

A
two.
B
four.
C
six.
D
eight.
7

Phosphorous (P) and chlorine (Cl) bond covalently to form the important industrial compound phosphorous trichloride. The diagrams below show the electron structures of phosphorous and chlorine.Which diagram shows how the covalent bonds most likely form in a phosphorous trichloride molecule?

Question illustration
A
Option
B
Option
C
Option
D
Option
8

Which diagram represents an element that is likely to form covalent bonds?

A
Option
B
Option
C
Option
D
Option
9

Which best describes most covalent compounds?

A
resilient
B
brittle
C
cold
D
warm
10

What best explains how two oxygen atoms, each with six valence electrons, can bond with each other?

A
One atom can lose two electrons so that the other atom can gain them and have eight valence electrons.
B
One atom can lose four electrons to the environment so that a total of eight valence electrons remains.
C
Each atom can share two electrons with the other so that each atom has eight valence electrons.
D
Each atom can lose two electrons so that there is a total of eight valence electrons between the atoms.

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