Metallic Bonds Answers

1

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The element carbon (C) is most likely to form covalent bonds with the element

A

beryllium (Be).

B

krypton (Kr).

C

selenium (Se).

D

sodium (Na).

2

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Which is most likely a covalent compound?

A

NaCl

B

KCl

C

CuF2

D

CF4

3

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?

A

Option

B

Option

C

Option

D

Option

4

Which element can join with other elements to form covalent bonds?

A

beryllium (Be)

B

carbon (C)

C

cesium (Cs)

D

iron (Fe)

5

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

A

two

B

three

C

six

D

seven

6

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.

7

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.

8

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.

9

A candle’s wick is the fabric string that holds the flame, and it burns down at a constant slow pace when the candle is lit. The wick is usually surrounded by wax.Which is the most important property of covalent compounds that makes them useful for making candle wax?

A

a low boiling point

B

a low melting point

C

a high boiling point

D

a high melting point

10

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.

11

6912

A

6

B

9

C

12

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.

13

Why can a hydrogen atom form a covalent bond without fulfilling the octet rule?

A

Hydrogen’s valence shell can hold only up to two electrons.

B

Hydrogen’s valence shell never needs to be full to be stable.

C

The octet rule only applies to bonds formed by trading electrons.

D

The octet rule only applies to alkali metals and alkaline earth metals.

14

369

A

3

B

6

C

9

15

A candle’s wick is the fabric string that holds the flame, and it burns down at a constant slow pace when the candle is lit. The wick is usually surrounded by wax.Which is the most important property of covalent compounds that makes them useful for making candle wax?

A

a low boiling point

B

a low melting point

C

a high boiling point

D

a high melting point

16

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.

17

Which best describes most covalent compounds?

A

resilient

B

brittle

C

cold

D

warm

18

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

A

two

B

three

C

six

D

seven

19

Which element can join with other elements to form covalent bonds?

A

beryllium (Be)

B

carbon (C)

C

cesium (Cs)

D

iron (Fe)

20

Which is most likely a covalent compound?

A

NaCl

B

KCl

C

CuF2

D

CF4

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