AnswersNC-Physical Science CR 2024Metallic Bonds

Metallic Bonds — Unit test Answers

19 verified answers
1
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Which is a characteristic of all ions?

A
They are metals.
B
They have a charge.
C
They are made of two or more types of atoms.
D
They form chemical bonds through electron sharing.
2
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To what extent do covalent compounds conduct electricity?

A
always
B
usually
C
rarely
D
never
3

"Na2SO3” represents sodium sulfite.What does the 4 mean in the formula 4Na2SO3?

A
There are four atoms of sodium.
B
There are four atoms of sodium sulfite.
C
There are four molecules of sodium sulfite.
D
There are four elements in sodium sulfite.
4

There are several different models that represent compounds. One type of model is shown.

Question illustration
A
a structural formula
B
a chemical formula
C
a space-filling model
D
a ball-and-stick model
5

Which ionic compound is used as a building material?

A
salt
B
limestone
C
magnesium oxide
D
iron oxide
6

Which is a characteristic of all ions?

A
They are metals.
B
They have a charge.
C
They are made of two or more types of atoms.
D
They form chemical bonds through electron sharing.
7

There are several different models that represent compounds. One type of model is shown.

Question illustration
A
a structural formula
B
a chemical formula
C
a space-filling model
D
a ball-and-stick model
8

What best explains whether bromine (Br) or neon (Ne) is more likely to form a covalent bond?

Question illustration
A
Bromine forms covalent bonds because it has seven valence electrons, but neon has eight valence electrons and already fulfills the octet rule.
B
Bromine forms covalent bonds because it has many electron shells, but neon has only two electron shells and is tightly bound to its electrons.
C
Neon forms covalent bonds because it can share its valence electrons, but bromine has seven valence electrons and can gain only one more electron.
D
Neon forms covalent bonds because it has only two electron shells, but bromine has many electron shells and will lose electrons in order to fulfill the octet rule.
9

The table describes the properties of four compounds.Which compounds are most likely ionic?

Question illustration
A
compounds A and B
B
compounds B and C
C
compounds C and D
D
compounds D and A
10

How many atoms of each element are in the chemical formula Ca(OH)2?

A
1 calcium, 1 oxygen, and 1 hydrogen
B
1 calcium, 2 oxygen, and 2 hydrogen
C
2 calcium, 1 oxygen, and 2 hydrogen
D
2 calcium, 2 oxygen, and 2 hydrogen
11

Shameeka is studying for an exam. She took the notes below about calcium and chlorine, which are known to form ionic bonds.Calcium, which is a metal, donates 2 electrons to chlorine.The individual calcium atoms become ions with a negative 2 charge. The bond between calcium and chlorine makes the atoms stable. Calcium and chlorine attract each other. Which best describes Shameeka’s error?

A
Calcium is a metal, so it donates protons, not electrons.
B
The individual calcium atom has a positive, not negative, 2 charge.
C
The bond formed makes the atoms unstable, not stable.
D
Calcium and chlorine repel, not attract, each other.
12

Jamal plugged his radio into the wall. The radio’s plug had copper wires surrounded by rubber.What does the rubber protect Jamal from?

A
conduction
B
malleability
C
light
D
bonding
13

Which describes the substances that form covalent bonds?

A
a metal and a metalloid
B
a metal and a nonmetal
C
two nonmetals
D
two metals
14

Which ionic compound is used as a building material?

A
salt
B
limestone
C
magnesium oxide
D
iron oxide
15

How many atoms of each element are in the chemical formula Ca(OH)2?

A
1 calcium, 1 oxygen, and 1 hydrogen
B
1 calcium, 2 oxygen, and 2 hydrogen
C
2 calcium, 1 oxygen, and 2 hydrogen
D
2 calcium, 2 oxygen, and 2 hydrogen
16

Calcium carbonate (CaCO3) is a white solid with no odor. When CaCO3 is heated, the resulting substances are calcium oxide (CaO) and carbon dioxide (CO2). CaO is a white to gray solid with no odor, and CO2 is a gas with no odor and color.Which statement describes CaCO3?

A
It is a diatomic molecule that can’t be broken down by physical means.
B
It is a diatomic molecule that can’t be broken down by chemical means.
C
It is a compound that can be broken down by physical means.
D
It is a compound that can be broken down by chemical means.
17

Alice added sodium chloride to water and stirred the water for several minutes. Alice is most likely trying to demonstrate that ionic compounds

A
are hard.
B
can dissolve.
C
are clear.
D
can melt.
18

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

Question illustration
A
two
B
three
C
six
D
seven
19

Cobalt is a metal. Which best describes the cobalt atom and its interactions with other cobalt atoms?

A
The valence electrons are weakly attracted to the protons and move amongst the atoms.
B
The valence electrons are strongly attracted to the protons and stay in the same place.
C
The nuclear protons are strongly attracted to the neutrons and move amongst the atoms.
D
The nuclear protons are weakly attracted to the neutrons and stay in the same place.
20

Metallic bonds are important to how paperclips are both made and used.

Question illustration
A
Conduction is important for making paperclips, and shininess is important for using them.
B
Shininess is important for making paperclips, and ductility is important for using them.
C
Ductility is important for making paperclips, and malleability is important for using them.
D
Malleability is important for making paperclips, and conduction is important for using them.

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