AnswersNC-Physical Science CR 2024Metallic Bonds

Metallic Bonds — Unit test Answers

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21
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Which product relies on the ability of ionic compounds to conduct electricity?

A
paper
B
batteries
C
soap
D
glazed pottery
22
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Anjuli is looking at four different metal samples on the counter. Three are solid, and one is a liquid. Which statement about the liquid metal is most likely true?

A
The liquid metal is gold.
B
The liquid metal is mercury.
C
The liquid metal was superheated.
D
The liquid metal was supercooled.
23

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.
24

Which product relies on the ability of ionic compounds to conduct electricity?

A
paper
B
batteries
C
soap
D
glazed pottery
25

Nickel and gold combine to make white gold. Which best dscribes white gold?

A
alloy of nickel and gold
B
element of nickel and gold
C
atom of nickel and gold
D
pure metal of nickel and gold
26

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.
27

Because of metallic bonding, when light is pointed at metals, they become

A
shiny.
B
malleable.
C
ductile.
D
conductive.
28

Which is most likely a covalent compound?

A
LiF
B
MgS
C
NH3
D
CaCl2
29

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
30

Question text not available

Question illustration
A
A and B
B
C and D
C
A
D
C
31

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.
32

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.
33

To what extent do covalent compounds conduct electricity?

A
always
B
usually
C
rarely
D
never
34

What is necessary for a metallic bond to form?

A
The atoms should be in close proximity.
B
The atoms should be far apart.
C
The electrons must be attracted to each other.
D
The nuclei must contain neutrons.
35

Which is most likely a covalent compound?

A
LiF
B
MgS
C
NH3
D
CaCl2
36

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
37

"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.
38

The electrons between atoms in metallic bonds

A
allow for bonding metals to be reactive.
B
allow for bonding metals to be stable.
C
are stationary and provide durability to the metal.
D
are attracted to the neutrons of the metal.
39

Two models of the same compound are shown.

Question illustration
A
Model B shows the types of elements in the compound, but Model A does not.
B
Model B shows the three-dimensional shape of the molecule, but Model A does not.
C
Model B shows how the atoms in the molecule are connected, but Model A does not.
D
Model B shows the number of atoms of each element in the molecule, but Model A does not.
40

Which statement describes a characteristic of most metals?

A
They can be formed into wires.
B
They cannot be shaped by hammering or pounding.
C
They are liquid at room temperature.
D
They are poor conductors.

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