AnswersPhysical ScienceChemical Bonding and Compounds

Chemical Bonding and Compounds — Test Answers

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3

Which describes the substances that form covalent bonds?

A
two nonmetals
B
a metal and a nonmetal
C
a metal and a metalloid
D
two metals
4

What is necessary for a metallic bond to form?

A
The atoms should be in close proximity.
B
The electrons must be attracted to each other.
C
The nuclei must contain neutrons.
D
The atoms should be far apart.
5

Which ionic compound is used as a building material?

A
limestone
B
salt
C
magnesium oxide
D
iron oxide
7

Which statement describes a characteristic of most metals?

A
They are poor conductors.
B
They can be formed into wires.
C
They are liquid at room temperature.
D
They cannot be shaped by hammering or pounding.
9

Which is a characteristic of all ions?

A
They form chemical bonds through electron sharing.
B
They are metals.
C
They have a charge.
D
They are made of two or more types of atoms.
10

What does the octet rule state that explains why atoms bond?

A
An atom bonds to have eight valence electrons to become stable.
B
An atom bonds to lose eight valence electrons to become unstable.
C
An atom bonds to lose eight valence electrons to become stable.
D
An atom bonds to have eight valence electrons to become unstable.
13

Calcium carbonate open paren CaCO sub 3 close paren is a white solid with no odor. When CaCO sub 3 is heated, the resulting substances are calcium oxide CaO and carbon dioxide open paren CO sub 2 close paren CaO is a white to gray solid with no odor, and CO sub 2 is a gas with no odor and color. Which statement describes CaCO sub 3 ?

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

" Na sub 2 SO sub 3 ” represents sodium sulfite. What does the 4 mean in the formula 4 Na sub 2 SO sub 3 ?

A
There are four atoms of sodium sulfite.
B
There are four elements in sodium sulfite.
C
There are four atoms of sodium.
D
There are four molecules of sodium sulfite.
18

Which is a limitation of using cellulose?

A
its high cost to recycle
B
its lack of biodegradability
C
its harm to landfills
D
its lack of mass production
20

What type of model is shown?

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

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