AnswersTN-Physical Science SC 26-27 For CreditNaming Covalent Compounds

Naming Covalent Compounds — Unit test Answers

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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.
2
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When looking at the chemical symbol, the charge of the ion is displayed as the

A
superscript.
B
subscript.
C
coefficient.
D
product.
3

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.
4

Which is most likely a covalent compound?

A
LiF
B
MgS
C
NH3
D
CaCl2
5

Sodium and phosphorus combine to form Na3P. What is the name of this compound?

A
phosphorus sodiate
B
phosphorus sodide
C
sodium phosphate
D
sodium phosphide
6

What prefix should be used for the oxygen atom when naming the chemical formula SO2?

A
mono-
B
pent-
C
di-
D
tri-
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 is used to determine the number of a type of atom in a compound based on the chemical name?

A
the periodic table
B
chemical symbols
C
prefixes
D
the IUPAC
9

"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 formula units of sodium sulfite.
D
There are four elements in sodium sulfite.
10

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.
11

To what extent do covalent compounds conduct electricity?

A
always
B
usually
C
rarely
D
never
12

A __________ at the bottom right side of a chemical symbol represents the number of each type of ion in the chemical formula of an ionic compound.Which best completes the statement?

A
superscript
B
subscript
C
coefficient
D
product
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

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
15

Which refers to the chemical name for NO2?

A
nitrogen dioxygen
B
nitrogen oxide
C
nitrogen dioxide
D
mononitrogen oxygen
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

Calcium has a charge of +2. The chart lists the charges of different ions.

Question illustration
A
CaO, CaMg, or CaF2
B
Ca2Cl, CaNa, or CaP
C
CaF, CaMg, or CaNa
D
CaO, CaF2, or CaCl2
18

When the chemical name of a compound is being written, the subscripts will determine the

A
symbols.
B
elements.
C
prefixes.
D
suffixes.
19

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
20

What is the prefix for oxygen in As2O5?

A
tri-
B
di-
C
mono-
D
penta-

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