AnswersRoy Summer School 26 Physical ScienceNaming Ionic Compounds

Naming Covalent Compounds Answers

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1
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Which best describes ionic compound formulas?

A
They have more positive charges than negative.
B
They have more negative charges than positive.
C
They have an equal number of positive and negative charges.
D
They have an unbalanced chemical formula.
2
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Sarah is asked to sort out the list of ions and ionic compounds. How can Sarah differentiate between the ions and ionic compounds?

A
Ions have a positive or negative charge, but an ionic compound’s overall charge is zero.
B
Ions have no charge, but ionic compounds have a positive charge.
C
Ions have no charge, but ionic compounds have a negative charge.
D
Ions have a positive or negative charge, but an ionic compound’s overall charge is negative.
3

Which is a valid ionic compound?

A
sodide chlorine
B
sodium chlorine
C
sodium chloride
D
sodide chloride
4

Zinc has a charge of +2, and oxygen has a charge of –2. Which is the chemical formula for zinc oxide?

A
ZnO
B
Zn2O
C
OZn
D
OZn2
5

Beryllium has a charge of +2, and bromine has a charge of –1. Which is the best name for the ionic bond that forms between them?

A
beryllium bromide
B
beryllium bromine
C
bromine berylliumide
D
bromide berylliumide
6

Which is an unnecessary rule for writing chemical formulas?

A
identify the positive ion and charge
B
balance the charges
C
write the negative ion first
D
identify the negative ion and charge
7

A list of different ions is shown. Which combination of ions will result in an ionic bond?Na+Li+O2–S2–F–

A
SO
B
NaF
C
NaO2
D
LiNa
8

The chemical formula for lithium phosphide is Li3P. Which best describes this ionic compound?

A
Lithium ions have 1 positive charge, and phosphorus ions have 3 negative charges.
B
Lithium ions have 3 positive charges, and phosphorus ions have 1 negative charge.
C
Lithium ions have 1 negative charge, and phosphorus ions have 3 positive charges.
D
Lithium ions have 3 negative charges, and phosphorus ions have 1 positive charge.
9

Potassium (K) has a charge of +1, and sulfur has a charge of –2. Which best describes the compound they make?

A
The chemical formula is K2S, and the name is potassium sulfide.
B
The chemical formula is KS2, and the name is potassium sulfide.
C
The chemical formula is K2S, and the name is sulfur potassium.
D
The chemical formula is KS2, and the name is sulfur potassium.
10

The charges for four ions are sodium (Na) +1, calcium (Ca) +2, fluorine (F) –1, and sulfur (S) –2. Which would be an ionic bond that could form from any of these ions?

A
NaCa2
B
Na2S
C
CaF
D
FS

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