Question 1

Ammonium fluoride is considered which of the following?

Accepted Answer

A)  atomic element
B)  molecular element
C)  molecular compound
D)  ionic compound
E)  none of the above

Question 2

What is correct name of the compound whose formula is N2O4?

Accepted Answer

A)  nitrogen dioxide
B)  nitrogen tetroxide
C)  dinitrogen oxide
D)  dinitrogen tetroxide
E)  none of the above

Question 3

The subscripts in a chemical formula represent the relative mass of each atom in a chemical compound.

Accepted Answer

A) True 
 B)False

Question 4

What is the correct formula for the hypochlorite polyatomic ion?

Accepted Answer

A)  ClO-
B)  ClO2-
C)  ClO3-
D)  ClO4-
E)  none of the above

Question 5

What is the name of HI (aq) ?

Accepted Answer

A)  hydroiodous acid
B)  hydroiodic acid
C)  iodic acid
D)  iodous acid
E)  none of the above

Question 6

What is the name of Ca(NO3) 2?

Accepted Answer

A)  calcium dinitrite
B)  calcium nitrate
C)  calcium nitride
D)  calcium nitrite
E)  none of the above

Question 7

What is the correct formula of a compound that has ten oxygen atoms and four phosphorus atoms?

Accepted Answer

A)  O10P4
B)  10OP4
C)  4PO10
D)  P4O10
E)  none of the above

Question 8

What is the correct formula for the molecular compound heptaphosphorus octafluoride?

Accepted Answer

A)  P5F8
B)  P 7F6
C)  P6F7
D)  P7F8
E)  none of the above

Question 9

What is the correct formula for potassium dichromate?

Accepted Answer

A)  K(CrO4) 2
B)  KCr2O7
C)  K2CrO4
D)  K2Cr2O7
E)  none of the above

Question 10

Which metal atom below cannot form a cation of several different charges?

Accepted Answer

A)  Cr
B)  Mn
C)  Fe
D)  Ba
E)  none of the above

Question 11

The subscripts in a chemical formula do not change for a given compound.

Accepted Answer

A) True 
 B)False

Question 12

What is the oxygen-to-sulfur mass ratio of sulfur dioxide?

Accepted Answer

A)  0.5
B)  1.0
C)  2.0
D)  16
E)  none of the above

Question 13

Which of the following species is a molecular element?

Accepted Answer

A)  neon
B)  sodium
C)  chlorine
D)  carbon dioxide
E)  none of the above

Question 14

Which among the following elements does NOT exist as a diatomic molecule in nature?

Accepted Answer

A)  hydrogen
B)  nitrogen
C)  fluorine
D)  neon
E)  none of the above

Question 15

Carbon is considered which of the following?

Accepted Answer

A)  atomic element
B)  molecular element
C)  molecular compound
D)  ionic compound
E)  none of the above

Question 16

Which of the following has the largest formula mass?

Accepted Answer

A)  CO2
B)  SO2
C)  NO2
D)  SiO2
E)  H2O

Question 17

Chemical formulas normally list the most metallic elements first.

Accepted Answer

A) True 
 B)False

Question 18

The first chemist to formally state the law of constant composition was:

Accepted Answer

A)  Dalton.
B)  Mendeleev.
C)  Rutherford.
D)  Proust.
E)  none of the above

Question 19

The formula of a compound comprised of two nitrogen atoms and one oxygen atom should be written properly as ON2.

Accepted Answer

A) True 
 B)False

Question 20

A student wrote the formula for the compound aluminum phosphate as AlPO4 .What is wrong with this formula?

Accepted Answer

A)  The compound is not charge-neutral.
B)  Aluminum is a nonmetal so it cannot form an ionic compound.
C)  The formula should be Al(PO4) .
D)  There cannot be three different atom types in a chemical formula.
E)  Nothing is wrong with the formula.

Exam 5: Molecules and Compounds

A student wrote the formula for the compound aluminum phosphate as AlPO4 .What is wrong with this formula?

Correct AnswerverifiedShow Answer

What is the correct formula for the molecular compound heptaphosphorus octafluoride?

Correct AnswerverifiedShow Answer

Which of the following has the largest formula mass?

Correct AnswerverifiedShow Answer

Which among the following elements does NOT exist as a diatomic molecule in nature?

Correct AnswerverifiedShow Answer

Which metal atom below cannot form a cation of several different charges?

Correct AnswerverifiedShow Answer

What is the name of Ca(NO3) 2?

Correct AnswerverifiedShow Answer

The subscripts in a chemical formula do not change for a given compound.

Correct AnswerverifiedShow Answer

What is the correct formula for potassium dichromate?

Correct AnswerverifiedShow Answer

What is the correct formula for the hypochlorite polyatomic ion?

Correct AnswerverifiedShow Answer

Chemical formulas normally list the most metallic elements first.

Correct AnswerverifiedShow Answer

What is the correct formula of a compound that has ten oxygen atoms and four phosphorus atoms?

Correct AnswerverifiedShow Answer

Ammonium fluoride is considered which of the following?

Correct AnswerverifiedShow Answer

What is the name of HI (aq) ?

Correct AnswerverifiedShow Answer

The subscripts in a chemical formula represent the relative mass of each atom in a chemical compound.

Correct AnswerverifiedShow Answer

What is correct name of the compound whose formula is N2O4?

Correct AnswerverifiedShow Answer

Carbon is considered which of the following?

Correct AnswerverifiedShow Answer

The formula of a compound comprised of two nitrogen atoms and one oxygen atom should be written properly as ON2.

Correct AnswerverifiedShow Answer

Which of the following species is a molecular element?

Correct AnswerverifiedShow Answer

What is the oxygen-to-sulfur mass ratio of sulfur dioxide?

Correct AnswerverifiedShow Answer

The first chemist to formally state the law of constant composition was:

Correct AnswerverifiedShow Answer

A student wrote the formula for the compound aluminum phosphate as AlPO₄ .What is wrong with this formula?

Correct Answer
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What is the name of Ca(NO₃) ₂?

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What is correct name of the compound whose formula is N₂O₄?

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The formula of a compound comprised of two nitrogen atoms and one oxygen atom should be written properly as ON₂.

Correct Answer
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