Question 1

The charge of a vanadium ion in the compound V2O5 is:

Accepted Answer

A)  5+
B)  2+
C)  10+
D)  10-
E)  none of the aboveF) A) and B)
G) C) and D)

Question 2

Which of the following statements about chemical formulas is FALSE?

Accepted Answer

A)  The subscripts represent the relative number of each type of atom in the compound.
B)  The subscripts represent the relative mass of each type of atom in the compound.
C)  The subscripts do not change for a given compound.
D)  Different compounds made of the same elements have different subscripts.
E)  All of the statements are true.F) B) and E)
G) A) and D)

Question 3

The proper name for the acid HF is hydrofluoric acid.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following compounds have the smallest formula mass?

Accepted Answer

A)  CO2
B)  SO2
C)  NO2
D)  SiO2
E)  H2OF) A) and E)
G) A) and B)

Question 5

Life could not exist with just 91 elements if they did not combine to form compounds.

Accepted Answer

A) True 
 B)False

Question 6

What is the formula for an ionic compound made of aluminum and oxygen?

Accepted Answer

A)  AlO2
B)  Al2O3
C)  Al3O2
D)  AlO
E)  none of the aboveF) A) and B)
G) D) and E)

Question 7

In ionic compounds the net positive charge always equals the net negative charge.

Accepted Answer

A) True 
 B)False

Question 8

How many total atoms are in the formula Al2(CO3) 3?

Accepted Answer

A)  8
B)  9
C)  12
D)  14
E)  none of the aboveF) A) and B)
G) B) and D)

Question 9

The element nitrogen normally exists in nature as a diatomic molecule.

Accepted Answer

A) True 
 B)False

Question 10

What is the correct formula for a compound that has three oxygen atoms and one sulfur atom?

Accepted Answer

A)  O3S
B)  SO3
C)  3OS
D)  SO3
E)  none of the aboveF) B) and D)
G) C) and D)

Question 11

Choose the pair of names and formulas that do NOT match.

Accepted Answer

A)  copper(I) nitrate: CuNO3
B)  copper(II) nitride: Cu3N2
C)  copper(II) nitrate: Cu(NO3) 2
D)  copper(II) nitrite: Cu(NO2) 2
E)  all of these are correctF) All of the above
G) B) and C)

Question 12

Although some substances we encounter in our routine lives are elements,most occur in the combined state.

Accepted Answer

A) True 
 B)False

Question 13

The formula for potassium chlorate is KClO3.The formula for magnesium chloride is MgCl2.What is the formula for magnesium chlorate?

Accepted Answer

A)  MgClO3
B)  Mg2ClO3
C)  Mg(ClO3) 2
D)  Mg2(ClO3) 3
E)  none of the aboveF) B) and C)
G) A) and E)

Question 14

What is the mass ratio of Na to S in sodium sulfide?

Accepted Answer

A)  7.17
B)  55.06
C)  0.717
D)  1.43
E)  none of the aboveF) B) and C)
G) A) and C)

Question 15

When elements combine to form compounds:

Accepted Answer

A)  their properties are an average of all elements in the compound.
B)  their properties change completely.
C)  their properties do not change.
D)  their properties are completely random.
E)  none of the aboveF) All of the above
G) D) and E)

Question 16

A compound has a formula mass of 61.98 amu and is comprised of atoms of sodium and oxygen in a definite ratio.The name of the compound described here is:

Accepted Answer

A)  sodium monoxide.
B)  disodium oxide.
C)  sodium oxide.
D)  sodium dioxide.
E)  none of the aboveF) A) and C)
G) A) and E)

Question 17

How many O atoms are present in sodium chlorite?

Accepted Answer

A)  2
B)  6
C)  4
D)  1
E)  none of the aboveF) A) and E)
G) A) and B)

Question 18

The phosphorous-to-hydrogen mass ratio is 10.2 for a compound.This ratio could correspond to the compound:

Accepted Answer

A)  PH.
B)  PH2.
C)  PH3.
D)  PH6.
E)  none of the aboveF) C) and D)
G) A) and D)

Question 19

If an oxyacid contains the sulfate oxyanion,then this acid has the name sulfurous acid.

Accepted Answer

A) True 
 B)False

Question 20

How many oxygen atoms are in the formula Al2(CO3) 3?

Accepted Answer

A)  3
B)  9
C)  1
D)  6
E)  none of the aboveF) B) and D)
G) B) and E)

Exam 5: Molecules and Compounds

What is the formula for an ionic compound made of aluminum and oxygen?

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Life could not exist with just 91 elements if they did not combine to form compounds.

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A compound has a formula mass of 61.98 amu and is comprised of atoms of sodium and oxygen in a definite ratio.The name of the compound described here is:

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In ionic compounds the net positive charge always equals the net negative charge.

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How many total atoms are in the formula Al2(CO3) 3?

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How many O atoms are present in sodium chlorite?

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When elements combine to form compounds:

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How many oxygen atoms are in the formula Al2(CO3) 3?

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Although some substances we encounter in our routine lives are elements,most occur in the combined state.

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Which of the following statements about chemical formulas is FALSE?

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The formula for potassium chlorate is KClO3.The formula for magnesium chloride is MgCl2.What is the formula for magnesium chlorate?

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Which of the following compounds have the smallest formula mass?

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What is the correct formula for a compound that has three oxygen atoms and one sulfur atom?

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Choose the pair of names and formulas that do NOT match.

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The charge of a vanadium ion in the compound V2O5 is:

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What is the mass ratio of Na to S in sodium sulfide?

Correct AnswerverifiedShow Answer

The proper name for the acid HF is hydrofluoric acid.

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The phosphorous-to-hydrogen mass ratio is 10.2 for a compound.This ratio could correspond to the compound:

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The element nitrogen normally exists in nature as a diatomic molecule.

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If an oxyacid contains the sulfate oxyanion,then this acid has the name sulfurous acid.

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How many total atoms are in the formula Al₂(CO₃) ₃?

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How many oxygen atoms are in the formula Al₂(CO₃) ₃?

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The formula for potassium chlorate is KClO₃.The formula for magnesium chloride is MgCl₂.What is the formula for magnesium chlorate?

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The charge of a vanadium ion in the compound V₂O₅ is:

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