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Chapter 5 Molecules and Compounds Review

Total questions: 94

Worksheet time: 47mins

Name
Class
Date
1.

When elements combine to form compounds, their properties only change slightly.

a)

True

b)

False

2.

The properties of a compound are an average of the properties of the individual elements.

a)

True

b)

False

3.

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

a)

True

b)

False

4.

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

a)

True

b)

False

5.

The law of constant composition states: All samples of a given compound have the same proportions of their constituent elements.

a)

True

b)

False

6.

The fact that water has an oxygen-to-hydrogen mass ratio of 8.0 illustrates the law of conservation of mass.

a)

True

b)

False

7.

The ratio in a chemical formula is a ratio of atoms, not a ratio of masses.

a)

True

b)

False

8.

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

a)

True

b)

False

9.

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

a)

True

b)

False

10.

Chemical formulas normally list the most metallic elements first.

a)

True

b)

False

11.

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

a)

True

b)

False

12.

Molecular elements do not exist in nature.

a)

True

b)

False

13.

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

a)

True

b)

False

14.

If a chemical reaction produces the molecular element oxygen, the formula of oxygen should be written as O₂.

a)

True

b)

False

15.

Carbon dioxide is an example of a molecular compound.

a)

True

b)

False

16.

The basic unit of an ionic compound is called the formula unit.

a)

True

b)

False

17.

SO2 is an ionic compound.

a)

True

b)

False

18.

Ionic compounds have a net charge of zero.

a)

True

b)

False

19.

Ionic compounds always contain positive and negative ions.

a)

True

b)

False

20.

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

a)

True

b)

False

21.

The ionic compound that forms between aluminum and oxygen is AlO.

a)

True

b)

False

22.

The ionic compound that forms between Mg and O is MgO.

a)

True

b)

False

23.

The correct formula for calcium fluoride is CaF3.

a)

True

b)

False

24.

Ionic compounds are usually made up of a metal and a nonmetal.

a)

True

b)

False

25.

The ionic compound MgO is named manganese oxide.

a)

True

b)

False

26.

The name of KNO3 is potassium nitratide.

a)

True

b)

False

27.

The correct formula for sodium permanganate is NaMgO4.

a)

True

b)

False

28.

Metal cations that form more than one type of ion are usually found in the section of the periodic table known as the transition metals.

a)

True

b)

False

29.

If there are two ions in a series of oxoanions, the one with more oxygen is given the ending "-ite."

a)

True

b)

False

30.

The proper name for SF6 is sulfur tetrafluoride.

a)

True

b)

False

31.

The proper name for the acid HF is hydrofluoric acid.

a)

True

b)

False

32.

The proper name for HI is hydroiodic acid.

a)

True

b)

False

33.

The correct name for HNO3 is hydronitric acid.

a)

True

b)

False

34.

Carbonic acid, H2CO3, contains the carbonate oxyanion.

a)

True

b)

False

35.

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

a)

True

b)

False

36.

The correct name for H2SO3 is sulfurous acid.

a)

True

b)

False

37.

When elements combine to form compounds:

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 above

38.

The law of constant composition states:

a)

Matter cannot be either created or destroyed in a chemical reaction.

b)

The nucleus is a dense region of positive charge that always contains protons and neutrons.

c)

All samples of a given compound have the same proportions of their constituent elements.

d)

All atoms of a given element have a constant composition and are different than atoms of any other element.

e)

none of the above

39.

The oxygen-to-hydrogen mass ratio of water is always 8.0 is an example of what fundamental law?

a)

Law of Constant Composition

b)

Law of Constant Mass Ratio

c)

Law of Conservation of Mass

d)

Law of Constant Whole Number Ratio

e)

none of the above

40.

What is the oxygen-to-hydrogen mass ratio for H2O2?

a)

0.125

b)

4

c)

8

d)

16

e)

none of the above

41.

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

a)

PH

b)

PH2

c)

PH3

d)

PH6

e)

none of the above

42.

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

a)

0.5

b)

1.0

c)

2.0

d)

16

e)

none of the above

43.

Suppose an unknown compound XY has an X-to-Y mass ratio of 4.0. If decomposition of compound XY gives 12.0 grams of X, then how many grams of Y must form?

a)

48.0 grams

b)

12.0 grams

c)

4.0 grams

d)

3.0 grams

e)

none of the above

44.

Which of the following statements about chemical formulas is FALSE?

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.

45.

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

a)

8

b)

9

c)

12

d)

14

e)

none of the above

46.

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

a)

3

b)

9

c)

1

d)

6

e)

none of the above

47.

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

a)

3

b)

9

c)

1

d)

6

e)

none of the above

48.

How many of each type of atoms are there in the formula NH4C2H3O2?

a)

N = 4, H = 7, C = 2, O = 2

b)

N = 1, H = 4, C = 2, O = 2

c)

N = 1, H = 3, C = 2, O = 2

d)

N = 1, H = 7, C = 2, O = 2

e)

none of the above

49.

How many of each type of atom are there in the formula Ca3(PO4)2?

a)

Ca = 3, P = 1, O = 4

b)

Ca = 3, P = 2, O = 4

c)

Ca = 3, P = 2, O = 8

d)

Ca = 3, P = 1, O = 8

e)

none of the above

50.

How many of each type of atom are there in the formula (NH4)2HPO4?

a)

N = 2, H = 9, P = 1, O = 4

b)

N = 1, H = 5, P = 1, O = 4

c)

N = 2, H = 5, P = 1, O = 4

d)

N = 2, H = 8, P = 1, O = 4

e)

none of the above

51.

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

a)

O3S

b)

SO3

c)

3OS

d)

SO3

e)

none of the above

52.

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

a)

O10P4

b)

10OP4

c)

4PO10

d)

P4O10

e)

none of the above

53.

Carbon is considered which of the following?

a)

atomic element

b)

molecular element

c)

molecular compound

d)

ionic compound

e)

none of the above

54.

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

a)

hydrogen

b)

nitrogen

c)

fluorine

d)

neon

e)

none of the above

55.

Carbon monoxide is considered which of the following?

a)

atomic element

b)

molecular element

c)

molecular compound

d)

ionic compound

e)

none of the above

56.

Fluorine is considered which of the following?

a)

atomic element

b)

molecular element

c)

molecular compound

d)

ionic compound

e)

none of the above

57.

Ammonium fluoride is considered which of the following?

a)

atomic element

b)

molecular element

c)

molecular compound

d)

ionic compound

e)

none of the above

58.

Which of the following species is a molecular element?

a)

neon

b)

sodium

c)

chlorine

d)

carbon dioxide

e)

none of the above

59.

Which of the following is a molecular compound?

a)

barium sulfide

b)

calcium acetate

c)

potassium hydroxide

d)

nitrogen monoxide

e)

none of the above

60.

What is the formula for an ionic compound made of barium and nitrogen?

a)

Ba3N2

b)

Ba2N3

c)

BaN

d)

Ba2N4

e)

none of the above

61.

What is the formula for an ionic compound made of magnesium and sulfur?

a)

MgS

b)

MgS2

c)

Mg2S

d)

Mg2S3

e)

none of the above

62.

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

a)

CO2

b)

C2O

c)

CO

d)

CO3

e)

Carbon and oxygen do not form an ionic compound.

63.

The ionic compound that forms between potassium and oxygen is:

a)

K2O.

b)

KO.

c)

KO2.

d)

K2O2.

e)

none of the above

64.

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

a)

AlO2

b)

Al2O3

c)

Al3O2

d)

AlO

e)

none of the above

65.

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

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.

66.

What is the name of the ionic compound made of beryllium and chlorine?

a)

beryllium(II) chloride

b)

beryllium dichloride

c)

beryllium chloride

d)

monoberyllium dichloride

e)

none of the above

67.

What is the name of the compound made from lithium and oxygen?

a)

lithium dioxide

b)

lithium(I) oxide

c)

oxygen lithide

d)

lithium oxide

e)

none of the above

68.

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

a)

Cr

b)

Mn

c)

Fe

d)

Ba

e)

none of the above

69.

What is the name of CoS?

a)

cobalt(II) sulfide

b)

cobalt sulfide

c)

cobalt monosulfide

d)

cobaltous sulfur

e)

none of the above

70.

What is the name of Ca(NO3)2?

a)

calcium dinitrite

b)

calcium nitrate

c)

calcium nitride

d)

calcium nitrite

e)

none of the above

71.

Which formula shown is incorrect for the name given?

a)

magnesium nitrite: Mg(NO2)3

b)

calcium carbonate: CaCO3

c)

aluminum sulfate: Al2(SO4)3

d)

sodium hydrogen carbonate: NaHCO3

e)

potassium hydroxide: KOH

72.

Which formula shown is incorrect for the name given?

a)

strontium carbonate: SrCO3

b)

ammonium cyanide: NH4CN

c)

potassium acetate: KC2H3O2

d)

calcium nitrate: Ca(NO3)2

e)

lithium sulfate: LiSO4

73.

What is the name of the compound whose formula is Na2O?

a)

sodium monoxide

b)

disodium oxide

c)

disodium monoxide

d)

sodium oxide

e)

none of the above

74.

What is the formula for the acetate polyatomic ion?

a)

C3H2O3-

b)

C2H3O2-

c)

C2H3O2-

d)

C2H3O-

e)

none of the above

75.

What is the correct formula for potassium dichromate?

a)

K(CrO4)2

b)

K2Cr2O7

c)

K2CrO4

d)

K2Cr2O7

e)

none of the above

76.

What is the correct formula for ammonium hydrogen sulfate?

a)

NH4HSO4

b)

(NH4)2HSO4

c)

(NH4)2SO4

d)

Am2HSO4

e)

none of the above

77.

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

a)

MgClO3

b)

Mg2ClO3

c)

Mg(ClO3)2

d)

Mg2(ClO3)3

e)

none of the above

78.

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

a)

5+

b)

2+

c)

10+

d)

10-

e)

none of the above

79.

What is the correct formula for the hypochlorite polyatomic ion?

a)

ClO−

b)

ClO2−

c)

ClO3−

d)

ClO4−

e)

none of the above

80.

What is the correct name for the BrO4 1− ion?

a)

hypobromite

b)

perbromate

c)

bromite

d)

bromate

e)

none of the above

81.

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

a)

A) copper(I) nitrate: CuNO3

b)

B) copper(II) nitride: Cu3N2

c)

C) copper(II) nitrate: Cu(NO3)2

d)

D) copper(II) nitrite: Cu(NO2)2

e)

E) all of these are correct

82.

The name trisodium phosphate is incorrect for the compound Na3PO4 because:

a)

this compound should be called trisodium monophosphate.

b)

the sodium has a negative 3 charge.

c)

you cannot use a prefix for the first element in a molecular compound.

d)

you cannot use a prefix for the first element of an ionic compound.

e)

none of the above

83.

What is the name of the molecular compound SF5?

a)

sulfur hexafluoride

b)

sulfur heptafluoride

c)

monosulfur tetrafluoride

d)

sulfur pentafluoride

e)

none of the above

84.

What is the name of the molecular compound SO3?

a)

sulfur oxide

b)

sulfur(IV) oxide

c)

sulfur trioxide

d)

sulfur tetraoxide

e)

none of the above

85.

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

a)

nitrogen dioxide

b)

nitrogen tetroxide

c)

dinitrogen oxide

d)

dinitrogen tetroxide

e)

none of the above

86.

What is correct name of the compound whose formula is BF3?

a)

boron trifluoride

b)

boron fluoride

c)

monoboron trifluorine

d)

boron(III) fluoride

e)

none of the above

87.

What would the formula of diiodine pentasulfide be?

a)

I5S2

b)

I2S5

c)

I4S9

d)

I2S7

e)

none of the above

88.

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

a)

P5F8

b)

P7F6

c)

P6F7

d)

P7F8

e)

none of the above

89.

What is the proper name for HBr (aq)?

a)

hydrobromous acid

b)

hydrousbromic acid

c)

hydrobromic acid

d)

bromous acid

e)

none of the above

90.

What is the name of HI (aq)?

a)

hydroiodous acid

b)

hydroiodic acid

c)

iodic acid

d)

iodous acid

e)

none of the above

91.

What is the name of HIO3?

a)

iodic acid

b)

hydroiodic acid

c)

hydroiodous acid

d)

iodous acid

e)

none of the above

92.

What is the name of HNO2?

a)

nitric acid

b)

nitrous acid

c)

hydronitrous acid

d)

hydronitric acid

e)

none of the above

93.

A certain oxyacid is derived from the oxyanion SO32−SO3^{2-} . The formula for the oxyacid is:

a)

H2SO4

b)

HSO3

c)

H2SO3

d)

H3SO3

e)

none of the above

94.

What is the formula mass of sulfurous acid?

a)

82.08 amu

b)

98.08 amu

c)

83.09 amu

d)

66.08 amu

e)

none of the above

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