Chemistry Chapter 3 The analysis of 0.246 g of organic compound gives

73) What is the oxidation state of chlorine in sodium hypochlorite?

A) +1

B) -1

C) +2

D) +3

E) +5

74) The element M forms the chloride MCl4 containing 75.0% Cl by mass. What is the molar mass of M?

A) 22.7 g/mol

B) 21.2 g/mol

C) 11.8 g/mol

D) 39.55 g/mol

E) 47.3 g/mol

75) How many grams of H2O are there in 10.0 g of tetraphenylarsonium chloride

dihydrate,

A) 0.860 g

B) 0.792 g

C) 0.430 g

D) 0.396 g

E) 0.239 g

76) A 1.500 g sample of compound containing only C, H, and O was burned completely. The only

combustion products were 1.738 g CO2 and 0.711 g H2O. What is the empirical formula of the

compound?

A) CH2O2

B) CH2O

C) C2H4O3

D) CHO

E) CH4O

77) A compound has the following percentage composition, by weight: 22.0% Cu, 12.9% Fe, 16.6% C,

19.4% N, and 29.1% H2O. Write a plausible (empirical) formula for this hydrate.

A) CuFe(CN)4 ∙ 4 H2O

B) CuF(CN)4 ∙ 5 H2O

C) Cu3Fe2(CN)12 ∙ 14 H2O

D) CuF(CN)4

E) Cu3Fe2(CN)12

78) To produce ferrocene one requires 2.33 g of C5H5 (65.0 g/mol) for every 1.00 g of Fe used (55.9 g/mol).

What is the value of x in the formula of ferrocene:

A) 1

B) 2

C) 3

D) 4

E) 5

79) 4.72 g of a compound of carbon, hydrogen, and silver was burned in an atmosphere of oxygen,

yielding 7.95 g of CO2, 1.02 g of H2O, and 3.02 g of a mixture of silver and silver oxide. Because the

production of this mixture yielded an indeterminate value for the amount of silver, another sample of the

compound weighing 8.12 g was reacted with a solution of NaCl, yielding 5.57 g of AgCl. What is the

empirical formula of the compound?

A) C5H5Ag

B) C8H8Ag

C) C8H5Cl

D) C8H5Ag

E) C5H8Ag

80) The analysis of 0.246 g of organic compound gives 0.656 g CO2, 0.134 g H2O, and 1.86 × 10-3 mol N2

gas. What would be the empirical formula of this organic compound?

A) C3H3N

B) C4H4N

C) C2H2N2

D) C2H2N

E) C3H3N2

20

81) What is the mass percent of H2O in magnesium chloride hexahydrate?

A) 10.7%

B) 64.4%

C) 8.86%

D) 26.6%

E) 53.2%

82) The oxidation state of silver in the complex ion Ag(CN) is ________.

A) –1

B) +1

C) 0

D) +2

E) –2

83) The oxidation state of iodine in orthoparaperiodic acid, H5IO6, is ________.

A) +1

B) –1

C) +5

D) +7

E) –7

84) The oxidation state of vanadium in VO2+ is ________.

A) –2

B) +2

C) +1

D) –4

E) +4

Answer: E

Diff: 1 Type: BI Var: 1

Reference: Section 3-4

85) The oxidation state of oxygen in oxygen difluoride, OF2, is ________.

A) –1

B) +1

C) –2

D) +2

E) –

86) Arrange the following in order of increasing oxidation state of chlorine:

NaClO, NaClO3, NaClO2, and NaClO4.

A) NaClO, NaClO2, NaClO3, NaClO4

B) NaClO4, NaClO3, NaClO2, NaClO

C) NaClO, NaClO3, NaClO2, NaClO4

D) NaClO4, NaClO, NaClO3, NaClO2

E) NaClO3, NaClO2, NaClO, NaClO4

87) What is the formula of sodium hypochlorite?

A) NaCl

B) NaClO

C) NaClO2

D) NaClO3

E) NaClO4

88) What is the formula of sodium bicarbonate?

A) NaHCO3

B) Na2CO3

C) NaHCO2

D) Na2C2

E) Na2C2O4

89) The correct chemical name for the compound SbCl3 is ________.

A) tin trichloride

B) tin chloride

C) stannous trichloride

D) antimony(IV) chloride

E) antimony(III) chloride

90) The correct chemical name for the substance Al(OH)3 is ________.

A) aluminum hydroxide

B) aluminum trihydroxide

C) aluminum oxytrihydrate

D) aluminum(II) hydroxide

E) aluminum trihydrogenoxide

91) The correct chemical name for the compound KNO2 is ________.

A) potassium nitrate

B) potassium nitrite

C) potassium nitrogen dioxide

D) potassium nitrous oxide

E) potassium hyponitrite

92) The formula of barium nitride is ________.

A) Ba3N2

B) Ba2N2

C) BaN

D) Ba2N

93) The name of the compound Cr(ClO4)3∙6H2O is ________.

A) chromium(III) perchlorate hexahydrate

B) chromium(II) perchlorate hexahydrate

C) chromate perchlorate hydrate

D) chromate(III) perchlorate hexahydrate

94) The correct chemical name for the compound HIO is ________.

A) periodic acid

B) hydrogen iodide oxide

C) hydrogen iodite

D) hypoiodous acid

E) hypoiodic acid

95) What is the correct name for the following organic structure?

CH3CH2CHBrCH2CH3

A) 3-bromopentane

B) 3-bromopropane

C) 1-bromo-1-ethylpropane

D) pentane

E) pentylbromide

96) What is the correct name for the following organic structure?

CH3C(CH3)2CH3

A) pentane

B) 2,2-dimethylpropane

C) 2-methylbutane

D) 1,3-dimethylpropane

E) 2-ethylpropane

97) What is the correct name for the following organic structure?

CH3CH(OH)CH2CH2CH2CH3

A) pentyl alcohol

B) 5-hexanol

C) 2-hexanol

D) 1-methylpentanol

E) 2-methylpentanol

98) What is the correct name for the following organic structure?

CH3CH2CH2CHClCH2CH2CH2COOH

A) octanoic acid

B) octylchloride

C) 5-octylchloride

D) 5-chlorooctanoic acid

E) 4-chlorooctanoic acid

99) What is the correct name for the following organic structure?

CH2CHCH2CH(CH3)CH3

A) hexene

B) hexane

C) 1-hexene

D) 4-methyl-2-pentene

E) 4-methyl-1-pentene

100) The suffix -ol designates the presence of which functional group?

A) –OH

B) –COOH

C) –CH3

D) –COOCH3

E) -C(O)H

101) In which set do all elements tend to form anions in binary ionic compounds?

A) C, S, Pb

B) K, Fe, Br

C) Li, Na, K

D) N, O, I

102) What type of bonding is found in the compound OF2?

A) covalent bonding

B) hydrogen bonding

C) ionic bonding

D) metallic bonding

103) Which one of the following compounds contains ionic bonds?

A) SrO

B) HBr

C) PBr3

D) SiO2

104) Which of the following is the correct chemical formula for a molecule of astatine?

A) At

B) At–

C) At+

D) At2

105) Which of the compounds, Li3N , N H3, C3H8, IF3, are ionic compounds?

A) only C3H8

B) only LiN

C) LiN and NH3

D) NH, C3H8, and IF3

106) Which of the compounds, C4H10, BaCl2, Ni(NO3)2, SF6, are expected to exist as molecules?

A) only C4H10

B) C4H10 and SF6

C) C4H10, Ni(NO3)2, and SF6

D) BaCl2 and Ni(NO3)2

107) Which of the following elements has the LEAST tendency to form an ion?

A) Ca

B) K

C) Kr

D) Se

108) In which set do all elements tend to form cations in binary ionic compounds?

A) K, Ga, O

B) Sr, Ni, Hg

C) N, P, Bi

D) O, Br, I

109) The solid compound Na3PO4 contains:

A) Na+, P5+, and O2- ions

B) Na+ and PO42- ions

C) Na3+ and PO42- ions

D) Na3PO4 molecules

110) What is the chemical formula for iron(III) sulfate?

A) Fe3S

B) Fe3SO4

C) Fe2S3

D) Fe2(SO4)3

111) Rb2S is named:

A) rubidium disulfide

B) rubidium sulfide

C) rubidium(II) sulfide

D) rubidium sulfur

112) What is the chemical formula for calcium hydroxide?

A) CaH2

B) CaOH

C) CaOH2

D) Ca(OH)2

113) What is the chemical formula for magnesium hydride?

A) MgH2

B) MgOH

C) MgOH2

D) Mg(OH)2

114) The chemical formula for lithium peroxide is:

A) LiOH

B) LiO2

C) Li2O

D) Li2O2

115) The compound Cu(N O3 )2,is named:

A) copper nitrate(II)

B) copper(I) nitrate

C) copper(I) nitrate(II)

D) copper(II) nitrate

116) The compound NO is named:

A) nitrate

B) nitrite

C) nitrogen monoxide

D) nitrogen(IV) oxide

117) The chemical formula for calcium nitride is:

A) Ca(NO3)2

B) Ca(NO2)2

C) Ca3N2

D) CaN2

118) An aqueous solution of H2S is named:

A) hydrosulfuric acid

B) hydrosulfurous acid

C) sulfuric acid

D) sulfurous acid

119) The chemical formula for the selenite ion is:

A) Se–

B) Se2-

C) SeO32-

D) SeO42-

120) The ion IO2– is named:

A) iodate ion

B) iodite ion

C) iodine dioxide ion

D) iodine(II) oxide ion

121) The chemical formula for sulfurous acid is:

A) H2S

B) H2SO3

C) HSO4

D) H2S2O7

122) What is the charge on the Cr ions in Cr2O3?

A) -2

B) +1

C) +2

D) +3

123) What is the molar mass of chlorine gas?

A) 35.5 g mol-1

B) 71.0 g mol-1

C) 6.02 × 1023 g mol-1

D) 1.20 × 1023 g mol-1

124) What is the mass of a single fluorine molecule, F2?

A) 3.155 × 10–23 g

B) 6.310 × 10–23 g

C) 19.00 g

D) 38.00 g

125) What is the mass of 0.500 mol of dichlorodifluoromethane, CCl2F2?

A) 4.14 × 10-3 g

B) 60.5 g

C) 121 g

D) 242 g

126) How many moles are there in 3.00 g of ethanol, CH3CH2OH?

A) 0.00725 mol

B) 0.0652 mol

C) 15.3 mol

D) 138 mol

127) What is the mass of 8.50 × 1022 molecules of NH3?

A) 0.00829 g

B) 0.417 g

C) 2.40 g

D) 121 g

128) What is the molar mass of 1-butene if 5.38 × 1016 molecules of 1-butene weigh 5.00 μg?

A) 56.0 g mol-1

B) 178 g mol-1

C) 224 g mol-1

D) 447 g mol-1

129) What mass of ammonia, N H3, contains the same number of molecules as 3.00 g of

trichlorofluoromethane, CCl3F?

A) 0.0412 g

B) 0.331 g

C) 2.69 g

D) 24.2 g

130) What mass of phosphorus pentafluoride, PF5, has the same number of fluorine atoms as 25.0 g of

oxygen difluoride, OF2?

A) 0.933 g

B) 10.0 g

C) 23.3 g

D) 146 g

131) How many anions are there in 2.50 g of MgBr2?

A) 8.18 × 1021 anions

B) 1.64 × 1022 anions

C) 4.43 × 1025 anions

D) 8.87 × 1025 anions

132) Which of the following has the greatest mass?

A) 3.88 × 1022 molecules of O2

B) 1.00 g of O2

C) 0.0312 mol of O2

D) All of the above have the same mass.

133) Which of the following has the smallest mass?

A) 3.50 × 1023 molecules of I2

B) 85.0 g of Cl2

C) 2.50 mol of F2

D) 0.050 kg of Br2

134) The molecular weight of sucrose ( C12H22O11 ), table sugar, is ________ amu (rounded to one

decimal place).

A) 330.3

B) 29.0

C) 342.3

D) 45.0

E) 182.0

135) A sample of pure lithium nitrate contains 10.1% lithium by mass. What is the % lithium by mass in a

sample of pure lithium nitrate that has twice the mass of the first sample?

A) 5.05%

B) 10.1%

C) 20.2%

D) 40.4%

136) A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much

calcium is contained in 40.0 g of calcium fluoride?

A) 2.27 g

B) 7.70 g

C) 15.0 g

D) 20.5 g

137) Which one of the following contains 39% carbon by mass?

A) C2H2

B) CH4

C) CH3NH2

D) CO2

138) Determine the mass percent (to the hundredths place) of H in sodium bicarbonate (NaHCO3).

139) What is the empirical formula of a compound that is 62.0% C, 10.4% H, and 27.5% O by mass?

A)

B)

C)

D)

E)

140) How many Fe(II) ions are there in 20.0 g of FeSO4?

A) 2.19 × 10–25 iron(II) ions

B) 7.92 × 1022 iron(II) ions

C) 4.57 × 1024 iron(II) ions

D) 1.82 × 1027 iron(II) ions

141) How many oxygen atoms are there in 7.00 g of sodium dichromate, Na2Cr2O7?

A) 0.187 oxygen atoms

B) 2.30 × 1021 oxygen atoms

C) 1.60 × 1022 oxygen atoms

D) 1.13 × 1023 oxygen atoms

142) How many chloride ions are there in 4.50 mol of aluminum chloride?

A) 3.00 chloride ions

B) 13.5 chloride ions

C) 2.71 × 1024 chloride ions

D) 8.13 × 1024 chloride ions

143) How many cations are there in 10.0 g of sodium phosphate?

A) 3.67 × 1022 cations

B) 1.10 × 1023 cations

C) 9.87 × 1024 cations

D) 2.96 × 1025 cations

144) What is the empirical formula of a substance that contains 5.28 g of C, 1.11 g of H, and 3.52 g of O?

A) C2H O5

B) C2H4O2

C) C2H4O3

D) C3H4O4

145) Which one of the following is NOT an empirical formula?

A) CHO

B) CH2O

C) C2H4O

D) C2H4O2

146) Methane and oxygen react to form carbon dioxide and water. What mass of water is formed if 1.6 g

of methane reacts with 6.4 g of oxygen to produce 4.4 g of carbon dioxide?

A) 3.6 g

B) 4.4 g

C) 7.4 g

D) 8.0 g

E) 2.7 g

147) Combustion analysis of an unknown compound containing only carbon and hydrogen produced

0.2845 g of CO2 and 0.1451 g of H2O. What is the empirical formula of the compound?

A) CH2

B) C2H5

C) C4H10

D) C5H2

148) Combustion analysis of 1.200 g of an unknown compound containing carbon, hydrogen, and oxygen

produced 2.086 g of CO2 and 1.134 g of H2O. What is the empirical formula of the compound?

A) C2H5O

B) C2H5O2

C) C2H10O3

D) C3H8O2

149) A certain alcohol contains only three elements, carbon, hydrogen, and oxygen. Combustion of a

50.00 g sample of the alcohol produced 95.50 g of CO2 and 58.70 g of H2O. What is the empirical

formula of the alcohol?

150) What is the oxidation number of the sulfur atom in K2SO4?

A) -2

B) +2

C) +4

D) +6

151) What is the oxidation number of the chromium atom in K2CrO4?

A) -2

B) +2

C) +6

D) +7

152) What is the oxidation number of the oxygen atom in Na2O2?

A) -2

B) -1

C) +1

D) +2