Question 1

The substance, CoCl2, is useful as a humidity indicator because it changes from pale blue to pink as it gains water from moist air. What is its name?

Accepted Answer

A)  cobalt dichloride 
B)  cobalt(II) chloride 
C)  cobalt chloride 
D)  cobaltic chloride 
E)  copper(II) chloride 
A)  cobalt dichloride 
B)  cobalt(II) chloride 
C)  cobalt chloride 
D)  cobaltic chloride 
E)  copper(II) chloride

Question 2

The compound, NaH2PO4, is present in many baking powders. What is its name?

Accepted Answer

A)  sodium biphosphate 
B)  sodium hydrogen phosphate 
C)  sodium dihydrogen phosphate 
D)  sodium hydrophosphate 
E)  sodium dihydride phosphate 
A)  sodium biphosphate 
B)  sodium hydrogen phosphate 
C)  sodium dihydrogen phosphate 
D)  sodium hydrophosphate 
E)  sodium dihydride phosphate

Question 3

Which of the following is the empirical formula for hexane, C6H14?

Accepted Answer

A)  C12H28 
B)  C6H14 
C)  C3H7 
D)  CH2.3 
E)  C0.43H 
A)  C12H28 
B)  C6H14 
C)  C3H7 
D)  CH2.3 
E)  C0.43H

Question 4

Who is credited with discovering the atomic nucleus?

Accepted Answer

A)  Dalton 
B)  Gay-Lussac 
C)  Thomson 
D)  Millikan 
E)  Rutherford 
A)  Dalton 
B)  Gay-Lussac 
C)  Thomson 
D)  Millikan 
E)  Rutherford

Question 5

Kaolinite, a clay mineral with the formula Al4Si4O10(OH)8, is used as a filler in slick-paper for magazines and as a raw material for ceramics. Analysis shows that 14.35 g of kaolinite contains 8.009 g of oxygen. Calculate the mass percent of oxygen in kaolinite.

Accepted Answer

A)  1.792 mass % 
B)  24.80 mass % 
C)  30.81 mass % 
D)  34.12 mass % 
E)  55.81 mass % 
A)  1.792 mass % 
B)  24.80 mass % 
C)  30.81 mass % 
D)  34.12 mass % 
E)  55.81 mass %

Question 6

Which one of the following combinations of names and formulas is incorrect?

Accepted Answer

A)  H3PO4 phosphoric acid 
B)  HNO3 nitric acid 
C)  NaHCO3 sodium carbonate 
D)  H2CO3 carbonic acid 
E)  KOH potassium hydroxide 
A)  H3PO4 phosphoric acid 
B)  HNO3 nitric acid 
C)  NaHCO3 sodium carbonate 
D)  H2CO3 carbonic acid 
E)  KOH potassium hydroxide

Question 7

A) Give the names of the following ions: (i) O22- and (ii) SO42-
B) Write down the formulas of the following ions: (i) ammonium and (ii) nitrate

Accepted Answer

a. (i) peroxide and

Question 8

What is the name of the acid formed when HBr gas is dissolved in water?

Accepted Answer

A)  bromic acid 
B)  bromous acid 
C)  hydrobromic acid 
D)  hydrobromous acid 
E)  hydrobromidic acid 
A)  bromic acid 
B)  bromous acid 
C)  hydrobromic acid 
D)  hydrobromous acid 
E)  hydrobromidic acid

Question 9

What is the name of P4Se3?

Accepted Answer

A)  phosphorus selenide 
B)  phosphorus triselenide 
C)  tetraphosphorus selenide 
D)  phosphoric selenide 
E)  tetraphosphorus triselenide 
A)  phosphorus selenide 
B)  phosphorus triselenide 
C)  tetraphosphorus selenide 
D)  phosphoric selenide 
E)  tetraphosphorus triselenide

Question 10

Sodium chromate is used to protect iron from corrosion and rusting. Determine its molecular mass.

Accepted Answer

A)  261.97 amu 
B)  238.98 amu 
C)  161.97 amu 
D)  138.98 amu 
E)  74.99 amu 
A)  261.97 amu 
B)  238.98 amu 
C)  161.97 amu 
D)  138.98 amu 
E)  74.99 amu

Question 11

Who is credited with measuring the mass/charge ratio of the electron?

Accepted Answer

A)  Dalton 
B)  Gay-Lussac 
C)  Thomson 
D)  Millikan 
E)  Rutherford 
A)  Dalton 
B)  Gay-Lussac 
C)  Thomson 
D)  Millikan 
E)  Rutherford

Question 12

Potassium permanganate is a strong oxidizer that reacts explosively with easily oxidized materials. What is its formula?

Accepted Answer

A)  KMnO3 
B)  KMnO4 
C)  K2MnO4 
D)  K(MnO4)2 
E)  K2Mn2O7 
A)  KMnO3 
B)  KMnO4 
C)  K2MnO4 
D)  K(MnO4)2 
E)  K2Mn2O7

Question 13

Which of the following ions occurs commonly?

Accepted Answer

A)  P3+ 
B)  Br7+ 
C)  O6+ 
D)  Ca2+ 
E)  K- 
A)  P3+ 
B)  Br7+ 
C)  O6+ 
D)  Ca2+ 
E)  K-

Question 14

element that lies in period 4?

Accepted Answer

A)  Cr 
B)  Hf 
C)  W 
D)  Ti 
E)  Se 
A)  Cr 
B)  Hf 
C)  W 
D)  Ti 
E)  Se

Question 15

In the modern periodic table, the order in which the elements are placed is based on

Accepted Answer

A)  atomic mass. 
B)  mass number. 
C)  atomic number. 
D)  atomic size. 
E)  chemical reactivity. 
A)  atomic mass. 
B)  mass number. 
C)  atomic number. 
D)  atomic size. 
E)  chemical reactivity.

Question 16

Rutherford bombarded gold foil with alpha (a) particles and found that a small percentage of the particles were deflected. Which of the following was not accounted for by the model he proposed for the structure of atoms?

Accepted Answer

A)  the small size of the nucleus 
B)  the charge on the nucleus 
C)  the total mass of the atom 
D)  the existence of protons 
E)  the presence of electrons outside the nucleus 
A)  the small size of the nucleus 
B)  the charge on the nucleus 
C)  the total mass of the atom 
D)  the existence of protons 
E)  the presence of electrons outside the nucleus

Question 17

The substance, KClO3, is a strong oxidizer used in explosives, fireworks, and matches. What is its name?

Accepted Answer

A)  potassium chlorite 
B)  potassium chloride 
C)  potassium(I) chlorite 
D)  potassium(I) chlorate 
E)  potassium chlorate 
A)  potassium chlorite 
B)  potassium chloride 
C)  potassium(I) chlorite 
D)  potassium(I) chlorate 
E)  potassium chlorate

Question 18

What are the approximate carbon:hydrogen mass ratios in methane (CH4) and ethyne (C2H2)?

Accepted Answer

A)  1:4 and 1:1 
B)  3:2 and 6:1 
C)  3:1 and 12:1 
D)  3:2 and 12:1 
E)  3:1 and 6:1 
A)  1:4 and 1:1 
B)  3:2 and 6:1 
C)  3:1 and 12:1 
D)  3:2 and 12:1 
E)  3:1 and 6:1

Question 19

Which one of the following combinations of names and formulas of ions is incorrect?

Accepted Answer

A)  O2- oxide 
B)  Al3+ aluminum 
C)  NO3- nitrate 
D)  PO43- phosphate 
E)  CrO42- chromate 
A)  O2- oxide 
B)  Al3+ aluminum 
C)  NO3- nitrate 
D)  PO43- phosphate 
E)  CrO42- chromate

Question 20

Select the incorrect statement about elements and compounds.

Accepted Answer

A)  All ionic compounds are neutral. 
B)  Some elements exist as molecules. 
C)  The bonding in compounds may be covalent or ionic. 
D)  The molecular formula of a compound provides more information than the structural formula. 
E)  Among the elements, there are more metals than non-metals. 
A)  All ionic compounds are neutral. 
B)  Some elements exist as molecules. 
C)  The bonding in compounds may be covalent or ionic. 
D)  The molecular formula of a compound provides more information than the structural formula. 
E)  Among the elements, there are more metals than non-metals.

Exam 2: The Components of Matter

The substance, CoCl2, is useful as a humidity indicator because it changes from pale blue to pink as it gains water from moist air. What is its name?

The compound, NaH2PO4, is present in many baking powders. What is its name?

Which of the following is the empirical formula for hexane, C6H14?

Who is credited with discovering the atomic nucleus?

Kaolinite, a clay mineral with the formula Al4Si4O10(OH)8, is used as a filler in slick-paper for magazines and as a raw material for ceramics. Analysis shows that 14.35 g of kaolinite contains 8.009 g of oxygen. Calculate the mass percent of oxygen in kaolinite.

Which one of the following combinations of names and formulas is incorrect?

A) Give the names of the following ions: (i) O22- and (ii) SO42- B) Write down the formulas of the following ions: (i) ammonium and (ii) nitrate

What is the name of the acid formed when HBr gas is dissolved in water?

What is the name of P4Se3?

Sodium chromate is used to protect iron from corrosion and rusting. Determine its molecular mass.

Who is credited with measuring the mass/charge ratio of the electron?

Potassium permanganate is a strong oxidizer that reacts explosively with easily oxidized materials. What is its formula?

Which of the following ions occurs commonly?

element that lies in period 4?

In the modern periodic table, the order in which the elements are placed is based on

Rutherford bombarded gold foil with alpha (a) particles and found that a small percentage of the particles were deflected. Which of the following was not accounted for by the model he proposed for the structure of atoms?

The substance, KClO3, is a strong oxidizer used in explosives, fireworks, and matches. What is its name?

What are the approximate carbon:hydrogen mass ratios in methane (CH4) and ethyne (C2H2)?

Which one of the following combinations of names and formulas of ions is incorrect?

Select the incorrect statement about elements and compounds.

Keys to the Study of Chemistry

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

The substance, CoCl₂, is useful as a humidity indicator because it changes from pale blue to pink as it gains water from moist air. What is its name?

The compound, NaH₂PO₄, is present in many baking powders. What is its name?

Which of the following is the empirical formula for hexane, C₆H₁₄?

Kaolinite, a clay mineral with the formula Al₄Si₄O₁₀(OH)₈, is used as a filler in slick-paper for magazines and as a raw material for ceramics. Analysis shows that 14.35 g of kaolinite contains 8.009 g of oxygen. Calculate the mass percent of oxygen in kaolinite.

A) Give the names of the following ions: (i) O₂^2- and (ii) SO₄^2- B) Write down the formulas of the following ions: (i) ammonium and (ii) nitrate

What is the name of P₄Se₃?

The substance, KClO₃, is a strong oxidizer used in explosives, fireworks, and matches. What is its name?

What are the approximate carbon:hydrogen mass ratios in methane (CH₄) and ethyne (C₂H₂)?