Question 1

A certain element is listed as having an atomic mass of 63.5 amu.It is probably true that this element contains

Accepted Answer

A) a mixture of isotopes. 
B) a mixture of neutrons. 
C) a mixture of isomers. 
D) a mixture of allotropes. 
E) a mixture of ions. 
A) a mixture of isotopes. 
B) a mixture of neutrons. 
C) a mixture of isomers. 
D) a mixture of allotropes. 
E) a mixture of ions.

Question 2

The complete combustion of octane,C8H18,yields carbon dioxide and water:
- C8 H18 + - O2→ - CO2 +  - H2O
The smallest whole-number coefficient of oxygen in the balanced equation is

Accepted Answer

A) 24. 
B) 26. 
C) 22. 
D) 23. 
E) 25. 
A) 24. 
B) 26. 
C) 22. 
D) 23. 
E) 25.

Question 3

As an ion,sodium has ______ electrons?

Accepted Answer

A) 24 
B) 14 
C) 11 
D) 29 
E) 10 
A) 24 
B) 14 
C) 11 
D) 29 
E) 10

Question 4

The average atomic mass of Eu is 151.96 amu.There are only two naturally occurring isotopes of europium,151Eu with a mass of 151.0 amu and 153Eu with a mass of 153.0 amu.The natural abundance of the 131Eu isotope must be approximately

Accepted Answer

A) 60%. 
B) 20%. 
C) 50%. 
D) 80%. 
E) 40%. 
A) 60%. 
B) 20%. 
C) 50%. 
D) 80%. 
E) 40%.

Question 5

What is the ratio of oxygen atoms to hydrogen atoms in the mineral carnotite,K2(UO2)3(VO4)2 • 3H2O?

Accepted Answer

A) 8:6 
B) 8:3 
C) 17:3 
D) 9:6 
E) 17:6 
A) 8:6 
B) 8:3 
C) 17:3 
D) 9:6 
E) 17:6

Question 6

What is the name of the compound whose formula is Al2(SO4)3?

Accepted Answer

A) aluminum sulfate 
B) dialuminum tri(sulfur tetraoxygen) 
C) aluminum sulfide 
D) aluminum persulfate 
E) aluminum sulfite 
A) aluminum sulfate 
B) dialuminum tri(sulfur tetraoxygen) 
C) aluminum sulfide 
D) aluminum persulfate 
E) aluminum sulfite

Question 7

Which of the following statements is false?

Accepted Answer

A) A crystal of calcium fluoride has equal numbers of calcium ions and fluoride ions. 
B) A sodium atom is most likely to ionize to form a cation of charge +1. 
C) A sulfide ion has a total of 18 e-. 
D) A potassium ion has a total of 18 e-. 
E) The charge on a neutral chlorine atom is zero. 
A) A crystal of calcium fluoride has equal numbers of calcium ions and fluoride ions. 
B) A sodium atom is most likely to ionize to form a cation of charge +1. 
C) A sulfide ion has a total of 18 e-. 
D) A potassium ion has a total of 18 e-. 
E) The charge on a neutral chlorine atom is zero.

Question 8

Which is a correct balanced chemical equation corresponding to the following description of a chemical reaction?
Hydrochloric acid reacts with magnesium metal to produce aqueous magnesium chloride and hydrogen gas.

Accepted Answer

A) 2HCl(aq)+ Mg(s)→ MgCl2(aq)+ 2H(g) 
B) 2HCl(aq)+ Mg(s)→ MgCl2(aq)+ H2(g) 
C) 2HCl(aq)+ Mg(s)→ MgCl(aq)+ H2(g) 
D) 2HCl(aq)+ Mg(aq)→ MgCl2(s)+ H2(g) 
E) HCl(aq)+ Mg(s)→ MgCl(aq)+ H(g) 
A) 2HCl(aq)+ Mg(s)→ MgCl2(aq)+ 2H(g) 
B) 2HCl(aq)+ Mg(s)→ MgCl2(aq)+ H2(g) 
C) 2HCl(aq)+ Mg(s)→ MgCl(aq)+ H2(g) 
D) 2HCl(aq)+ Mg(aq)→ MgCl2(s)+ H2(g) 
E) HCl(aq)+ Mg(s)→ MgCl(aq)+ H(g)

Question 9

The complete combustion of phenylhydrazine,C6H5NHNH2,with the oxidizer dinitrogen tetraoxide is shown in the following equation:
__ C6H5NHNH2 + __ N2O4 → __ CO2 + __ H2O + __ N2
When this equation is balanced,the sum of all the coefficients (using smallest whole numbers)is

Accepted Answer

A) 30. 
B) 20. 
C) 25. 
D) 10. 
E) 15. 
A) 30. 
B) 20. 
C) 25. 
D) 10. 
E) 15.

Question 10

Which of the following has 62 neutrons,46 protons,and 46 electrons?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 11

When the equation
__ (CH3)2NNH2 + __ N2O4 → __ N2 + __ H2O + __ CO2
Is balanced,the sum of all the coefficients (simplest whole number)is

Accepted Answer

A) 13. 
B) 12. 
C) 9. 
D) 10. 
E) 11. 
A) 13. 
B) 12. 
C) 9. 
D) 10. 
E) 11.

Question 12

The elements in a row of the periodic table are known as

Accepted Answer

A) metals. 
B) a period. 
C) metalloids. 
D) a family. 
E) a group. 
A) metals. 
B) a period. 
C) metalloids. 
D) a family. 
E) a group.

Question 13

The mass spectrum of an element with two naturally occurring isotopes is shown below.Its average atomic mass would be best estimated as

Accepted Answer

A) less than 26 amu but greater than 25 amu. 
B) less than 25 amu but greater than 24 amu. 
C) equal to 24 amu. 
D) equal to 25 amu. 
E) greater than 26 amu. 
A) less than 26 amu but greater than 25 amu. 
B) less than 25 amu but greater than 24 amu. 
C) equal to 24 amu. 
D) equal to 25 amu. 
E) greater than 26 amu.

Question 14

What is the formula for calcium nitride?

Accepted Answer

A) CaNO2 
B) Ca(NO3)2 
C) Ca(NO2)2 
D) Ca3N2 
E) Ca2N3 
A) CaNO2 
B) Ca(NO3)2 
C) Ca(NO2)2 
D) Ca3N2 
E) Ca2N3

Question 15

Which of the following statements is true concerning the two nuclides 16O and 17O ?

Accepted Answer

A) They have the same number of neutrons. 
B) They are isotopes. 
C) They have the same relative atomic mass. 
D) They have the same mass number. 
E) They have different chemical properties. 
A) They have the same number of neutrons. 
B) They are isotopes. 
C) They have the same relative atomic mass. 
D) They have the same mass number. 
E) They have different chemical properties.

Question 16

Which of the following molecules is a hydrocarbon?

Accepted Answer

A) H2O 
B) CH3CH2CH3 
C) C6H12O6 
D) CH3CH2OH 
E) CH3OCH3 
A) H2O 
B) CH3CH2CH3 
C) C6H12O6 
D) CH3CH2OH 
E) CH3OCH3

Question 17

Which of the following conclusions regarding Rutherford's gold foil experiment is not consistent with the observations?

Accepted Answer

A) The nucleus occupies only a small portion of the space of an atom. 
B) Most alpha particles travel straight through the gold foil. 
C) The nucleus occupies a large amount of the atom space. 
D) The nucleus,like the alpha particles used to bombard the gold foil,is positively charged. 
E) Wide angle deflections result from a collision of an alpha particle and a gold atom nucleus. 
A) The nucleus occupies only a small portion of the space of an atom. 
B) Most alpha particles travel straight through the gold foil. 
C) The nucleus occupies a large amount of the atom space. 
D) The nucleus,like the alpha particles used to bombard the gold foil,is positively charged. 
E) Wide angle deflections result from a collision of an alpha particle and a gold atom nucleus.

Question 18

Which formula is best described as a (condensed)structural formula?

Accepted Answer

A) C2B10H12 
B) C6H11Cl 
C) CH3CH2CH2CH2Cl 
D) C12H22O11 
E) C2H6O 
A) C2B10H12 
B) C6H11Cl 
C) CH3CH2CH2CH2Cl 
D) C12H22O11 
E) C2H6O

Question 19

What is the formula for the chloride of gadolinium(III)?

Accepted Answer

A) Gd2(ClO2)3 
B) Gd(ClO4)2 
C) Gd3Cl 
D) GdCl3 
E) Gd(ClO3)3 
A) Gd2(ClO2)3 
B) Gd(ClO4)2 
C) Gd3Cl 
D) GdCl3 
E) Gd(ClO3)3

Question 20

Which combination of protons,neutrons,and electrons correctly represents a 57Fe nuclide?

Accepted Answer

A) 26 protons,31 neutrons,57 electrons 
B) 26 protons,31 neutrons,31 electrons 
C) 26 protons,31 neutrons,26 electrons 
D) 57 protons,26 neutrons,57 electrons 
E) 57 protons,26 neutrons,26 electrons 
A) 26 protons,31 neutrons,57 electrons 
B) 26 protons,31 neutrons,31 electrons 
C) 26 protons,31 neutrons,26 electrons 
D) 57 protons,26 neutrons,57 electrons 
E) 57 protons,26 neutrons,26 electrons

Exam 2: Atoms, molecules, and Ions

A certain element is listed as having an atomic mass of 63.5 amu.It is probably true that this element contains

The complete combustion of octane,C8H18,yields carbon dioxide and water: - C8 H18 + - O2→ - CO2 + - H2O The smallest whole-number coefficient of oxygen in the balanced equation is

As an ion,sodium has ______ electrons?

The average atomic mass of Eu is 151.96 amu.There are only two naturally occurring isotopes of europium,151Eu with a mass of 151.0 amu and 153Eu with a mass of 153.0 amu.The natural abundance of the 131Eu isotope must be approximately

What is the ratio of oxygen atoms to hydrogen atoms in the mineral carnotite,K2(UO2)3(VO4)2 • 3H2O?

What is the name of the compound whose formula is Al2(SO4)3?

Which of the following statements is false?

Which is a correct balanced chemical equation corresponding to the following description of a chemical reaction? Hydrochloric acid reacts with magnesium metal to produce aqueous magnesium chloride and hydrogen gas.

The complete combustion of phenylhydrazine,C6H5NHNH2,with the oxidizer dinitrogen tetraoxide is shown in the following equation: __ C6H5NHNH2 + __ N2O4 → __ CO2 + __ H2O + __ N2 When this equation is balanced,the sum of all the coefficients (using smallest whole numbers)is

Which of the following has 62 neutrons,46 protons,and 46 electrons?

When the equation __ (CH3)2NNH2 + __ N2O4 → __ N2 + __ H2O + __ CO2 Is balanced,the sum of all the coefficients (simplest whole number)is

The elements in a row of the periodic table are known as

The mass spectrum of an element with two naturally occurring isotopes is shown below.Its average atomic mass would be best estimated as

What is the formula for calcium nitride?

Which of the following statements is true concerning the two nuclides 16O and 17O ?

Which of the following molecules is a hydrocarbon?

Which of the following conclusions regarding Rutherford's gold foil experiment is not consistent with the observations?

Which formula is best described as a (condensed)structural formula?

What is the formula for the chloride of gadolinium(III)?

Which combination of protons,neutrons,and electrons correctly represents a 57Fe nuclide?

Chemistry and Measurement

Calculations With Chemical Formulas and Equations

Chemical Reactions

The Gaseous State

Thermochemistry

Quantum Theory of the Atom

Electron Configurations and Periodicity

Ionic and Covalent Bonding

Molecular Geometry and Chemical Bonding Theory

States of Matter; Liquids and Solids

Solutions

Rates of Reaction

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Thermodynamics and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry of the Main-Group Metals

The Transition Elements and Coordination Compounds

Organic Chemistry

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The complete combustion of octane,C₈H₁₈,yields carbon dioxide and water: _- C₈H₁₈+ _- O₂→ _- CO_{2 +} _- H₂O The smallest whole-number coefficient of oxygen in the balanced equation is

The average atomic mass of Eu is 151.96 amu.There are only two naturally occurring isotopes of europium,¹⁵¹Eu with a mass of 151.0 amu and ¹⁵³Eu with a mass of 153.0 amu.The natural abundance of the ¹³¹Eu isotope must be approximately

What is the ratio of oxygen atoms to hydrogen atoms in the mineral carnotite,K₂(UO₂)₃(VO₄)₂ • 3H₂O?

What is the name of the compound whose formula is Al₂(SO₄)₃?

The complete combustion of phenylhydrazine,C₆H₅NHNH₂,with the oxidizer dinitrogen tetraoxide is shown in the following equation: C₆H₅NHNH₂ + N₂O₄ → CO₂ + H₂O + __ N₂ When this equation is balanced,the sum of all the coefficients (using smallest whole numbers)is

When the equation (CH₃)₂NNH₂ + N₂O₄ → N₂ + H₂O + __ CO₂ Is balanced,the sum of all the coefficients (simplest whole number)is

Which of the following statements is true concerning the two nuclides ¹⁶O and ¹⁷O ?

Which combination of protons,neutrons,and electrons correctly represents a ⁵⁷Fe nuclide?