Question 1

Which of the following equations is not balanced?

Accepted Answer

A)  2Sb2OS2 + 10O2 → 2Sb2O5 + 4SO3
B)  (NH4) 2Cr2O7 → N2 + 4H2O + Cr2O3
C)  C12H22O11 + 12O2 → 12CO2 + 11H2O
D)  2NaCl + Pb(NO3) 2 → PbCl2 + 2NaNO3
E)  Fe3O4 + 3CO → 3Fe + 3CO2

Question 2

The formulas of the carbonate ion,the ammonium ion,and the chlorate ion are represented,respectively,as

Accepted Answer

A)  CO32-,NH2-,ClO3-.
B)  CO32-,NH4+,ClO3-.
C)  CO2-,NH4+,ClO-.
D)  P3-,NH3+,ClO2-.
E)  CO32-,NH3+,ClO2-.

Question 3

What is the correct formula for manganese(III) oxide?

Accepted Answer

A)  MnO
B)  Mn2O
C)  Mn3O2
D)  Mn2O3
E)  MnO2

Question 4

The complete combustion of propane,C3H8,yields carbon dioxide and water:
- C3 H8 + - O2→ - CO2 +  - H2O
The smallest whole-number coefficient of oxygen in the balanced equation is

Accepted Answer

A)  6.
B)  3.
C)  7.
D)  4.
E)  5.

Question 5

Energy from the following reaction provided the lift for the moon lander:
__ (CH3) 2N2H2 + __ N2O4 → __ N2 + __ H2O + __ CO2
When the equation is balanced,the smallest whole-number coefficient of nitrogen is

Accepted Answer

A)  5.
B)  4.
C)  1.
D)  3.
E)  2.

Question 6

The chemical name for the binary,non-ionic molecule with the formula HI is

Accepted Answer

A)  hydrogen iodide.
B)  monohydrogen iodide.
C)  hydride iodide.
D)  hydrogen iodine.
E)  monohydrogen iodine.

Question 7

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Accepted Answer

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Question 8

Which of the following is the atomic symbol for the element cobalt?

Accepted Answer

A)  CO
B)  Co
C)  C
D)  co
E)  All of the above

Question 9

If the Thomson model of the atom had been correct,Rutherford would have observed

Accepted Answer

A)  alpha particles bouncing off the foil.
B)  alpha particles going through the foil with little or no deflection.
C)  alpha particles greatly deflected by the metal foil.
D)  positive particles formed in the foil.
E)  None of the above observations is consistent with the Thomson model of the atom.

Question 10

The formulas of the hydroxide ion,the nitrate ion,and the phosphate ion are represented,respectively,as

Accepted Answer

A)  OH-,NO2-,PO33-.
B)  OH-,NO2-,PO43-.
C)  H-,NO2-,P3-.
D)  H-,NO3-,P3-.
E)  OH-,NO3-,PO43-.

Question 11

The correct name for Zn2+ is

Accepted Answer

A)  monozinc ion.
B)  zinc ion.
C)  zinc(2) ion.
D)  zinc(I) ion.
E)  zinc.

Question 12

What is the formula of calcium nitrite?

Accepted Answer

A)  Ca(NO2) 2
B)  Ca3N2
C)  Ca2(NO2) 2
D)  Ca2N3
E)  Ca(NO2) 3

Question 13

Which of the following elements has the largest atomic mass?

Accepted Answer

A)  hafnium
B)  nickel
C)  mercury
D)  argon
E)  carbon

Question 14

Lithium has two naturally occurring isotopes,6Li and 7Li .The average atomic mass of lithium is 6.941.Which of the following statements concerning the relative abundance of each isotope is correct?

Accepted Answer

A)  The abundance of 7Li is greater than 6Li.
B)  The abundance of 7Li is less than 6Li.
C)  The abundance of 6Li is equal to the abundance of 7Li.
D)  Not enough data is provided to determine the correct answer.
E)  Based on the atomic mass,only 7Li occurs naturally.

Question 15

Which one of the following lists gives the correct symbols for the elements phosphorus,potassium,silver,chlorine,and sulfur?

Accepted Answer

A)  P,Po,Ag,Cl,S
B)  K,Ag,Po,Cl,S
C)  P,K,Ag,Cl,S
D)  Ph,K,Ag,S,Cl
E)  Ph,Po,Ag,Cl,S

Question 16

Which of the following nuclides contains more protons than neutrons?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 17

Which of the following represents a known ion?

Accepted Answer

A)  S2+
B)  Sc4+
C)  Sn2+
D)  P4-
E)  Na-

Question 18

A subatomic particle is

Accepted Answer

A)  a piece of an atom.
B)  only found in the nucleus of an atom.
C)  always positively charged.
D)  larger than the nucleus of an atom.
E)  always negatively charged.

Question 19

The mass spectrum of an element with two naturally occurring isotopes is shown below.What is the best estimate of the element's atomic mass?

Accepted Answer

A)  10 amu
B)  11 amu
C)  10.8 amu
D)  10.2 amu
E)  10.5 amu

Question 20

Which of the following pairs of compounds can be used to illustrate the law of multiple proportions?

Accepted Answer

A)  H2O and HCl
B)  NO and NO2
C)  NH4 and NH4Cl
D)  ZnO2 and ZnCl2
E)  CH4 and CO2

Exam 2: Atoms, molecules, and Ions

What is the formula of calcium nitrite?

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Which one of the following lists gives the correct symbols for the elements phosphorus,potassium,silver,chlorine,and sulfur?

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The correct name for Zn2+ is

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Lithium has two naturally occurring isotopes,6Li and 7Li .The average atomic mass of lithium is 6.941.Which of the following statements concerning the relative abundance of each isotope is correct?

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What is the correct formula for manganese(III) oxide?

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Which of the following is the atomic symbol for the element cobalt?

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Which of the following elements has the largest atomic mass?

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A 2.0-g sample of washing soda,Na2CO3 • 10H2O,has carbon atoms.How many oxygen atoms are present in 2.0g of washing soda?

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Which of the following nuclides contains more protons than neutrons?

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Energy from the following reaction provided the lift for the moon lander: __ (CH3) 2N2H2 + __ N2O4 → __ N2 + __ H2O + __ CO2 When the equation is balanced,the smallest whole-number coefficient of nitrogen is

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The complete combustion of propane,C3H8,yields carbon dioxide and water: - C3 H8 + - O2→ - CO2 + - H2O The smallest whole-number coefficient of oxygen in the balanced equation is

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Which of the following equations is not balanced?

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The formulas of the carbonate ion,the ammonium ion,and the chlorate ion are represented,respectively,as

Correct AnswerverifiedShow Answer

The chemical name for the binary,non-ionic molecule with the formula HI is

Correct AnswerverifiedShow Answer

Which of the following pairs of compounds can be used to illustrate the law of multiple proportions?

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A subatomic particle is

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If the Thomson model of the atom had been correct,Rutherford would have observed

Correct AnswerverifiedShow Answer

The mass spectrum of an element with two naturally occurring isotopes is shown below.What is the best estimate of the element's atomic mass?

Correct AnswerverifiedShow Answer

The formulas of the hydroxide ion,the nitrate ion,and the phosphate ion are represented,respectively,as

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Which of the following represents a known ion?

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The correct name for Zn²⁺ is

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Lithium has two naturally occurring isotopes,⁶Li and ⁷Li .The average atomic mass of lithium is 6.941.Which of the following statements concerning the relative abundance of each isotope is correct?

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A 2.0-g sample of washing soda,Na₂CO₃ • 10H₂O,has carbon atoms.How many oxygen atoms are present in 2.0g of washing soda?

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Energy from the following reaction provided the lift for the moon lander: (CH₃) ₂N₂H₂ + N₂O₄ → N₂ + H₂O + __ CO₂ When the equation is balanced,the smallest whole-number coefficient of nitrogen is

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The complete combustion of propane,C₃H₈,yields carbon dioxide and water: _- C₃H₈+ _- O₂→ _- CO_{2 +}_- H₂O The smallest whole-number coefficient of oxygen in the balanced equation is

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