Question 1

Which of the following symbols indicates an atom or ion with 12 protons and 10 electrons?

Accepted Answer

A)  Mg2+ 
B)  C4+ 
C)  O2- 
D)  Ne 
E)  none of these 
A)  Mg2+ 
B)  C4+ 
C)  O2- 
D)  Ne 
E)  none of these A

Question 2

All of the following have the same number of electrons except:

Accepted Answer

A)  K+ 
B)  Ca2+ 
C)  Al3+ 
D)  S2- 
E)  Cl- 
A)  K+ 
B)  Ca2+ 
C)  Al3+ 
D)  S2- 
E)  Cl- C

Question 3

use the data listed below.

-If you were able to select a single atom of oxygen from a naturally occurring sample, what would its mass most likely be?

Accepted Answer

A)  15.9949 amu 
B)  16.9991 amu 
C)  17.9992 amu 
D)  15.9993 amu 
E)  none of these 
A)  15.9949 amu 
B)  16.9991 amu 
C)  17.9992 amu 
D)  15.9993 amu 
E)  none of these A

Question 4

Calculate the number of protons in the average potassium atom if the atomic weight of potassium is 39 amu and the atomic number of this element is 19.

Accepted Answer

A)  19 
B)  20 
C)  39 
D)  58 
E)  The number of protons is impossible to determine from this information. 
A)  19 
B)  20 
C)  39 
D)  58 
E)  The number of protons is impossible to determine from this information.

Question 5

Calculate the sum of the coefficients in the balanced chemical equation for the following reaction:
A H2S(g) + B O2(g)  $\rightarrow$  C SO2(g) + D H2O(g)

Accepted Answer

A)  6 
B)  8 
C)  9 
D)  11 
E)  17 
A)  6 
B)  8 
C)  9 
D)  11 
E)  17

Question 6

Complete the following table

Accepted Answer

19, 9, 10,

Question 7

The earth is constantly bombarded by cosmic rays emitted by the sun. The total energy received in the form of cosmic rays is small - no more than the energy received by the planet from starlight. But the energy of a single cosmic ray is very large, on the order of 200 million kJ/mol. These highly energetic rays react with atoms in the atmosphere to produce neutrons that then react with nitrogen atoms in the atmosphere to produce 14C, which decays back to 14N with a half-life of 5730 years by emitting an electron.
What is the difference between 14C and 14N atoms?

Accepted Answer

A)  They have the same number of protons but different numbers of neutrons. 
B)  They have the same number of neutrons but different numbers of protons. 
C)  They have the same number of neutrons and protons but different numbers of electrons. 
D)  14N has one more proton and one less neutron than 14C. 
E)  14N has one more neutron and one less proton than 14C. 
A)  They have the same number of protons but different numbers of neutrons. 
B)  They have the same number of neutrons but different numbers of protons. 
C)  They have the same number of neutrons and protons but different numbers of electrons. 
D)  14N has one more proton and one less neutron than 14C. 
E)  14N has one more neutron and one less proton than 14C.

Question 8

What is the sum of the coefficients when the following chemical equation is balanced?
A Ca3(PO4)2(s) + B C(s)  $\rightarrow$ C Ca3P2(s) + D CO(g)

Accepted Answer

A)  6 
B)  12 
C)  18 
D)  20 
E)  none of the above 
A)  6 
B)  12 
C)  18 
D)  20 
E)  none of the above

Question 9

Which of the following compounds is composed only of polyatomic ions?

Accepted Answer

A)  NH4NO3 
B)  CaO 
C)  H2SO4 
D)  NO2 
E)  CO2 
A)  NH4NO3 
B)  CaO 
C)  H2SO4 
D)  NO2 
E)  CO2

Question 10

Describe the difference on the atomic scale between the following three forms of oxygen:
O, O2, O2 - .

Accepted Answer

O represents an atom of oxygen containin

Question 11

Which of the following atoms have the same number of neutrons?
(I) 233Th (II) 235U (III) 238U (IV) 238Np

Accepted Answer

A)  I and II 
B)  I, II and IV 
C)  II and III 
D)  III and IV 
E)  All of these atoms have the same number of neutrons. 
A)  I and II 
B)  I, II and IV 
C)  II and III 
D)  III and IV 
E)  All of these atoms have the same number of neutrons.

Question 12

Which of the following elements is neither a metal nor a nonmetal?

Accepted Answer

A)  Na 
B)  Mg 
C)  Ga 
D)  Si 
E)  P 
A)  Na 
B)  Mg 
C)  Ga 
D)  Si 
E)  P

Question 13

The balanced equation for the decomposition of ammonium dichromate has which of the following sets of coefficients?
A (NH4)2Cr2O7(s)  $\rightarrow$ B Cr2O3(s) + C N2(g) + D H2O(g)

Accepted Answer

A)  A = 2, B = 2, C = 2, D = 4 
B)  A = 1, B = 1, C = 1, D = 4 
C)  A = 1, B = 1, C = 1, D = 2 
D)  A = 1, B = 1, C = 2, D = 2 
E)  A = B = C = D = 1 
A)  A = 2, B = 2, C = 2, D = 4 
B)  A = 1, B = 1, C = 1, D = 4 
C)  A = 1, B = 1, C = 1, D = 2 
D)  A = 1, B = 1, C = 2, D = 2 
E)  A = B = C = D = 1

Question 14

Balance the following equations: 
(I) Na2SO4(s) + C(s)  $\rightarrow$  Na2S(aq) + CO2(g)
(II) Mg3N2(s) + H2O(l)  $\rightarrow$ Mg(OH)2(aq) + NH3(g)

Accepted Answer

(I) Na₂SO₄

Question 15

Which of the following postulates of Dalton's atomic theory is/are still valid today?
(I) Matter consists of particles called atoms.
(II) Atoms are indestructible and indivisible.
(III) All atoms of an element are identical.
(IV) Atoms of different elements differ in mass.
(V) When the atoms of different elements combine to form compounds they combine in simple whole number ratios.

Accepted Answer

A)  All of these statements are still valid today. 
B)  I and II are still valid, but not III, IV and V. 
C)  I, II and III are still valid, but not IV and V. 
D)  I, IV and V are still valid, but not II and III. 
E)  II and III are still valid, but not I, IV and V. 
A)  All of these statements are still valid today. 
B)  I and II are still valid, but not III, IV and V. 
C)  I, II and III are still valid, but not IV and V. 
D)  I, IV and V are still valid, but not II and III. 
E)  II and III are still valid, but not I, IV and V.

Question 16

Which of the following is a nonmetal in period 4?

Accepted Answer

A)  C 
B)  Ca 
C)  Se 
D)  Sr 
E)  none of these 
A)  C 
B)  Ca 
C)  Se 
D)  Sr 
E)  none of these

Question 17

Which statement correctly describes the difference between the 12C, 13C and 14C isotopes of carbon?

Accepted Answer

A)  They have the same number of protons but different numbers of electrons. 
B)  They have the same number of neutrons but different numbers of electrons. 
C)  They have the same number of electrons but different numbers of protons. 
D)  They have the same number of protons but different numbers of neutrons. 
E)  They have the same number of protons, electrons, and neutrons but
Different atomic masses. 
A)  They have the same number of protons but different numbers of electrons. 
B)  They have the same number of neutrons but different numbers of electrons. 
C)  They have the same number of electrons but different numbers of protons. 
D)  They have the same number of protons but different numbers of neutrons. 
E)  They have the same number of protons, electrons, and neutrons but
Different atomic masses.

Question 18

Which choice gives the diagrams in the order that best represents 2O2, 4O, and X3, respectively?

Accepted Answer

A)  A B C 
B)  C B A 
C)  B C A 
D)  B A C 
E)  None of the above gives the cartoons in the correct order. 
A)  A B C 
B)  C B A 
C)  B C A 
D)  B A C 
E)  None of the above gives the cartoons in the correct order.

Question 19

Which illustration best represents the following equation?

Accepted Answer

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

Question 20

What will be the coefficient for oxygen when the following equation is balanced?
C3H8(g) + O2(g)  $\rightarrow$ CO2(g) + H2O(g)

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  5 
E)  none of these 
A)  1 
B)  2 
C)  3 
D)  5 
E)  none of these

Which of the following symbols indicates an atom or ion with 12 protons and 10 electrons?

All of the following have the same number of electrons except:

use the data listed below. -If you were able to select a single atom of oxygen from a naturally occurring sample, what would its mass most likely be?

Calculate the number of protons in the average potassium atom if the atomic weight of potassium is 39 amu and the atomic number of this element is 19.

Calculate the sum of the coefficients in the balanced chemical equation for the following reaction: A H₂S(g) + B O₂(g) $\rightarrow$ C SO₂(g) + D H₂O(g)

Complete the following table

What is the sum of the coefficients when the following chemical equation is balanced? A Ca₃(PO₄)₂(s) + B C(s) $\rightarrow$ C Ca₃P₂(s) + D CO(g)

Which of the following compounds is composed only of polyatomic ions?

Describe the difference on the atomic scale between the following three forms of oxygen: O, O₂, O² ^- .

Which of the following atoms have the same number of neutrons? (I) ²³³Th (II) ²³⁵U (III) ²³⁸U (IV) ²³⁸Np

Which of the following elements is neither a metal nor a nonmetal?

The balanced equation for the decomposition of ammonium dichromate has which of the following sets of coefficients? A (NH₄)₂Cr₂O₇(s) $\rightarrow$ B Cr₂O₃(s) + C N₂(g) + D H₂O(g)

Balance the following equations: (I) Na₂SO₄(s) + C(s) $\rightarrow$ Na₂S(aq) + CO₂(g) (II) Mg₃N₂(s) + H₂O(l) $\rightarrow$ Mg(OH)₂(aq) + NH₃(g)

Which of the following is a nonmetal in period 4?

Which statement correctly describes the difference between the ¹²C, ¹³C and ¹⁴C isotopes of carbon?

Which choice gives the diagrams in the order that best represents 2O₂, 4O, and X₃,respectively?

Which illustration best represents the following equation?

What will be the coefficient for oxygen when the following equation is balanced? C₃H₈(g) + O₂(g) $\rightarrow$ CO₂(g) + H₂O(g)

The Mole

Structure of the Atom

The Covalent Bond

Ionic and Metallic Bonds

Gases

Making and Breaking of Bonds

Liquids and Solutions

Solids

An Introduction to Kinetics and Equilibrium

Acids and Bases

Oxidation-Reduction Reactions

Chemical Thermodynamics

Kinetics

Nuclear Chemistry

Organic Chemistry

Filters

Exam 1: Elements Compounds

Which of the following symbols indicates an atom or ion with 12 protons and 10 electrons?

All of the following have the same number of electrons except:

use the data listed below. -If you were able to select a single atom of oxygen from a naturally occurring sample, what would its mass most likely be?

Calculate the number of protons in the average potassium atom if the atomic weight of potassium is 39 amu and the atomic number of this element is 19.

Calculate the sum of the coefficients in the balanced chemical equation for the following reaction: A H2S(g) + B O2(g) →\rightarrow→ C SO2(g) + D H2O(g)

Complete the following table

What is the sum of the coefficients when the following chemical equation is balanced? A Ca3(PO4)2(s) + B C(s) →\rightarrow→ C Ca3P2(s) + D CO(g)

Which of the following compounds is composed only of polyatomic ions?

Describe the difference on the atomic scale between the following three forms of oxygen: O, O2, O2 - .

Which of the following atoms have the same number of neutrons? (I) 233Th (II) 235U (III) 238U (IV) 238Np

Which of the following elements is neither a metal nor a nonmetal?

The balanced equation for the decomposition of ammonium dichromate has which of the following sets of coefficients? A (NH4)2Cr2O7(s) →\rightarrow→ B Cr2O3(s) + C N2(g) + D H2O(g)

Balance the following equations: (I) Na2SO4(s) + C(s) →\rightarrow→ Na2S(aq) + CO2(g) (II) Mg3N2(s) + H2O(l) →\rightarrow→ Mg(OH)2(aq) + NH3(g)

Which of the following is a nonmetal in period 4?

Which statement correctly describes the difference between the 12C, 13C and 14C isotopes of carbon?

Which choice gives the diagrams in the order that best represents 2O2, 4O, and X3, respectively?

Which illustration best represents the following equation?

What will be the coefficient for oxygen when the following equation is balanced? C3H8(g) + O2(g) →\rightarrow→ CO2(g) + H2O(g)

The Mole

Structure of the Atom

The Covalent Bond

Ionic and Metallic Bonds

Gases

Making and Breaking of Bonds

Liquids and Solutions

Solids

An Introduction to Kinetics and Equilibrium

Acids and Bases

Oxidation-Reduction Reactions

Chemical Thermodynamics

Kinetics

Nuclear Chemistry

Organic Chemistry

Filters

Calculate the sum of the coefficients in the balanced chemical equation for the following reaction: A H₂S(g) + B O₂(g) $\rightarrow$ C SO₂(g) + D H₂O(g)

What is the sum of the coefficients when the following chemical equation is balanced? A Ca₃(PO₄)₂(s) + B C(s) $\rightarrow$ C Ca₃P₂(s) + D CO(g)

Describe the difference on the atomic scale between the following three forms of oxygen: O, O₂, O² ^- .

Which of the following atoms have the same number of neutrons? (I) ²³³Th (II) ²³⁵U (III) ²³⁸U (IV) ²³⁸Np

The balanced equation for the decomposition of ammonium dichromate has which of the following sets of coefficients? A (NH₄)₂Cr₂O₇(s) $\rightarrow$ B Cr₂O₃(s) + C N₂(g) + D H₂O(g)

Balance the following equations: (I) Na₂SO₄(s) + C(s) $\rightarrow$ Na₂S(aq) + CO₂(g) (II) Mg₃N₂(s) + H₂O(l) $\rightarrow$ Mg(OH)₂(aq) + NH₃(g)

Which statement correctly describes the difference between the ¹²C, ¹³C and ¹⁴C isotopes of carbon?

Which choice gives the diagrams in the order that best represents 2O₂, 4O, and X₃,respectively?

What will be the coefficient for oxygen when the following equation is balanced? C₃H₈(g) + O₂(g) $\rightarrow$ CO₂(g) + H₂O(g)