Question 1

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

Accepted Answer

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

Question 2

What is the symbol for an ion of an element that has 12 protons and 10 electrons?

Accepted Answer

A)  Mg2+ 
B)  Mg2- 
C)  Ne2+ 
D)  Ne2- 
E)  Ti2+ 
A)  Mg2+ 
B)  Mg2- 
C)  Ne2+ 
D)  Ne2- 
E)  Ti2+

Question 3

Which of the following is the correct mass percent of each element in sulfuric acid,H2SO4?

Accepted Answer

A)  2.055% H,32.69% S,and 65.25% O 
B)  1.028% H,32.69% S,and 66.28% O 
C)  28.57% H,14.29% S,and 57.17% O 
D)  1.028% H,33.72% S,and 65.25% O 
E)  2.016% H,32.07% S,and 65.91% O 
A)  2.055% H,32.69% S,and 65.25% O 
B)  1.028% H,32.69% S,and 66.28% O 
C)  28.57% H,14.29% S,and 57.17% O 
D)  1.028% H,33.72% S,and 65.25% O 
E)  2.016% H,32.07% S,and 65.91% O

Question 4

Two isotopes of a given element will have the same number of _____,but a different number of _____ in their nucleus.

Accepted Answer

A)  protons; electrons 
B)  electrons; protons 
C)  protons; neutrons 
D)  neutrons; protons 
E)  electrons; neutrons 
A)  protons; electrons 
B)  electrons; protons 
C)  protons; neutrons 
D)  neutrons; protons 
E)  electrons; neutrons

Question 5

The element chlorine has two stable isotopes,chlorine-35 with an atomic mass of 34.97 u and chlorine-37 with an atomic mass of 36.97 u.From the atomic weight found on the periodic table,one can conclude that _____.

Accepted Answer

A)  both isotopes have the same percent natural abundance 
B)  there is an isotope of nitrogen with an atomic mass of 35.45 u 
C)  chlorine-35 has the highest percent natural abundance 
D)  chlorine-37 has the highest percent natural abundance 
E)  there is an isotope of nitrogen with an atomic mass of 37.95 u 
A)  both isotopes have the same percent natural abundance 
B)  there is an isotope of nitrogen with an atomic mass of 35.45 u 
C)  chlorine-35 has the highest percent natural abundance 
D)  chlorine-37 has the highest percent natural abundance 
E)  there is an isotope of nitrogen with an atomic mass of 37.95 u

Question 6

Which of the following elements is not a metalloid?

Accepted Answer

A)  Boron 
B)  Selenium 
C)  Germanium 
D)  Arsenic 
E)  Silicon 
A)  Boron 
B)  Selenium 
C)  Germanium 
D)  Arsenic 
E)  Silicon

Question 7

Which of the following is the correct formula for calcium nitrate?

Accepted Answer

A)  CaN 
B)  Ca3N2 
C)  CaNO2 
D)  Ca3(NO3)2 
E)  Ca(NO3)2 
A)  CaN 
B)  Ca3N2 
C)  CaNO2 
D)  Ca3(NO3)2 
E)  Ca(NO3)2

Question 8

What is the charge on the sodium ion in Na3P?

Accepted Answer

A)  3- 
B)  1- 
C)  0 
D)  1+ 
E)  3+ 
A)  3- 
B)  1- 
C)  0 
D)  1+ 
E)  3+

Question 9

Which of the following is true about negative ions?

Accepted Answer

A)  Negatively charged ions of the Group 6A elements are called halide ions. 
B)  Negatively charged ions of the Group 1A and 2A elements are called halide ions. 
C)  Polyatomic negative ions containing oxygen are called oxoanions. 
D)  Polyatomic negative ions are very rare. 
E)  Monoatomic negative ions are referred to as oxoanions. 
A)  Negatively charged ions of the Group 6A elements are called halide ions. 
B)  Negatively charged ions of the Group 1A and 2A elements are called halide ions. 
C)  Polyatomic negative ions containing oxygen are called oxoanions. 
D)  Polyatomic negative ions are very rare. 
E)  Monoatomic negative ions are referred to as oxoanions.

Question 10

Elements that have the same number of protons,but differ in their number of neutrons are called _____.

Accepted Answer

The answer of Elements that have the same number of...

Question 11

One atomic mass unit is equal to one-twelfth of the mass of an atom of _____.

Accepted Answer

A)  carbon with six protons and six neutrons 
B)  hydrogen with one proton and one neutron 
C)  oxygen with eight protons and eight neutrons 
D)  sodium with 11 atoms and 12 neutrons 
E)  magnesium with 12 atoms and 12 neutrons 
A)  carbon with six protons and six neutrons 
B)  hydrogen with one proton and one neutron 
C)  oxygen with eight protons and eight neutrons 
D)  sodium with 11 atoms and 12 neutrons 
E)  magnesium with 12 atoms and 12 neutrons

Question 12

The chemical formula for chromium(III)sulfate is _____.

Accepted Answer

A)  CrSO4 
B)  Cr(SO4)3 
C)  Cr2(SO4)3 
D)  Cr2SO4 
E)  Cr3(SO4)2 
A)  CrSO4 
B)  Cr(SO4)3 
C)  Cr2(SO4)3 
D)  Cr2SO4 
E)  Cr3(SO4)2

Question 13

The formula for aluminum fluoride is _____.

Accepted Answer

A)  AlF3 
B)  AlF 
C)  Al2F 
D)  AlF4 
E)  AlF2 
A)  AlF3 
B)  AlF 
C)  Al2F 
D)  AlF4 
E)  AlF2

Question 14

Which ionic compound has the stronger force of attraction between anions and cations: sodium bromide or potassium bromide?

Accepted Answer

The force of attraction is stronger for

Question 15

What mass of aluminum contains the same number of atoms as 3.0 g of lead?

Accepted Answer

A)  23 g 
B)  0.014 g 
C)  3.0 g 
D)  0.39 g 
E)  0.11 g 
A)  23 g 
B)  0.014 g 
C)  3.0 g 
D)  0.39 g 
E)  0.11 g

Question 16

Which of the following is the correct molar mass of calcium chloride hexahydrate?

Accepted Answer

A)  75.53 g/mol 
B)  111.0 g/mol 
C)  117.0 g/mol 
D)  183.6 g/mol 
E)  219.1 g/mol 
A)  75.53 g/mol 
B)  111.0 g/mol 
C)  117.0 g/mol 
D)  183.6 g/mol 
E)  219.1 g/mol

Question 17

Calculate the number of moles of aluminum oxide in 6.83 g of Al2O3.

Accepted Answer

A)  6.70 × 10-2 mol 
B)  6.96 × 102 mol 
C)  0.253 mol 
D)  0.127 mol 
E)  1.56 × 10-3 mol 
A)  6.70 × 10-2 mol 
B)  6.96 × 102 mol 
C)  0.253 mol 
D)  0.127 mol 
E)  1.56 × 10-3 mol

Question 18

Write the names of metalloids present in the periodic table.

Accepted Answer

Boron,silicon,german

Question 19

Which of the following is the correct atomic symbol for an element that has 30 neutrons and a mass number of 55?

Accepted Answer

A)  At 
B)  Zn 
C)  Co 
D)  Mn 
E)  Cs 
A)  At 
B)  Zn 
C)  Co 
D)  Mn 
E)  Cs

Question 20

Scandium(III)sulfite is an ionic compound formed from Sc3+ and SO32-.What is the correct way to represent the formula?

Accepted Answer

A)  ScSO3+ 
B)  Sc(SO3)2- 
C)  Sc3+SO32- 
D)  Sc2(SO3)3 
E)  Sc5(SO3)8 
A)  ScSO3+ 
B)  Sc(SO3)2- 
C)  Sc3+SO32- 
D)  Sc2(SO3)3 
E)  Sc5(SO3)8

Exam 3: Atoms, molecules, and Ions

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

What is the symbol for an ion of an element that has 12 protons and 10 electrons?

Which of the following is the correct mass percent of each element in sulfuric acid,H2SO4?

Two isotopes of a given element will have the same number of _____,but a different number of _____ in their nucleus.

The element chlorine has two stable isotopes,chlorine-35 with an atomic mass of 34.97 u and chlorine-37 with an atomic mass of 36.97 u.From the atomic weight found on the periodic table,one can conclude that _____.

Which of the following elements is not a metalloid?

Which of the following is the correct formula for calcium nitrate?

What is the charge on the sodium ion in Na3P?

Which of the following is true about negative ions?

Elements that have the same number of protons,but differ in their number of neutrons are called _____.

One atomic mass unit is equal to one-twelfth of the mass of an atom of _____.

The chemical formula for chromium(III)sulfate is _____.

The formula for aluminum fluoride is _____.

Which ionic compound has the stronger force of attraction between anions and cations: sodium bromide or potassium bromide?

What mass of aluminum contains the same number of atoms as 3.0 g of lead?

Which of the following is the correct molar mass of calcium chloride hexahydrate?

Calculate the number of moles of aluminum oxide in 6.83 g of Al2O3.

Write the names of metalloids present in the periodic table.

Which of the following is the correct atomic symbol for an element that has 30 neutrons and a mass number of 55?

Scandium(III)sulfite is an ionic compound formed from Sc3+ and SO32-.What is the correct way to represent the formula?

Basic Concepts of Chemistry

Lets Review: The Tools of Quantitative Chemistry

Chemical Reactions

Stoichiometry: Quantitative Information About Chemical Reactions

Principles of Chemical Reactivity: Energy and Chemical Reactions

The Structure of Atoms

The Structure of Atoms and Periodic Trends

Bonding and Molecular Structure

Bonding and Molecular Structure Orbital Hybridization and Molecular Orbitals

Gases and Their Properties

Intermolecular Forces and Liquids

The Solid State

Solutions and Their Behavior

Chemical Kinetics: the Rates of Chemical Reactions

Principles of Chemical Reactivity: Equilibria

Principles of Chemical Reactivity: the Chemistry of Acids and Bases

Principles of Chemical Reactivity: Other Aspects of Aqueous Equilibria

Principles of Chemical Reactivity: Entropy and Free Energy

Principles of Chemical Reactivity: Electron Transfer Reactions

Environmental Chemistry: Earths Environment, energy, and Sustainability

The Chemistry of the Main Group Elements

The Chemistry of the Transition Elements

Carbon: Not Just Another Element

Biochemistry

Nuclear Chemistry

Filters

Which of the following is the correct mass percent of each element in sulfuric acid,H₂SO₄?

Two isotopes of a given element will have the same number of _,but a different number of _ in their nucleus.

What is the charge on the sodium ion in Na₃P?

Calculate the number of moles of aluminum oxide in 6.83 g of Al₂O₃.

Scandium(III)sulfite is an ionic compound formed from Sc³⁺ and SO₃^2-.What is the correct way to represent the formula?