Question 1

What is the mass of 8.04 $\times$ 10-3 mol O2?

Accepted Answer

A)  2.51 $\times$ 10-4 g 
B)  5.03 $\times$ 10-4 g 
C)  0.129 g 
D)  3.89 g 
E)  0.257 g 
A)  2.51 $\times$ 10-4 g 
B)  5.03 $\times$ 10-4 g 
C)  0.129 g 
D)  3.89 g 
E)  0.257 g

Question 2

What is the symbol for an ion of an element which has 56 protons and 54 electrons.

Accepted Answer

A)  Ba2+ 
B)  Ba2- 
C)  Xe2+ 
D)  Xe2- 
E)  Ds2+ 
A)  Ba2+ 
B)  Ba2- 
C)  Xe2+ 
D)  Xe2- 
E)  Ds2+

Question 3

A neutral atom of the isotope 197Au contains

Accepted Answer

A)  197 neutrons and 276 electrons. 
B)  79 protons and 197 neutrons. 
C)  197 protons and 118 electrons. 
D)  197 protons,79 neutrons,and 197 electrons. 
E)  79 protons and 118 neutrons. 
A)  197 neutrons and 276 electrons. 
B)  79 protons and 197 neutrons. 
C)  197 protons and 118 electrons. 
D)  197 protons,79 neutrons,and 197 electrons. 
E)  79 protons and 118 neutrons.

Question 4

Which element is most likely to form a 2- ion?

Accepted Answer

A)  K 
B)  Mg 
C)  P 
D)  Br 
E)  S 
A)  K 
B)  Mg 
C)  P 
D)  Br 
E)  S

Question 5

In reactions,metals generally lose electrons to become ________,and nonmetals gain electrons to become anions.

Accepted Answer

The answer of In reactions,metals generally lose electrons to become...

Question 6

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 7

A sample of an element consists of two isotopes.The percent abundance of one of the isotopes is 54.0%.What is the percent abundance of the other isotope?

Accepted Answer

A)  31.0 
B)  27.0 
C)  23.0 
D)  54.0 
E)  46.0 
A)  31.0 
B)  27.0 
C)  23.0 
D)  54.0 
E)  46.0

Question 8

What halogen is in the third period?

Accepted Answer

A)  S 
B)  Cl2 
C)  I2 
D)  H2 
E)  Ar 
A)  S 
B)  Cl2 
C)  I2 
D)  H2 
E)  Ar

Question 9

What is the common name for PH3?

Accepted Answer

A)  laughing gas 
B)  hydrazine 
C)  nitroglycerin 
D)  ammonia 
E)  phosphine 
A)  laughing gas 
B)  hydrazine 
C)  nitroglycerin 
D)  ammonia 
E)  phosphine

Question 10

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 11

What is the correct name for NH4NO3?

Accepted Answer

A)  ammonia hydrogen nitrate 
B)  ammonia hydrogen nitride 
C)  ammonium nitric acid 
D)  ammonium nitrate 
E)  ammonium nitride 
A)  ammonia hydrogen nitrate 
B)  ammonia hydrogen nitride 
C)  ammonium nitric acid 
D)  ammonium nitrate 
E)  ammonium nitride

Question 12

What is the charge on the copper ion in Ga3P?

Accepted Answer

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

Question 13

A 0.0050 g sample of boron contains ____ B atoms.

Accepted Answer

A)  4.6 $\times$ 10-4 
B)  7.7 $\times$ 10-28 
C)  2.8 $\times$ 1020 
D)  3.1 $\times$ 1021 
E)  3.3 $\times$ 1022 
A)  4.6 $\times$ 10-4 
B)  7.7 $\times$ 10-28 
C)  2.8 $\times$ 1020 
D)  3.1 $\times$ 1021 
E)  3.3 $\times$ 1022

Question 14

Identify the ions present in Na2SO4.

Accepted Answer

A)  Na+,S2-,and O2-. 
B)  Na+,S2+,and O2- 
C)  Na+ and SO42- 
D)  Na+,S2-,and O2+ . 
A)  Na+,S2-,and O2-. 
B)  Na+,S2+,and O2- 
C)  Na+ and SO42- 
D)  Na+,S2-,and O2+ .

Question 15

Which of the following statements concerning ionic compounds is/are correct?
1)As ion charges increase,the attraction between oppositely charged ions increases.
2)Although not electrically conductive like metals,ionic compounds are malleable.
3)Positive and negative ions are attracted to each other by electrostatic forces.

Accepted Answer

A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 3 
E)  1,2,and 3 
A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 3 
E)  1,2,and 3

Question 16

You have 2.50 g of each of the following elements: Ca,Cu,Cs,C,and Cr.Which sample contains the largest number of atoms?

Accepted Answer

A)  Ca 
B)  Cu 
C)  Cs 
D)  C 
E)  Cr 
A)  Ca 
B)  Cu 
C)  Cs 
D)  C 
E)  Cr

Question 17

Which of the following statements is true concerning   and  
?

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 18

How many hydrogen atoms are present in 1.0 g of NH3?

Accepted Answer

A)  0.059 atoms 
B)  0.18 atoms 
C)  3.5 $\times$ 1022 atoms 
D)  1.1 $\times$ 1023 atoms 
E)  1.2 $\times$ 1022 atoms 
A)  0.059 atoms 
B)  0.18 atoms 
C)  3.5 $\times$ 1022 atoms 
D)  1.1 $\times$ 1023 atoms 
E)  1.2 $\times$ 1022 atoms

Question 19

Atomic number is the________ in the nucleus of an atom.

Accepted Answer

A)  number of electrons 
B)  number of protons 
C)  number of protons minus the number of neutrons 
D)  sum of the number of electrons and neutrons 
E)  sum of the number of neutrons and protons 
A)  number of electrons 
B)  number of protons 
C)  number of protons minus the number of neutrons 
D)  sum of the number of electrons and neutrons 
E)  sum of the number of neutrons and protons

Question 20

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

Accepted Answer

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

Exam 3: Atoms, molecules, and Ions

What is the mass of 8.04 ×\times× 10-3 mol O2?

What is the symbol for an ion of an element which has 56 protons and 54 electrons.

A neutral atom of the isotope 197Au contains

Which element is most likely to form a 2- ion?

In reactions,metals generally lose electrons to become ________,and nonmetals gain electrons to become anions.

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?

A sample of an element consists of two isotopes.The percent abundance of one of the isotopes is 54.0%.What is the percent abundance of the other isotope?

What halogen is in the third period?

What is the common name for PH3?

Which of the following elements is not a metalloid?

What is the correct name for NH4NO3?

What is the charge on the copper ion in Ga3P?

A 0.0050 g sample of boron contains ____ B atoms.

Identify the ions present in Na2SO4.

You have 2.50 g of each of the following elements: Ca,Cu,Cs,C,and Cr.Which sample contains the largest number of atoms?

Which of the following statements is true concerning and ?

How many hydrogen atoms are present in 1.0 g of NH3?

Atomic number is the________ in the nucleus of an atom.

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

Basic Concepts of Chemistry

Mathlets 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 Chemistry of Solids

Solutions and Their Behavior

Chemical Kinetics: the Rates of Chemical Reactions

Principles of Reactivity: Chemical Equilibria

The Chemistry of Acids and Bases

Principles of Reactivity: Other Aspects of Aqueous Equilibria

Entropy and Free Energy

Principles of 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

What is the mass of 8.04 $\times$ 10^-3 mol O₂?

A neutral atom of the isotope ¹⁹⁷Au contains

What is the common name for PH₃?

What is the correct name for NH₄NO₃?

What is the charge on the copper ion in Ga₃P?

Identify the ions present in Na₂SO₄.

How many hydrogen atoms are present in 1.0 g of NH₃?

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