Question 1

All of the following are SI base units of measurement,EXCEPT

Accepted Answer

A)  meter. 
B)  gram. 
C)  second. 
D)  kelvin. 
E)  mole. 
A)  meter. 
B)  gram. 
C)  second. 
D)  kelvin. 
E)  mole.

Question 2

Which of the following statements about isotopes is TRUE?

Accepted Answer

A)  Isotopes of the same element differ only in the number of electrons they contain. 
B)  An isotope of an atom with a larger number of neutrons is larger than an isotope of the same atom that contains fewer neutrons. 
C)  Isotopes of the same element have the same mass. 
D)  Isotopes of the same element don't usually have the same properties. 
E)  Some elements have 3 or more naturally occurring isotopes. 
A)  Isotopes of the same element differ only in the number of electrons they contain. 
B)  An isotope of an atom with a larger number of neutrons is larger than an isotope of the same atom that contains fewer neutrons. 
C)  Isotopes of the same element have the same mass. 
D)  Isotopes of the same element don't usually have the same properties. 
E)  Some elements have 3 or more naturally occurring isotopes.

Question 3

How many atoms of oxygen are in 2.50 moles of SO2?

Accepted Answer

A)  4.52 × 1024 atoms 
B)  1.51 × 1024 atoms 
C)  5.02 × 1023 atoms 
D)  3.01 × 1024 atoms 
E)  7.53 × 1023 atoms 
A)  4.52 × 1024 atoms 
B)  1.51 × 1024 atoms 
C)  5.02 × 1023 atoms 
D)  3.01 × 1024 atoms 
E)  7.53 × 1023 atoms

Question 4

How many electrons are in a neutral atom of astatine-211?

Accepted Answer

A)  1 
B)  85 
C)  86 
D)  211 
A)  1 
B)  85 
C)  86 
D)  211

Question 5

Calculate the mass (in ng)of 2.33 × 1020 atoms of oxygen.

Accepted Answer

A)  6.19 × 106 ng 
B)  1.62 × 107 ng 
C)  2.25 × 103 ng 
D)  3.73 × 106 ng 
E)  4.69 × 107 ng 
A)  6.19 × 106 ng 
B)  1.62 × 107 ng 
C)  2.25 × 103 ng 
D)  3.73 × 106 ng 
E)  4.69 × 107 ng

Question 6

Ions differ from atoms in their number of

Accepted Answer

A)  electrons. 
B)  neutrons. 
C)  protons. 
D)  neutrons and protons. 
E)  electrons and protons. 
A)  electrons. 
B)  neutrons. 
C)  protons. 
D)  neutrons and protons. 
E)  electrons and protons.

Question 7

Rutherford's Gold Foil Experiment helped prove

Accepted Answer

A)  the diameter of a gold atom. 
B)  the exact charge of an electrons. 
C)  the exact mass of a gold atom. 
D)  that the mass of an atom is concentrated in a very small space. 
E)  the mass to charge ratio of an electron. 
A)  the diameter of a gold atom. 
B)  the exact charge of an electrons. 
C)  the exact mass of a gold atom. 
D)  that the mass of an atom is concentrated in a very small space. 
E)  the mass to charge ratio of an electron.

Question 8

What element is defined by the following information?
P+ = 20 n° = 20 e- = 20

Accepted Answer

A)  zirconium 
B)  calcium 
C)  potassium 
D)  neon 
E)  argon 
A)  zirconium 
B)  calcium 
C)  potassium 
D)  neon 
E)  argon

Question 9

What does "X" represent in the following symbol?   X

Accepted Answer

A)  mercury 
B)  chlorine 
C)  scandium 
D)  bromine 
E)  selenium 
A)  mercury 
B)  chlorine 
C)  scandium 
D)  bromine 
E)  selenium

Question 10

Molecules can be described as

Accepted Answer

A)  mixtures of two or more pure substances. 
B)  mixtures of two or more elements that has a specific ratio between components. 
C)  two or more atoms chemically joined together. 
D)  heterogeneous mixtures. 
E)  homogeneous mixtures. 
A)  mixtures of two or more pure substances. 
B)  mixtures of two or more elements that has a specific ratio between components. 
C)  two or more atoms chemically joined together. 
D)  heterogeneous mixtures. 
E)  homogeneous mixtures.

Question 11

Rank in the order of increasing mass.

Accepted Answer

A)  proton, neutron, electron 
B)  neutron, proton, electron 
C)  electron, proton, neutron 
D)  electron, neutron, proton 
E)  proton, electron, neutron 
A)  proton, neutron, electron 
B)  neutron, proton, electron 
C)  electron, proton, neutron 
D)  electron, neutron, proton 
E)  proton, electron, neutron

Question 12

An element has three stable isotopes with masses of 27.977 amu,28.976 amu,and 29.973 amu.The heavier two isotopes have an abundance of 4.68% and 3.09%,respectively.What is the mass of the element?

Accepted Answer

A)  27.684 amu 
B)  29.251 amu 
C)  28.085 amu 
D)  30.107 amu 
E)  28.991 amu 
A)  27.684 amu 
B)  29.251 amu 
C)  28.085 amu 
D)  30.107 amu 
E)  28.991 amu

Question 13

How many electrons are in titanium?

Accepted Answer

A)  22 
B)  25 
C)  26 
D)  25.9 
E)  47.9 
A)  22 
B)  25 
C)  26 
D)  25.9 
E)  47.9

Question 14

A scientific law

Accepted Answer

A)  is a brief statement that summarizes past observations and makes predictions. 
B)  is subject to change via legal action. 
C)  contains an explanation of observations. 
D)  must have a mathematical formula. 
E)  cannot be modified. 
A)  is a brief statement that summarizes past observations and makes predictions. 
B)  is subject to change via legal action. 
C)  contains an explanation of observations. 
D)  must have a mathematical formula. 
E)  cannot be modified.

Question 15

What does "X" represent in the following symbol?   X

Accepted Answer

A)  silicon 
B)  sulfur 
C)  zinc 
D)  ruthenium 
E)  nickel 
A)  silicon 
B)  sulfur 
C)  zinc 
D)  ruthenium 
E)  nickel

Question 16

A sample of liquid isopropyl alcohol is placed in a sealed container.Some of the volatile isopropyl alcohol vaporizes.Does the mass of the sealed container and its contents change during the vaporization?
 Explain.

Accepted Answer

No.The vaporized isopropyl alcohol is ju

Question 17

How many atoms of carbon are in 2.50 moles of CO2?

Accepted Answer

A)  4.52 × 1024 atoms 
B)  1.51 × 1024 atoms 
C)  5.02 × 1023 atoms 
D)  3.01 × 1024 atoms 
E)  7.53 × 1023 atoms 
A)  4.52 × 1024 atoms 
B)  1.51 × 1024 atoms 
C)  5.02 × 1023 atoms 
D)  3.01 × 1024 atoms 
E)  7.53 × 1023 atoms

Question 18

The atomic mass for silver is

Accepted Answer

A)  28.09 
B)  14 
C)  107.87 
D)  47 
A)  28.09 
B)  14 
C)  107.87 
D)  47

Question 19

Identify the charges of the protons,neutrons,and electrons.

Accepted Answer

A)  protons +1, neutrons 0, electrons -1 
B)  protons 0, neutrons -1, electrons +1 
C)  protons -1, neutrons 0, electrons +1 
D)  protons 0, neutrons +1, electrons -1 
E)  protons +1, neutrons -1, electrons 0 
A)  protons +1, neutrons 0, electrons -1 
B)  protons 0, neutrons -1, electrons +1 
C)  protons -1, neutrons 0, electrons +1 
D)  protons 0, neutrons +1, electrons -1 
E)  protons +1, neutrons -1, electrons 0

Question 20

Choose the element from the list below.

Accepted Answer

A)  sodium chloride 
B)  water 
C)  carbon monoxide 
D)  argon 
E)  rust 
A)  sodium chloride 
B)  water 
C)  carbon monoxide 
D)  argon 
E)  rust

Exam 2: Atoms

All of the following are SI base units of measurement,EXCEPT

Which of the following statements about isotopes is TRUE?

How many atoms of oxygen are in 2.50 moles of SO2?

How many electrons are in a neutral atom of astatine-211?

Calculate the mass (in ng)of 2.33 × 1020 atoms of oxygen.

Ions differ from atoms in their number of

Rutherford's Gold Foil Experiment helped prove

What element is defined by the following information? P+ = 20 n° = 20 e- = 20

What does "X" represent in the following symbol? X

Molecules can be described as

Rank in the order of increasing mass.

An element has three stable isotopes with masses of 27.977 amu,28.976 amu,and 29.973 amu.The heavier two isotopes have an abundance of 4.68% and 3.09%,respectively.What is the mass of the element?

How many electrons are in titanium?

A scientific law

What does "X" represent in the following symbol? X

A sample of liquid isopropyl alcohol is placed in a sealed container.Some of the volatile isopropyl alcohol vaporizes.Does the mass of the sealed container and its contents change during the vaporization? Explain.

How many atoms of carbon are in 2.50 moles of CO2?

The atomic mass for silver is

Identify the charges of the protons,neutrons,and electrons.

Choose the element from the list below.

Essentials: Units, Measurements, and Problem Solving

The Quantum Mechanical Model of the Atom

Periodic Properties of the Elements

Molecules and Compounds

Chemical Bonding I

Chemical Bonding Ii

Chemical Reactions and Chemical Quantities

Introduction to Solutions and Aqueous Reactions

Thermochemistry

Gases

Liquids, Solids, and Intermolecular Forces

Crystalline Solids and Modern Materials

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry

Transition Metals and Coordination Compounds

Filters

How many atoms of oxygen are in 2.50 moles of SO₂?

Calculate the mass (in ng)of 2.33 × 10²⁰atoms of oxygen.

What element is defined by the following information? P⁺ = 20 n° = 20 e^- = 20

How many atoms of carbon are in 2.50 moles of CO₂?