Question 1

Why doesn't the mass spectrum of silver have a peak at 107.9 amu?

Accepted Answer

The average atomic mass of sil

Question 2

All samples of a given compound,regardless of their source or how they were prepared,have the same proportions of their constituent elements.Which law does this refer to?

Accepted Answer

A)  Law of Definite Proportions 
B)  Law of the Conservation of Mass 
C)  Law of Modern Atomic Theory 
D)  Law of Multiple Proportions 
E)  First Law of Thermodynamics 
A)  Law of Definite Proportions 
B)  Law of the Conservation of Mass 
C)  Law of Modern Atomic Theory 
D)  Law of Multiple Proportions 
E)  First Law of Thermodynamics

Question 3

Give the composition of water.

Accepted Answer

A)  two hydrogen atoms and two oxygen atoms 
B)  one hydrogen atom and one oxygen atom 
C)  two hydrogen atoms and one oxygen atom 
D)  one hydrogen atom and two oxygen atoms 
A)  two hydrogen atoms and two oxygen atoms 
B)  one hydrogen atom and one oxygen atom 
C)  two hydrogen atoms and one oxygen atom 
D)  one hydrogen atom and two oxygen atoms

Question 4

Which of the following statements about the phases of matter is TRUE?

Accepted Answer

A)  In both solids and liquids, the atoms or molecules pack closely to one another. 
B)  Solids are highly compressible. 
C)  Gaseous substances have long-range repeating order. 
D)  There is only one type of geometric arrangement that the atoms or molecules in any solid can adopt. 
E)  Liquids have a large portion of empty volume between molecules. 
A)  In both solids and liquids, the atoms or molecules pack closely to one another. 
B)  Solids are highly compressible. 
C)  Gaseous substances have long-range repeating order. 
D)  There is only one type of geometric arrangement that the atoms or molecules in any solid can adopt. 
E)  Liquids have a large portion of empty volume between molecules.

Question 5

A wooden baseball bat is an example of

Accepted Answer

A)  a compound. 
B)  an element. 
C)  a heterogeneous mixture. 
D)  a homogeneous mixture. 
A)  a compound. 
B)  an element. 
C)  a heterogeneous mixture. 
D)  a homogeneous mixture.

Question 6

Iodine is an example of

Accepted Answer

A)  a compound. 
B)  an element. 
C)  a heterogeneous mixture. 
D)  a homogeneous mixture. 
A)  a compound. 
B)  an element. 
C)  a heterogeneous mixture. 
D)  a homogeneous mixture.

Question 7

The number 6.022 × 1023 is called ________.

Accepted Answer

Question 8

Identify the description of an atom.

Accepted Answer

A)  neutrons and electrons in nucleus; protons in orbitals 
B)  neutrons in nucleus; protons and electrons in orbitals 
C)  protons and neutrons in nucleus; electrons in orbitals 
D)  protons and electrons in nucleus; neutrons in orbitals 
E)  electrons in nucleus; protons and neutrons in orbitals 
A)  neutrons and electrons in nucleus; protons in orbitals 
B)  neutrons in nucleus; protons and electrons in orbitals 
C)  protons and neutrons in nucleus; electrons in orbitals 
D)  protons and electrons in nucleus; neutrons in orbitals 
E)  electrons in nucleus; protons and neutrons in orbitals

Question 9

An atom that has an atomic number of 38 and a mass number of 88 is an isotope of an atom that has

Accepted Answer

A)  an atomic number of 39 and a mass number of 88. 
B)  an atomic number of 38 and a mass number of 86. 
C)  50 neutrons and 38 protons. 
D)  50 protons and 38 neutrons. 
A)  an atomic number of 39 and a mass number of 88. 
B)  an atomic number of 38 and a mass number of 86. 
C)  50 neutrons and 38 protons. 
D)  50 protons and 38 neutrons.

Question 10

How many S atoms are contained in 4.004 kg of S?

Accepted Answer

A)  7.53 × 1025 S atoms 
B)  4.36 × 1024 S atoms 
C)  1.74 × 1022 S atoms 
D)  9.35 × 1026 S atoms 
E)  6.93 × 1024 S atoms 
A)  7.53 × 1025 S atoms 
B)  4.36 × 1024 S atoms 
C)  1.74 × 1022 S atoms 
D)  9.35 × 1026 S atoms 
E)  6.93 × 1024 S atoms

Question 11

How many electrons are in a neutral atom of phosphorus-31?

Accepted Answer

A)  14 
B)  15 
C)  16 
D)  17 
E)  31 
A)  14 
B)  15 
C)  16 
D)  17 
E)  31

Question 12

The atomic number for lithium is

Accepted Answer

A)  12.01 
B)  57 
C)  3 
D)  6.94 
A)  12.01 
B)  57 
C)  3 
D)  6.94

Question 13

How many moles of Cs are contained in 595 kg of Cs?

Accepted Answer

A)  2.23 × 102 moles Cs 
B)  4.48 × 103 moles Cs 
C)  7.91 × 104 moles Cs 
D)  1.26 × 103 moles Cs 
E)  5.39 × 102 moles Cs 
A)  2.23 × 102 moles Cs 
B)  4.48 × 103 moles Cs 
C)  7.91 × 104 moles Cs 
D)  1.26 × 103 moles Cs 
E)  5.39 × 102 moles Cs

Question 14

Describe an atom and what it is made of according to modern atomic theory.

Accepted Answer

An atom is made of a nucleus surrounded

Question 15

Define an atom.

Accepted Answer

An atom is the submicroscopic

Question 16

Identify a solid.

Accepted Answer

A)  copper 
B)  oxygen 
C)  water 
D)  nitrogen 
E)  air 
A)  copper 
B)  oxygen 
C)  water 
D)  nitrogen 
E)  air

Question 17

How many molecules are in 2.50 moles of SiO2?

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

Why do the isotopes of the same element have the same atomic size?

Accepted Answer

Isotopes only differ in the nu

Question 19

Which of the following represent isotopes?
A:   X B:   X C:   X D:   X

Accepted Answer

A)  A and B 
B)  A and C 
C)  A and D 
D)  C and D 
A)  A and B 
B)  A and C 
C)  A and D 
D)  C and D

Question 20

Isotopes differ in the number of

Accepted Answer

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

Exam 2: Atoms

Why doesn't the mass spectrum of silver have a peak at 107.9 amu?

All samples of a given compound,regardless of their source or how they were prepared,have the same proportions of their constituent elements.Which law does this refer to?

Give the composition of water.

Which of the following statements about the phases of matter is TRUE?

A wooden baseball bat is an example of

Iodine is an example of

The number 6.022 × 1023 is called ________.

Identify the description of an atom.

An atom that has an atomic number of 38 and a mass number of 88 is an isotope of an atom that has

How many S atoms are contained in 4.004 kg of S?

How many electrons are in a neutral atom of phosphorus-31?

The atomic number for lithium is

How many moles of Cs are contained in 595 kg of Cs?

Describe an atom and what it is made of according to modern atomic theory.

Define an atom.

Identify a solid.

How many molecules are in 2.50 moles of SiO2?

Why do the isotopes of the same element have the same atomic size?

Which of the following represent isotopes? A: X B: X C: X D: X

Isotopes differ in the number of

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

The number 6.022 × 10²³ is called ________.

How many molecules are in 2.50 moles of SiO₂?