Question 1

Which of the following have roughly the same mass?

Accepted Answer

A) a proton and an electron 
B) a neutron and an electron 
C) a neutron and a proton 
D) an electron and an alpha particle 
E) none of these options 
A) a proton and an electron 
B) a neutron and an electron 
C) a neutron and a proton 
D) an electron and an alpha particle 
E) none of these options

Question 2

When an electrical spark is passed through hydrogen gas molecules, positive ions can be generated through the interaction.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following examples is consistent with the postulates from Dalton's atomic theory? Hint: Be sure to keep the definitions of atoms and molecules straight!

Accepted Answer

A) The atoms in a sample of chlorine are similar to the atoms in a sample of elemental sulfur. 
B) Matter consists of extremely tiny particles that are always either positively or negatively charged. 
C) When water is formed from oxygen and hydrogen molecules, the atoms in water are grouped differently compared to the atoms in molecules of hydrogen and oxygen. 
D) A sample of water contains hydrogen and oxygen atoms combined in two different ratios by mass. 
E) There are eight different types of sulfur atoms in any naturally occurring sample of elemental sulfur. 
A) The atoms in a sample of chlorine are similar to the atoms in a sample of elemental sulfur. 
B) Matter consists of extremely tiny particles that are always either positively or negatively charged. 
C) When water is formed from oxygen and hydrogen molecules, the atoms in water are grouped differently compared to the atoms in molecules of hydrogen and oxygen. 
D) A sample of water contains hydrogen and oxygen atoms combined in two different ratios by mass. 
E) There are eight different types of sulfur atoms in any naturally occurring sample of elemental sulfur.

Question 4

If 2.00 grams of molecular hydrogen react with 16.00 grams of oxygen to form water, how many grams of water must be formed if all of the hydrogen and oxygen react? Hint: Consider the ratio of the masses to determine the mass of compound.

Accepted Answer

The answer of If 2.00 grams of molecular hydrogen react...

Question 5

A compound of phosphorus and chlorine contains 3.00 grams of phosphorus and 10.3 grams of chlorine. There are ________ grams of phosphorus in a sample of the compound containing 17.2 grams of chlorine. Hint: Consider the ratio of the masses to determine the mass of phosphorous.

Accepted Answer

The answer of A compound of phosphorus and chlorine contains...

Question 6

Uranium exists in nature in the form of several isotopes and the different isotopes have different

Accepted Answer

A) atomic numbers. 
B) charges. 
C) numbers of electrons. 
D) numbers of neutrons. 
E) numbers of protons. 
A) atomic numbers. 
B) charges. 
C) numbers of electrons. 
D) numbers of neutrons. 
E) numbers of protons.

Question 7

Based on the law of Conservation of Mass, 1.8 g of elemental carbon (C)reacts with 4.8 g of molecular oxygen (O2)to produce carbon dioxide gas (CO2)as the only product. What mass of carbon dioxide is formed?

Accepted Answer

A) 18 g 
B) 1.9 g 
C) 6.6 g 
D) 12 g 
E) 1.2 g 
A) 18 g 
B) 1.9 g 
C) 6.6 g 
D) 12 g 
E) 1.2 g

Question 8

A compound is made of nitrogen and hydrogen in a ratio of 5.65 grams nitrogen to 1.22 grams of hydrogen. There are ________ grams of nitrogen in a sample of this compound containing 4.00 grams of hydrogen. Hint: Consider the ratio of the masses to determine the mass of nitrogen.

Accepted Answer

The answer of A compound is made of nitrogen and...

Question 9

Atoms must be broken apart into their subatomic particles and then rearranged in order for chemical reactions to occur. Hint: What happens in a chemical reaction between reactants and products?

Accepted Answer

A) True 
 B)False

Question 10

The species   V has the same number of neutrons as

Accepted Answer

A)    V 
B)    Sc 
C)    Mn 
D)    Cr 
E)    Co 
A)    V 
B)    Sc 
C)    Mn 
D)    Cr 
E)    Co

Question 11

Compare   Mg and   Al. In what respect do these species differ? I. number of neutrons and number of electrons
II. number of protons, and number of neutrons
III. mass number and number of protons

Accepted Answer

A) I only 
B) II only 
C) III only 
D) I and III 
E) I, II, and III 
A) I only 
B) II only 
C) III only 
D) I and III 
E) I, II, and III

Question 12

To form hydrogen sulfide, H2S, 4.03 g of molecular hydrogen (H2)are reacted with 62.13 g of sulfur (S). If all of the hydrogen and sulfur completely react to form hydrogen sulfide, how many grams of hydrogen sulfide should be formed?

Accepted Answer

A) 66.16 g 
B) 58.10 g 
C) 4.03 g 
D) 70.19 g 
E) 33.03 g 
A) 66.16 g 
B) 58.10 g 
C) 4.03 g 
D) 70.19 g 
E) 33.03 g

Question 13

Average atomic masses are used in the periodic table. These values give the true representation of mixtures of isotopes for different elements that are consistent around the world and universe.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following postulates from Dalton's atomic theory is incorrectly stated?

Accepted Answer

A) The atoms in a given sample of an element are identical. 
B) Matter consists of tiny particles called atoms. 
C) In chemical reactions, atoms merely rearrange and do not disintegrate. 
D) In a given chemical compound, the atoms can be present in various numerical ratios. 
E) The atoms of different elements differ in mass and other properties. 
A) The atoms in a given sample of an element are identical. 
B) Matter consists of tiny particles called atoms. 
C) In chemical reactions, atoms merely rearrange and do not disintegrate. 
D) In a given chemical compound, the atoms can be present in various numerical ratios. 
E) The atoms of different elements differ in mass and other properties.

Question 15

Which of the following particles will not be deflected by charged plates?

Accepted Answer

A) hydrogen atoms 
B) cathode rays 
C) alpha particles 
D) protons 
E) These are all deflected by charged plates. 
A) hydrogen atoms 
B) cathode rays 
C) alpha particles 
D) protons 
E) These are all deflected by charged plates.

Question 16

The atomic mass of naturally occurring gallium, which is a mixture of two isotopes, is listed as 69.723 u. This means that ,Hint: Individual atoms have a mass number that is the sum of the protons and neutrons.

Accepted Answer

A) all gallium atoms found in nature have a mass that is 69.723/12.000 times as great as that of a 12C atom. 
B) all gallium atoms found in nature have a mass that is 69.723/1.0079 times as great as that of a 1H atom. 
C) some gallium atoms found in nature have a mass that is 69.723/12.000 times as great as that of a 12C atom. 
D) some gallium atoms found in nature have a mass that is 69.723/1.0079 times as great as that of a 1H atom. 
E) no gallium atoms found in nature has a mass that is 69.723/12.000 times as great as that of a 12C atom. 
A) all gallium atoms found in nature have a mass that is 69.723/12.000 times as great as that of a 12C atom. 
B) all gallium atoms found in nature have a mass that is 69.723/1.0079 times as great as that of a 1H atom. 
C) some gallium atoms found in nature have a mass that is 69.723/12.000 times as great as that of a 12C atom. 
D) some gallium atoms found in nature have a mass that is 69.723/1.0079 times as great as that of a 1H atom. 
E) no gallium atoms found in nature has a mass that is 69.723/12.000 times as great as that of a 12C atom.

Question 17

Molecules are made of tiny particles called ________.

Accepted Answer

The answer of Molecules are made of tiny particles called...

Question 18

The species shown below that has 24 electrons is

Accepted Answer

A)    Cr 
B)    Mn 
C)    Mg 
D)    Sc 
E)    V 
A)    Cr 
B)    Mn 
C)    Mg 
D)    Sc 
E)    V

Question 19

Consider the atoms of   Mg and   Al. Both of these species have the same

Accepted Answer

A) number of neutrons and electrons. 
B) number of ions. 
C) number of neutrons. 
D) number of neutrons and mass number. 
E) number of protons and electrons. 
A) number of neutrons and electrons. 
B) number of ions. 
C) number of neutrons. 
D) number of neutrons and mass number. 
E) number of protons and electrons.

Question 20

Which of the following statements is/are consistent with Dalton's atomic theory?
I. The atoms in a given sample of an element do not share any common properties.
II. Matter consists of particles called atoms.
III. In chemical reactions, atoms merely rearrange and do not disintegrate.

Accepted Answer

A) III only 
B) II only 
C) I only 
D) II and III 
E) I and III 
A) III only 
B) II only 
C) I only 
D) II and III 
E) I and III

Exam 1: A Very Brief History of Chemistry

Which of the following have roughly the same mass?

When an electrical spark is passed through hydrogen gas molecules, positive ions can be generated through the interaction.

Which of the following examples is consistent with the postulates from Dalton's atomic theory? Hint: Be sure to keep the definitions of atoms and molecules straight!

If 2.00 grams of molecular hydrogen react with 16.00 grams of oxygen to form water, how many grams of water must be formed if all of the hydrogen and oxygen react? Hint: Consider the ratio of the masses to determine the mass of compound.

A compound of phosphorus and chlorine contains 3.00 grams of phosphorus and 10.3 grams of chlorine. There are ________ grams of phosphorus in a sample of the compound containing 17.2 grams of chlorine. Hint: Consider the ratio of the masses to determine the mass of phosphorous.

Uranium exists in nature in the form of several isotopes and the different isotopes have different

Based on the law of Conservation of Mass, 1.8 g of elemental carbon (C)reacts with 4.8 g of molecular oxygen (O2)to produce carbon dioxide gas (CO2)as the only product. What mass of carbon dioxide is formed?

A compound is made of nitrogen and hydrogen in a ratio of 5.65 grams nitrogen to 1.22 grams of hydrogen. There are ________ grams of nitrogen in a sample of this compound containing 4.00 grams of hydrogen. Hint: Consider the ratio of the masses to determine the mass of nitrogen.

Atoms must be broken apart into their subatomic particles and then rearranged in order for chemical reactions to occur. Hint: What happens in a chemical reaction between reactants and products?

The species V has the same number of neutrons as

Compare Mg and Al. In what respect do these species differ? I. number of neutrons and number of electrons II. number of protons, and number of neutrons III. mass number and number of protons

To form hydrogen sulfide, H2S, 4.03 g of molecular hydrogen (H2)are reacted with 62.13 g of sulfur (S). If all of the hydrogen and sulfur completely react to form hydrogen sulfide, how many grams of hydrogen sulfide should be formed?

Average atomic masses are used in the periodic table. These values give the true representation of mixtures of isotopes for different elements that are consistent around the world and universe.

Which of the following postulates from Dalton's atomic theory is incorrectly stated?

Which of the following particles will not be deflected by charged plates?

The atomic mass of naturally occurring gallium, which is a mixture of two isotopes, is listed as 69.723 u. This means that ,Hint: Individual atoms have a mass number that is the sum of the protons and neutrons.

Molecules are made of tiny particles called ________.

The species shown below that has 24 electrons is

Consider the atoms of Mg and Al. Both of these species have the same

Which of the following statements is/are consistent with Dalton's atomic theory? I. The atoms in a given sample of an element do not share any common properties. II. Matter consists of particles called atoms. III. In chemical reactions, atoms merely rearrange and do not disintegrate.

Scientific Measurements

Elements, Compounds, and the Periodic Table

The Mole and Stoichiometry

Molecular View of Reactions in Aqueous Solutions

Oxidation-Reduction Reactions

Energy and Chemical Change

The Quantum Mechanical Atom

The Basics of Chemical Bonding

Theories of Bonding and Structure

Properties of Gases

Intermolecular Attractions and the Properties of Liquids and Solids

Mixtures at the Molecular Level: Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases, a Molecular Look

Acid-Base Equilibria in Aqueous Solutions

Solubility and Simultaneous Equilibria

Thermodynamics

Electrochemistry

Nuclear Reactions and Their Role in Chemistry

Metal Complexes

Organic Compounds, Polymers, and Biochemicals

Filters

Based on the law of Conservation of Mass, 1.8 g of elemental carbon (C)reacts with 4.8 g of molecular oxygen (O₂)to produce carbon dioxide gas (CO₂)as the only product. What mass of carbon dioxide is formed?

To form hydrogen sulfide, H₂S, 4.03 g of molecular hydrogen (H₂)are reacted with 62.13 g of sulfur (S). If all of the hydrogen and sulfur completely react to form hydrogen sulfide, how many grams of hydrogen sulfide should be formed?