Question 1

Which of the following is correct for the fourth period element in Group 3A/13?

Accepted Answer

The answer of Which of the following is correct for...

Question 2

Which of the following is the correct classification for both sodium and chlorine?

Accepted Answer

A) Na is a main group element and a metal and Cl is a main group element and a nonmetal. 
B) Na is a main group element and a nonmetal and Cl is a main group element and a nonmetal. 
C) Na is a main group element and a nonmetal and Cl is a main group element and a metal. 
D) Na is a main group element and a metal and Cl is a main group element and a metal. 
E) Na is a main group element and a metal and Cl is a transition element and a nonmetal. 
A) Na is a main group element and a metal and Cl is a main group element and a nonmetal. 
B) Na is a main group element and a nonmetal and Cl is a main group element and a nonmetal. 
C) Na is a main group element and a nonmetal and Cl is a main group element and a metal. 
D) Na is a main group element and a metal and Cl is a main group element and a metal. 
E) Na is a main group element and a metal and Cl is a transition element and a nonmetal.

Question 3

Which of the following is the correct classification for both calcium and iron?

Accepted Answer

A) Ca is a transition element and a metal and Fe is a transition element and a metal. 
B) Ca is a transition element and a metal and Fe is a transition element and a nonmetal. 
C) Ca is a main group element and a metal and Fe is a transition element and a nonmetal. 
D) Ca is a main group element and a metal and Fe is a transition element and a metal. 
E) Ca is a main group element and a nonmetal and Fe is a main group element and a metal. 
A) Ca is a transition element and a metal and Fe is a transition element and a metal. 
B) Ca is a transition element and a metal and Fe is a transition element and a nonmetal. 
C) Ca is a main group element and a metal and Fe is a transition element and a nonmetal. 
D) Ca is a main group element and a metal and Fe is a transition element and a metal. 
E) Ca is a main group element and a nonmetal and Fe is a main group element and a metal.

Question 4

The natural distribution of the isotopes of a hypothetical element is 60.795% at a mass of 281.99481 u,22.122% at a mass of 283.99570 u,and the remainder has a mass of 286.99423 u.Calculate the atomic mass of the element.

Accepted Answer

A) 281.99 u 
B) 283.29 u 
C) 284.00 u 
D) 284.33 u 
E) 286.99 u 
A) 281.99 u 
B) 283.29 u 
C) 284.00 u 
D) 284.33 u 
E) 286.99 u

Question 5

​Which of the following is not a conclusion that follows from the results of the Rutherford scattering experiment?

Accepted Answer

A) ​Every atom contains an extremely small, extremely dense nucleus 
B) ​All of the positive charge and nearly all of the mass of an atom are concentrated in the nucleus 
C) ​The nucleus is surrounded by a much larger volume of empty space that makes up the rest of the atom 
D) ​When two elements combine to form more than one compound, the different weights of one element that combine with the same weight of the other element are in a simple ratio of whole numbers 
E) ​The space outside the nucleus is very thinly populated by electrons 
A) ​Every atom contains an extremely small, extremely dense nucleus 
B) ​All of the positive charge and nearly all of the mass of an atom are concentrated in the nucleus 
C) ​The nucleus is surrounded by a much larger volume of empty space that makes up the rest of the atom 
D) ​When two elements combine to form more than one compound, the different weights of one element that combine with the same weight of the other element are in a simple ratio of whole numbers 
E) ​The space outside the nucleus is very thinly populated by electrons

Question 6

Which of the following is correct for the element with atomic number 20?

Accepted Answer

The answer of Which of the following is correct for...

Question 7

Which of the following is correct for the element with Z = 9?

Accepted Answer

The answer of Which of the following is correct for...

Question 8

Which of the following statements is false?

Accepted Answer

A) The atomic mass unit is exactly 1/12 of the mass of a carbon-12 atom 
B) Both protons and neutrons have atomic masses very close to 1 u 
C) A carbon-12 atom with six electrons has a mass of 12.6 u 
D) The atomic mass of an element is the average mass of the atoms of an element compared to an atom of carbon-12 at exactly 12 u 
E) To find the atomic mass of an element, you must know the atomic mass of each isotope and the fraction of each isotope in a sample 
A) The atomic mass unit is exactly 1/12 of the mass of a carbon-12 atom 
B) Both protons and neutrons have atomic masses very close to 1 u 
C) A carbon-12 atom with six electrons has a mass of 12.6 u 
D) The atomic mass of an element is the average mass of the atoms of an element compared to an atom of carbon-12 at exactly 12 u 
E) To find the atomic mass of an element, you must know the atomic mass of each isotope and the fraction of each isotope in a sample

Question 9

Copper has two naturally occurring isotopes with atomic masses of 62.9296 u (   )and 64.9278 u (   ).The atomic mass of copper is 63.546 u.What is the percent distribution of the isotopes?

Accepted Answer

A) 69.15%   , 30.85%   
B) 30.85%   , 69.15%   
C) 1.08%   , 98.92%   
D) 98.92%   , 1.08%   
E) 99.03%   , 0.97%   
A) 69.15%   , 30.85%   
B) 30.85%   , 69.15%   
C) 1.08%   , 98.92%   
D) 98.92%   , 1.08%   
E) 99.03%   , 0.97%

Question 10

One of the main features of Dalton's atomic theory no longer considered valid is: All atoms of each element are identical in every respect.Which of the following is the best explanation of why this feature is no longer considered valid?

Accepted Answer

A) The existence of isotopes 
B) Mass is conserved in a chemical change 
C) Nearly all of the mass of an atom is concentrated in the nucleus 
D) The total charge of the electrons of an atom exactly balances the positive charge of the nucleus 
E) The planetary model of the atom has been shown to be incorrect 
A) The existence of isotopes 
B) Mass is conserved in a chemical change 
C) Nearly all of the mass of an atom is concentrated in the nucleus 
D) The total charge of the electrons of an atom exactly balances the positive charge of the nucleus 
E) The planetary model of the atom has been shown to be incorrect

Question 11

Which of the following statements is false?

Accepted Answer

A) Atoms of the same element that have different masses are called isotopes 
B) The masses of isotopes vary because they have different numbers of electrons 
C) The mass number of an isotope is the total number of protons and neutrons in the nucleus 
D) You can find the mass number of an atom given the number of protons and neutrons, but without being given the number of electrons 
E) Every atom of a particular element has the same number of protons 
A) Atoms of the same element that have different masses are called isotopes 
B) The masses of isotopes vary because they have different numbers of electrons 
C) The mass number of an isotope is the total number of protons and neutrons in the nucleus 
D) You can find the mass number of an atom given the number of protons and neutrons, but without being given the number of electrons 
E) Every atom of a particular element has the same number of protons

Question 12

Consider the following figure.   Which of the following correctly identifies the quantities labeled 1,2,and 3?

Accepted Answer

A) 1 - atomic mass, 2 - element name, 3 - mass number 
B) 1 - atomic number, 2 - element symbol, 3 -atomic mass 
C) 1 - mass number , 2 - element symbol, 3 - atomic mass 
D) 1 - mass number, 2 - element name, 3 - atomic number 
E) 1 - atomic number, 2 - element symbol, 3 - mass number 
A) 1 - atomic mass, 2 - element name, 3 - mass number 
B) 1 - atomic number, 2 - element symbol, 3 -atomic mass 
C) 1 - mass number , 2 - element symbol, 3 - atomic mass 
D) 1 - mass number, 2 - element name, 3 - atomic number 
E) 1 - atomic number, 2 - element symbol, 3 - mass number

Question 13

Which of the following elements are correctly matched with their period and group?

Accepted Answer

A) v only 
B) i, ii, iii, and iv 
C) ii, iii, and iv 
D) i, ii, and iii 
E) ii and iii 
A) v only 
B) i, ii, iii, and iv 
C) ii, iii, and iv 
D) i, ii, and iii 
E) ii and iii

Question 14

Which of the following is a correct statement about the Rutherford scattering experiment?

Accepted Answer

A) The experiment provided an explanation of the discrete lines in atomic spectra 
B) The experiment yielded evidence that electrons are charged particles but neutrons are not electrically charged 
C) The experiment showed that the electrons contain nearly all of the mass of the atom 
D) The experiment provided evidence that matter does not consist of atoms 
E) The experiment indicated that at the center of the atom is a tiny and extremely dense nucleus 
A) The experiment provided an explanation of the discrete lines in atomic spectra 
B) The experiment yielded evidence that electrons are charged particles but neutrons are not electrically charged 
C) The experiment showed that the electrons contain nearly all of the mass of the atom 
D) The experiment provided evidence that matter does not consist of atoms 
E) The experiment indicated that at the center of the atom is a tiny and extremely dense nucleus

Question 15

Dalton's atomic theory led to a prediction that must be true if the theory is correct: when two elements combine to form a compound,the masses in which they combine is constant..What is the name of this Law that followed from Dalton's atomic theory?

Accepted Answer

A) The Law of Weight Ratios 
B) The Law of Multiple Proportions 
C) The Law of Definite Composition 
D) The Law of Conservation of Weight 
E) The Law of Conservation of Mass 
A) The Law of Weight Ratios 
B) The Law of Multiple Proportions 
C) The Law of Definite Composition 
D) The Law of Conservation of Weight 
E) The Law of Conservation of Mass

Question 16

Which of the following features of Dalton's atomic theory is/are no longer considered valid?
i.Each element is made up of tiny,individual particles called atoms
ii.Atoms are indivisible; they cannot be created or destroyed
iii.All atoms of each element are identical in every respect
iv.Atoms of one element are different from atoms of any other element
v.Atoms of one element may combine with atoms of another element to form chemical compounds

Accepted Answer

A) ii only 
B) iii only 
C) iv only 
D) ii and iii 
E) ii, iii, and iv 
A) ii only 
B) iii only 
C) iv only 
D) ii and iii 
E) ii, iii, and iv

Question 17

Consider the following figure which represents an element block on the periodic table.   If this is the block for the nonmetal found in period 3 group 5A,the question marks 1,2,and 3 should be filled in,respectively,with which of the following?

Accepted Answer

A) 33, As, 74.92 
B) 23, V, 50.94 
C) 15, P, 30.97 
D) 39, Y, 88.91 
A) 33, As, 74.92 
B) 23, V, 50.94 
C) 15, P, 30.97 
D) 39, Y, 88.91

Question 18

Which of the following statements is true?

Accepted Answer

A) Given the atomic number of an element, the atomic mass of the element can be calculated 
B) An isotope is identified by its mass number 
C) The number of neutrons in an atom determines the chemical reactivity of that isotope 
D) The total contribution to the mass of an atom from protons and electrons varies among the atoms of an element 
E) Mass differences among atoms of an element cannot be accounted for with our current understanding of the atom 
A) Given the atomic number of an element, the atomic mass of the element can be calculated 
B) An isotope is identified by its mass number 
C) The number of neutrons in an atom determines the chemical reactivity of that isotope 
D) The total contribution to the mass of an atom from protons and electrons varies among the atoms of an element 
E) Mass differences among atoms of an element cannot be accounted for with our current understanding of the atom

Question 19

The nuclear symbol of an isotope of potassium is   .Indicate the number of protons,number of neutrons,atomic number,and mass number of the isotope.

Accepted Answer

The answer of The nuclear symbol of an isotope of...

Question 20

Which of the three major subatomic particles has/have a mass of approximately 1 u?
i.e-
ii.p+
iii.n0

Accepted Answer

A) i only 
B) ii only 
C) iii only 
D) i and ii 
E) ii and iii 
A) i only 
B) ii only 
C) iii only 
D) i and ii 
E) ii and iii

Which of the following is correct for the fourth period element in Group 3A/13?

Which of the following is the correct classification for both sodium and chlorine?

Which of the following is the correct classification for both calcium and iron?

The natural distribution of the isotopes of a hypothetical element is 60.795% at a mass of 281.99481 u,22.122% at a mass of 283.99570 u,and the remainder has a mass of 286.99423 u.Calculate the atomic mass of the element.

Which of the following is not a conclusion that follows from the results of the Rutherford scattering experiment?

Which of the following is correct for the element with atomic number 20?

Which of the following is correct for the element with Z = 9?

Which of the following statements is false?

Copper has two naturally occurring isotopes with atomic masses of 62.9296 u ( )and 64.9278 u ( ).The atomic mass of copper is 63.546 u.What is the percent distribution of the isotopes?

One of the main features of Dalton's atomic theory no longer considered valid is: All atoms of each element are identical in every respect.Which of the following is the best explanation of why this feature is no longer considered valid?

Which of the following statements is false?

Consider the following figure. Which of the following correctly identifies the quantities labeled 1,2,and 3?

Which of the following elements are correctly matched with their period and group?

Which of the following is a correct statement about the Rutherford scattering experiment?

Dalton's atomic theory led to a prediction that must be true if the theory is correct: when two elements combine to form a compound,the masses in which they combine is constant..What is the name of this Law that followed from Dalton's atomic theory?

Consider the following figure which represents an element block on the periodic table. If this is the block for the nonmetal found in period 3 group 5A,the question marks 1,2,and 3 should be filled in,respectively,with which of the following?

Which of the following statements is true?

The nuclear symbol of an isotope of potassium is .Indicate the number of protons,number of neutrons,atomic number,and mass number of the isotope.

Which of the three major subatomic particles has/have a mass of approximately 1 u? i.e^- ii.p⁺ iii.n⁰

Matter and Energy

Measurement and Chemical Calculations

Introduction to Gases

Chemical Nomenclature

Chemical Formula Relationships

Chemical Reactions

Chemical Change

Quantity Relationships in Chemical Reactions

Atomic Theory: The Quantum Model of the Atom

Chemical Bonding

Structure and Shape

The Ideal Gas Law and Its Applications

Gases, Liquids, and Solids

Solutions

Acidbase Proton Transferreactions

Chemical Equilibrium

Oxidationreduction Electron Transferreactions

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Exam 5: Atomic Theory: The Nuclear Model of the Atom

Which of the following is correct for the fourth period element in Group 3A/13?

Which of the following is the correct classification for both sodium and chlorine?

Which of the following is the correct classification for both calcium and iron?

The natural distribution of the isotopes of a hypothetical element is 60.795% at a mass of 281.99481 u,22.122% at a mass of 283.99570 u,and the remainder has a mass of 286.99423 u.Calculate the atomic mass of the element.

​Which of the following is not a conclusion that follows from the results of the Rutherford scattering experiment?

Which of the following is correct for the element with atomic number 20?

Which of the following is correct for the element with Z = 9?

Which of the following statements is false?

Copper has two naturally occurring isotopes with atomic masses of 62.9296 u ( )and 64.9278 u ( ).The atomic mass of copper is 63.546 u.What is the percent distribution of the isotopes?

One of the main features of Dalton's atomic theory no longer considered valid is: All atoms of each element are identical in every respect.Which of the following is the best explanation of why this feature is no longer considered valid?

Which of the following statements is false?

Consider the following figure. Which of the following correctly identifies the quantities labeled 1,2,and 3?

Which of the following elements are correctly matched with their period and group?

Which of the following is a correct statement about the Rutherford scattering experiment?

Dalton's atomic theory led to a prediction that must be true if the theory is correct: when two elements combine to form a compound,the masses in which they combine is constant..What is the name of this Law that followed from Dalton's atomic theory?

Consider the following figure which represents an element block on the periodic table. If this is the block for the nonmetal found in period 3 group 5A,the question marks 1,2,and 3 should be filled in,respectively,with which of the following?

Which of the following statements is true?

The nuclear symbol of an isotope of potassium is .Indicate the number of protons,number of neutrons,atomic number,and mass number of the isotope.

Which of the three major subatomic particles has/have a mass of approximately 1 u? i.e- ii.p+ iii.n0

Matter and Energy

Measurement and Chemical Calculations

Introduction to Gases

Chemical Nomenclature

Chemical Formula Relationships

Chemical Reactions

Chemical Change

Quantity Relationships in Chemical Reactions

Atomic Theory: The Quantum Model of the Atom

Chemical Bonding

Structure and Shape

The Ideal Gas Law and Its Applications

Gases, Liquids, and Solids

Solutions

Acidbase Proton Transferreactions

Chemical Equilibrium

Oxidationreduction Electron Transferreactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

Which of the following is not a conclusion that follows from the results of the Rutherford scattering experiment?

Which of the three major subatomic particles has/have a mass of approximately 1 u? i.e^- ii.p⁺ iii.n⁰