Question 1

Which of the following elements are in the same group as silicon (Si)?

Accepted Answer

A) C 
B) P 
C) As 
D) B 
E) none of the above 
A) C 
B) P 
C) As 
D) B 
E) none of the above

Question 2

Which of the following elements is a halogen?

Accepted Answer

A) argon (Ar) 
B) lead (Pb) 
C) chlorine (Cl) 
D) indium (In) 
E) lithium (Li) 
A) argon (Ar) 
B) lead (Pb) 
C) chlorine (Cl) 
D) indium (In) 
E) lithium (Li)

Question 3

Would you use a physical model or a conceptual model to describe the following: a gold coin,dollar bill,car engine,air pollution,virus,spread of sexually transmitted disease?

Accepted Answer

A) conceptual model-gold coin,car engine,virus; physical model-air pollution,spread of sexually transmitted disease,dollar bill 
B) physical model-gold coin,car engine,virus; conceptual model-air pollution,spread of sexually transmitted disease; dollar bill,which could represent wealth,may well be described by either model. 
C) You could adequately describe all of the topics by either model.The choice depends only on the characteristics requiring description. 
D) physical model-gold coin,dollar bill,car engine; conceptual model-virus,air pollution,spread of sexually transmitted disease 
A) conceptual model-gold coin,car engine,virus; physical model-air pollution,spread of sexually transmitted disease,dollar bill 
B) physical model-gold coin,car engine,virus; conceptual model-air pollution,spread of sexually transmitted disease; dollar bill,which could represent wealth,may well be described by either model. 
C) You could adequately describe all of the topics by either model.The choice depends only on the characteristics requiring description. 
D) physical model-gold coin,dollar bill,car engine; conceptual model-virus,air pollution,spread of sexually transmitted disease

Question 4

Consider the various frequencies of the three photons emitted from the following three individual electron transitions in the figure below: n=3 to n=2; n=2 to n=1; n=3 to n=1.These transitions would produce three spectral lines in a spectroscope.If the energy spacing between the levels were equal,would this affect the number of spectral lines?

Accepted Answer

A) Yes,two otherwise separate lines would converge into a single more intense line. 
B) No,but the spacing between the spectral lines would change. 
C) Yes,two otherwise separate lines would converge into a single less intense line. 
D) No,but some would then require a prism in order to be seen. 
A) Yes,two otherwise separate lines would converge into a single more intense line. 
B) No,but the spacing between the spectral lines would change. 
C) Yes,two otherwise separate lines would converge into a single less intense line. 
D) No,but some would then require a prism in order to be seen.

Question 5

How is it possible to deduce the identity of an element from its electron configuration?

Accepted Answer

A) The number of occupied shells corresponds to the atom's atomic number. 
B) If the atom is electrically neutral,the number of electrons corresponds to the atom's atomic number. 
C) Using the periodic table,the outermost occupied shell indicates the group while the number of occupied shells indicates the period. 
D) An electron configuration is unique to each element,much like its atomic spectrum. 
A) The number of occupied shells corresponds to the atom's atomic number. 
B) If the atom is electrically neutral,the number of electrons corresponds to the atom's atomic number. 
C) Using the periodic table,the outermost occupied shell indicates the group while the number of occupied shells indicates the period. 
D) An electron configuration is unique to each element,much like its atomic spectrum.

Question 6

Which of the following elements is a gas at room temperature?

Accepted Answer

A) argon (Ar) 
B) lead (Pb) 
C) cesium (Cs) 
D) indium (In) 
E) lithium (Li) 
A) argon (Ar) 
B) lead (Pb) 
C) cesium (Cs) 
D) indium (In) 
E) lithium (Li)

Question 7

Which of the following could NOT be represented by a conceptual model?

Accepted Answer

A) the energy of a nucleus 
B) the floor plan of a house 
C) the weather 
D) the behavior of schoolchildren 
E) both A and B 
A) the energy of a nucleus 
B) the floor plan of a house 
C) the weather 
D) the behavior of schoolchildren 
E) both A and B

Question 8

If an element has 9 protons and 10 neutrons and 9 electrons,which expression correctly identifies the element?

Accepted Answer

A)  $\begin{array} { c } 
19 \
9
\end{array}$ F 
B)  $\begin{array} { c } 
9 \
19
\end{array}$ F 
C)  $\begin{array} { c } 
19 \
9
\end{array}$ K 
D)  $\begin{array} { c } 
9 \
19
\end{array}$ K 
E)  $\begin{array} { c } 
19 \
19
\end{array}$ 
A)  $\begin{array} { c } 
19 \
9
\end{array}$ F 
B)  $\begin{array} { c } 
9 \
19
\end{array}$ F 
C)  $\begin{array} { c } 
19 \
9
\end{array}$ K 
D)  $\begin{array} { c } 
9 \
19
\end{array}$ K 
E)  $\begin{array} { c } 
19 \
19
\end{array}$

Question 9

If a neutral element has the following chemical notation,how many electrons does it have? fluorine-19

Accepted Answer

A) 9 
B) 10 
C) 11 
D) 19 
E) none of the above 
A) 9 
B) 10 
C) 11 
D) 19 
E) none of the above

Question 10

If an atom has 43 electrons,56 neutrons,and 43 protons,what is its approximate atomic mass? What is the name of this element?

Accepted Answer

A) atomic mass,137 amu; Barium 
B) atomic mass,99 amu; Technetium 
C) atomic mass,99 amu; Radon 
D) atomic mass 142 amu; Einsteinium 
A) atomic mass,137 amu; Barium 
B) atomic mass,99 amu; Technetium 
C) atomic mass,99 amu; Radon 
D) atomic mass 142 amu; Einsteinium

Question 11

Using the following generic atom description,choose the correct method for determining the number of neutrons. $\begin{array} { l } 
F \
G
\end{array}$ X

Accepted Answer

A) subtract G from F 
B) subtract F from G 
C) add F and G 
D) divide F by G 
E) look it up on the periodic table 
A) subtract G from F 
B) subtract F from G 
C) add F and G 
D) divide F by G 
E) look it up on the periodic table

Question 12

Evidence for the existence of neutrons did not come until many years after the discoveries of the electron and the proton.Give a possible explanation.

Accepted Answer

A) The neutron is nearly massless. 
B) The neutron is only slightly more massive than the proton. 
C) The discovery required the use of ultrafast computers. 
D) The neutron lacks an electrical charge. 
A) The neutron is nearly massless. 
B) The neutron is only slightly more massive than the proton. 
C) The discovery required the use of ultrafast computers. 
D) The neutron lacks an electrical charge.

Question 13

What was Niels Bohr's explanation for the observation of atomic spectra?

Accepted Answer

A) Electrons could only move in discrete energy steps within an atom. 
B) Electrons could not move in an atom. 
C) Any photon could excite an electron. 
D) Only certain photons with the correct energy could excite the quanta in the nucleus. 
E) Nucleons could be excited by different electron energies. 
A) Electrons could only move in discrete energy steps within an atom. 
B) Electrons could not move in an atom. 
C) Any photon could excite an electron. 
D) Only certain photons with the correct energy could excite the quanta in the nucleus. 
E) Nucleons could be excited by different electron energies.

Question 14

The isotope lithium-7 has a mass of 7.0160 atomic mass units,and the isotope lithium-6 has a mass of 6.0151 atomic mass units.Given the information that 92.58 percent of all lithium atoms found in nature are lithium-7 and 7.42 percent are lithium-6,calculate the atomic mass of lithium,Li (atomic number 3).

Accepted Answer

A) 7.0160 amu 
B) 6.942 amu 
C) 6.495 amu 
D) 13.031 amu 
A) 7.0160 amu 
B) 6.942 amu 
C) 6.495 amu 
D) 13.031 amu

Question 15

The ________ represents the complete range of frequencies of light energy from radio waves to cosmic rays.

Accepted Answer

A) electromagnetic spectrum 
B) electron configuration 
C) probability cloud 
D) frequency dependence 
E) spectroscopic model 
A) electromagnetic spectrum 
B) electron configuration 
C) probability cloud 
D) frequency dependence 
E) spectroscopic model

Question 16

How can a hydrogen atom,which has only one electron,have so many spectral lines?

Accepted Answer

A) The electron is able to move at various speeds. 
B) The protons in the nucleus are also giving off various light frequencies. 
C) One electron can be boosted to many different energy levels. 
D) The atomic radius of the hydrogen atom is relatively large. 
A) The electron is able to move at various speeds. 
B) The protons in the nucleus are also giving off various light frequencies. 
C) One electron can be boosted to many different energy levels. 
D) The atomic radius of the hydrogen atom is relatively large.

Question 17

Which atom is smallest?

Accepted Answer

A) Be 
B) Mg 
C) Ca 
D) Sr 
E) All are the same size. 
A) Be 
B) Mg 
C) Ca 
D) Sr 
E) All are the same size.

Question 18

Should the periodic table be memorized? Why or why not?

Accepted Answer

A) Yes.Like the alphabet,we need to memorize the periodic table in order to easily write the language of chemistry. 
B) Yes.Without memorizing the periodic table,one would not have any real understanding of how and why chemical compounds are put together. 
C) No.The periodic table changes every year.Memorizing it would be a waste of time. 
D) No.The periodic table is a reference to be used,not memorized. 
A) Yes.Like the alphabet,we need to memorize the periodic table in order to easily write the language of chemistry. 
B) Yes.Without memorizing the periodic table,one would not have any real understanding of how and why chemical compounds are put together. 
C) No.The periodic table changes every year.Memorizing it would be a waste of time. 
D) No.The periodic table is a reference to be used,not memorized.

Question 19

An element is best described as a material

Accepted Answer

A) consisting of only one type of atom. 
B) that is pure. 
C) that has consistent physical properties. 
D) with more than one type of atom. 
E) that has consistent chemical properties. 
A) consisting of only one type of atom. 
B) that is pure. 
C) that has consistent physical properties. 
D) with more than one type of atom. 
E) that has consistent chemical properties.

Question 20

An element found in another galaxy exists as two isotopes.If 80.0 percent of the atoms have an atomic mass of 80.00 atomic mass units and the other 20.0 percent have an atomic mass of 82.00 atomic mass units,what is the atomic mass of the element?

Accepted Answer

A) 81.0 atomic mass units 
B) 64.0 atomic mass units 
C) 80.4 atomic mass units 
D) 16.4 atomic mass units 
E) 81.6 atomic mass units 
A) 81.0 atomic mass units 
B) 64.0 atomic mass units 
C) 80.4 atomic mass units 
D) 16.4 atomic mass units 
E) 81.6 atomic mass units

Exam 12: Atoms and the Periodic Table

Which of the following elements are in the same group as silicon (Si)?

Which of the following elements is a halogen?

Would you use a physical model or a conceptual model to describe the following: a gold coin,dollar bill,car engine,air pollution,virus,spread of sexually transmitted disease?

How is it possible to deduce the identity of an element from its electron configuration?

Which of the following elements is a gas at room temperature?

Which of the following could NOT be represented by a conceptual model?

If an element has 9 protons and 10 neutrons and 9 electrons,which expression correctly identifies the element?

If a neutral element has the following chemical notation,how many electrons does it have? fluorine-19

If an atom has 43 electrons,56 neutrons,and 43 protons,what is its approximate atomic mass? What is the name of this element?

Using the following generic atom description,choose the correct method for determining the number of neutrons. F G X

Evidence for the existence of neutrons did not come until many years after the discoveries of the electron and the proton.Give a possible explanation.

What was Niels Bohr's explanation for the observation of atomic spectra?

The ________ represents the complete range of frequencies of light energy from radio waves to cosmic rays.

How can a hydrogen atom,which has only one electron,have so many spectral lines?

Which atom is smallest?

Should the periodic table be memorized? Why or why not?

An element is best described as a material

An element found in another galaxy exists as two isotopes.If 80.0 percent of the atoms have an atomic mass of 80.00 atomic mass units and the other 20.0 percent have an atomic mass of 82.00 atomic mass units,what is the atomic mass of the element?

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Time - Reading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: The Nature of Science

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