Question 1

A group of molecular biologists is trying to synthesize a new artificial compound to mimic the effects of a known hormone that influences sexual behavior. They have turned to you for advice. Which of the following compounds is most likely to mimic the effects of the hormone?

Accepted Answer

A)  a compound with the same number of carbon atoms as the hormone
B)  a compound with the same molecular mass (measured in daltons) as the hormone
C)  a compound with the same three-dimensional shape as part of the hormone
D)  a compound with the same number of orbital electrons as the hormone
E)  a compound with the same number of hydrogen and nitrogen atoms as the hormoneF) B) and E)
G) A) and C)

Question 2

Which of the following is not considered to be a weak molecular interaction?

Accepted Answer

A)  a covalent bond
B)  a van der Waals interaction
C)  an ionic bond in the presence of water
D)  a hydrogen bond
E)  A and B onlyF) A) and B)
G) A) and C)

Question 3

Please refer to Figure 2.1 to answer the following questions.

-Which drawing is of an atom with the atomic number of 6?

Accepted Answer

The answer of Please refer to Figure 2.1 to answer...

Question 4

Which of the following molecules contains the strongest polar covalent bond?

Accepted Answer

A)  H₂
B)  O₂
C)  CO₂
D)  H₂O
E)  CH₄F) All of the above
G) B) and D) D

Question 5

333  H is a radioactive isotope of hydrogen. One difference between hydrogen-1 (  11\begin{array} { l } 1 \1\end{array}11​  H) and hydrogen-3 (  31\begin{array} { l } 3 \1\end{array}31​  H) is that hydrogen-3 has

Accepted Answer

A)  one more neutron and one more proton than hydrogen-1.
B)  one more proton and one more electron than hydrogen-1.
C)  one more electron and one more neutron than hydrogen-1.
D)  two more neutrons than hydrogen-1.
E)  two more protons than hydrogen-1. F) B) and E)
G) B) and C)

Question 6

What coefficients must be placed in the following blanks so that all atoms are accounted for in the products?
C₆H₁₂O₆ → ___ C₂H₆O + ___ CO₂

Accepted Answer

A)  1; 2
B)  2; 2
C)  1; 3
D)  1; 1
E)  3; 1F) All of the above
G) C) and D) B

Question 7

The reactivity of an atom arises from

Accepted Answer

A)  the average distance of the outermost electron shell from the nucleus.
B)  the existence of unpaired electrons in the valence shell.
C)  the sum of the potential energies of all the electron shells.
D)  the potential energy of the valence shell.
E)  the energy difference between the s and p orbitals.F) A) and E)
G) A) and D)

Question 8

The ionic bond of sodium chloride is formed when

Accepted Answer

A)  chlorine gains an electron from sodium.
B)  sodium and chlorine share an electron pair.
C)  sodium and chlorine both lose electrons from their outer valence shells.
D)  sodium gains an electron from chlorine.
E)  chlorine gains a proton from sodium.F) B) and E)
G) A) and D)

Question 9

One difference between carbon-12 (  126\begin{array} { r } 12 \6\end{array}126​  C) and carbon-14 (  146\begin{array} { r } 14 \6\end{array}146​  C) is that carbon-14 has

Accepted Answer

A)  two more protons than carbon-12.
B)  two more electrons than carbon-12.
C)  two more neutrons than carbon-12.
D)  A and C only
E)  B and C only F) D) and E)
G) A) and B)

Question 10

An atom with an atomic number of 9 and a mass number of 19 would have an atomic mass of approximately

Accepted Answer

A)  9 daltons.
B)  9 grams.
C)  10 daltons.
D)  20 grams.
E)  19 daltons.F) A) and E)
G) A) and D) E

Question 11

Please refer to Figure 2.1 to answer the following questions.

-Which drawing depicts an atom with a valence of 3?

Accepted Answer

The answer of Please refer to Figure 2.1 to answer...

Question 12

If an atom of sulfur (atomic number 16) were allowed to react with atoms of hydrogen (atomic number 1) , which of the molecules below would be formed?

Accepted Answer

A)  S- H
B)  H- S -H
C)   
D)   
E)  H=S=HF) B) and D)
G) B) and C)

Question 13

Atoms can be represented by simply listing the number of protons, neutrons, and electrons for example, 2p⁺; 2n⁰; 2e⁻ for helium. Which one of the following lists represents the 18O isotope of oxygen?

Accepted Answer

A)  6p⁺; 8n⁰; 6e⁻
B)  8p⁺; 10n⁰; 8e⁻
C)  9p⁺; 9n⁰; 9e⁻
D)  7p⁺; 2n⁰; 9e⁻
E)  10p⁺; 8n⁰; 9e⁻F) None of the above
G) A) and D)

Question 14

Please refer to Figure 2.1 to answer the following questions.

-Which drawing depicts an atom with a valence of 2?

Accepted Answer

The answer of Please refer to Figure 2.1 to answer...

Question 15

Which of the following best describes the relationship between the atoms described below?
  Atom 1  Atom 2 11H13H\begin{array} { l l } 	ext { Atom 1 } & 	ext { Atom 2 } \{ } _ { 1 } ^ { 1 } \mathrm { H } & { } _ { 1 } ^ { 3 } \mathrm { H }\end{array} Atom 1 11​H​ Atom 2 13​H​

Accepted Answer

A)  They are isomers.
B)  They are polymers.
C)  They are isotopes.
D)  They contain 1 and 3 protons, respectively.
E)  They each contain 1 neutron. F) D) and E)
G) None of the above

Question 16

Refer to the following figure to answer the following questions.
 
-Which of the following pairs of atoms would be most likely to form an ionic bond?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) C) and D)
G) B) and D)

Question 17

Which of the following explains most specifically the attraction of water molecules to one another?

Accepted Answer

A)  nonpolar covalent bond
B)  polar covalent bond
C)  ionic bond
D)  hydrogen bond
E)  hydrophobic interactionF) A) and C)
G) A) and E)

Question 18

Each element is unique and different from other elements because of the number of protons in the nuclei of its atoms. Which of the following indicates the number of protons in an atom's nucleus?

Accepted Answer

A)  atomic mass
B)  atomic weight
C)  atomic number
D)  mass weight
E)  mass numberF) A) and B)
G) B) and D)

Question 19

About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter?

Accepted Answer

A)  carbon, sodium, chlorine, nitrogen
B)  carbon, sulfur, phosphorus, hydrogen
C)  oxygen, hydrogen, calcium, sodium
D)  carbon, hydrogen, nitrogen, oxygen
E)  carbon, oxygen, sulfur, calciumF) B) and C)
G) C) and E)

Question 20

Use the information extracted from the periodic table in Figure 2.2 to answer the following questions.

-What is the maximum number of electrons in a 2p orbital of an atom?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5F) B) and C)
G) A) and B)

Exam 2: The Chemical Context of Life

A group of molecular biologists is trying to synthesize a new artificial compound to mimic the effects of a known hormone that influences sexual behavior. They have turned to you for advice. Which of the following compounds is most likely to mimic the effects of the hormone?

Correct AnswerverifiedShow Answer

Which of the following is not considered to be a weak molecular interaction?

Correct AnswerverifiedShow Answer

Please refer to Figure 2.1 to answer the following questions. -Which drawing is of an atom with the atomic number of 6?

Correct AnswerverifiedShow Answer

Which of the following molecules contains the strongest polar covalent bond?

Correct AnswerverifiedD

333 H is a radioactive isotope of hydrogen. One difference between hydrogen-1 ( 11\begin{array} { l } 1 \\1\end{array}11​ H) and hydrogen-3 ( 31\begin{array} { l } 3 \\1\end{array}31​ H) is that hydrogen-3 has

Correct AnswerverifiedShow Answer

What coefficients must be placed in the following blanks so that all atoms are accounted for in the products? C₆H₁₂O₆ → ___ C₂H₆O + ___ CO₂

Correct AnswerverifiedB

The reactivity of an atom arises from

Correct AnswerverifiedShow Answer

The ionic bond of sodium chloride is formed when

Correct AnswerverifiedShow Answer

One difference between carbon-12 ( 126\begin{array} { r } 12 \\6\end{array}126​ C) and carbon-14 ( 146\begin{array} { r } 14 \\6\end{array}146​ C) is that carbon-14 has

Correct AnswerverifiedShow Answer

An atom with an atomic number of 9 and a mass number of 19 would have an atomic mass of approximately

Correct AnswerverifiedE

Please refer to Figure 2.1 to answer the following questions. -Which drawing depicts an atom with a valence of 3?

Correct AnswerverifiedShow Answer

If an atom of sulfur (atomic number 16) were allowed to react with atoms of hydrogen (atomic number 1) , which of the molecules below would be formed?

Correct AnswerverifiedShow Answer

Atoms can be represented by simply listing the number of protons, neutrons, and electrons for example, 2p⁺; 2n⁰; 2e⁻ for helium. Which one of the following lists represents the 18O isotope of oxygen?

Correct AnswerverifiedShow Answer

Please refer to Figure 2.1 to answer the following questions. -Which drawing depicts an atom with a valence of 2?

Correct AnswerverifiedShow Answer

Which of the following best describes the relationship between the atoms described below? Atom 1 Atom 2 11H13H\begin{array} { l l } \text { Atom 1 } & \text { Atom 2 } \\{ } _ { 1 } ^ { 1 } \mathrm { H } & { } _ { 1 } ^ { 3 } \mathrm { H }\end{array} Atom 1 11​H​ Atom 2 13​H​

Correct AnswerverifiedShow Answer

Refer to the following figure to answer the following questions. -Which of the following pairs of atoms would be most likely to form an ionic bond?

Correct AnswerverifiedShow Answer

Which of the following explains most specifically the attraction of water molecules to one another?

Correct AnswerverifiedShow Answer

Each element is unique and different from other elements because of the number of protons in the nuclei of its atoms. Which of the following indicates the number of protons in an atom's nucleus?

Correct AnswerverifiedShow Answer

About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter?

Correct AnswerverifiedShow Answer

Use the information extracted from the periodic table in Figure 2.2 to answer the following questions. -What is the maximum number of electrons in a 2p orbital of an atom?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
D

$3$ H is a radioactive isotope of hydrogen. One difference between hydrogen-1 ( $\begin{array} { l } 1 \\1\end{array}$ H) and hydrogen-3 ( $\begin{array} { l } 3 \\1\end{array}$ H) is that hydrogen-3 has

Correct Answer
verified

What coefficients must be placed in the following blanks so that all atoms are accounted for in the products? C₆H₁₂O₆ → _ C₂H₆O + _ CO₂

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified

One difference between carbon-12 ( $\begin{array} { r } 12 \\6\end{array}$ C) and carbon-14 ( $\begin{array} { r } 14 \\6\end{array}$ C) is that carbon-14 has

Correct Answer
verified

Correct Answer
verified
E

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which of the following best describes the relationship between the atoms described below? $\begin{array} { l l } \text { Atom 1 } & \text { Atom 2 } \\{ } _ { 1 } ^ { 1 } \mathrm { H } & { } _ { 1 } ^ { 3 } \mathrm { H }\end{array}$

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified