Question 1

A valence shell is best described as

Accepted Answer

A)  the electron shell closest to the nucleus.
B)  the outermost electron shell of an atom.
C)  the volume of space in which electrons are most often found.
D)  the original energy level of electrons in photosynthesis.E) C) and D)
F) A) and B)

Question 2

Which of the following substances attract water molecules?

Accepted Answer

A)  a nonpolar substance
B)  a polar substance
C)  an ionic substance
D)  Both polar and ionic substances.
E)  All of the above will attract water molecules.F) All of the above
G) A) and E)

Question 3

Which statement is NOT true about ionic bonds?

Accepted Answer

A)  One atom acts as an electron donor and another atom acts as an electron acceptor.
B)  Electrons are completely lost or gained in ion formation.
C)  An ion has the same number of electrons as a nonionic atom of the same element.
D)  An ionic bond occurs between positive ions and negative ions.
E)  A salt such as NaCl is formed by an ionic reaction.F) B) and D)
G) B) and C)

Question 4

The electrons are unequally shared in ________,and transferred in ________.

Accepted Answer

A)  H2O; Na+Cl-
B)  O2; CH4
C)  Na+Cl-; H2O
D)  CH4; N2E) B) and D)
F) All of the above

Question 5

What is the maximum number of electrons that will be in the first valence shell?

Accepted Answer

A)  two
B)  one
C)  three
D)  six
E)  eightF) A) and D)
G) D) and E)

Question 6

Human blood has a pH of about 7.4.This is

Accepted Answer

A)  neutral.
B)  very acidic.
C)  slightly acidic.
D)  slightly basic.E) B) and C)
F) A) and C)

Question 7

If the atomic number of chlorine is 17 and the atomic mass is 35,how many neutrons are there in the nucleus?

Accepted Answer

A)  17
B)  18
C)  35
D)  70E) A) and B)
F) A) and C)

Question 8

The periodic table gives the following information about oxygen: 8
O
15.99
A scientific article that you are reading mentions oxygen-18.How is oxygen-18 different from the typical oxygen atom described in the periodic table? Select all that apply.

Accepted Answer

A)  Oxygen-18 is an isotope.
B)  Oxygen-18 has 10 additional protons.
C)  Oxygen-18 has 2 additional neutrons.
D)  Oxygen-18 has a full valence shell and is therefore nonreactive.
E)  Oxygen-18 has more protons and fewer neutrons than a typical oxygen atom.F) D) and E)
G) A) and E)

Question 9

How many atoms are required to form a molecule?

Accepted Answer

A)  at least two
B)  at least three
C)  at least four
D)  at least five
E)  only oneF) B) and D)
G) B) and E)

Question 10

The mass number refers to the number of ________ and ________ within an element.

Accepted Answer

A)  protons; neutrons
B)  protons; electrons
C)  electrons; neutrons
D)  protons; molecules
E)  electrons; atomsF) None of the above
G) B) and C)

Question 11

A solution with a pH of 7.0 has ________ times ________ H+ than a solution of pH 10.

Accepted Answer

A)  30; more
B)  300; less
C)  1000; more
D)  1000; less
E)  None of these are correct.F) A) and B)
G) A) and C)

Question 12

The characteristic way in which atoms of an element react is most related to the

Accepted Answer

A)  number of electrons in the valence shell.
B)  number of electrons in the innermost shell.
C)  number of neutrons in the nucleus.
D)  size of the nucleus.E) B) and D)
F) C) and D)

Question 13

To determine the age of fairly recent fossils and organic artifacts,it is possible to analyze the amounts of the isotopes 14C and 14N,because over time the 14C-which originated in the atmosphere-breaks down into 14N through a process known as beta decay.What net change occurred for this to happen?

Accepted Answer

A)  The 14C lost an electron.
B)  The 14C gained an electron.
C)  The 14C lost a proton.
D)  The 14C gained a proton.
E)  The 14C gained a neutron.F) D) and E)
G) A) and E)

Question 14

A coastal climate is moderated primarily by which of the following properties of water? Water

Accepted Answer

A)  is the universal solvent.
B)  is cohesive and adhesive.
C)  has a high heat of evaporation.
D)  has a high surface tension.E) None of the above
F) A) and C)

Question 15

Which term refers to the attraction of water molecules to one another?

Accepted Answer

A)  adhesion
B)  cohesion
C)  hydrolysis
D)  photolysis
E)  polarityF) A) and B)
G) None of the above

Question 16

Which is NOT true about the electrical charges of elements?

Accepted Answer

A)  Protons carry a positive charge.
B)  In an atom,the number of protons and neutrons must be equal.
C)  An atom is neutral when the positive and negative charges balance.
D)  Neutrons have no electrical charge.E) None of the above
F) B) and C)

Question 17

From the below table,it is apparent that   Bond  Energy (kcal/mol) C−C83C=C146C−O84C=O170\begin{array} { cc} 	ext { Bond } & 	ext { Energy } ( \mathrm { kcal } / \mathrm { mol } )  \\mathrm { C } - \mathrm { C } & 83 \\mathrm { C } = \mathrm { C } & 146 \\mathrm { C } - \mathrm { O } & 84 \\mathrm { C } = \mathrm { O } & 170\end{array} Bond C−CC=CC−OC=O​ Energy (kcal/mol) 8314684170​

Accepted Answer

A)  double bonds are stronger than single bonds.
B)  double bonds are weaker than single bonds.
C)  carbon bonds are the strongest bonds.
D)  carbon forms only single bonds. E) A) and B)
F) All of the above

Question 18

Prior to prescription medications to control stomach acid and heart burn,people consumed baking soda (sodium bicarbonate) to alleviate their symptoms.To be effective,baking soda must:

Accepted Answer

A)  effectively buffer stomach acid by releasing H+.
B)  release water and dilute the stomach acid.
C)  block acid production by combining with OH-.
D)  neutralize stomach acid by combining with excess H+.E) B) and D)
F) A) and D)

Question 19

Which statement is NOT true about subatomic particles?

Accepted Answer

A)  Protons are found in the nucleus.
B)  Neutrons have no electrical charge.
C)  Electrons contain much less mass than neutrons.
D)  Electrons are found in orbitals around the nucleus.
E)  All electrons in an atom contain the same amount of energy.F) A) and D)
G) B) and D)

Question 20

If you place the corner of a paper towel into a droplet of water,the water moves into the paper towel.Which of the following would explain the movement of the water?

Accepted Answer

A)  surface tension
B)  cohesion
C)  adhesion
D)  Both cohesion and adhesion.E) B) and D)
F) B) and C)

Exam 2: Basic Chemistry

A coastal climate is moderated primarily by which of the following properties of water? Water

Correct Answer
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Which is NOT true about the electrical charges of elements?

Correct Answer
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What is the maximum number of electrons that will be in the first valence shell?

Correct Answer
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The characteristic way in which atoms of an element react is most related to the

Correct Answer
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Which statement is NOT true about subatomic particles?

Correct Answer
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From the below table,it is apparent that $\begin{array} { cc} \text { Bond } & \text { Energy } ( \mathrm { kcal } / \mathrm { mol } ) \\\mathrm { C } - \mathrm { C } & 83 \\\mathrm { C } = \mathrm { C } & 146 \\\mathrm { C } - \mathrm { O } & 84 \\\mathrm { C } = \mathrm { O } & 170\end{array}$

Correct Answer
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A solution with a pH of 7.0 has times H⁺ than a solution of pH 10.

Correct Answer
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A valence shell is best described as

Correct Answer
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How many atoms are required to form a molecule?

Correct Answer
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Which term refers to the attraction of water molecules to one another?

Correct Answer
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The mass number refers to the number of and within an element.

Correct Answer
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Which of the following substances attract water molecules?

Correct Answer
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Human blood has a pH of about 7.4.This is

Correct Answer
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If the atomic number of chlorine is 17 and the atomic mass is 35,how many neutrons are there in the nucleus?

Correct Answer
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Prior to prescription medications to control stomach acid and heart burn,people consumed baking soda (sodium bicarbonate) to alleviate their symptoms.To be effective,baking soda must:

Correct Answer
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The electrons are unequally shared in ,and transferred in .

Correct Answer
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If you place the corner of a paper towel into a droplet of water,the water moves into the paper towel.Which of the following would explain the movement of the water?

Correct Answer
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The periodic table gives the following information about oxygen: 8 O 15.99 A scientific article that you are reading mentions oxygen-18.How is oxygen-18 different from the typical oxygen atom described in the periodic table? Select all that apply.

Correct Answer
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Which statement is NOT true about ionic bonds?

Correct Answer
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Exam 2: Basic Chemistry

A coastal climate is moderated primarily by which of the following properties of water? Water

Correct AnswerverifiedShow Answer

Which is NOT true about the electrical charges of elements?

Correct AnswerverifiedShow Answer

What is the maximum number of electrons that will be in the first valence shell?

Correct AnswerverifiedShow Answer

The characteristic way in which atoms of an element react is most related to the

Correct AnswerverifiedShow Answer

To determine the age of fairly recent fossils and organic artifacts,it is possible to analyze the amounts of the isotopes 14C and 14N,because over time the 14C-which originated in the atmosphere-breaks down into 14N through a process known as beta decay.What net change occurred for this to happen?

Correct AnswerverifiedShow Answer

Which statement is NOT true about subatomic particles?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A solution with a pH of 7.0 has ________ times ________ H+ than a solution of pH 10.

Correct AnswerverifiedShow Answer

A valence shell is best described as

Correct AnswerverifiedShow Answer

How many atoms are required to form a molecule?

Correct AnswerverifiedShow Answer

Which term refers to the attraction of water molecules to one another?

Correct AnswerverifiedShow Answer

The mass number refers to the number of ________ and ________ within an element.

Correct AnswerverifiedShow Answer

Which of the following substances attract water molecules?

Correct AnswerverifiedShow Answer

Human blood has a pH of about 7.4.This is

Correct AnswerverifiedShow Answer

If the atomic number of chlorine is 17 and the atomic mass is 35,how many neutrons are there in the nucleus?

Correct AnswerverifiedShow Answer

Prior to prescription medications to control stomach acid and heart burn,people consumed baking soda (sodium bicarbonate) to alleviate their symptoms.To be effective,baking soda must:

Correct AnswerverifiedShow Answer

The electrons are unequally shared in ________,and transferred in ________.

Correct AnswerverifiedShow Answer

If you place the corner of a paper towel into a droplet of water,the water moves into the paper towel.Which of the following would explain the movement of the water?

Correct AnswerverifiedShow Answer

The periodic table gives the following information about oxygen: 8 O 15.99 A scientific article that you are reading mentions oxygen-18.How is oxygen-18 different from the typical oxygen atom described in the periodic table? Select all that apply.

Correct AnswerverifiedShow Answer

Which statement is NOT true about ionic bonds?

Correct AnswerverifiedShow Answer

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A solution with a pH of 7.0 has times H⁺ than a solution of pH 10.

Correct Answer
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The mass number refers to the number of and within an element.

Correct Answer
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The electrons are unequally shared in ,and transferred in .

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