Question 1

Isotopes that decay with a nuclear break-up and emit a significant amount of energy are said to be __________.

Accepted Answer

A)  energetic
B)  ionic
C)  radioactive
D)  isotopicE) B) and C)
F) A) and D)

Question 2

Which of the following statements about electrons is false?

Accepted Answer

A)  An electron has one negative charge.
B)  The mass of an electron is 1/1840 Dalton.
C)  Electrons are always found in the nucleus of the atom.
D)  Electrons are found in an area around the nucleus,called the orbital.E) None of the above
F) A) and D)

Question 3

The reaction (H2 + F2  →\rarr→  2HF) is an example of a redox reaction.In reality,two half reactions are occurring.The half reaction (H2  →\rarr→  2H+ + 2e-) is a(n) _______________.

Accepted Answer

A)  reduction reaction
B)  oxidation reaction
C)  redox reaction
D)  potential energy reaction E) B) and C)
F) A) and D)

Question 4

Based on the information provided,you know that acidosis means that

Accepted Answer

A)  your dog's blood pH has moved toward the acidic end of the pH scale and has a higher pH value than normal.
B)  your dog's blood pH has moved toward the acidic end of the pH scale and has a lower pH value than normal.
C)  your dog's blood pH has moved toward the basic end of the pH scale and has a higher pH value than normal.
D)  your dog's blood pH has moved toward the basic end of the pH scale and has a lower pH value than normal.E) B) and C)
F) A) and C)

Question 5

Nonpolar molecules tend to aggregate in water because they are forced to come into close proximity with each other due to

Accepted Answer

A)  ionizing interactions.
B)  hydrophilic interactions.
C)  hydrophobic interactions.
D)  dissolving interactions.
E)  sticky interactions.F) All of the above
G) A) and D)

Question 6

Based on information provided,how is sulfer-35 being used in this experiment?

Accepted Answer

A)  as a tag or label
B)  as a reaction product
C)  as a catalyst
D)  as a reaction bufferE) C) and D)
F) None of the above A

Question 7

One mole of a substance contains 6.02 x 1023 molecules.The atomic mass of Li is 3.If you have three moles of Li,how many grams does it weigh?

Accepted Answer

A)  3
B)  9
C)  1.806 x 1024
D)  cannot determine from the information providedE) C) and D)
F) B) and D) B

Question 8

Which of the following statements about protons is false?

Accepted Answer

A)  Protons have one positive charge.
B)  Protons have one Dalton of mass.
C)  Protons are always found in the nucleus of the atom.
D)  The number of protons is the same as the number of electrons.E) B) and D)
F) None of the above

Question 9

________ is defined as the negative logarithm of the hydrogen ion concentration in the solution.

Accepted Answer

A)  pH
B)  water
C)  temperature
D)  solubilityE) B) and C)
F) B) and D)

Question 10

Bohr proposed that atoms of any kind contain _________ particles.Those located in the nuclear core are called neutrons and protons.

Accepted Answer

A)  ionic
B)  molecular
C)  subatomic
D)  tinyE) None of the above
F) All of the above

Question 11

Two hydrogen atoms and one oxygen atom will combine chemically to form a water molecule.The chemical bonds that hold the molecule together are covalent bonds.These covalent bonds convey a polarity to each water molecule.Simply stated,polarity means that there is a positive side and a negative side to the molecule.The positive side of one water molecule is attracted to the negative side of another water molecule,forming a hydrogen bond.Which of the following pure water properties reflects this type of bonding?

Accepted Answer

A)  the ability to act as a buffer
B)  the ability to quench a thirst
C)  the ability to travel through xylem tubes in a plant's vascular system
D)  the ability to form hydrogen and oxygen gases
E)  the ability to conduct electricityF) A) and D)
G) C) and D)

Question 12

You have recently discovered a new element,and find that this particular element has seven electrons in its outer energy level.What does this information tell you about the reactivity of this element?

Accepted Answer

A)  The element is non-reactive.
B)  The element is mildly reactive.
C)  The element is highly reactive.
D)  You cannot determine reactivity from the information provideD.E) A) and B)
F) B) and D)

Question 13

What type of products are made in chemical reactions involving the shifting of atoms of one molecule to another?

Accepted Answer

A)  buffers
B)  reactants
C)  compounds
D)  elements
E)  ionsF) None of the above
G) B) and E)

Question 14

Elements that have atoms with the same atomic numbers but different number of neutrons are called

Accepted Answer

A)  polymers.
B)  ions.
C)  molecules.
D)  radioactive.
E)  isotopes.F) A) and B)
G) C) and D)

Question 15

There are 92 naturally occurring _______,each made up of atoms which contain a specific number of protons and a different arrangement of electrons.

Accepted Answer

A)  minerals
B)  elements
C)  metals
D)  moleculesE) A) and C)
F) A) and D)

Question 16

Based on the information provided,you know that

Accepted Answer

A)  acidosis means that your dog's blood pH has dropped from its normal level and to correct the situation an injection of saline is required to reverse the condition.
B)  acidosis means that your dog's blood pH has raised from its normal level and to correct the situation an injection of saline is required to reverse the condition.
C)  acidosis means that your dog's blood pH has dropped from its normal level and to correct the situation an injection of a buffering solution is required to reverse the condition.
D)  acidosis means that your dog's blood pH has raised from its normal level and to correct the situation an injection of a buffer is required to reverse the condition.E) A) and D)
F) None of the above

Question 17

Regardless of its shape,a given orbital may contain no more than

Accepted Answer

A)  1 electron.
B)  4 electrons.
C)  8 electrons.
D)  2 electrons.
E)  92 electrons.F) D) and E)
G) A) and B)

Question 18

Salt is often used to melt ice on roads during the winter because it lowers the freezing/melting point of water.Based on what you have learned about the nature of chemical bonds and the properties of water,how does salt exert this effect?

Accepted Answer

A)  When salt dissolves in water,individual Na+ and Cl- ions break away from the salt lattice and become surrounded by water molecules.Hydrogen bonds are broken,and the salt ions interfere with interactions between H and O.As a result,it is more difficult for water molecules to bond and form ice.
B)  When salt dissolves in water,individual Na+ and Cl- ions break away from the salt lattice and become surrounded by water molecules.Hydrogen bonds are formed,and the salt ions bond withH and O.As a result,it is more difficult for water molecules to bond and form ice.
C)  When salt dissolves in water,individual Na+ and Cl- ions break away from the salt lattice and become surrounded by water molecules.Hydrogen bonds are broken,and the salt ions bond withH and O.As a result,it is more difficult for water molecules to bond and form ice.D) A) and B)
E) A) and C)

Question 19

If the molecular weight of Tris base is 121.14,how many grams did you use?

Accepted Answer

A)  60.57
B)  121.14
C)  242.28
D)  cannot determine from the information providedE) None of the above
F) A) and B)

Question 20

Ordinary oxygen has an atomic mass of 16 and an atomic number of 8.This means that the number of neutrons in this type of oxygen is

Accepted Answer

A)  24.
B)  8.
C)  16.
D)  not stable.
E)  nonE.F) B) and C)
G) A) and D) B

Exam 2: The Nature of Molecules

Isotopes that decay with a nuclear break-up and emit a significant amount of energy are said to be __________.

Correct Answer
verified

Which of the following statements about electrons is false?

Correct Answer
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The reaction (H2 + F2 $\rarr$ 2HF) is an example of a redox reaction.In reality,two half reactions are occurring.The half reaction (H2 $\rarr$ 2H⁺ + 2e^-) is a(n) _______________.

Correct Answer
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Based on the information provided,you know that acidosis means that

Correct Answer
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Nonpolar molecules tend to aggregate in water because they are forced to come into close proximity with each other due to

Correct Answer
verified

Based on information provided,how is sulfer-35 being used in this experiment?

Correct Answer
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A

One mole of a substance contains 6.02 x 10²³ molecules.The atomic mass of Li is 3.If you have three moles of Li,how many grams does it weigh?

Correct Answer
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B

Which of the following statements about protons is false?

Correct Answer
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________ is defined as the negative logarithm of the hydrogen ion concentration in the solution.

Correct Answer
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Bohr proposed that atoms of any kind contain _________ particles.Those located in the nuclear core are called neutrons and protons.

Correct Answer
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Correct Answer
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You have recently discovered a new element,and find that this particular element has seven electrons in its outer energy level.What does this information tell you about the reactivity of this element?

Correct Answer
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What type of products are made in chemical reactions involving the shifting of atoms of one molecule to another?

Correct Answer
verified

Elements that have atoms with the same atomic numbers but different number of neutrons are called

Correct Answer
verified

There are 92 naturally occurring _______,each made up of atoms which contain a specific number of protons and a different arrangement of electrons.

Correct Answer
verified

Based on the information provided,you know that

Correct Answer
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Regardless of its shape,a given orbital may contain no more than

Correct Answer
verified

Salt is often used to melt ice on roads during the winter because it lowers the freezing/melting point of water.Based on what you have learned about the nature of chemical bonds and the properties of water,how does salt exert this effect?

Correct Answer
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If the molecular weight of Tris base is 121.14,how many grams did you use?

Correct Answer
verified

Ordinary oxygen has an atomic mass of 16 and an atomic number of 8.This means that the number of neutrons in this type of oxygen is

Correct Answer
verified
B

Exam 2: The Nature of Molecules

Isotopes that decay with a nuclear break-up and emit a significant amount of energy are said to be __________.

Correct AnswerverifiedShow Answer

Which of the following statements about electrons is false?

Correct AnswerverifiedShow Answer

The reaction (H2 + F2 →\rarr→ 2HF) is an example of a redox reaction.In reality,two half reactions are occurring.The half reaction (H2 →\rarr→ 2H+ + 2e-) is a(n) _______________.

Correct AnswerverifiedShow Answer

Based on the information provided,you know that acidosis means that

Correct AnswerverifiedShow Answer

Nonpolar molecules tend to aggregate in water because they are forced to come into close proximity with each other due to

Correct AnswerverifiedShow Answer

Based on information provided,how is sulfer-35 being used in this experiment?

Correct AnswerverifiedA

One mole of a substance contains 6.02 x 1023 molecules.The atomic mass of Li is 3.If you have three moles of Li,how many grams does it weigh?

Correct AnswerverifiedB

Which of the following statements about protons is false?

Correct AnswerverifiedShow Answer

________ is defined as the negative logarithm of the hydrogen ion concentration in the solution.

Correct AnswerverifiedShow Answer

Bohr proposed that atoms of any kind contain _________ particles.Those located in the nuclear core are called neutrons and protons.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

You have recently discovered a new element,and find that this particular element has seven electrons in its outer energy level.What does this information tell you about the reactivity of this element?

Correct AnswerverifiedShow Answer

What type of products are made in chemical reactions involving the shifting of atoms of one molecule to another?

Correct AnswerverifiedShow Answer

Elements that have atoms with the same atomic numbers but different number of neutrons are called

Correct AnswerverifiedShow Answer

There are 92 naturally occurring _______,each made up of atoms which contain a specific number of protons and a different arrangement of electrons.

Correct AnswerverifiedShow Answer

Based on the information provided,you know that

Correct AnswerverifiedShow Answer

Regardless of its shape,a given orbital may contain no more than

Correct AnswerverifiedShow Answer

Salt is often used to melt ice on roads during the winter because it lowers the freezing/melting point of water.Based on what you have learned about the nature of chemical bonds and the properties of water,how does salt exert this effect?

Correct AnswerverifiedShow Answer

If the molecular weight of Tris base is 121.14,how many grams did you use?

Correct AnswerverifiedShow Answer

Ordinary oxygen has an atomic mass of 16 and an atomic number of 8.This means that the number of neutrons in this type of oxygen is

Correct AnswerverifiedB

Correct Answer
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Correct Answer
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The reaction (H2 + F2 $\rarr$ 2HF) is an example of a redox reaction.In reality,two half reactions are occurring.The half reaction (H2 $\rarr$ 2H⁺ + 2e^-) is a(n) _______________.

Correct Answer
verified

Correct Answer
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Correct Answer
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A

One mole of a substance contains 6.02 x 10²³ molecules.The atomic mass of Li is 3.If you have three moles of Li,how many grams does it weigh?

Correct Answer
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B

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B