Question 1

Deuterium oxide, D2O, and water, H2O, have the same chemical structure and differ only in that D2O possesses the deuterium isotope of hydrogen, whereas water possesses the protium isotope. Deuterium oxide, also known as "heavy water," is 11 percent heavier than water. Might you expect its boiling temperature also to be about 11 percent greater? Why or why not?

Accepted Answer

A)  The mass of the molecules has a far greater influence on the boiling temperature of the substance than does the polarity of the molecules, so D2O boils at a higher temperature.
B)  Since they have the same chemical structures, there is a similar molecular attraction between the molecules, so their boiling temperatures are similar.
C)  Since deuterium is radioactive, it breaks down more easily, so it has a lower boiling temperature than water.
D)  Since boiling temperature is a measure of the speed of a molecule, the heavier molecules move slower and thus have a higher boiling temperature.E) C) and D)
F) A) and D)

Question 2

Which of the following does not describe ionic compounds?

Accepted Answer

A)  They have a tendency to melt easily.
B)  They consist of positive and negative ions.
C)  They are held together by electrostatic attraction.
D)  They are usually very ordered.
E)  none of the aboveF) C) and E)
G) A) and E)

Question 3

Which of the following is a positive ion?

Accepted Answer

A)  Na+1
B)  Ca+2
C)  Mg+2
D)  Al+3
E)  all of the aboveF) A) and D)
G) B) and E)

Question 4

Which of the following compounds has polar covalent bonds?

Accepted Answer

A)  H₂O
B)  CsF2
C)  S8
D)  Ne
E)  CH₄F) A) and B)
G) B) and D)

Question 5

What is the difference between a dipole-dipole interaction and an ion-dipole interaction?

Accepted Answer

A)  One involves dipole attraction between neutral molecules while the other involves dipole interactions with ions.
B)  One involves hydrogen bonding while the other does not.
C)  One involves salts and water while the other doesn't involve water.
D)  One involves ionic molecules interacting with other ionic molecules while the other deals with polar molecules.
E)  none of the aboveF) A) and B)
G) B) and E)

Question 6

Which of the following would have the highest boiling point?

Accepted Answer

A)  Cl2
B)  Br2
C)  F2
D)  I₂
E)  not enough information givenF) All of the above
G) B) and E)

Question 7

Hydrogen chloride, HCl, is a gas at room temperature. Would you expect this material to be very soluble or not very soluble in water?

Accepted Answer

A)  HCl is very soluble in water by virtue of the dipole/dipole attractions occurring between the HCl and H2O molecules.
B)  It is not very soluble because it is a gas, and all gases have very low solubility in water at room temperature.
C)  HCl is very soluble in water because it is such a small molecule, there is little electrical attraction to other HCl molecules.
D)  It is not very soluble because as a gas with low density, it floats to the surface of the water and then into the surrounding atmosphere.E) C) and D)
F) B) and C)

Question 8

Which of the following has the greatest number of nonbonding pairs of electrons ?

Accepted Answer

A)  C
B)  H
C)  He
D)  F
E)  SF) C) and D)
G) All of the above

Question 9

What property of metal atoms account for many of the observed bulk phenomena seen in metal samples?

Accepted Answer

A)  Metal atoms easily lose one or more outer electrons.
B)  Metal atoms easily gain one or more outer electrons.
C)  Metals readily form ionic bonds.
D)  Metals readily form covalent bonds.
E)  none of the aboveF) A) and C)
G) C) and D)

Question 10

Many of the macroscopic properties of a compound depend on

Accepted Answer

A)  how the atoms of the molecules are held together.
B)  the mass of the constituent atoms.
C)  the number of nucleons present in the sample.
D)  the size of the sample.
E)  how the atoms absorb light and the shape of the orbitals.F) A) and B)
G) A) and E)

Question 11

How can you tell whether a sugar solution is saturated or not?

Accepted Answer

A)  Add more sugar; if it dissolves, it is saturated.
B)  There will be a precipitate if the water is heated.
C)  Cool the solution to see if there is a precipitate.
D)  As long as there are more water molecules than sugar molecules, there is a saturated solution.E) A) and D)
F) A) and C)

Question 12

Describe what usually happens to a hot solution that is saturated with a solid as it cools.

Accepted Answer

A)  The solid that is dissolved comes out of the solution completely.
B)  The solid stays in the solution.
C)  Some of the solid comes out of the solution.
D)  The solution freezes.
E)  The solution solidifies.F) A) and B)
G) B) and C)

Question 13

The following image represents which kind of matter?

Accepted Answer

A)  a mixture
B)  a compound
C)  an element
D)  none of the above
E)  all of the aboveF) A) and B)
G) C) and D)

Question 14

Which of the following compounds contains ionic bonds?

Accepted Answer

A)  CH4
B)  K2O
C)  Cl2
D)  OF2
E)  none of the aboveF) All of the above
G) C) and D)

Question 15

Why are the melting temperatures of most ionic compounds far greater than the melting temperatures of most covalent compounds?

Accepted Answer

A)  Ionic bonds are so much stronger than the molecular attractions between covalently bonded compounds.
B)  Covalent bonds are not as strong as ionic bonds.
C)  As a solid, salts have a very organized crystalline structure which takes a lot of energy to break apart.
D)  Most covalent compounds have at least one weak bond in their structure that is easily broken when heat is added.E) B) and C)
F) A) and D)

Question 16

Is an ionic compound an example of a chemical compound, or is a chemical compound an example of an ionic compound?

Accepted Answer

A)  A chemical compound is an example of an ionic compound.
B)  Neither is an example of the other.
C)  Each is an example of the other.
D)  An ionic compound is an example of a chemical compound.E) C) and D)
F) None of the above

Question 17

Which of the following would have the smallest number of induced dipole-induced dipole interactions?

Accepted Answer

A)  C₆H14
B)  C8H18
C)  C10H₂2
D)  C₁₂H₂6
E)  not enough information givenF) A) and E)
G) C) and E)

Question 18

List the following compounds in order of increasing boiling point: Cl4, CBr4, CCl4, CF4.

Accepted Answer

A)  Cl4, CBr4, CCl4, CF4
B)  CF4, CBr4, CCl4, Cl4
C)  Cl4, CCl4, CBr4, CF4
D)  CF4, CCl4, CBr4, Cl4E) C) and D)
F) A) and C)

Question 19

Which of the following would be considered a heterogeneous mixture?

Accepted Answer

A)  salad dressing
B)  water
C)  milk
D)  vegetable oil
E)  vinegarF) A) and C)
G) A) and E)

Question 20

Which of the following molecules contains a polar bond?

Accepted Answer

A)  H-F
B)  Cl-Cl
C)  H-H
D)  F-F
E)  all of the aboveF) D) and E)
G) B) and D)

Exam 12: Chemical Bonds and Mixtures

What is the difference between a dipole-dipole interaction and an ion-dipole interaction?

Correct Answer
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The following image represents which kind of matter?

Correct Answer
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Which of the following would have the highest boiling point?

Correct Answer
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Which of the following would be considered a heterogeneous mixture?

Correct Answer
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Which of the following compounds has polar covalent bonds?

Correct Answer
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Which of the following compounds contains ionic bonds?

Correct Answer
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Describe what usually happens to a hot solution that is saturated with a solid as it cools.

Correct Answer
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Hydrogen chloride, HCl, is a gas at room temperature. Would you expect this material to be very soluble or not very soluble in water?

Correct Answer
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Which of the following is a positive ion?

Correct Answer
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Which of the following molecules contains a polar bond?

Correct Answer
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Which of the following does not describe ionic compounds?

Correct Answer
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Why are the melting temperatures of most ionic compounds far greater than the melting temperatures of most covalent compounds?

Correct Answer
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Which of the following has the greatest number of nonbonding pairs of electrons ?

Correct Answer
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Is an ionic compound an example of a chemical compound, or is a chemical compound an example of an ionic compound?

Correct Answer
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List the following compounds in order of increasing boiling point: Cl₄, CBr₄, CCl₄, CF₄.

Correct Answer
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Which of the following would have the smallest number of induced dipole-induced dipole interactions?

Correct Answer
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What property of metal atoms account for many of the observed bulk phenomena seen in metal samples?

Correct Answer
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Many of the macroscopic properties of a compound depend on

Correct Answer
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How can you tell whether a sugar solution is saturated or not?

Correct Answer
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Exam 12: Chemical Bonds and Mixtures

What is the difference between a dipole-dipole interaction and an ion-dipole interaction?

Correct AnswerverifiedShow Answer

The following image represents which kind of matter?

Correct AnswerverifiedShow Answer

Which of the following would have the highest boiling point?

Correct AnswerverifiedShow Answer

Which of the following would be considered a heterogeneous mixture?

Correct AnswerverifiedShow Answer

Which of the following compounds has polar covalent bonds?

Correct AnswerverifiedShow Answer

Which of the following compounds contains ionic bonds?

Correct AnswerverifiedShow Answer

Describe what usually happens to a hot solution that is saturated with a solid as it cools.

Correct AnswerverifiedShow Answer

Hydrogen chloride, HCl, is a gas at room temperature. Would you expect this material to be very soluble or not very soluble in water?

Correct AnswerverifiedShow Answer

Which of the following is a positive ion?

Correct AnswerverifiedShow Answer

Which of the following molecules contains a polar bond?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following does not describe ionic compounds?

Correct AnswerverifiedShow Answer

Why are the melting temperatures of most ionic compounds far greater than the melting temperatures of most covalent compounds?

Correct AnswerverifiedShow Answer

Which of the following has the greatest number of nonbonding pairs of electrons ?

Correct AnswerverifiedShow Answer

Is an ionic compound an example of a chemical compound, or is a chemical compound an example of an ionic compound?

Correct AnswerverifiedShow Answer

List the following compounds in order of increasing boiling point: Cl4, CBr4, CCl4, CF4.

Correct AnswerverifiedShow Answer

Which of the following would have the smallest number of induced dipole-induced dipole interactions?

Correct AnswerverifiedShow Answer

What property of metal atoms account for many of the observed bulk phenomena seen in metal samples?

Correct AnswerverifiedShow Answer

Many of the macroscopic properties of a compound depend on

Correct AnswerverifiedShow Answer

How can you tell whether a sugar solution is saturated or not?

Correct AnswerverifiedShow Answer

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List the following compounds in order of increasing boiling point: Cl₄, CBr₄, CCl₄, CF₄.

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