CHAPTER 3: IONIC AND COVALENT COMPOUNDS CPQ

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52 Terms

1
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What is the BEST name for the compound SF6, a potent greenhouse gas?


sulfur hexafluoride


2
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A cation has __________ electrons and is ________ charged.


lost; positively


3
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Iron(II) is an example of a(n) ________.


cation


4
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How many valence electrons does chlorine have?


7


5
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Below are two charged particles. What will they do when in close proximity to one another?


They will attract one another.


6
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What is the name of CaCO3, a common calcium supplement and antacid?


calcium carbonate


7
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Lead(II) is especially harmful to young children because it_________.


harms brain development


8
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In an ionic compound


cations and anions are attracted to one another.


9
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Carbon tetrafluoride is a refrigerant and potent greenhouse gas. Which of the following is the molecular formula for this compound?


CF4


10
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Another name for an ionic compound is a(n) ________.


salt

11
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Which of the following is the formula for an ionic compound called iron(III) oxide?


Fe2O3

12
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Which of the following is a diatomic element?

  • N2

  • NaCl

  • Li2O

  • CO

  • H2O

N2

13
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An ion of fluorine has ten electrons total. What is the charge of the fluorine ion?


-1

14
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In the methane molecule (complete the sentence)

  • carbon is very unstable.

  • carbon does not have an octet of electrons.

  • carbon has donated four electrons to hydrogen, leaving it with a charge of +4.

  • carbon is sharing its four electrons with the hydrogens.

  • hydrogen has eight electrons in its valence shell.

  • carbon is sharing its four electrons with the hydrogens.

15
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Below are two ions (not drawn to scale). What will they do when in close proximity to one another?

They will attract one another, forming an ionic compound.


16
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How many electrons are shared by the circled carbon and oxygen of acetone?


4

17
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The total number of valence electrons in methane is


8

18
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Which of the following Lewis dot structures best represents the chlorine atom?


structure b


19
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Which of the following describes 16O2–?

Protons

Neutrons

Electrons

a.

8

8

10

b.

8

8

6

c.

16

16

14

d.

16

16

16

e.

6

12

8


choice a


20
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What is the charge on iron in the ionic compound FeCl3?


+3


21
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______ is a waste product excreted by the kidneys. It is a product of the breakdown of proteins.


Urea


22
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Which statement BEST describes the meaning of an expanded octet?


  • "Expanded octets" is a term that describes atoms that have more than eight electrons in their valence shells.

  • "Expanded octets" is used to describe elements that do not normally form an octet when bonded and would therefore have to expand to form the octet.

  • "Expanded octets" is used to describe how atoms accept electrons to attain a full valence shell.

  • "Expanded octets" refers to atoms that, when bonded, must be larger than normal.

  • "Expanded octets" are molecules in which an element expands its valence shell to gain an octet of electrons.

  • "Expanded octets" is a term that describes atoms that have more than eight electrons in their valence shells.

23
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Electrons shared between two atoms is a(n) _______.


covalent bond


24
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Lewis electron dot structures represent the


number of valence electrons.


25
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What ionic compound has the formula Na2O?


sodium oxide


26
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Which of the following statements about the adenosine receptor is NOT true?

  • When adenosine is bound, a signal is sent to the cell to slow activity.

  • The receptor only binds adenosine.

  • Its normal signaling is blocked when caffeine binds.

  • It is involved in preparing the brain for sleep.

  • The receptor is found embedded in the cell membrane of neurons.

  • The receptor only binds adenosine.

27
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What is the ionic formula for the ionic compound composed of calcium and chloride ions?


CaCl2


28
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The arrow is pointing to a(n)

single bond.


29
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A compound contains magnesium and phosphate. What is the formula unit of this compound?


Mg3(PO4)2


30
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Magnesium chloride is sometimes administered orally to suppress premature labor. Which of the following is a valid ionic formula for magnesium chloride?

  • None of the above choices are magnesium chloride

  • MgCl

  • Mg2Cl

  • Mg2Cl2

  • MgCl2

MgCl2


31
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What is the name of Na2SO3, a preservative in many foods and drinks?


sodium sulfite


32
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Below is an illustration of an atom of fluorine. Which arrow points to the part of the atom involved in bonding?


C

33
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The name of Al3+ is ____________.


aluminum ion


34
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Which is the BEST Lewis structure for a molecule with the formula HCN?


structure e


35
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What is the total number of valence electrons in the chloroethylene molecule (C2H3Cl)?


18

36
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Which of the following statements about caffeine is TRUE?


  • It is consumed by the majority of North Americans.

  • Caffeine is a compound.

  • Caffeine activates the pleasure centers of the brain.

  • All of the above statements about caffeine are true.

  • Caffeine binds to the adenosine receptor.

  • All of the above statements about caffeine are true.

37
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What is the name of CS2, an industrial solvent?


carbon disulfide


38
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Nonmetals typically ______, and metals typically ______.


accept electrons; donate electrons


39
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Which of the following is the formula for an ionic compound called iron(II) oxide?


FeO


40
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Which is the BEST Lewis structure for a molecule with the formula C2H3Cl?


structure c

41
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An atom of magnesium is shown below. The charge on this ion is _______ making the ion a _______.


+ 2; cation


42
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Oxygen is a _______ and therefore _______ when it forms an ion.


nonmetal; gains electrons


43
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A high level of ______ after 12 hours of fasting indicates diabetes.


glucose


44
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The conventional way of writing the symbol for an ion of calcium is


Ca2+


45
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______ is necessary for signaling in neurons and muscle cells.


Potassium


46
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"Laughing gas" has the formula N2O. Which of the following is the best name for this compound?


dinitrogen monoxide


47
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An ion that has more electrons than protons is a(n) ________.


anion


48
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Elements in group 1A of the periodic table are likely to form ions with the charge


+1


49
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Which of the following ions is a polyatomic ion?


NH4+


50
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Which of the molecules below contain an atom with an expanded octet?


I and II


51
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People on a low salt diet use a potassium chloride substitute for sodium chloride. Which of the following is a valid ionic formula for potassium chloride?


KCl


52
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How many bonds is chlorine MOST likely to form?



1