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Chemistry Ch. 7-9 > Chapter 9 > Flashcards

Chapter 9 Flashcards

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1
Q

The electrostatic force that holds ions together in an ionic compounds

A

Ionic bond

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2
Q

Get stability by adopting a noble gas configuration

A

Isoelectronic

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3
Q

Chemical bond in which 2 or more electrons are shared by 2 atoms

A

Covalent bonds

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4
Q

Bond lengths

A

Triple

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5
Q

Covalent bond with greater electron density around one of the 2 atoms

Sharing not equal

A

Polar covalent bond

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6
Q

Atoms form ions to _____

A

To become more stable

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7
Q

metals _____ valence electrons to form ____

A

Loose, cations

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8
Q

Elements share electrons

A

Covalent

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9
Q

_____ never have dots

_____ always have dots

A

Cation

Anions

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10
Q

The ability of an atom to attract the electrons in a chemical bonds

A

Electronegativity

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11
Q

What has the highest measurable electron affinity?

A

Chlorine

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12
Q

What is the highest electronegativity?

A

Florine

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13
Q

Classification of bonds by difference in electronegativity
0
>2
0

A

Covalent
Ionic
Polar covalent

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14
Q

Increasing difference in electronegativity

Covalent
Polar covalent
Ionic

A

Share electrons
Partial transfer of electrons
Transfer of electrons

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15
Q

In Lewis structures…
Put _____ electronegative element in center

Complete an octet for all atoms except _____

A

Least

Hydrogen

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16
Q

The difference between the number of valence electrons in an isolated atom and the number of electron assigned to that atom in a Lewis structure

A

Formal change

17
Q

Formal charge equation

A

Formal charge = total number of valance electrons - total dots - 1/2 total number of bonds (lines)

18
Q

Lewis structures with large formal changes are ______________ than those with small formal charges

A

Less plausible

19
Q

______ formal charges should be placed on the more electronegative atoms

A

Negative

20
Q

One of two or more Lewis structures for a single molecule that cannot be represented accurately but only one Lewis structure

A

Resonance structure

21
Q

The one with ____ electronegativity suffers

A

Less

22
Q

Exceptions to the octet

A

Incomplete octet
Odd electron molecules
The expanded octet

23
Q

The enthalpy change required to break a particular bond in one mole of gaseous molecules is _________

A

Bond enthalpy

24
Q

Enthalpy change formula

A

Sum of reaction -sum products

25
Q

The outer shell electrons of an atom

Electron that participate in chemical bonding

A

Valence electrons

Chemistry Ch. 7-9 (4 decks)

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