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Chemistry > Ch. 9 Covalent Bonding > Flashcards

Ch. 9 Covalent Bonding Flashcards

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1
Q

Covalent bond

A

When sharing of electrons occurs, the attachment between atoms that results

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2
Q

Exothermic

A

When an attachment is formed, bond dissociation energy is released

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3
Q

Molecule

A

When tow or more atoms bond by means of electron sharing the resulting particle

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4
Q

Sigma bond

A

The attachment of electrons shared are centered between the two atoms

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5
Q

Pi bond

A

The attachment that involves the sharing the overlap of parallel orbitals

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6
Q

In what form do elements such as hydrogen, nitrogen, and oxygen normally occur?

A

As molecules containing two atoms

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7
Q

How many electrons are shared in a double covalent bond ?

A

4

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8
Q

Bond length is the distance between ______

A

The nuclei of two attached atoms

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9
Q

Bond length

A

The shorter the bond the stronger the bond

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10
Q

True or false ?

Binary molecular compound are generally composed of a metal and a nonmetal

A

False

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11
Q

True or false ?

The second element in the formula of a binary compound is named using the suffix - ite

A

False

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12
Q

True or false ?

The prefix - tetra indicates three Atoms

A

False

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13
Q

True or false ?

Prefix hexa indicates six atoms

A

True

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14
Q

True or false ?

Naming the first element in a formula the prefix mono is not used

A

True

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15
Q

True or false ?

For binary acids the hydrogen part of the compound is named using the prefix hydro

A

True

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16
Q

True or false ?

An oxyacid contains only two elements

A

False

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17
Q

True or false ?

The name of the anion of an oxyacid ends in - ate ,the acid name contains the suffix -ous

A

False

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18
Q

True or false ?

A structural formula shows the arrangement of the atoms in a molecule

A

True

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19
Q

True or false ?

The central Atom in a molecule is the one with the highest electron affinity

A

False

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20
Q

True or false ?

In Molecules hydrogen is always a terminal atom

A

True

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21
Q

True or false ?

The Number of bonding pairs in a molecule is equal to the number of electrons

A

False

22
Q

True or false ?
To find the total number of electrons available for bonding in a positive ion you should add the ion charge to the total of valance electrons of the atoms present

A

False

23
Q

True or false ?

The electrons in a coordinate covalent bond are donated by both the bonded atoms

A

False

24
Q

True or false ?

Resonance occurs when more than one valid Lewis structure can be written for a molecule

A

True

25
Q

True or false ?

Nitrate is an example of an ion that forms resonance structures

A

True

26
Q

True or false ?

The carbon dioxide molecule contains two double bonds

A

True

27
Q

True or false ?

All electrons in an atom are available for bonding

A

False

28
Q

True or false ?

In the sulfate ion 32 electrons are available for bonding

A

True

29
Q

True or false ?

When carbon oxygen bond the molecule contains 10 pairs of bonding electrons

A

False

30
Q

O,3

A

More than one valid Lewis structure

31
Q

BF,3

A

Fewer than eight electrons around an atom

32
Q

NO

A

Odd number of valance electrons

33
Q

SF,6

A

More than eight electrons around central atom

34
Q

VSEPER model

A

Is used mainly to determine molecular shape

35
Q

The bond angle is the angle between

A

Two terminal atoms and the central atom

36
Q

The VESPER model is based on the idea that

A

Shared and unshared electron pair repel each other as much as possible

37
Q

Tetrahedral

A

Shape of a molecule who central Atom has four pairs of bonding electrons

38
Q

Trigonal pyramidal

A

Shape of a molecule that has three single covalent bonds and one lone pair on the central Atom

39
Q

Hybridization

A
  • Formation of new orbitals from a combination or rearrangement of valance electrons
  • The orbitals are produced in this way are identical to one another
40
Q

Sp,3

A
  • When this Atom combines and 3P orbitals and it’s one S orbital the orbitals that result
  • methane is an ex
41
Q

Electronegativity

A

Tendency of an Atom to attract electrons

42
Q

True or false?

ionic compounds are usually consolable and polar substances

A

True

43
Q

True or false ?

In a covalent bond molecular compound the attraction between molecules tend to be strong

A

False

44
Q

Polar covalent bond

A

Unequal sharing of electrons between two bonded atoms

45
Q

Electronegativities of two bonded atoms differ greatly the bond is

A

Ionic

46
Q

What is the electronegativity difference that usually is the dividing line between covalent and ionic bond?

A

1.7

47
Q

Nonpolar covalent bond

A

Electrons are shared equally

48
Q

Molecules containing only polar covalent bonds

A

May or may not be polar

49
Q

What factor other than electronegativity determines whether a molecule as a whole is polar or not?

A

It’s geometry

50
Q

H2O

A

Polar overall with polar covalent bonds

Chemistry (13 decks)

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