Ch. 9 Covalent Bonding

Question 1

Covalent bond

Answer 1

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

Question 2

Exothermic

Answer 2

When an attachment is formed, bond dissociation energy is released

Question 3

Molecule

Answer 3

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

Question 4

Sigma bond

Answer 4

The attachment of electrons shared are centered between the two atoms

Question 5

Pi bond

Answer 5

The attachment that involves the sharing the overlap of parallel orbitals

Question 6

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

Answer 6

As molecules containing two atoms

Question 7

How many electrons are shared in a double covalent bond ?

Answer 7

4

Question 8

Bond length is the distance between ______

Answer 8

The nuclei of two attached atoms

Question 9

Bond length

Answer 9

The shorter the bond the stronger the bond

Question 10

True or false ?

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

Answer 10

False

Question 11

True or false ?

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

Answer 11

False

Question 12

True or false ?

The prefix - tetra indicates three Atoms

Answer 12

False

Question 13

True or false ?

Prefix hexa indicates six atoms

Answer 13

True

Question 14

True or false ?

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

Answer 14

True

Question 15

True or false ?

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

Answer 15

True

Question 16

True or false ?

An oxyacid contains only two elements

Answer 16

False

Question 17

True or false ?

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

Answer 17

False

Question 18

True or false ?

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

Answer 18

True

Question 19

True or false ?

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

Answer 19

False

Question 20

True or false ?

In Molecules hydrogen is always a terminal atom

Answer 20

True

Question 21

True or false ?

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

Answer 21

False

Question 22

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

Answer 22

False

Question 23

True or false ?

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

Answer 23

False

Question 24

True or false ?

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

Answer 24

True

Question 25

True or false ? | Nitrate is an example of an ion that forms resonance structures

Answer 25

True

Question 26

True or false ? | The carbon dioxide molecule contains two double bonds

Answer 26

True

Question 27

True or false ? | All electrons in an atom are available for bonding

Answer 27

False

Question 28

True or false ? | In the sulfate ion 32 electrons are available for bonding

Answer 28

True

Question 29

True or false ? | When carbon oxygen bond the molecule contains 10 pairs of bonding electrons

Answer 29

False

Question 30

O,3

Answer 30

More than one valid Lewis structure

Question 31

BF,3

Answer 31

Fewer than eight electrons around an atom

Question 32

NO

Answer 32

Odd number of valance electrons

Question 33

SF,6

Answer 33

More than eight electrons around central atom

Question 34

VSEPER model

Answer 34

Is used mainly to determine molecular shape

Question 35

The bond angle is the angle between

Answer 35

Two terminal atoms and the central atom

Question 36

The VESPER model is based on the idea that

Answer 36

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

Question 37

Tetrahedral

Answer 37

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

Question 38

Trigonal pyramidal

Answer 38

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

Question 39

Hybridization

Answer 39

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

Question 40

Sp,3

Answer 40

- When this Atom combines and 3P orbitals and it's one S orbital the orbitals that result - methane is an ex

Question 41

Electronegativity

Answer 41

Tendency of an Atom to attract electrons

Question 42

True or false? | ionic compounds are usually consolable and polar substances

Answer 42

True

Question 43

True or false ? | In a covalent bond molecular compound the attraction between molecules tend to be strong

Answer 43

False

Question 44

Polar covalent bond

Answer 44

Unequal sharing of electrons between two bonded atoms

Question 45

Electronegativities of two bonded atoms differ greatly the bond is

Answer 45

Ionic

Question 46

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

Answer 46

1.7

Question 47

Nonpolar covalent bond

Answer 47

Electrons are shared equally

Question 48

Molecules containing only polar covalent bonds

Answer 48

May or may not be polar

Question 49

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

Answer 49

It's geometry

Question 50

H2O

Answer 50

Polar overall with polar covalent bonds