Chemical Bonding

Question 0

Forces between molecules , weaker than between atoms

Answer 0

Intermolecular forces

Question 1

Atoms in molecules are held together by chemical bonds which are also called

Answer 1

Intramolecular bonds

Question 2

How many valence electrons can hydrogen and helium have ?

Answer 2

2

Question 3

How many valence electrons can lithium have?

Answer 3

2

Question 4

How many valence electrons can beryllium have ?

Answer 4

4

Question 5

How many valence electrons can boron have ?

Answer 5

6

Question 6

Beyond the _ row, elements can expand their Octets to more than 8 electrons

Answer 6

2nd

Question 7

Form crystal lattices, have high melting and boiling points, conduct electricity except in solid state

Answer 7

Ionic compounds

Question 8

Low melting points, do not conduct electricity , weak intermolecular forces

Answer 8

Covalent compounds

Question 9

The number of shared electron pairs between two atoms

Answer 9

Bond order

Question 10

As bond length increases, bond energy ?

Answer 10

Decreases

Question 11

Increase in number of shared electrons caused a ____ in bond length

Answer 11

Decrease

Question 12

The energy required to separate two bonded atoms. This increases as the number of shared electrons increases.

Answer 12

Bond energy

Question 13

Formal negative charge should go on the most _______ atom

Answer 13

Electronegative

Question 14

A dipole moment is measured in vector quantity u measured in ____ units

Answer 14

Debye (coulomb-meters)

Question 15

Dipole moment equation

Answer 15

U= q(product of charge magnitude) x r(distance between two partial charges)

Question 16

In this type of bond the shared electron pair come from the lone pair of one of the atoms in the molecule

Answer 16

Coordinate covalent bond

Question 17

Compound that can accept an electron pair to form a covalent bond

Answer 17

Lewis acid

Question 18

Compound that can donate an electron pair to form a covalent bond

Answer 18

Lewis base

Question 19

Structure that has 4 electron pairs and no nonbonding pairs

Answer 19

Tetrahedral(109.5)

Question 20

4 electron pairs , 1 non bonding pairs

Answer 20

Trigonal pyramid

Question 21

4 electron pairs , 2 non bonding pairs

Answer 21

Bent (104.5)

Question 22

5 electron pairs no non bonding pairs

Answer 22

Trigonal bipyramidal (90,120,180)

Question 23

6 electron pairs , no non bonding pairs

Answer 23

Octahedral (90,180)

Question 24

3 electron pairs , no nonbonding pairs

Answer 24

Trigonal pyramid (120)

Question 25

If the sign of two overlapping orbitals are the same, what is formed ?

Answer 25

A bonding orbital

Question 26

If the signs of two atomic orbitals overlapping are different , what is formed?

Answer 26

An anti bonding orbital

Question 27

When two orbitals of different atoms overlap head to head , what is formed ?

Answer 27

A sigma bond

Question 28

When paralleled p orbitals interact, what is formed ?

Answer 28

A pi bond

Question 29

What is the order in decreasing strength for the intermolecular forces ?

Answer 29

Ionic bonds (dipole-ion) > hydrogen bonding > dipole-dipole > LDF

Question 30

Hydrogen bonding occurs even hydrogen is bound to either?

Answer 30

Fluorine oxygen nitrogen

Question 31

What kinds of compounds are drawn into a magnetic field ?

Answer 31

Paramagnetic molecules. These are any compound having an odd number of valence electrons.

Question 32

What two elements with hydrides contain incomplete Octets?

Answer 32

Be and B because they can join to only two or three H respectively and they have fewer than 4 electrons. Mg, Al may also do this as well as Na,Ca and other active metals of groups 1A and 2 A