Unit 4: Molecules

Question 1

covalent bond

Answer 1

a sharing of electrons
results in molecules
only happens with non metals

Question 2

molecule

Answer 2

a group of atoms held together by covalent bonds

Question 3

dipole

Answer 3

a type of arrow used to show a positive side and a negative side of a polar bond or polar molecule

Question 4

polar

Answer 4

anything with two opposite sides

Question 5

single bond

Answer 5

shares two electrons

can be drawn as 2 dots or a line

Question 6

double bond

Answer 6

shares four electrons

can be drawn as 4 dots or two parallel lines

Question 7

triple bond

Answer 7

shares six electrons

can be drawn as 6 dots or three parallel lines

Question 8

exceptions to the octet rule

Answer 8

H wants only 2 electrons
B can have 6 at most
S and P can have more than 8 (expanded valences)

Question 9

coordinate covalent bond

Answer 9

when an atom attaches itself to another atom’s lone pair

Question 10

VSEPR

Answer 10

Valence Shell Electron Pair Repulsion

tells us the 3D shape of the molecule

Question 11

the shape of a molecule with two attachments to the central atom (ex: CO2)

Answer 11

linear

Question 12

the shape of a molecule with three attachments to the central atom (ex: BF3)

Answer 12

trigonal planar

Question 13

the shape of a molecule with four attachments to the central atom (ex: CH4)

Answer 13

tetrahedral

Question 14

the shape of a molecule with five attachments to the central atom (ex: PF5)

Answer 14

bipyramidal

Question 15

the shape of a molecule with six attachments to the central atom (ex: SF6)

Answer 15

octahedral

Question 16

The five intermolecular forces from weakest to strongest

Answer 16

dispersion force
dipole-dipole force
hydrogen bonding
ion-dipole force
ion-ion force

Question 17

The intermolecular force which allows O2 to dissolve in water

Answer 17

dispersion force.

Polar water molecules cause an induced dipole in O2’s electron cloud.

Question 18

Hydrogen bond

Answer 18

a strong dipole dipole force

only occurs between a slightly positive H and a slightly negative F, O, or N.