Unit 3

Question 1

Intermolecular Forces (IMF)

Answer 1

attractions BETWEEN atoms, ions or molecules that hold them together (weak)

Question 2

Van Der Waal’s Forces

Answer 2

London dispersion forces and dipole-dipole forces

Question 3

Intramolecular Forces

Answer 3

forces WITHIN the molecule (strong)

Question 4

London Dispersion Forces (LDFs)

Answer 4

are present in all substances and are the only type of IMF present in nonpolar molecules

Question 5

Temporary Dipole

Answer 5

there is an unequal distribution of electrons and therefore there is an excess of negative charge in one place and an area that is more positive

Question 6

Induced Dipole

Answer 6

the temporary dipole causes the neighboring atoms/molecules to change, causing the negative end to repel e⁻ and the positive end to attract e⁻; present between a polar and nonpolar molecule

Question 7

Polarizability

Answer 7

the ability of an atom to form a temporary or induced dipole

Question 8

Polarized

Answer 8

the separation of positive and negative charges in an nucleus, atom, or molecule

Question 9

Dipole-dipole interactions

Answer 9

present between polar molecules

Question 10

Ion-dipole forces

Answer 10

present between ions and polar molecules; tends to be stronger than dipole-dipole forces

Question 11

Hydrogen Bonding

Answer 11

strong type of intermolecular INTERACTION that exists in molecules that contain H-N, H-O, or H-F bonds

Question 12

Ionic interactions

Answer 12

occurs between metal and nonmetal atoms when they lose or gain electrons to form ions

Question 13

Metallic bonding

Answer 13

occurs between metal atoms (can be just one type of metal, a pure substance, or for different types of metal, a mixture called an alloy)

Question 14

Alloy

Answer 14

metallic substance composed of 2 or more elements

Question 15

Pi bonding

Answer 15

the presence of double or triple bonds

Question 16

Covalent Network

Answer 16

occurs between carbon atoms, silicon atoms, and carbon with oxygen or silicon, and silicon with oxygen

Question 17

Spectroscopy

Answer 17

the study of how matter interacts with electromagnetic radiation

Question 18

Translational Movement

Answer 18

movement from one place to another

Question 19

Rotational Movement

Answer 19

spinning in one place

Question 20

Vibrational Movement

Answer 20

moving in place (bending, symmetric stretching, asymmetric stretching)

Question 21

Photoelectric Effect

Answer 21

when light shines on the surface of a metal, electrons can be ejected from the surface

Question 22

Binding Energy

Answer 22

how tightly the electrons are being held in the atom; the energy needed to remove the electron

Question 23

Photoelectric Current

Answer 23

the rate of emission of the photoelectrons

Question 24

Absorbance

Answer 24

the measure of the light that is stopped by or absorbed by the solution

Question 25

Aqueous Solution

Answer 25

a solution with water as the solvent

Question 26

Concentration

Answer 26

a measure of the amount of particles that are distributed in a solution; how densely packed the particles are