Exam 3

Question 1

Where can peptide bonds rotate

Answer 1

N-aC

Question 2

N-C(carbonyl) angle

Answer 2

Omega

Question 3

C(Carbonyl)-aC angle

Answer 3

Psi

Question 4

aC-N angle

Answer 4

Phi

Question 5

The amino acid sequence

Answer 5

Primary structure

Question 6

Local folded structure. Stabilized H-bonds between backbone amides

Answer 6

Secondary structure

Question 7

Interactions between regions of secondary structure. Stabilized by the hydrophobic effect and intermolecular interactions between side chains.

Answer 7

Tertiary structure

Question 8

Interactions between multiple folded polypeptide chains.

Answer 8

Quaternary structure

Question 9

Molecules move in straight lines; their directions is random

Answer 9

KMT or gases(kinetic molecular theory)

Question 10

Molecules are small. The volume of the molecule is much smaller than the volume of the container.

Answer 10

KMT of gases

Question 11

Molecules do not attract or repel each other.

Answer 11

KMT of gases

Question 12

Molecules experience elastic collisions

Answer 12

KMT of gases

Question 13

The mean kinetic energy is proportional to the temperature in kelvin

Answer 13

KMT of gases

Question 14

T is proportional to E =

Answer 14

1/2 mxu^2 (mass of molecule in kg) (root mean square speed of molecule)

Question 15

U(rms)=

Answer 15

Square root of 3RT/M R=8.314 M=Molar mass T=temperature in kelvin

Question 16

Leakage of gas through a small opening

Answer 16

Effusion

Question 17

Diffusion

Answer 17

Even distribution of all gases throughout a volume of space

Question 18

Light molecules effuse and diffuse faster than heavy molecules

Answer 18

True

Question 19

Square root M2/M1 M=molar mass

Answer 19

Grahams law(measuring effusion of two gases)

Question 20

1 atm =

Answer 20

760 torr

Question 21

Standard temperature and pressure values

Answer 21

T=0 C P= 1atm

Question 22

density =

Answer 22

nM/V and PM/RT

Question 23

Moles are proportional to volume

Answer 23

True

Question 24

The pressure a gas would exert if alone in a container

Answer 24

Partial pressure

Question 25

Fraction of each gas in both terms of pressure and of moles
X=Pi/Pt=ni/nt

Answer 25

Mole fraction

Question 26

Pi=XiPt

Answer 26

True

Question 27

Energy is required to disrupt molecular interactions (vaporization, fusion, sublimation)

Answer 27

Endothermic

Question 28

Energy is released, when intermolecular interactions are formed (condensation, freezing, sublimation)

Answer 28

Exothermic

Question 29

Heat capacity per gram
q/m(change in T) q=heat transferred

Answer 29

Specific heat capacity

Question 30

Heat capacity per mole
q/n(change in T)

Answer 30

Molar heat capacity

Question 31

Vapor pressure increases with temperature

Answer 31

True

Question 32

Strong IMFs mean high boiling point and low vapor pressure

Answer 32

True

Question 33

A minor component in a solution

Answer 33

Solute

Question 34

A major component in a solution

Answer 34

Solvent

Question 35

Mass of solute/mass of solution

Answer 35

Mass fraction

Question 36

Mass fraction x 100%

Answer 36

Mass %

Question 37

Moles of solute/moles of solution

Answer 37

Mole fraction

Question 38

Moles of solute/liters or solution

Answer 38

Molarity

Question 39

A solution that contains less solute than is soluble under those conditions

Answer 39

Unsaturated

Question 40

A solution that contains the maximum amount of solute that is soluble under those conditions

Answer 40

Saturated

Question 41

A solutions that contains more than the maximum amount of solute that is soluble under those conditions

Answer 41

Supersaturated

Question 42

Soluble in all proportions

Answer 42

Miscible

Question 43

Gas solubility decreases at temperature increases

Answer 43

True

Question 44

Cg=kPg Cg=amount of gas dissolved Pg=partial pressure of gas above the solution

Answer 44

Henry’s law