Midterm

Question 1

work done at a constant pressure is

Answer 1

irreversible

Question 2

____________. is used when finding the heat of a calorimeter

Answer 2

heat capacity not specific heat capacity because mass is not taken into account

Question 3

_________________ the transition of a substance directly from a solid to a gas without passing through the liquid phase

Answer 3

sublimation

Question 4

Delta H sublimation

Answer 4

Delta H vaporization + Delta H fusion

Question 5

Formula for irreversible expansion

Answer 5

-P ext * Delta V system

Question 6

formula for reversible expansion

Answer 6

-nrt lnv2/v1

Question 7

State functions

Answer 7

PD TV HUGS

Question 8

the mixing of reactions to calculate delta H is called

Answer 8

Hess’s law

Question 9

what formula do you use to calculate residual entropy?

Answer 9

the one with Kb

Question 10

trends for higher molar entropy

Answer 10

• more massive/complex
• gas>liquid> solid
• gas with less pressure
• less rigid structure

Question 11

spontaneous reactions have

Answer 11

negative delta G’s

Question 12

non spontaneous reactions have

Answer 12

positive delta G’s

Question 13

In a reversible process delta delta S surroundings is

Answer 13

equal to 0

Question 14

Delta S reaction

Answer 14

Delta S surroundings + Delta S system

Question 15

____________- when the forward. and reverse rates are equal {R] and [P] constant

Answer 15

Equilibrium

Question 16

what states are included and what are not in an equilibrium constant

Answer 16

(aq) and (g) included

(s) and (l) no included

Question 17

in increasing the pressure you are

Answer 17

decreasing the volume

Question 18

if the system is compressed it will move toward

Answer 18

the side with more moles

Question 19

change in internal energy is zero when

Answer 19

temperature does not change

Question 20

closed system

Answer 20

matter can not be exchange but energy can be

Question 21

isolated system

Answer 21

neither matter nor energy can be exchanged

Question 22

W in residual entropy

Answer 22

(micro states) ^(particles)

Question 23

Delta S surroundings is equal to zero when

Answer 23

the system isolated m is

Question 24

Delta S total is equal to zero when

Answer 24

the reaction is reversible

Question 25

Delta U is 0 if

Answer 25

isothermal expansion

Question 26

_______________ is the increase in volume under constant-temperature conditions. In this situation, the gas does work, so the work is negatively-signed because the gas exerts energy to increase in volume

Answer 26

isothermal expansion

Question 27

_______________

A change that occurs at constant temperature.

Answer 27

isothermal change

Question 28

when the reaction is reversible what is the entropy value

Answer 28

delta s =0

Question 29

when the reaction is irreversible what is the entropy value

Answer 29

delta s>0