Gen Chem Day 7 Flashcards Preview

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Flashcards in Gen Chem Day 7 Deck (42):
0

a function that only depends upon the inital and final states of the system, being independent of the pathway taken

state function

1

change in heat, not state funciton

Q

2

Enthalpy

H

3

exothermic

H<0 releases heat

4

endothermic

H>0 needs heat

5

change H=

qp... pressure of heat

6

Hess's law... ways to calculate H

pick the ones that add up to your goal

7

Bond dissociation energy

Change H= sum D broken- sum D formed

8

Bond breaking is

endothermic

9

Bond making is

exothermic

10

Enthalpies of Formation

change H= sum n H products - sum n H reactants

11

forms 1 mole of a single substance from its component elements in their standard states

formation rxn

12

Calorie

1000 cal

13

Calorimetry

q=CchangeT or q=mcchangeT

14

Entropy (S)

phases of matter S=sum S products - sum S reactants... focus on moles

15

c= specific heat

4.184 J/ g*c

16

Temp does

Not change during phase change

17

G<0

spontaneous

18

G>0

nonspontaneous

19

G=0

at equilbrium

20

Gas in a piston

1. Transfer of heat (lock piston)
2. Expanding gases cool; compressing gases warm (real, not ideal)

21

Isobaric

(change P=0... no change in pressure

22

isochoric

change V = 0 so w=0... no work

23

isothermal

change T =0 so change E=0 NOCHANGE

24

Adiabatic

q=0 anti temp exchange... no temp change

25

Zeroth law

concept of thermal equilibrium and temp

26

1. thermodynamics

energy can be neather created nor destroyed

27

2 thermodynamics

for a spontaneous process, the entropy of the universe increases... system vs surrouding

28

3 thermodynamics

a perfect crystal at 0K has zero entropy

29

change E=

q+w

30

w=

-Pchange V

31

change G=

sum n G products- sum n G reactants

32

change G=

change G degree + RTlnQ

33

change G=

-RTlnKeq

34

change S=

change H/ T

35

change G=

change H- T change S

36

H- S-

sponateous at low temp

37

H+ S+

spontaneous at high tem

38

H- S+

always sponteous

39

H+ S-

non spontaneous at all temps

40

Expansion

v>0, w<0

41

compression

v0