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USC / Chemistry / CHEM 111 / What is Exothermic?

# What is Exothermic? Description

##### Description: Study guide for second midterm exam
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## What is Exothermic?

Chapter 5

Study

Guide

KE=/amra

Total Energy always remains constant

Law of Conservation of Energy

Exothermic - releases heat, heat on right side of equation

E.: CH4 + 20

CO2 + 2H2O

CH= -890 kJ

Endothermic

absords heat, heat on left side of equation

Ex: N2 + O2 + 2NO 4H+ 181.8 kJ

AH - Change in enthalpy - change in heat

Specific Heat - heat needed to increse T

res

of lg by IK

sue

q=MCAT

H2O

= 4.184

Slg.K

@ I atm pressure

Standard State - specified temp

Standard Enthalpy is AHFO

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Chapter 6. Study

Guide

I atm = 760 torr = 101.3 kPa = 760 mm Hg = 1.013 bar

= 133,3 Pa = 29.9 in Hg:14.7 psi

Boyle's Law - VP = V2 P2

P.V.

Pa V2

Charles Law - y

## What is Endothermic?

FT

T

= V2

n,

na

Ideal Gas Law - PV=nRT

R=0.08206

1 mol @ STP is 22.4 L

(1 atm) (22.4L) = ('moln (.08206) (273 k) P, = P & P + P..... Partial Pressure o n mole fraction

Pp = n, x Pr

от

Average Speed of a

R: 8.314

Gas- rms=3RT

1 molar mass

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Effusion - passage of gas through small hole Diffusion - mixing of particles due to motion

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Chapter 6 Study Guide (Continued) rate of effusion A

ЛВ.

B

van der Waals

Equation -

+ ana

(vand): ARI

12

For

deviations

from ideal behavior

Studysa

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Chapter 7

Study

Guide

Wavelength - x - distance

## What is Specific Heat?

We also discuss several other topics like common aseptic transfers and inoculation methods

from

one peak to the next

Frequency-v-number of waves

each second

that pass a

fixed

line

Speed of

Light - c- 3 e 8

m/s

c=tr.

E = hy

where

h = 6.6266-34.

Rydberg Equation. I =RA ( R: 1.09767 Bohr Model. En: 27 me" ( 1 ) BB: -2.188-11

d = h -b - P mr

p=mv

po momentum v=velocity

Quantum

Numbers - no distance

le shape of Me - orientation

from nucleus shell

of shells

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n- any wont positive integer, indicates which shell e o

2 3 4 5 S P d f g h me - all whole numbers ranging from e to e Mg-electron spin + 1/2

Chapter 7 Study Guide (continued)

Possible Combinations. ne me

#

orbitals

100

01-10

sololiloli

10,1

- O it! -2,-1,0 ,

1, + 2

0

-1,

- 2 1-3

0 1 -2

+ 1 ,0 ,

-1

1, 0

2 +1, +2

+3

Ex 2p, n:2 2:1, me = -1 or 0 or + 3 orbitals

Electron Spin Quantum Number - 1/2

Electron Configuration - lists occupied subshells Es Lia 15° 25' 17

13

23.

B4 15*2,2 2p! [10] [11] [TTI

IS 25

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Chapter 8 * Use Periodic

Study to

Guide Find Order

of Don't forget about the age old question of chem 12 notes
We also discuss several other topics like Fewer marriages---why?
Don't forget about the age old question of pegboard bookkeeping system
Don't forget about the age old question of chchal

Subshells &

Ils

-

1s

25 35 46

3P up

3d

55

4d 5d

6P

65 175

60

46

Start Top Left, Work Across, Then Down Is + 25 2p 3s 3p 45 3d 4p 55 4d5p+65 4f 50 60 75 + 5f 6d

Use the Noble Gas as Prefixes Ex Sc = [Ar]45230

Valence Electrons & Highest Principle Quantum # Anions and Cations fill or empty valence orbitals Size Trends & same e less protons = larger We also discuss several other topics like ids 355 uic

same pt less electrons smaller

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