CHEMISTRY COMMUNITY - Chem 14B

Chem 14B

Chemical Equilibrium

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Ideal Gases
$PV=nRT$
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Topics: 254

254 Topics

1374 Posts

Last post Re: Reading the textbook
by Alan Cornejo 1a View the latest post
Sun Oct 20, 2019 10:59 pm
Equilibrium Constants & Calculating Concentrations
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Topics: 1788

1788 Topics

5479 Posts

Last post Re: Effect of increased conce…
by 904837647 View the latest post
Sun Mar 17, 2019 7:15 pm
Non-Equilibrium Conditions & The Reaction Quotient
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Topics: 265

265 Topics

1055 Posts

Last post Re: What is pKa and Ka exactl…
by 904837647 View the latest post
Sun Mar 17, 2019 6:21 pm
Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
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Topics: 436

436 Topics

1600 Posts

Last post Re: Le Chatlier Principle
by 505211599 View the latest post
Sun Mar 17, 2019 11:57 pm

Thermochemistry

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Phase Changes & Related Calculations
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Topics: 975

975 Topics

3652 Posts

Last post Re: heating curves
by Giselle1B View the latest post
Sun Mar 17, 2019 10:37 pm
Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
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Topics: 1861

1861 Topics

5483 Posts

Last post Re: 4D.9) 7th edition
by Ziyan Wang 3J View the latest post
Thu Oct 10, 2019 12:09 pm
Heat Capacities, Calorimeters & Calorimetry Calculations
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Topics: 1012

1012 Topics

3100 Posts

Last post Re: bomb calorimeter
by Luis_Yepez_1F View the latest post
Sun Mar 17, 2019 9:20 pm

Thermodynamics

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Thermodynamic Systems (Open, Closed, Isolated)
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Topics: 439

439 Topics

1796 Posts

Last post Re: Adiabatic and isothermal
by Jacqueline Duong 1H View the latest post
Sun Mar 17, 2019 4:47 am
Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
isochoric/isometric: $\Delta V = 0$
isothermal: $\Delta T = 0$
isobaric: $\Delta P = 0$
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Topics: 354

354 Topics

1197 Posts

Last post Re: Bomb Calorimeter
by Diviya Khullar 1G View the latest post
Sun Mar 17, 2019 10:38 pm
Calculating Work of Expansion
$w=-P\Delta V$
and
$w=-\int_{V_{1}}^{V_{2}}PdV=-nRTln\frac{V_{2}}{V_{1}}$
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Topics: 655

655 Topics

2091 Posts

Last post Re: Work
by Rosha Mamita 2H View the latest post
Mon Mar 18, 2019 10:32 pm
Concepts & Calculations Using First Law of Thermodynamics
$\Delta U=q+w$
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Topics: 832

832 Topics

2450 Posts

Last post Re: Work done vs work on syst…
by Helen Mejia 1I View the latest post
Sun Mar 17, 2019 10:15 pm
Concepts & Calculations Using Second Law of Thermodynamics
$\Delta S = \frac{q_{rev}}{T}$
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Topics: 799

799 Topics

2279 Posts

Last post Re: delta h and q
by Chris Dis3L View the latest post
Sun Mar 17, 2019 11:21 pm
Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Boltzmann Equation for Entropy: $S = k_{B} \ln W$
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Topics: 348

348 Topics

977 Posts

Last post Re: n in degeneracy
by Jacqueline Duong 1H View the latest post
Sun Mar 17, 2019 10:01 am
Entropy Changes Due to Changes in Volume and Temperature
Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$
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Topics: 729

729 Topics

2106 Posts

Last post Re: Hotdog #5
by Simmi Diwanji 2B View the latest post
Mon Mar 18, 2019 12:39 pm
Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
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Topics: 271

271 Topics

843 Posts

Last post Re: molar mass
by Chem_Mod View the latest post
Sun Mar 17, 2019 12:49 am
Gibbs Free Energy Concepts and Calculations
$\Delta G^{\circ}= \Delta H^{\circ} - T \Delta S^{\circ}$

$\Delta G^{\circ}= -RT\ln K$

$\Delta G^{\circ}= \sum \Delta G_{f}^{\circ}(products) - \sum \Delta G_{f}^{\circ}(reactants)$
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Topics: 1036

1036 Topics

3129 Posts

Last post Re: ∆G and work
by Jacqueline Duong 1H View the latest post
Sun Mar 17, 2019 5:35 am
Van't Hoff Equation
$\ln K = -\frac{\Delta H^{\circ}}{RT} + \frac{\Delta S^{\circ}}{R}$
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Topics: 90

90 Topics

369 Posts

Last post Re: Derivation
by Te Jung Yang 4K View the latest post
Sun Mar 17, 2019 9:25 pm
Environment, Fossil Fuels, Alternative Fuels
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Topics: 12

12 Topics

39 Posts

Last post Re: Why energy crisis?
by Rehan Chinoy 1K View the latest post
Mon Feb 25, 2019 2:20 pm
Biological Examples (*DNA Structural Transitions, etc.)
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Topics: 12

12 Topics

37 Posts

Last post Re: Hemoglobin and Equilibrium
by Roberto Gonzalez 1L View the latest post
Sun Mar 17, 2019 5:58 pm

Electrochemistry

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Balancing Redox Reactions
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Topics: 1004

1004 Topics

3384 Posts

Last post Re: Triprotic
by Chem_Admin View the latest post
Mon Mar 18, 2019 10:45 am
Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
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Topics: 1938

1938 Topics

5417 Posts

Last post Re: Cell Potentials
by Chem_Mod View the latest post
Mon Mar 18, 2019 12:35 am
Work, Gibbs Free Energy, Cell (Redox) Potentials
$\Delta G^{\circ} = -nFE_{cell}^{\circ}$
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Topics: 454

454 Topics

1554 Posts

Last post Re: Wmax
by Sydney Tay 2B View the latest post
Sun Mar 17, 2019 4:48 pm
Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
$E_{cell} = E_{cell}^{\circ}-\frac{RT}{nF}\ln Q$
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Topics: 684

684 Topics

1942 Posts

Last post Re: Vant Hoff equation on for…
by Bryant Vong 2G View the latest post
Sun Mar 17, 2019 9:36 pm
Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Moderators: Chem_Mod, Chem_Admin
Topics: 93

93 Topics

243 Posts

Last post Re: Electrolysis
by Cade Okohira 4K View the latest post
Sun Mar 17, 2019 7:27 pm

Chemical Kinetics

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Kinetics vs. Thermodynamics Controlling a Reaction
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Topics: 278

278 Topics

1063 Posts

Last post Re: Study Advice
by Claire Grover 3G View the latest post
Thu Oct 03, 2019 9:52 pm
General Rate Laws
$aR \to bP, Rate = -\frac{1}{a} \frac{d[R]}{dt} = \frac{1}{b}\frac{d[P]}{dt}$
Moderators: Chem_Mod, Chem_Admin
Topics: 842

842 Topics

2664 Posts

Last post Re: Unique Reaction Rates
by NicoJones_1B View the latest post
Sun Oct 13, 2019 11:20 am
Method of Initial Rates (To Determine n and k)
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Topics: 319

319 Topics

1038 Posts

Last post Re: Week 9 Worksheet (2E,I,K)
by Maayan Epstein 14B View the latest post
Sun Mar 17, 2019 10:15 pm
Zero Order Reactions
$\frac{d[R]}{dt}=-k; [R]=-kt + [R]_{0}; t_{\frac{1}{2}}=\frac{[R]_{0}}{2k}$
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Topics: 167

167 Topics

715 Posts

Last post Re: Deriving Equations
by SydBenedict2H View the latest post
Sun Mar 17, 2019 10:49 pm
First Order Reactions
$\frac{d[R]}{dt}=-k[R]; \ln [R]=-kt + \ln [R]_{0}; t_{\frac{1}{2}}=\frac{0.693}{k}$
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Topics: 381

381 Topics

1297 Posts

Last post Re: Slopes of a plot
by Douglas Nguyen 2J View the latest post
Sun Mar 17, 2019 10:58 pm
Second Order Reactions
$\frac{d[R]}{dt}=-k[R]^{2}; \frac{1}{[R]}=kt + \frac{1}{[R]_{0}}; t_{\frac{1}{2}}=\frac{1}{k[R]_{0}}$
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Topics: 221

221 Topics

746 Posts

Last post Re: Half Life
by Anmol_cheema_2F View the latest post
Sun Mar 17, 2019 5:17 pm
Reaction Mechanisms, Reaction Profiles
$K = \frac{k_{forward}}{k_{reverse}}$
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Topics: 746

746 Topics

2229 Posts

Last post Re: HW problem
by aaronharouni View the latest post
Mon Mar 18, 2019 12:23 pm
Arrhenius Equation, Activation Energies, Catalysts
Arrhenius Equation: $\ln k = - \frac{E_{a}}{RT} + \ln A$
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Topics: 609

609 Topics

1805 Posts

Last post Re: Enzyme
by Rosha Mamita 2H View the latest post
Mon Mar 18, 2019 10:35 pm
*Enzyme Kinetics
$V_{0} = \frac{V_{max}[S]}{K_{M} + [S]}; K_{M} = \frac{[E][S]}{[ES]}$
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Topics: 55

55 Topics

223 Posts

Last post Re: How do you tell if someth…
by 505211599 View the latest post
Sun Mar 17, 2019 11:58 pm
Experimental Details
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Topics: 31

31 Topics

105 Posts

Last post Re: Psuedo First Order
by Douglas Nguyen 2J View the latest post
Sun Mar 17, 2019 11:01 pm
Environment, Ozone, CFCs
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Topics: 4

4 Topics

10 Posts

Last post Re: Homogeneous Catalysts and…
by Angel Chen 2k View the latest post
Fri Mar 15, 2019 4:51 pm
Biological Examples
Moderators: Chem_Mod, Chem_Admin
Topics: 12

12 Topics

38 Posts

Last post Re: ATP example
by MariahClark 2F View the latest post
Sun Mar 17, 2019 7:28 pm

*Thermodynamics and Kinetics of Organic Reactions

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*Electrophiles
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Topics: 135

135 Topics

401 Posts

Last post Re: final
by Rogelio Bazan 1D View the latest post
Mon Mar 11, 2019 3:30 pm
*Nucleophiles
Moderators: Chem_Mod, Chem_Admin
Topics: 135

135 Topics

371 Posts

Last post Re: SN2 Reactions
by 604807557 View the latest post
Sun Mar 18, 2018 10:33 pm
*Organic Reaction Mechanisms in General
Moderators: Chem_Mod, Chem_Admin
Topics: 297

297 Topics

725 Posts

Last post Re: Functional Groups
by Henry Dudley 1G View the latest post
Sat Mar 16, 2019 8:24 pm
*Electrophilic Addition
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Topics: 102

102 Topics

251 Posts

Last post Re: nucleophile and electroph…
by Hadji Yono-Cruz 2L View the latest post
Sat Mar 16, 2019 6:58 pm
*Nucleophilic Substitution
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Topics: 38

38 Topics

103 Posts

Last post Re: Transition States
by melissa carey 1f View the latest post
Sat Mar 17, 2018 11:39 am
*Free Energy of Activation vs Activation Energy
Moderators: Chem_Mod, Chem_Admin
Topics: 131

131 Topics

312 Posts

Last post Re: Spontaneous reactions
by Roberto Gonzalez 1L View the latest post
Sun Mar 17, 2019 6:06 pm
*Complex Reaction Coordinate Diagrams
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Topics: 23

23 Topics

58 Posts

Last post Re: Unique Rate.
by Jacob Cho 2L View the latest post
Wed Mar 07, 2018 3:03 am

*Names and Structures of Organic Molecules

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*Alkanes
Moderators: Chem_Mod, Chem_Admin
Topics: 585

585 Topics

1656 Posts

Last post Re: Final
by 804994652 View the latest post
Sun Mar 17, 2019 9:25 am
*Cycloalkanes
Moderators: Chem_Mod, Chem_Admin
Topics: 216

216 Topics

575 Posts

Last post Re: SN2
by Chem_Mod View the latest post
Sun Mar 18, 2018 9:34 pm
*Alkenes
Moderators: Chem_Mod, Chem_Admin
Topics: 211

211 Topics

540 Posts

Last post Re: Cis/ Trans
by divya_devineni_2E View the latest post
Sun Mar 19, 2017 10:18 pm
*Cycloalkenes
Moderators: Chem_Mod, Chem_Admin
Topics: 150

150 Topics

410 Posts

Last post Re: Where to start counting W…
by 104469125 View the latest post
Sun Mar 19, 2017 6:43 am
*Alkynes
Moderators: Chem_Mod, Chem_Admin
Topics: 42

42 Topics

108 Posts

Last post Re: Alkyne Naming
by Jeannie_Kim_1I View the latest post
Sat Mar 11, 2017 1:08 pm
*Constitutional and Geometric Isomers (cis, Z and trans, E)
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Topics: 217

217 Topics

586 Posts

Last post Re: Determining cis, z, trans…
by Vincent Tse 2B View the latest post
Mon Mar 20, 2017 12:54 am
*Haloalkanes
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Topics: 27

27 Topics

73 Posts

Last post Re: Transition states and mec…
by feodora_r_3d View the latest post
Sat Mar 18, 2017 11:19 pm
*Haloalkenes
Moderators: Chem_Mod, Chem_Admin
Topics: 18

18 Topics

44 Posts

Last post Re: Green Book Chapter 2 Ques…
by William_Lee_Dis_3H View the latest post
Fri Mar 17, 2017 2:14 am
*Alcohols
Moderators: Chem_Mod, Chem_Admin
Topics: 108

108 Topics

260 Posts

Last post Re: study tips
by Yang Chen 2E View the latest post
Sat Mar 17, 2018 8:50 pm
*Ethers
Moderators: Chem_Mod, Chem_Admin
Topics: 61

61 Topics

158 Posts

Last post Re: Nucleophile
by 804899546 View the latest post
Thu Mar 15, 2018 9:44 pm
*Aldehydes
Moderators: Chem_Mod, Chem_Admin
Topics: 27

27 Topics

63 Posts

Last post Re: Carbonyl -> Aldehydes and…
by Jessica_Singh_1J View the latest post
Fri Mar 16, 2018 8:15 pm
*Ketones
Moderators: Chem_Mod, Chem_Admin
Topics: 37

37 Topics

88 Posts

Last post Re: Keytone and Aldeyhdes
by AtreyiMitra2L View the latest post
Sat Mar 17, 2018 10:46 pm
*Carboxylic Acids
Moderators: Chem_Mod, Chem_Admin
Topics: 20

20 Topics

45 Posts

Last post Re: Functional Groups
by Phillip Tran View the latest post
Sun Mar 18, 2018 5:02 pm
*Amines
Moderators: Chem_Mod, Chem_Admin
Topics: 49

49 Topics

120 Posts

Last post Re: Conditions for being an A…
by John Huang 1G View the latest post
Sat Mar 17, 2018 1:36 pm
*Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
Moderators: Chem_Mod, Chem_Admin
Topics: 62

62 Topics

145 Posts

Last post Re: Triprotic Acid
by Chem_Mod View the latest post
Sun Mar 17, 2019 3:10 pm

*Conformations of Organic Molecules

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Posts

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*Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Moderators: Chem_Mod, Chem_Admin
Topics: 233

233 Topics

598 Posts

Last post Re: nucleophiles
by Jaewoo Jo 2L View the latest post
Sun Mar 18, 2018 10:54 pm
*Cyclopropanes and Cyclobutanes
Moderators: Chem_Mod, Chem_Admin
Topics: 39

39 Topics

99 Posts

Last post Re: Torsional Strain
by William Shu 1G View the latest post
Sun Mar 19, 2017 1:34 pm
*Cyclopentanes
Moderators: Chem_Mod, Chem_Admin
Topics: 14

14 Topics

40 Posts

Last post Re: Envelope Conformation
by Chem_Mod View the latest post
Sun Mar 19, 2017 12:11 am
*Cyclohexanes (Chair, Boat, Geometric Isomers)
Moderators: Chem_Mod, Chem_Admin
Topics: 193

193 Topics

479 Posts

Last post Re: Most stable confirmation?
by Hyun Young Lee 2H View the latest post
Mon Mar 20, 2017 5:28 pm
*Calculations Using ΔG° = -RT ln K
Moderators: Chem_Mod, Chem_Admin
Topics: 25

25 Topics

66 Posts

Last post Re: Vocabulary
by Jaewoo Jo 2L View the latest post
Sun Mar 18, 2018 10:58 pm
*ChemDraw
Moderators: Chem_Mod, Chem_Admin
Topics: 17

17 Topics

43 Posts

Last post Re: draw
by Mishta Stanislaus 1H View the latest post
Sun Mar 18, 2018 9:21 pm
*Chem3D
Moderators: Chem_Mod, Chem_Admin
Topics: 25

25 Topics

70 Posts

Last post Re: The meaning of "dihedral"
by lisabang2L View the latest post
Sat Mar 18, 2017 11:56 pm

Forum

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Posts

Last post

Student Social/Study Group
This forum topic is for students to self-organize study groups, etc.
Moderators: Chem_Mod, Chem_Admin
Topics: 138

138 Topics

838 Posts

Last post Re: Final Jitters
by Elizabeth Harty 3A View the latest post
Sun Oct 20, 2019 8:49 pm
Administrative Questions and Class Announcements
General non-science questions and class announcements.
Moderators: Chem_Mod, Chem_Admin
Topics: 512

512 Topics

3244 Posts

Last post Re: Saying Thank You to Dr. L…
by Jaklin Astvatsatryan View the latest post
Sun Oct 20, 2019 11:53 pm
General Science Questions
Science questions not covered in Chem 14A and 14B. Try to limit questions to chemistry (inorganic chemistry, physical chemistry, organic chemistry, biophysical chemistry, biochemistry, materials science, environmental chemistry).
Moderators: Chem_Mod, Chem_Admin
Topics: 141

141 Topics

442 Posts

Last post Re: Quick clarification
by 305385703 View the latest post
Mon Oct 21, 2019 9:18 am

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