CHEMISTRY COMMUNITY - Chem 14B

Chem 14B

Chemical Equilibrium

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Ideal Gases
$PV=nRT$
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523 Topics

4580 Posts

Last post Re: Chem BL
by Ismar Zamora View the latest post
Tue Mar 02, 2021 6:06 pm
Equilibrium Constants & Calculating Concentrations
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4055 Topics

16515 Posts

Last post Re: Cut off for K to ignore x
by Kailani_Dial_2K View the latest post
Tue Mar 02, 2021 3:27 pm
Non-Equilibrium Conditions & The Reaction Quotient
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Topics: 617

617 Topics

3782 Posts

Last post Re: Textbook 5G.11, Q vs K
by Astha Patel 2J View the latest post
Sun Feb 28, 2021 7:43 pm
Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
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1001 Topics

5327 Posts

Last post Re: Explaining Le Chatelier's…
by jadensteplight_2F View the latest post
Thu Feb 25, 2021 4:53 pm

Thermochemistry

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Phase Changes & Related Calculations
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1403 Topics

6791 Posts

Last post Re: Endothermic v. Exothermic
by Rose_Malki_3G View the latest post
Sun Feb 28, 2021 11:47 pm
Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
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Topics: 2633

2633 Topics

8977 Posts

Last post Re: DeltaH to q
by David Y View the latest post
Sun Feb 28, 2021 11:43 pm
Heat Capacities, Calorimeters & Calorimetry Calculations
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Topics: 1654

1654 Topics

6027 Posts

Last post Re: Isolated System
by Susan Chamling 1F View the latest post
Mon Mar 01, 2021 1:39 am

Thermodynamics

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Thermodynamic Systems (Open, Closed, Isolated)
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726 Topics

4071 Posts

Last post Re: Isolated Systems
by 605291562 View the latest post
Sun Feb 28, 2021 11:22 pm
Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
isochoric/isometric: $\Delta V = 0$
isothermal: $\Delta T = 0$
isobaric: $\Delta P = 0$
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Topics: 544

544 Topics

2364 Posts

Last post Re: isobaric
by Jeremy Wei 2C View the latest post
Mon Mar 01, 2021 6:24 am
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: 1092

1092 Topics

4282 Posts

Last post Re: Calculating Moles
by Jacquelyn Challis 2B View the latest post
Tue Mar 02, 2021 6:08 pm
Concepts & Calculations Using First Law of Thermodynamics
$\Delta U=q+w$
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Topics: 1255

1255 Topics

4577 Posts

Last post Re: H vs q
by Sam Wentzel 1F 14B View the latest post
Sun Feb 28, 2021 11:37 pm
Concepts & Calculations Using Second Law of Thermodynamics
$\Delta S = \frac{q_{rev}}{T}$
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Topics: 1178

1178 Topics

3868 Posts

Last post Re: entropy positive value
by Gian Boco 2G View the latest post
Sun Feb 28, 2021 8:43 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: 520

520 Topics

1636 Posts

Last post Re: avogadro's number in Bolt…
by Rohit Srinivas 2D View the latest post
Sun Feb 28, 2021 11:11 pm
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: 1078

1078 Topics

3590 Posts

Last post Re: Different Gas Constants
by Gian Boco 2G View the latest post
Sun Feb 28, 2021 8:44 pm
Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
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Topics: 391

391 Topics

1444 Posts

Last post Re: Molar Entropy
by Diana Aguilar 3H View the latest post
Sun Feb 28, 2021 11:20 pm
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: 1480

1480 Topics

5468 Posts

Last post Re: G° vs G
by Susan Chamling 1F View the latest post
Mon Mar 01, 2021 1:40 am
Van't Hoff Equation
$\ln K = -\frac{\Delta H^{\circ}}{RT} + \frac{\Delta S^{\circ}}{R}$
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Topics: 195

195 Topics

1004 Posts

Last post Re: Van't Hoff equation
by Gian Boco 2G View the latest post
Sun Feb 28, 2021 8:47 pm
Environment, Fossil Fuels, Alternative Fuels
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Topics: 16

16 Topics

72 Posts

Last post Re: Energy Density
by magalysantos_1F View the latest post
Tue Mar 02, 2021 3:32 pm
Biological Examples (*DNA Structural Transitions, etc.)
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Topics: 16

16 Topics

68 Posts

Last post Re: STP
by Susan Chamling 1F View the latest post
Mon Feb 22, 2021 8:18 pm

Electrochemistry

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Balancing Redox Reactions
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Topics: 1801

1801 Topics

7805 Posts

Last post Re: 6k.3 d) Identifying Half …
by Aliya 1H View the latest post
Tue Mar 02, 2021 10:03 pm
Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
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Topics: 2968

2968 Topics

9744 Posts

Last post Re: Textbook 6N.3
by KatarinaReid_3H View the latest post
Tue Mar 02, 2021 10:21 pm
Work, Gibbs Free Energy, Cell (Redox) Potentials
$\Delta G^{\circ} = -nFE_{cell}^{\circ}$
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Topics: 728

728 Topics

3137 Posts

Last post Re: Textbook 6M7
by Mary Shih 3J View the latest post
Tue Mar 02, 2021 10:00 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: 1087

1087 Topics

3623 Posts

Last post Re: Effect of concentration
by Mary Shih 3J View the latest post
Tue Mar 02, 2021 9:56 pm
Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
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Topics: 170

170 Topics

534 Posts

Last post Re: RTGs
by Chem_Mod View the latest post
Mon Mar 01, 2021 10:10 pm

Chemical Kinetics

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Kinetics vs. Thermodynamics Controlling a Reaction
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Topics: 342

342 Topics

1592 Posts

Last post Re: Activation Energy
by Serena Song 1A View the latest post
Tue Mar 02, 2021 9:46 pm
General Rate Laws
$aR \to bP, Rate = -\frac{1}{a} \frac{d[R]}{dt} = \frac{1}{b}\frac{d[P]}{dt}$
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Topics: 1051

1051 Topics

3612 Posts

Last post Re: First order reactions
by Serena Song 1A View the latest post
Tue Mar 02, 2021 9:28 pm
Method of Initial Rates (To Determine n and k)
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Topics: 401

401 Topics

1473 Posts

Last post Re: Determining Time with Pha…
by Sid Panda 3A View the latest post
Tue Mar 02, 2021 8:16 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: 216

216 Topics

1006 Posts

Last post Re: Half life
by Serena Song 1A View the latest post
Tue Mar 02, 2021 9:21 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: 467

467 Topics

1690 Posts

Last post Re: order reactions steps
by Sid Panda 3A View the latest post
Tue Mar 02, 2021 8:19 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: 249

249 Topics

933 Posts

Last post Re: 2nd order Half Life
by Chem_Mod View the latest post
Mon Feb 22, 2021 4:01 pm
Reaction Mechanisms, Reaction Profiles
$K = \frac{k_{forward}}{k_{reverse}}$
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Topics: 916

916 Topics

2862 Posts

Last post Re: Molecularity
by Chem_Mod View the latest post
Mon Feb 22, 2021 4:06 pm
Arrhenius Equation, Activation Energies, Catalysts
Arrhenius Equation: $\ln k = - \frac{E_{a}}{RT} + \ln A$
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Topics: 776

776 Topics

2534 Posts

Last post Re: Arrhenius Equation
by DLee_1L View the latest post
Wed Mar 18, 2020 12:22 am
*Enzyme Kinetics
$V_{0} = \frac{V_{max}[S]}{K_{M} + [S]}; K_{M} = \frac{[E][S]}{[ES]}$
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Topics: 69

69 Topics

308 Posts

Last post Re: catalyst
by Madison Wong 3H View the latest post
Tue Feb 23, 2021 2:51 pm
Experimental Details
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Topics: 34

34 Topics

136 Posts

Last post Re: Psuedo First Order
by Noe BM 1J View the latest post
Sun Mar 15, 2020 4:42 pm
Environment, Ozone, CFCs
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Topics: 8

8 Topics

33 Posts

Last post Re: final thoughts
by Sjeffrey_1C View the latest post
Sat Mar 14, 2020 12:02 pm
Biological Examples
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Topics: 17

17 Topics

72 Posts

Last post Re: iN relation to ATP
by Daniel Yu 1E View the latest post
Sun Mar 15, 2020 11:42 pm

*Thermodynamics and Kinetics of Organic Reactions

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*Electrophiles
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Topics: 137

137 Topics

422 Posts

Last post Re: Sapling Week 7/8: Questio…
by Brennan McGurrr 3C View the latest post
Sun Feb 28, 2021 11:33 pm
*Nucleophiles
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Topics: 136

136 Topics

378 Posts

Last post Re: FInal
by VLi_2B View the latest post
Sat Mar 14, 2020 7:04 pm
*Organic Reaction Mechanisms in General
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Topics: 300

300 Topics

757 Posts

Last post Re: K meaning
by Susan Chamling 1F View the latest post
Mon Mar 01, 2021 1:37 am
*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
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Topics: 133

133 Topics

340 Posts

Last post Re: Temperature vs. activatio…
by Moura Girgis 1F View the latest post
Sun Feb 28, 2021 8:19 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
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Topics: 586

586 Topics

1663 Posts

Last post Re: Alkaline environment
by Marc Lubman 3B View the latest post
Sun Feb 21, 2021 10:59 pm
*Cycloalkanes
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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
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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
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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
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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: 28

28 Topics

75 Posts

Last post Re: Friction
by Chem_Mod View the latest post
Tue Mar 17, 2020 4:27 pm
*Haloalkenes
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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
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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
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Topics: 61

61 Topics

158 Posts

Last post Re: Nucleophile
by 804899546 View the latest post
Thu Mar 15, 2018 9:44 pm
*Aldehydes
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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
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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
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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
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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
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Topics: 63

63 Topics

154 Posts

Last post Re: Will the Final for 14B ha…
by AGaeta_2C View the latest post
Sun Mar 15, 2020 7:34 am

*Conformations of Organic Molecules

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*Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
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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
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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
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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)
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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
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Topics: 25

25 Topics

74 Posts

Last post Re: Vocabulary
by Matlynn Giles 2E View the latest post
Sun Feb 14, 2021 11:55 pm
*ChemDraw
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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
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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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Student Social/Study Group
This forum topic is for students to self-organize study groups, etc.
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Topics: 384

384 Topics

5082 Posts

Last post Re: Textbook Problem Strategi…
by Summer_Corona 3L View the latest post
Tue Mar 02, 2021 10:21 pm
Administrative Questions and Class Announcements
General non-science questions and class announcements.
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Topics: 1035

1035 Topics

7717 Posts

Last post Re: Step up vs workshops
by Taylor K 2D View the latest post
Tue Mar 02, 2021 10:22 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).
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Topics: 257

257 Topics

1530 Posts

Last post Re: Midterm 2 Reactions
by Sam_Marasigan_3D View the latest post
Tue Mar 02, 2021 8:34 pm

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