Search found 58 matches

by Jesse H 2L
Sun Mar 15, 2020 2:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Athena
Replies: 34
Views: 1868

Re: Athena

Thank u Athena and Dr. DJ LAVELLE for the best in the business post-lecture songs
by Jesse H 2L
Mon Mar 09, 2020 12:01 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: n in NFE
Replies: 19
Views: 160

Re: n in NFE

the moles of electrons transferred
by Jesse H 2L
Mon Mar 09, 2020 12:00 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst
Replies: 10
Views: 98

Re: Nernst

Brandon Tao 1K wrote:What is nernst equation?


the equation developed by Nernst E=E with the little degree circle - RT/nF nlQ
by Jesse H 2L
Sun Mar 08, 2020 11:59 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst
Replies: 10
Views: 98

Re: Nernst

I used the log form for like literally everything.
by Jesse H 2L
Sun Mar 08, 2020 11:58 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: linear plots
Replies: 7
Views: 114

Re: linear plots

know the axis and the orientation of the plot
by Jesse H 2L
Sun Mar 08, 2020 11:56 pm
Forum: General Rate Laws
Topic: Elementary reactions
Replies: 5
Views: 24

Re: Elementary reactions

elementary as in simple, noncomplex, easy problems so to speak
by Jesse H 2L
Sun Mar 08, 2020 11:55 pm
Forum: Balancing Redox Reactions
Topic: Reversing the anode
Replies: 10
Views: 122

Re: Reversing the anode

to get the real cell potential, we need to reverse the anode reduction reaction to make it an oxidation reaction.
by Jesse H 2L
Sun Mar 01, 2020 11:25 pm
Forum: General Rate Laws
Topic: Preferred way to write reaction rate
Replies: 5
Views: 52

Re: Preferred way to write reaction rate

I mean, you can always just multiply the entire equation by a coefficient to get rid of the 1/2
by Jesse H 2L
Sun Mar 01, 2020 11:21 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Direction of flow
Replies: 5
Views: 31

Re: Direction of flow

in a galvanic cell, the electrons flow in the spontaneous direction, and this flow of electrons is how the battery works, and is generally the only direction of flow, (anode to cathode), the salt bridge allows for ionization and keeps the solutions neutral.
by Jesse H 2L
Sun Mar 01, 2020 11:17 pm
Forum: Administrative Questions and Class Announcements
Topic: what to know for test 2
Replies: 10
Views: 96

Re: what to know for test 2

electrochemistry
by Jesse H 2L
Sun Mar 01, 2020 11:16 pm
Forum: Balancing Redox Reactions
Topic: 6K.3d
Replies: 5
Views: 64

Re: 6K.3d

[Cl][/2] is both reduced and oxidized, since the oxidized form is given, we need to find the reduced form.
by Jesse H 2L
Sun Mar 01, 2020 11:06 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Anode and Cathode
Replies: 8
Views: 65

Re: Anode and Cathode

the electrons flow from the oxidation half reaction in the anode and flow into the reduction half reaction of the cathode (an ox, red cat)
by Jesse H 2L
Sun Feb 23, 2020 5:49 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 118
Views: 32099

Re: Final Jitters

a ridiculous amount of practice problems.
by Jesse H 2L
Sun Feb 23, 2020 5:48 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 5G.15
Replies: 5
Views: 72

Re: 5G.15

the answer key is wrong for sure
by Jesse H 2L
Sun Feb 23, 2020 5:40 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Le Chatelier’s Principle
Replies: 11
Views: 94

Re: Le Chatelier’s Principle

increasing concentrations of products and reactants will cause the reaction to shift the same according to le chateliers principle.
by Jesse H 2L
Sun Feb 23, 2020 5:38 pm
Forum: Balancing Redox Reactions
Topic: Balancing redox reactions
Replies: 5
Views: 44

Re: Balancing redox reactions

John Liang 2I wrote:The main principle is focus on charge first when balancing the redox rxn. When the number of electrons are balanced on both sides, the elements are probably going to be balanced. this is faster than looking at the elements first. hope this helps!

does this apply under any conditions?
by Jesse H 2L
Fri Feb 21, 2020 9:56 pm
Forum: General Science Questions
Topic: THE RETURN OF DJ LAVELLE [ENDORSED]
Replies: 6
Views: 115

Re: THE RETURN OF DJ LAVELLE [ENDORSED]

Samuel G Rivera - Discussion 4I wrote:I'm in the 3pm lecture, but if it's the same song he played for us it's called Hazey by Glass Animals

ur a savior, thank you.
by Jesse H 2L
Fri Feb 21, 2020 2:01 pm
Forum: General Science Questions
Topic: THE RETURN OF DJ LAVELLE [ENDORSED]
Replies: 6
Views: 115

THE RETURN OF DJ LAVELLE [ENDORSED]

DOES ANYONE KNOW THE NAME OF THE SONG DR. DJ LAVELLE WAS BOPPIN' TODAY AFTER CLASS? (FRIDAY 2/21/20 1PM LECTURE) THANKS.
by Jesse H 2L
Sun Feb 09, 2020 2:57 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Nonlinear vs linear molecules
Replies: 4
Views: 51

Re: Nonlinear vs linear molecules

net rotational degrees of freedom, linear molecules only have 2, nonlinear molecules have 3 and the degrees of freedom contribute to the heat capacity.
by Jesse H 2L
Sun Feb 09, 2020 2:56 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: What the calorimeter allows you to calculate according to conditions
Replies: 5
Views: 115

Re: What the calorimeter allows you to calculate according to conditions

at constant volume, deltaV = 0, so there is no w expansion work being done, which means deltaU is only equal to q (deltaU=q+w). At constant pressure, expansion work may be occurring, and this change can only be deltaH or q as a result of the heat given off.
by Jesse H 2L
Sun Feb 09, 2020 2:46 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: combustion rxn
Replies: 2
Views: 42

combustion rxn

What was the equation that Lavelle shared for calculating the change in mols for a combustion rxn?
by Jesse H 2L
Sun Feb 09, 2020 2:44 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Topics on the Midterm
Replies: 22
Views: 216

Re: Topics on the Midterm

Basically everything up to outline 4, excluding the stuff from chapter 5.
by Jesse H 2L
Sun Feb 02, 2020 7:34 pm
Forum: *Organic Reaction Mechanisms in General
Topic: K meaning
Replies: 6
Views: 102

Re: K meaning

approx 1.380649×10−23 J/K
by Jesse H 2L
Sun Feb 02, 2020 7:28 pm
Forum: Phase Changes & Related Calculations
Topic: Why does steam cause burns?
Replies: 29
Views: 243

Re: Why does steam cause burns?

Steam has way more energy than liquid as a result of the energy required to vaporize liquid, and as a result, the phase change releases more energy onto your skin in the form of heat and burns more
by Jesse H 2L
Sun Feb 02, 2020 12:18 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calorimetry
Replies: 4
Views: 52

Re: Calorimetry

Does the substance in the bomb calorimeter get heat added to it? In my mind, I feel like that would mess up the measurement of the heat released by the actual reaction. I thought that the experiments in the bomb calorimeter had to spontaneously occur? Bomb calorimeters still require a heat source, ...
by Jesse H 2L
Sun Feb 02, 2020 12:13 am
Forum: Phase Changes & Related Calculations
Topic: standard reaction enthalpy vs. standard enthalpy of formation
Replies: 7
Views: 182

Re: standard reaction enthalpy vs. standard enthalpy of formation

standard reaction enthalpy is the enthalpy for the overall reaction while standard enthalpy of formation is the enthalpy of one mole of product formed from its parts
by Jesse H 2L
Sun Feb 02, 2020 12:09 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: H and q
Replies: 7
Views: 62

Re: H and q

delta h and q are the same at constant pressure.
by Jesse H 2L
Sun Jan 19, 2020 9:16 pm
Forum: Ideal Gases
Topic: Kp given instead of Kc
Replies: 8
Views: 77

Re: Kp given instead of Kc

Use PV=nRT
by Jesse H 2L
Sun Jan 19, 2020 9:11 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: pKa
Replies: 13
Views: 83

Re: pKa

inverse relationship, high Ka, low pka means stronger acid, low Ka, high pka weaker acid
by Jesse H 2L
Sun Jan 19, 2020 9:09 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Relationship between pressure and volume
Replies: 10
Views: 73

Re: Relationship between pressure and volume

inversely proportional, and an increase in volume in a system is only recognized if it is the result of change in volume, which is usually assumed unless the problem involves pumping an inert gas into a system
by Jesse H 2L
Sun Jan 19, 2020 9:07 pm
Forum: Ideal Gases
Topic: Topics on Test 1
Replies: 37
Views: 386

Re: Topics on Test 1

most certainly outline 1.
by Jesse H 2L
Sun Jan 19, 2020 8:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: composite chemical equations
Replies: 2
Views: 28

composite chemical equations

can someone explain composite equations, as in hw 5h.3? thanks
by Jesse H 2L
Sun Jan 12, 2020 7:38 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 5I.13 part c
Replies: 2
Views: 34

Re: 5I.13 part c

Thermodynamic stability referring to the relative energy of the closed systems, in which the lowest energy is considered more "thermodynamically" stable.
by Jesse H 2L
Sun Jan 12, 2020 7:33 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Changes in pressure
Replies: 4
Views: 46

Re: Changes in pressure

I know that the quick way to explain the changes in pressure is that if the volume decreases and there are more moles of gas on the left, then the reaction proceeds to the right and vice versa. But why is this the short way? If you know that the volume decreases, then you also know that there is st...
by Jesse H 2L
Sun Jan 12, 2020 7:30 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 5.61
Replies: 3
Views: 35

Re: 5.61

we cannot increase the concentration of a pure solid or liquid in an equilibrium expression so it is regarded as equal to 1 and hence ignored in calculation.
by Jesse H 2L
Sun Jan 12, 2020 7:28 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Test 1
Replies: 6
Views: 67

Re: Test 1

According to the testing schedule posted on the syllabus, Test 1 should be on 1/21/2020, in discussion section.
by Jesse H 2L
Sun Jan 12, 2020 12:56 pm
Forum: Ideal Gases
Topic: converting Kc to Kp
Replies: 13
Views: 131

Re: converting Kc to Kp

is it better to convert all values of Kc to Kp before continuing to solve a problem (making an ICE table and so on...) using the ideal gas equation, or is it better to do it as the textbook instructs?
by Jesse H 2L
Sun Dec 01, 2019 7:54 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: ligands
Replies: 1
Views: 22

ligands

how do we determine if a ligand is polydentate?
by Jesse H 2L
Sun Dec 01, 2019 7:45 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: sigma bond
Replies: 7
Views: 176

Re: sigma bond

A sigma bond is just an area of two orbitals overlapping creating a significant area of electron density.
by Jesse H 2L
Sun Dec 01, 2019 7:41 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Weak vs. Strong Acids
Replies: 3
Views: 30

Re: Weak vs. Strong Acids

Based on disassociation. An acid is strong when it completely dissociates in water, and is weak when it only partially dissociates. Higher or lower acidity is usually relative.
by Jesse H 2L
Sun Dec 01, 2019 7:33 pm
Forum: *Crystal Field Theory
Topic: Crystal Field Theory
Replies: 3
Views: 195

Re: Crystal Field Theory

Will CTF be of any major significance on the final?
by Jesse H 2L
Sun Dec 01, 2019 7:30 pm
Forum: Naming
Topic: chelating
Replies: 3
Views: 44

chelating

How do we determine whether or not chelation occurs in a molecule? Thanks
by Jesse H 2L
Sat Oct 19, 2019 1:30 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Hund's rule
Replies: 5
Views: 53

Re: Hund's rule

Hund's rule.
by Jesse H 2L
Sat Oct 19, 2019 1:26 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodal Planes
Replies: 10
Views: 93

Re: Nodal Planes

505316964 wrote:Can someone explain why s has no nodal plane? thanks!


there aren't enough electrons that exist within that orbital to form nodes in which case a plane would form, electrons can exist wherever they want within the spherical s orbital
by Jesse H 2L
Sat Oct 19, 2019 1:22 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodal Planes
Replies: 10
Views: 93

Re: Nodal Planes

if atoms with more electrons have more places where electrons can be found, why does this also increase the amount of nodal planes in that atom? electrons push each other away, more electrons means more pushing each other way until they shape the orbitals, more orbitals means more chances for nodal...
by Jesse H 2L
Sat Oct 19, 2019 1:19 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodal Planes
Replies: 10
Views: 93

Re: Nodal Planes

Natalie C 1K wrote:if atoms with more electrons have more places where electrons can be found, why does this also increase the amount of nodal planes in that atom?


electron pair repulsion creates gaps
by Jesse H 2L
Sat Oct 19, 2019 1:15 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Midterm
Replies: 3
Views: 37

Re: Midterm

I think it wouldn't hurt to brush up on some general chem just to be safe.
by Jesse H 2L
Sun Oct 13, 2019 11:57 pm
Forum: Properties of Light
Topic: Homework
Replies: 11
Views: 110

Re: Homework

Anything, in this case, from topic 2 (the quantum world) included in the outline.
by Jesse H 2L
Sun Oct 13, 2019 11:55 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 4906

Re: Test 1 [ENDORSED]

all materials were to be provided in discussion.
by Jesse H 2L
Sun Oct 13, 2019 11:53 pm
Forum: Properties of Light
Topic: MidTerms and Finals
Replies: 11
Views: 129

Re: MidTerms and Finals

Midterms yes, finals TBA.
by Jesse H 2L
Sun Oct 13, 2019 11:52 pm
Forum: Properties of Light
Topic: Intensity of Light
Replies: 2
Views: 35

Re: Intensity of Light

A higher frequency results in more energy per photon so that each photon has enough energy to eject electrons. Increasing the intensity of light means more photons, more photons with enough energy means more ejected electrons.
by Jesse H 2L
Sun Oct 13, 2019 11:51 pm
Forum: Properties of Light
Topic: Wave Frequency
Replies: 9
Views: 109

Re: Wave Frequency

I believe that the frequency is the amount of energy per photon according to the wave model.
by Jesse H 2L
Tue Oct 01, 2019 12:33 am
Forum: Limiting Reactant Calculations
Topic: How to Find a Mass of A Product
Replies: 4
Views: 57

Re: How to Find a Mass of A Product

law of conservation of mass
by Jesse H 2L
Tue Oct 01, 2019 12:18 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Accuracy vs Precision
Replies: 10
Views: 183

Re: Accuracy vs Precision

precision is consistent results while accuracy is how close to the true value we can get.
by Jesse H 2L
Mon Sep 30, 2019 11:57 pm
Forum: Limiting Reactant Calculations
Topic: Using mols or grams
Replies: 4
Views: 89

Re: Using mols or grams

converting to moles is likely a more reliable strategy and probably just a better habit
by Jesse H 2L
Mon Sep 30, 2019 11:52 pm
Forum: SI Units, Unit Conversions
Topic: mol, g.mol and g.mol-1
Replies: 12
Views: 210

Re: mol, g.mol and g.mol-1

g.mol-1 is interchangeable with g/mol, the exponent -1 denoting the fraction

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