Search found 68 matches

by Anita Wong 1H
Sun Mar 17, 2019 5:53 pm
Forum: Balancing Redox Reactions
Topic: How to balance half reaction
Replies: 5
Views: 24

Re: How to balance half reaction

what i do is add the h2o to balance out the Os, then add H to balance H, then for the amount of H you add, add the same amount of OH to each side. The oh and h should combine to form h2o with can be added to/subtracted. just simplify from there!
by Anita Wong 1H
Sun Mar 17, 2019 5:47 pm
Forum: Van't Hoff Equation
Topic: neutral pH not 7?
Replies: 6
Views: 31

Re: neutral pH not 7?

its different at varying temperatures
by Anita Wong 1H
Sun Mar 17, 2019 5:46 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Ecell
Replies: 2
Views: 17

Re: Ecell

theyre dependent on what youre given/what you want to find
by Anita Wong 1H
Sun Mar 17, 2019 5:44 pm
Forum: *Enzyme Kinetics
Topic: Catalysts
Replies: 7
Views: 47

Re: Catalysts

so does that mean the amount of product and reactant is or isnt affected by adding a catalyst?
by Anita Wong 1H
Sun Mar 17, 2019 5:43 pm
Forum: *Enzyme Kinetics
Topic: How do you tell if something is a catalyst vs an intermediate?
Replies: 13
Views: 72

Re: How do you tell if something is a catalyst vs an intermediate?

catalysts are in the reactant and intermediate is in the product side
by Anita Wong 1H
Sun Mar 17, 2019 5:42 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: U=0
Replies: 6
Views: 39

Re: U=0

yes! deltaU= 0 for isothermal reversible expansion
by Anita Wong 1H
Sun Mar 17, 2019 5:40 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: DeltaU = 3/2 nRT
Replies: 3
Views: 23

Re: DeltaU = 3/2 nRT

for monatomic gases!
by Anita Wong 1H
Sun Mar 17, 2019 5:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 200
Views: 40703

Re: Saying Thank You to Dr. Lavelle

Thank you Dr. Lavelle for being so kind and very interested in what you're teaching! it makes learning more engaging! I am glad to have had you as a professor for 2 quarters!
by Anita Wong 1H
Sun Mar 17, 2019 5:34 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: tripotic acid
Replies: 2
Views: 12

Re: tripotic acid

polyprotic acids contain more than one acidic proton. three acidic protons make it triprotic
by Anita Wong 1H
Sun Mar 17, 2019 5:32 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: w=-PdeltaW
Replies: 5
Views: 26

Re: w=-PdeltaW

you use it for irreverible reactions. usually youre given the external pressure pushing onto the system and you need to find the work of the systemm pushing out against the external pressure. and its w = -pdeltav
by Anita Wong 1H
Sun Mar 17, 2019 5:30 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: pKa vs. pH
Replies: 15
Views: 145

Re: pKa vs. pH

pka is in reference to ka whereas ph is in reference to H+
by Anita Wong 1H
Sun Mar 17, 2019 5:27 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Bimolecular
Replies: 13
Views: 79

Re: Bimolecular

Henry Dudley 1G wrote:Can a bimolecular reaction be third order if one of the reactants is second order?

no i believe theyre directly related so thats not possible
by Anita Wong 1H
Sat Mar 16, 2019 11:37 am
Forum: Student Social/Study Group
Topic: class pictures
Replies: 15
Views: 435

Re: class pictures

Here’s another set!
by Anita Wong 1H
Sat Mar 16, 2019 11:36 am
Forum: Student Social/Study Group
Topic: class pictures
Replies: 15
Views: 435

Re: class pictures

Here are more pictures!
by Anita Wong 1H
Fri Mar 15, 2019 12:05 pm
Forum: Student Social/Study Group
Topic: class pictures
Replies: 15
Views: 435

Re: class pictures

David Sarkissian 1K wrote:How do you post pictures? I have a decent one from up front, but I don’t know how to post it.



Refer to this: viewtopic.php?f=176&t=3916
by Anita Wong 1H
Sun Feb 24, 2019 5:10 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Spontaneous?
Replies: 6
Views: 49

Re: Spontaneous?

when its negative its spontaneous. when its positive its not spontaneous.
by Anita Wong 1H
Sun Feb 24, 2019 5:09 pm
Forum: Balancing Redox Reactions
Topic: TEST
Replies: 7
Views: 56

Re: TEST

material up to but not including nernst equation
by Anita Wong 1H
Sun Feb 24, 2019 5:08 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Test 3
Replies: 14
Views: 134

Re: Test 3

MichaelMoreno2G wrote:Up to what section of electrochemistry do we need to study? I'm still a little confused so if someone can clarify that would be greatly appreciated.

up to but not including nernst
by Anita Wong 1H
Sun Feb 24, 2019 5:04 pm
Forum: Balancing Redox Reactions
Topic: Oxidation
Replies: 4
Views: 42

Re: Oxidation

this is what i found: https://socratic.org/questions/why-is-l ... -oxidation
it had to do with what they thought in the early days of chemistry
by Anita Wong 1H
Sun Feb 24, 2019 5:01 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Regrades
Replies: 2
Views: 34

Re: Midterm Regrades

I would ask your ta
by Anita Wong 1H
Sun Feb 24, 2019 4:56 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox equations in Basic conditions
Replies: 3
Views: 47

Re: Balancing Redox equations in Basic conditions

they both go on the left side
by Anita Wong 1H
Sun Feb 24, 2019 4:47 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy
Replies: 2
Views: 29

Re: Gibbs Free Energy

gibbs free energy of formation is the change of Gibbs free energy that accompanies the formation of 1 mole of a substance in its standard state.
by Anita Wong 1H
Sun Feb 10, 2019 3:36 pm
Forum: Calculating Work of Expansion
Topic: Real processes
Replies: 2
Views: 36

Re: Real processes

heres some examples: The simplest examples given in thermodynamics texts are the reversible and irreversible expansion of a gas. If you have a gas in a container connected to an evacuated container, and you open the stop-cock between them, the gas will expand without doing any work. This process is ...
by Anita Wong 1H
Sun Feb 10, 2019 3:31 pm
Forum: Calculating Work of Expansion
Topic: Reversible vs Irreversible
Replies: 9
Views: 75

Re: Reversible vs Irreversible

In a irreversible reaction, the reactants react to form the products, which cannot revert back into reactants. In reversible reactions, as the reactants react with other reactants to form products, the products are reacting with other products to form reactants. Combustion cannot be undone. i am not...
by Anita Wong 1H
Sun Feb 10, 2019 3:29 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: types of reversible processes
Replies: 1
Views: 21

Re: types of reversible processes

i think thats all we need to know
by Anita Wong 1H
Fri Feb 01, 2019 8:25 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Different Kinds of Symptoms
Replies: 6
Views: 54

Re: Different Kinds of Symptoms

open system: glass of tea evaporating
closed system: boba drink with the plastic seal
isolated system: calorimeter
by Anita Wong 1H
Fri Feb 01, 2019 8:20 pm
Forum: Calculating Work of Expansion
Topic: Isolated System
Replies: 5
Views: 67

Re: Isolated System

no you shouldnt consider the heat of the surroundings in an isolated system
by Anita Wong 1H
Fri Feb 01, 2019 8:13 pm
Forum: Ideal Gases
Topic: pV=nRT
Replies: 12
Views: 119

Re: pV=nRT

is is a given constant! should be in the equations sheet or in the problem
by Anita Wong 1H
Sat Jan 26, 2019 4:31 pm
Forum: Phase Changes & Related Calculations
Topic: work and heat
Replies: 2
Views: 35

Re: work and heat

because a state property's value is determined by its current state and not dependent on the path taken to obtain that state
by Anita Wong 1H
Sat Jan 26, 2019 4:26 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bonds being broken in reaction
Replies: 4
Views: 46

Re: Bonds being broken in reaction

the stronger the bond, the more energy it requires to break it
by Anita Wong 1H
Sat Jan 26, 2019 4:25 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Ka
Replies: 6
Views: 79

Re: Ka

strong acids dont have ka values. if you see a ka value, its most likely a weak acid
by Anita Wong 1H
Mon Jan 21, 2019 4:36 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pressure
Replies: 7
Views: 73

Re: Pressure

dont include solids and liquids. only include gases and aqueous solutions
by Anita Wong 1H
Mon Jan 21, 2019 4:35 pm
Forum: Administrative Questions and Class Announcements
Topic: TA posted slides (dis 1B)
Replies: 1
Views: 62

Re: TA posted slides (dis 1B)

its under Board index > Chem 14B > Administrative Questions and Class Announcements > Yekan Discussion slides (1B, 1H, 1J)
by Anita Wong 1H
Mon Jan 21, 2019 4:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Strong and Weak Acids
Replies: 3
Views: 43

Re: Strong and Weak Acids

At equal concentrations, a strong acid will typically have a lower pH than a weak acid, since the strong one will donate more protons to the solution.
by Anita Wong 1H
Fri Jan 11, 2019 4:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q and K
Replies: 13
Views: 129

Re: Q and K

When comparing the two, usually you’ll be given K and you’ll have to calculate Q.
by Anita Wong 1H
Fri Jan 11, 2019 4:35 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle [ENDORSED]
Replies: 3
Views: 36

Re: Le Chatelier's Principle [ENDORSED]

In lecture today, Professor Lavelle gave us the reaction N2(g) + 3H2(g) --> 2NH3(g) and described what would happen if we increased N2, increased NH3, and decreased H2. Can someone please explain to me each scenario, I am a bit confused still. If you increased N2, which is the reactant, a forward r...
by Anita Wong 1H
Fri Jan 11, 2019 4:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Expression K
Replies: 3
Views: 45

Re: Equilibrium Expression K

Actually I found out that it’s most likely a TB error and the 7 N2 should have been a 5 N2
by Anita Wong 1H
Wed Jan 09, 2019 10:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Expression K
Replies: 3
Views: 45

Re: Equilibrium Expression K

Jessica Chen 1F wrote:The equation definitely has to be balanced before you plug things in to solve K because the stoichiometric coefficients matter as the exponents.

does that mean the solution manual is wrong then?
by Anita Wong 1H
Wed Jan 09, 2019 10:30 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Expression K
Replies: 3
Views: 45

Equilibrium Expression K

I noticed that for 11.3 in the 6th edition that the equation isn't balanced. In the solutions manual, the answer is from the original/given equation. I thought we always had to balance equations... Are we supposed to leave the equation as it is when writing the equilibrium expression K? 11.3 Write t...
by Anita Wong 1H
Sun Dec 02, 2018 10:05 pm
Forum: Dipole Moments
Topic: Strength of intramolecular forces due to polarity
Replies: 5
Views: 91

Re: Strength of intramolecular forces due to polarity

If you have a substance with nonpolar molecules , the only Intermolecular Forces of Attraction that exist are London-Dispersion forces, which are very weak. Therefore, a polar substance will have a stronger attraction between its molecules than a substance with nonpolar molecules.
by Anita Wong 1H
Sun Dec 02, 2018 9:57 pm
Forum: Lewis Acids & Bases
Topic: Determining Acidity or Basic
Replies: 2
Views: 46

Re: Determining Acidity or Basic

To determine whether a substance is an acid or a base, count the hydrogens on each substance before and after the reaction. If the number of hydrogens has decreased that substance is the acid (donates hydrogen ions). If the number of hydrogens has increased that substance is the base (accepts hydrog...
by Anita Wong 1H
Sun Dec 02, 2018 9:55 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted Acid vs Lewis Acid
Replies: 2
Views: 43

Re: Bronsted Acid vs Lewis Acid

the Bronsted definition: an acid is a proton (H+ ion) donor, and a base is a proton acceptor

the Lewis definition: an acid is an electron acceptor, and a base is an electron donor.
by Anita Wong 1H
Sun Nov 25, 2018 7:44 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic bonds
Replies: 1
Views: 29

Re: Ionic bonds

when the electronegativity difference is greater than 2.0, the bond is considered ionic.
by Anita Wong 1H
Sun Nov 25, 2018 7:42 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: bonding vs anti bonding orbitals
Replies: 2
Views: 61

Re: bonding vs anti bonding orbitals

Electrons in bonding orbitals stabilize the molecule because they are between the nuclei. Antibonding orbitals place less electron density between the nuclei. The nuclear repulsions are greater, so the energy of the molecule increases. Antibonding orbitals are at higher energy levels than bonding or...
by Anita Wong 1H
Sun Nov 25, 2018 7:39 pm
Forum: Student Social/Study Group
Topic: Final
Replies: 12
Views: 234

Re: Final

I’d assume so
by Anita Wong 1H
Sun Nov 18, 2018 7:44 pm
Forum: Dipole Moments
Topic: Dipoles
Replies: 3
Views: 68

Re: Dipoles

in a non-polar molecule, the whole molecule has zero dipole moment but bonds are polar. When two non-polar molecules comes closer to each other, the negative part (electrons) of one molecule attract the positive part (nucleus) of another molecule. As a result, two dipoles are induced.
by Anita Wong 1H
Sun Nov 18, 2018 7:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Shape
Replies: 5
Views: 67

Re: Determining Shape

yes i believe so
by Anita Wong 1H
Sun Nov 18, 2018 7:38 pm
Forum: Resonance Structures
Topic: Bond Length
Replies: 4
Views: 99

Re: Bond Length

im not quite sure what your question is but i believe you are asking about the bond lengths of resonance and non resonance structures? what do you mean by in what context do we discuss them in?
by Anita Wong 1H
Thu Nov 08, 2018 6:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm [ENDORSED]
Replies: 14
Views: 308

Re: Midterm [ENDORSED]

our ta will hand it to us after lecture
by Anita Wong 1H
Thu Nov 08, 2018 5:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: HW for discussion
Replies: 9
Views: 174

Re: HW for discussion

chapter 3!
by Anita Wong 1H
Thu Nov 08, 2018 5:57 pm
Forum: Quantum Numbers and The H-Atom
Topic: Test Quantum Numbers
Replies: 4
Views: 79

Re: Test Quantum Numbers

l= 0,1,2,3
orbitals: s,p,d,f

since l is i that means its in the p orbital which can hold up to 6 electrons (two on each __ __ __)
by Anita Wong 1H
Sat Nov 03, 2018 11:17 am
Forum: Lewis Structures
Topic: Electron Affinity
Replies: 2
Views: 26

Re: Electron Affinity

i know thar electron affinity and ionization energy are related. But i know that from lecture it was mentioned that elements towards the right have a lower ionization energy and elements towards the left have a higher ionization energy. When drawing the lewis dot structures, the element with the lea...
by Anita Wong 1H
Sat Nov 03, 2018 11:13 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Negative Energy
Replies: 1
Views: 37

Re: Negative Energy

all energys on the energy levels are negative. its just a matter of becoming less negative when it moves down an energy level
by Anita Wong 1H
Sat Nov 03, 2018 11:10 am
Forum: Trends in The Periodic Table
Topic: Metals, metalloids, and nonmetals
Replies: 3
Views: 54

Re: Metals, metalloids, and nonmetals

you should know by the placement on the periodic table. just search it up and youll find images! when i went to the periodic trends review session the ta said we should know stuff like that
by Anita Wong 1H
Fri Oct 26, 2018 8:35 pm
Forum: Lewis Structures
Topic: writing the structure
Replies: 5
Views: 41

Re: writing the structure

start off wherever you want. It completely up to you but try to make it balanced in a way i guess
by Anita Wong 1H
Fri Oct 26, 2018 8:24 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Using Heisenberg's Equation
Replies: 3
Views: 98

Re: Using Heisenberg's Equation

they are both the same! they are just written differently! the h over 2 pi is call h bar and it yields the same result!
by Anita Wong 1H
Fri Oct 26, 2018 8:21 pm
Forum: Properties of Light
Topic: Is light in waves or photons?
Replies: 10
Views: 213

Re: Is light in waves or photons?

Light has both wave and photon/particle properties!
by Anita Wong 1H
Fri Oct 26, 2018 8:20 pm
Forum: Properties of Light
Topic: Quantum Test
Replies: 11
Views: 256

Re: Quantum Test

since lavelle will not be posting anymore modules, I heard the course reader helps alot!
by Anita Wong 1H
Thu Oct 18, 2018 11:16 pm
Forum: Properties of Light
Topic: Test 2 [ENDORSED]
Replies: 15
Views: 229

Re: Test 2 [ENDORSED]

yeah just chapter 1 and 2 for quantum world
by Anita Wong 1H
Thu Oct 18, 2018 11:14 pm
Forum: Properties of Light
Topic: Do I have to memorize the spectrum?
Replies: 20
Views: 237

Re: Do I have to memorize the spectrum?

I think during lecture he said we should just know the general order of the spectrum.
by Anita Wong 1H
Thu Oct 18, 2018 11:01 pm
Forum: Einstein Equation
Topic: Homework Question 1.55 (6th edition)
Replies: 2
Views: 45

Re: Homework Question 1.55 (6th edition)

You would use v/c=3600 cm^-1 v=frequency and c=speed of light
from there just plug in the speed of light and solve for v which is the frequency
by Anita Wong 1H
Fri Oct 12, 2018 5:27 pm
Forum: DeBroglie Equation
Topic: Negative Sign
Replies: 4
Views: 41

Re: Negative Sign

joonsoo explained it right! Because we are going from a higher energy level to a lower energy level, the change in energy is negative since we are going down energy levels.
by Anita Wong 1H
Fri Oct 12, 2018 3:40 pm
Forum: Properties of Light
Topic: Plack's constant
Replies: 2
Views: 40

Re: Plack's constant

I'm not entirely sure. But i assume it cannot be any other value other than what it already is since it is a 'constant'
by Anita Wong 1H
Fri Oct 12, 2018 3:38 pm
Forum: Significant Figures
Topic: Calculators
Replies: 16
Views: 287

Re: Calculators

I like my calculator because you can scroll and use the last answer to solve another problem! So if you calculate the molar mass of a compound you don't have to re type it! It's the Ti-30xs! I really recommend it!
by Anita Wong 1H
Thu Oct 04, 2018 12:56 pm
Forum: Balancing Chemical Reactions
Topic: Formula for nitric acid
Replies: 3
Views: 83

Re: Formula for nitric acid

I'd say just search up the formulas for the review. He will probably tell us later which ones to memorize if we ever need to. I wouldn't worry about memorizing for the test too if he specifically said we don't need to memorize them yet.
by Anita Wong 1H
Thu Oct 04, 2018 12:45 pm
Forum: Limiting Reactant Calculations
Topic: Fundamentals 7th Edition M1
Replies: 2
Views: 64

Re: Fundamentals 7th Edition M1

As per what the instructions on page F97 say: Since we are given the actual yield (25.2 g N2H4), we need to calculate the theoretical yield. 1) Start with the given mass of the reactant : 35.0 g NH3 2) Divide the mass by the molar mass of reactant NH3 to get the amount (mol) of reactant : 35.0 g NH3...
by Anita Wong 1H
Wed Oct 03, 2018 9:48 pm
Forum: Empirical & Molecular Formulas
Topic: Homework
Replies: 2
Views: 78

Re: Homework

I'm guessing just maybe the date the assignment is due? Other than that I think what you posted is good!

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