## Search found 68 matches

Sat Mar 16, 2019 9:03 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: 7th edition 6N.3a
Replies: 1
Views: 227

### Re: 7th edition 6N.3a

Mt TA had no answer for this either, I think it's safe to assume that the book mistakenly assumes there is no need for conversion.
Sat Mar 16, 2019 8:55 pm
Forum: Administrative Questions and Class Announcements
Topic: LYNDON'S PORK RAMEN REVIEW
Replies: 37
Views: 3517

### Re: LYNDON'S PORK RAMEN REVIEW

When calculating the E cell, lyndon did not use E= E cathode- E anode, would it still be ok to use this?
Sat Mar 16, 2019 8:53 pm
Forum: Balancing Redox Reactions
Topic: Electrochemical series
Replies: 2
Views: 268

### Re: Electrochemical series

Will this even be something well need on the test?
Sat Mar 16, 2019 8:52 pm
Forum: Administrative Questions and Class Announcements
Replies: 179
Views: 12599

Yes, it is further up in this thread and there is a key as well. There's also two parts!
Thu Mar 14, 2019 11:31 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation
Replies: 4
Views: 142

### Re: Arrhenius Equation

Yay! Thanks Esther:)))<3
Thu Mar 14, 2019 10:39 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Initial Concentration Question
Replies: 1
Views: 75

### Re: Initial Concentration Question

"Suppose that 3 moles of H2(g) and 6 moles of F2(g) are mixed in a 3L flask." Using this information, you can plug the moles and liters into concentration=moles/liters. Thus the initial concentration of H2, [H2] is 1 and the initial concentration of F2, [F2] is 2. These are all initial so ...
Thu Mar 14, 2019 10:33 am
Forum: *Free Energy of Activation vs Activation Energy
Topic: Modelks of Reactions
Replies: 1
Views: 448

### Re: Modelks of Reactions

I would do every homework problem in that section just in case for review for the test.
Thu Mar 14, 2019 10:31 am
Forum: Zero Order Reactions
Topic: Zero order
Replies: 10
Views: 692

### Re: Zero order

Correct, for a 0 order reaction, the reactant's concentration that is zero order would be left out
Thu Mar 14, 2019 10:27 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: rate of disappearance
Replies: 3
Views: 126

### Re: rate of disappearance

Because we will be studying rate constants bases on reactants, the rates of disappearance of reactants are likely what we'll be basing our rate laws on for the final
Thu Mar 14, 2019 10:20 am
Forum: Van't Hoff Equation
Topic: Test #2
Replies: 5
Views: 443

### Re: Test #2

I still don't conceptually understand how the pH would change if H+ and OH- are at equivalent concentrations
Thu Mar 14, 2019 10:13 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Test 2: Why is photosynthesis spontaneous?
Replies: 2
Views: 351

### Re: Test 2: Why is photosynthesis spontaneous?

So deltaH in the plant would be positive as it is absorbing heat, T would be a certain temp, 298K for example, and deltaS would also be positive?
Thu Mar 14, 2019 10:08 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation
Replies: 4
Views: 142

### Arrhenius Equation

How does one calculate the frequency factor, A, in the Arrhenius equation?
Mon Mar 11, 2019 12:24 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 7D1 (7th edition)
Replies: 1
Views: 112

### 7D1 (7th edition)

Can someone explain to me why the answer is 39 kJ instead of my answer which was 37.4 kJ?
Sun Mar 10, 2019 8:50 pm
Forum: General Rate Laws
Topic: Units for Rate Constants
Replies: 5
Views: 203

### Re: Units for Rate Constants

In the review session today, the TA said that using L is also acceptable. It's simply expanding molarity:)
Sun Mar 10, 2019 8:46 pm
Forum: Zero Order Reactions
Topic: Half Life and k
Replies: 11
Views: 617

### Re: Half Life and k

Would it be correct that you need to know either the t1/2 or the [R]o to solve anything in the half life equation?
Sun Mar 10, 2019 8:44 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Approximation
Replies: 7
Views: 270

### Re: Approximation

Is it acceptable to not round, even when permitted to, on the test?
Sun Mar 10, 2019 8:42 pm
Forum: Second Order Reactions
Topic: Rounding Reaction Orders
Replies: 4
Views: 144

### Re: Rounding Reaction Orders

Would be acceptable to not round the order and only round the value of the answer, which may be the rate constant, for example?
Sun Mar 10, 2019 8:39 pm
Forum: Zero Order Reactions
Topic: Concentration independent of the rate
Replies: 4
Views: 125

### Re: Concentration independent of the rate

It might be better put as the rate is independent of the concentration of a zeroth order reactant but yes, this is true
Sun Mar 10, 2019 8:37 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Negative Order
Replies: 4
Views: 405

### Negative Order

Would a negative order indicate that the reactant also participates in some type of reverse reaction?
Sat Feb 09, 2019 8:02 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Open vs Closed System
Replies: 13
Views: 1035

### Re: Open vs Closed System

Think this: cup=open system, water bottle=closed system, hydroflask=isolated system
Sat Feb 09, 2019 7:59 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: What is q equal to in the second law of thermodynamics?
Replies: 5
Views: 382

### Re: What is q equal to in the second law of thermodynamics?

T can be completely canceled out. Think of it as the -q=w. Because the function for work involves the multiplication of T but deltaS is q/T, the q is simply taken out and the negative sign is omitted.
Sat Feb 09, 2019 7:56 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: When n is not given
Replies: 3
Views: 143

### When n is not given

If the moles of gas is not given and not able to calculate, is it safe to assume that it is 1 mole?
Tue Feb 05, 2019 10:13 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: U clarifications
Replies: 3
Views: 160

### Re: U clarifications

So essentially, in this case, deltaU=deltaV
Tue Feb 05, 2019 10:09 pm
Forum: Calculating Work of Expansion
Topic: irreversible and reversible
Replies: 5
Views: 411

### Re: irreversible and reversible

And likewise, in some cases this fraction will be 5/2 or 7/2 depending on the molecules. The text book has a more detailed explanation.
Tue Feb 05, 2019 10:05 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Units
Replies: 2
Views: 119

### Re: Units

Sometimes one is needed to find the other, it depends on what units the answer must be in and sometimes conversions must be made accordingly
Mon Jan 28, 2019 9:37 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Cp and Cv
Replies: 5
Views: 417

### Re: Cp and Cv

If the gas constant, R, must be used, would it be given on the test?
Mon Jan 28, 2019 9:34 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: calorimeter
Replies: 2
Views: 109

### Re: calorimeter

A calorimeter measures the heat capacity of a substance under either unchanging volume or unchanging pressure.
Mon Jan 28, 2019 9:30 pm
Forum: Phase Changes & Related Calculations
Topic: Heat Capacity
Replies: 10
Views: 423

### Re: Heat Capacity

Its also important to note that occasionally the book says "molar heat" or "specific heat" which simply are shorthand for molar heat capacity and specific heat capacity respectively.
Mon Jan 21, 2019 7:35 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Percent Protonation
Replies: 6
Views: 199

### Re: Percent Protonation

Can someone give an example of this with actual chemicals and calculations?
Mon Jan 21, 2019 7:32 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ignoring x validity
Replies: 6
Views: 459

### Re: ignoring x validity

precisely, unless it is a cubic in which you would have three possible values of X. Then plug the values in to see which value is viable
Mon Jan 21, 2019 7:31 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ignoring x
Replies: 10
Views: 300

### Re: ignoring x

When k is equal to or less than 10^3 you can omit any X that is being added or subtracted. To check, see if the dissociation of the acid/base is equal to or lower than 5%
Mon Jan 21, 2019 7:30 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ignoring x
Replies: 16
Views: 993

### Re: ignoring x

When k is equal to or less than 10^3 you can omit any X that is being added or subtracted. To check, see if the dissociation of the acid/base is equal to or lower than 5%.
Sat Jan 12, 2019 6:51 pm
Forum: Ideal Gases
Topic: Pv=nRT [ENDORSED]
Replies: 12
Views: 337

### Re: Pv=nRT[ENDORSED]

What exactly does each letter represent in PV=nRT? Specifically n, is that the amount of something in moles?
Sat Jan 12, 2019 6:48 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc and Kp
Replies: 12
Views: 390

### Re: Kc and Kp

Can someone give an example of how PV=nRT is used to convert Kp to Kc? Like, does R and T end up being contained in the answer?
Sat Jan 12, 2019 6:44 pm
Forum: Ideal Gases
Topic: R and T
Replies: 3
Views: 147

### R and T

Are R and T constants? And if so, will we ever have to know their values?
Sat Dec 08, 2018 3:39 pm
Forum: Biological Examples
Topic: What should we know for the final?
Replies: 9
Views: 551

### Re: What should we know for the final?

Without myoglobin, is hemoglobin square planer about Fe?
Sat Dec 08, 2018 3:36 pm
Forum: Bond Lengths & Energies
Topic: H bonding
Replies: 14
Views: 697

### Re: H bonding

Why can it only occur with N O and F?
Sat Dec 08, 2018 3:34 pm
Forum: Conjugate Acids & Bases
Topic: Strong acids and bases to memorize
Replies: 9
Views: 927

### Re: Strong acids and bases to memorize

Why would strong acids be conjugates of weak bases and vis versa? This concept escapes me.
Sat Dec 08, 2018 3:32 pm
Forum: Conjugate Acids & Bases
Topic: Strong acids and bases to memorize
Replies: 9
Views: 927

### Re: Strong acids and bases to memorize

Yes, page 464 in the 7th edition textbook
Sat Dec 08, 2018 3:31 pm
Forum: Naming
Topic: edta 4-
Replies: 2
Views: 99

### Re: edta 4-

Would we be required to name the actual compound? ie. CH2CH2N...
Sat Dec 08, 2018 3:30 pm
Forum: Naming
Topic: en and edta
Replies: 3
Views: 151

### Re: en and edta

ethylenediamine and ethylenediaminetetraacetato respectively
Sat Dec 08, 2018 3:27 pm
Forum: Quantum Numbers and The H-Atom
Topic: Spin Magnetic Quantum Number
Replies: 6
Views: 567

### Re: Spin Magnetic Quantum Number

Ok, thanks guys!!
Sat Dec 08, 2018 3:25 pm
Forum: Administrative Questions and Class Announcements
Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Replies: 118
Views: 11191

### Re: FINAL PRACTICE - Lyndon's Churro Review Session[ENDORSED]

So when calculating the pH of an acid and base reaction, would you need to put both into one equation or write equations separately for each?
Fri Dec 07, 2018 12:11 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Ka on final, 12.25 [ENDORSED]
Replies: 3
Views: 435

### Re: Ka on final, 12.25[ENDORSED]

Is this also true for the upcoming final? (fall 2018)
Thu Dec 06, 2018 11:23 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: KA, KB values on final
Replies: 3
Views: 144

### Re: KA, KB values on final

Would the concentrations [H+] and [A] be divided by the concentration of the concentration of [HA]?
Sun Dec 02, 2018 8:58 pm
Forum: Naming
Topic: Naming Question
Replies: 5
Views: 207

### Re: Naming Question

Fe has a +2 charge. You know this because the entire ligand has a 1+ charge while Cl has a 1- charge. Thus the ligand must contain two positive charges to cancel this Cl's 1-. Since OH2 is neutral, these two positive charges are derived from Fe, giving it a 2+ charge.
Sun Dec 02, 2018 8:41 pm
Forum: Naming
Topic: drawing ligands
Replies: 6
Views: 227

### Re: drawing ligands

To convey that the transition metal (d-block metal) is bonding with the NH3 at the Nitrogen. They are both exactly the same.
Sun Dec 02, 2018 8:38 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted and Lewis Acids and Bases
Replies: 3
Views: 98

### Re: Bronsted and Lewis Acids and Bases

Could someone give a chemical reaction showing either a Bronsted Base recieving a proton or vis versa with a Bronsted Acid? I'm not sure I understand the concept.
Sat Nov 24, 2018 8:45 pm
Forum: Ionic & Covalent Bonds
Topic: Hydrogen Bonds and Van Der Waals
Replies: 4
Views: 276

### Re: Hydrogen Bonds and Van Der Waals

So could Van Der Waals bonds potentially cause a molecule that was initially non-polar to be polar? If so is this only for a moment?
Sat Nov 24, 2018 8:38 pm
Forum: Sigma & Pi Bonds
Topic: Delta Bonds
Replies: 4
Views: 174

### Re: Delta Bonds

Would it be possible to have a quadruple bond? And if so, would this consist of a delta bond?
Sat Nov 24, 2018 8:36 pm
Forum: Ionic & Covalent Bonds
Topic: Polarizability vs Polar Power
Replies: 1
Views: 117

### Polarizability vs Polar Power

Can someone explain to me the difference between polarizability and polar power?
Sun Nov 11, 2018 4:46 pm
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 6
Views: 203

### Re: Bond Lengths

Would it be safe to just assume that the bond lengths are just the average of all bond lengths on a quiz or test?
Sun Nov 11, 2018 4:44 pm
Forum: Lewis Structures
Topic: Formal charges
Replies: 15
Views: 488

### Re: Formal charges

My TA said that points might be marked off if the lewis structure was not accompanied by formal charges on the midterm. I recommend writing them just in case.
Sun Nov 11, 2018 4:43 pm
Forum: Dipole Moments
Topic: Solubility in Water
Replies: 5
Views: 267

### Re: Solubility in Water

Would it also be correct to say that the more polar a molecule is, the more soluble it is?
Wed Oct 31, 2018 6:28 pm
Forum: Quantum Numbers and The H-Atom
Topic: Spin Magnetic Quantum Number
Replies: 6
Views: 567

### Re: Spin Magnetic Quantum Number

Is there a possible way to determine whether the spin is +1/2 or -1/2?
Wed Oct 31, 2018 6:24 pm
Forum: *Shrodinger Equation
Topic: Midterm
Replies: 6
Views: 597

### Midterm

Will Schrodinger be on the midterm? If not then why is there a review session on it?
Wed Oct 31, 2018 6:21 pm
Forum: Quantum Numbers and The H-Atom
Topic: Degeneration
Replies: 3
Views: 206

### Degeneration

What is the meaning of degeneration of an element?
Fri Oct 19, 2018 12:04 pm
Forum: Trends in The Periodic Table
Topic: s, p, d, f
Replies: 16
Views: 3422

### Re: s, p, d, f

Would it be correct to say that 4d could have n=4, l=2, ml=-1, and ms=+1/2? and if so, would it be correct to assume that each possible configuration of quantum numbers for 4d represents an electron, giving the total number of electrons in that shell?
Fri Oct 19, 2018 11:59 am
Topic: Test
Replies: 9
Views: 754

### Test

Will Black Body Radiation be on the test?
Fri Oct 19, 2018 11:49 am
Forum: *Shrodinger Equation
Topic: Schrodinger Equation
Replies: 2
Views: 262

### Re: Schrodinger Equation

From my understanding, the Schrodinger Equation will not be in the test next week but Professor Lavelle taught us the equation to further understand orbitals
Mon Oct 15, 2018 12:43 pm
Forum: Properties of Light
Topic: Momentum of Photon
Replies: 4
Views: 140

### Momentum of Photon

How can the momentum of a photon be calculated when a photon is essentially massless?
Mon Oct 15, 2018 12:40 pm
Forum: Student Social/Study Group
Replies: 4
Views: 292

I don't think the date has been announced yet
Mon Oct 15, 2018 12:39 pm
Forum: Student Social/Study Group
Replies: 2
Views: 735

Does anyone know where one could find a solutions manual for the 6th edition textbook? The answers are in the back but I was hoping to find a manual with explanations. Thanks!
Fri Oct 05, 2018 2:22 am
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant vs. Reagent??? [ENDORSED]
Replies: 6
Views: 307

### Re: Limiting Reactant vs. Reagent???[ENDORSED]

Typically, the reagent is the tangible and physical form of the reactant as seen in a lab, not just a hypothetical reactant on paper.
Fri Oct 05, 2018 2:00 am
Forum: SI Units, Unit Conversions
Topic: formula units [ENDORSED]
Replies: 69
Views: 24638

### Re: formula units[ENDORSED]

From what I understand, "formula units" can be somewhat interchangeable with molecules. For example, how many formula units of H20 are in 2g of water?
the answer would be 6.7x10^22 formula units
Sun Sep 30, 2018 5:49 pm
Forum: Student Social/Study Group
Topic: Homework in 6th edition
Replies: 2
Views: 158

### Re: Homework in 6th edition

Thank you so much! I was just confused as there are Self Test answers with similar labels.
Sun Sep 30, 2018 5:45 pm
Forum: Student Social/Study Group
Topic: Hedrick Hall
Replies: 3
Views: 894

### Re: Hedrick Hall

I'm in Hedrick too! I can't join you tonight but I'd love to join the study group if it's ongoing!
Sun Sep 30, 2018 5:41 pm
Forum: Student Social/Study Group
Topic: Homework in 6th edition
Replies: 2
Views: 158

### Homework in 6th edition

What page do you find the e section answers if you're using 6th edition?