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: 388
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: 7454
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: 2006
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
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
- Replies: 179
- Views: 23130
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
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: 452
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: 233
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: 1128
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: 1625
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: 529
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: 740
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: 669
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: 452
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: 249
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: 526
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: 1751
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: 1259
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: 468
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: 530
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: 783
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: 4492
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: 704
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: 361
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: 414
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: 767
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: 324
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: 829
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: 288
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: 932
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: 515
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: 847
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: 862
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: 3260
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: 736
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: 1683
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: 434
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: 988
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: 1469
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: 1509
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: 1509
Re: Strong acids and bases to memorize
Yes, page 464 in the 7th edition textbook
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: 626
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: 924
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: 21029
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: 619
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: 354
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: 713
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: 552
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: 203
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: 575
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: 388
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: 243
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: 553
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: 1234
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: 1820
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: 924
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: 1004
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: 449
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: 4299
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
- Forum: *Black Body Radiation
- Topic: Test
- Replies: 9
- Views: 1265
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: 404
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: 360
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
- Topic: Test Grades
- Replies: 4
- Views: 540
Re: Test Grades
I don't think the date has been announced yet
- Mon Oct 15, 2018 12:39 pm
- Forum: Student Social/Study Group
- Topic: 6th Edition Answers
- Replies: 2
- Views: 1223
6th Edition Answers
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: 772
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: 32540
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
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: 236
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: 1237
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: 236
Homework in 6th edition
What page do you find the e section answers if you're using 6th edition?