Search found 108 matches
- Sat Mar 16, 2019 10:31 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: change in cell potential
- Replies: 1
- Views: 410
change in cell potential
Is the change in cell potential E-E(standard) or E(standard)-E
- Fri Mar 15, 2019 3:14 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: cell diagram order, review session
- Replies: 2
- Views: 300
cell diagram order, review session
Today in review session, the cathode/reduction reactions was Br2(g) -> 2Br-(aq), but in the cell diagram, Br-(aq) comes before Br2(g). So in what cases do we abandon the reactant to product convention in the cell diagram, and put the product first? Is this always the case that the aqueous has to be ...
- Thu Mar 14, 2019 5:51 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: given Ecell
- Replies: 2
- Views: 352
given Ecell
If the given Ecell is positive, can we assume its a galvanic cell and the standard Ecell will also be positive? If so, would the same be the case if the given Ecell is negative can I assume that the standard Ecell is negative and the cell is electrolytic?
- Thu Mar 14, 2019 4:49 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 7th edition 6N.7b
- Replies: 1
- Views: 291
Re: 7th edition 6N.7b
Yeah I have the same question
- Tue Mar 12, 2019 8:01 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: pre-equilibrium question
- Replies: 2
- Views: 339
pre-equilibrium question
If there are three steps in a reaction, two of which are fast, how do we know for which of the two to find K and substitute?
- Tue Mar 12, 2019 4:41 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: delta H of reaction
- Replies: 2
- Views: 574
delta H of reaction
When given delta H of a reaction, I'm confused as to when you multiply and when you divide delta H by the amount of moles of a reactant
- Mon Mar 11, 2019 4:26 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Pre-equilibrium approach
- Replies: 1
- Views: 247
Pre-equilibrium approach
I feel like even after doing the homework, I have yet to use the pre-equilibrium approach to solve any problem. Or I may just be using it unconsciously. Does anyone have an example in section 7C (7th edition) that implements concepts from the pre-equilibrium approach? Thanks!
- Mon Mar 11, 2019 2:45 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: electrolytic cell
- Replies: 1
- Views: 267
electrolytic cell
Why is it that the species with the greater reduction potential is preferentially reduced?
- Sun Mar 10, 2019 7:47 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Microscopic reversibility
- Replies: 2
- Views: 339
Microscopic reversibility
What is microscopic reversibility?
- Sun Mar 10, 2019 7:46 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Slowest step
- Replies: 4
- Views: 529
Re: Slowest step
We ignore the faster, because it is negligible when considering the overall rate.
- Sun Mar 10, 2019 7:44 pm
- Forum: Balancing Redox Reactions
- Topic: Part c of question 6 on test 2
- Replies: 1
- Views: 241
Part c of question 6 on test 2
I was confused on this question. It asks to write the two species that would give the largest Ecell. Does anyone know how to solve this?
- Thu Mar 07, 2019 6:54 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Question 9.13 (Sixth Edition)
- Replies: 3
- Views: 443
Re: Question 9.13 (Sixth Edition)
Isn't the formula for entropy of temperature using C, not R? Is this a mistake in the book?
- Sun Mar 03, 2019 5:19 pm
- Forum: Second Order Reactions
- Topic: first vs. second order
- Replies: 2
- Views: 446
first vs. second order
How is a second order reaction different than a first order reaction?
- Sun Mar 03, 2019 5:18 pm
- Forum: Zero Order Reactions
- Topic: zeroth order rate
- Replies: 4
- Views: 720
Re: zeroth order rate
Assuming that there are no other reactants, it is simply k.
- Sun Mar 03, 2019 5:17 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: kinetic control
- Replies: 2
- Views: 373
kinetic control
What is kinetic control and how does It relate to kinetics?
- Tue Feb 26, 2019 9:52 pm
- Forum: Balancing Redox Reactions
- Topic: Half reactions
- Replies: 1
- Views: 230
Half reactions
If a question asks for the balanced half reactions, is the final answer with or without multiplying the half reaction through by a number (in the case that you need to match the electrons transferred in both half reactions)?
- Tue Feb 26, 2019 8:54 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: H2O and H+ in Cell Diagrams
- Replies: 1
- Views: 220
Re: H2O and H+ in Cell Diagrams
I'm pretty sure H+ and OH- are included, but you don't include H20 because saying H+ and OH- are aqueous assumes that they're in water
- Tue Feb 26, 2019 7:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
- Replies: 179
- Views: 21909
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
For #6 on the Gibbs free energy worksheet, how do we know that delta G is zero? Also, if delta G is zero and delta S of system is zero, why isn't delta S of surroundings also 0?
- Tue Feb 26, 2019 7:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
- Replies: 179
- Views: 21909
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
For #4 on the Gibbs worksheet, I keep getting -42.2 kj/mol and I can't figure out what I'm doing wrong
- Tue Feb 26, 2019 2:28 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6M.13 in 7th edition
- Replies: 1
- Views: 241
6M.13 in 7th edition
in part d, the reduction equation is: O3(g)+H20(l)+2e- --> O2(g)+2OH-
Why does OH-(aq) come before O3(g),O2(g) in the cell diagram, when it is a product of the half reaction?
Why does OH-(aq) come before O3(g),O2(g) in the cell diagram, when it is a product of the half reaction?
- Tue Feb 26, 2019 12:28 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: #14.11 Part d (Sixth edition)
- Replies: 2
- Views: 274
Re: #14.11 Part d (Sixth edition)
I have the same question
- Mon Feb 25, 2019 11:31 pm
- Forum: Balancing Redox Reactions
- Topic: OH or H20
- Replies: 2
- Views: 295
OH or H20
When do we use OH versus H2O to balance the hydrogens on both sides. Are they interchangeable?
- Sun Feb 24, 2019 8:40 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: ions
- Replies: 2
- Views: 294
ions
Can we assume that an ion in either the cathode or anode half reaction is always aqueous (if the phase is not given)? If so, why?
- Sun Feb 24, 2019 7:41 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Interpreting cell diagram
- Replies: 1
- Views: 204
Interpreting cell diagram
If given a cell diagram such as this:
Ag(s) I AgI(S) I I-(aq) II....
How would I know if Ag + I make up the reactants or the products for the anode half reaction of the cell?
Ag(s) I AgI(S) I I-(aq) II....
How would I know if Ag + I make up the reactants or the products for the anode half reaction of the cell?
- Sun Feb 24, 2019 6:43 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell diagrams
- Replies: 1
- Views: 211
Cell diagrams
I understand that in a cell diagram, the left side are where the anode half reaction and the right side is cathode half reactions. However, I am confused about the order to list each individual element/ion in each half reaction. Is it: Anode reactant I Anode product II Cathode reactant I cathode pro...
- Sun Feb 24, 2019 3:38 pm
- Forum: Administrative Questions and Class Announcements
- Topic: What topics are going to be on Test 2?
- Replies: 4
- Views: 431
Re: What topics are going to be on Test 2?
Does anyone know where that goes up to in the 7th edition textbook?
- Fri Feb 22, 2019 2:58 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2
- Replies: 7
- Views: 812
Test 2
Will test 2 cover "The Definition of Standard Potential" and "The Electrochemical Series" (6.M.1-2 in 7th edition)?
- Fri Feb 22, 2019 2:38 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6L.5 part c (7th edition)
- Replies: 1
- Views: 165
6L.5 part c (7th edition)
Write the half-reactions, the balanced equation, and the cell diagram for: Cl2(g) +H2(g) --> HCl (aq) So the cathode reaction is: Cl2 + 2e- --> 2Cl- And the anode reaction (after reversal) is: H2 --> 2H+ + 2e- In the answer, Cl-(aq) comes before Cl2 (g), and I am wondering why that is the case.
- Thu Feb 21, 2019 9:03 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6L.3 7th ed. Write the half reactions and balanced equation for the cell reaction.
- Replies: 2
- Views: 358
Re: 6L.3 7th ed. Write the half reactions and balanced equation for the cell reaction.
I have the same question
- Sun Feb 17, 2019 2:53 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs and Enthalpy
- Replies: 4
- Views: 469
Re: Gibbs and Enthalpy
Gibbs free energy refers specifically to the energy that can be used as work
- Sun Feb 17, 2019 2:51 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Calculating G if H and S are gven
- Replies: 3
- Views: 438
Re: Calculating G if H and S are gven
If we have the value when the system is in equilibrium and delta G =0, then we can find the behavior (in terms of spontaneity) for any temperatures above or below that value.
- Sun Feb 17, 2019 1:29 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: spontaneity
- Replies: 2
- Views: 261
spontaneity
Why is it that if a reaction is spontaneous it will favor the forward reaction?
- Tue Feb 12, 2019 11:46 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lyndon's HOTDOG MIDTERM REVIEW SESSION!! FINALLY!
- Replies: 49
- Views: 11230
Re: Lyndon's HOTDOG MIDTERM REVIEW SESSION!! FINALLY!
For #10, should both heat capacities (of ice and of water be the same), or should we use the heat capacity of ice on the left side of the equation. I remember at the review he used 4.184 for both, but shouldn't we take into account C of ice as well?
- Tue Feb 12, 2019 6:46 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
- Replies: 179
- Views: 21909
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Does anyone know how to solve #9?
- Tue Feb 12, 2019 6:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lyndon's HOTDOG MIDTERM REVIEW SESSION!! FINALLY!
- Replies: 49
- Views: 11230
Re: Lyndon's HOTDOG MIDTERM REVIEW SESSION!! FINALLY!
for #6, how do we know that change in entropy is zero?
- Tue Feb 12, 2019 4:40 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
- Replies: 179
- Views: 21909
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Kenan Kherallah 2C wrote:For question 4, Im just wondering if the condition is temperature at zero or if the change (delta T) of temperature is zero so an isothermal condition?
I was wondering the same thing.
- Tue Feb 12, 2019 11:52 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: enthalpy units
- Replies: 1
- Views: 270
enthalpy units
When solving for the change of enthalpy of a reaction either using bond enthalpies or enthalpy of formation, should our answer be in kj/mol or just kj?
- Sun Feb 10, 2019 7:21 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: equations for q
- Replies: 9
- Views: 820
Re: equations for q
Always look at the units and how they cancel. That should indicate which to use.
- Sun Feb 10, 2019 7:20 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Ideal Gas Laws
- Replies: 4
- Views: 546
Re: Ideal Gas Laws
When you are given all the components besides for one in the ideal gas law, or if the question states to assume the gas is ideal, it's an indicator that you may need to use the ideal gas law. Also, if you feel you aren't given enough information to solve the question using formulas you've learned in...
- Sun Feb 10, 2019 7:17 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Equation sheet for midterm
- Replies: 3
- Views: 455
Re: Equation sheet for midterm
Yes. It's helpful to look at it before to get familiar with where things are.
- Thu Feb 07, 2019 12:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
- Replies: 179
- Views: 21909
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
for #6, shouldn't the work be -12.4kJ?
w=-PxdV = (-122atm/L)(101.33J/atmL) = -12.4kJ
w=-PxdV = (-122atm/L)(101.33J/atmL) = -12.4kJ
- Thu Feb 07, 2019 11:50 am
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
- Replies: 179
- Views: 21909
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
For the first law worksheet, how do you do #2? First you have to do stoichiometry to find how many moles of Pb is made from 49.7 g PbO. You multiply the number of moles of product times the enthalpy value given, which gives you the q to plug into your regular q=mC s (Tf-Ti). Once you solve for mass...
- Tue Feb 05, 2019 10:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
- Replies: 179
- Views: 21909
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
For the first law worksheet, how do you do #2?
- Tue Feb 05, 2019 11:34 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: closed systems
- Replies: 6
- Views: 572
closed systems
Are closed systems either at constant volume nor at constant pressure?
- Tue Feb 05, 2019 11:27 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: isolated systems
- Replies: 2
- Views: 244
isolated systems
Does an isolated system always imply constant volume?
- Sun Feb 03, 2019 11:45 pm
- Forum: Phase Changes & Related Calculations
- Topic: State Function
- Replies: 10
- Views: 793
Re: State Function
A state function only depends on the initial and final states - the path from getting form one to the other does not affect its value. Heat is an example of something that is not a state function.
- Sun Feb 03, 2019 11:42 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Midterm [ENDORSED]
- Replies: 49
- Views: 4433
Re: Midterm [ENDORSED]
Review all your notes to make sure you've grasped the material conceptually. If there's anything you don't understand you can check the textbook to clear things up. Then after you've done that do the assigned homework - it's really good practice.
- Sun Feb 03, 2019 11:40 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: implications of open vs closed beakers
- Replies: 2
- Views: 289
implications of open vs closed beakers
Why does an open beaker imply constant pressure? What does a closed beaker imply?
- Sun Jan 27, 2019 2:45 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 144128
Re: Reading the textbook
If I ever attempt a homework problem and don't fully understand it, I read the corresponding section in the textbook and it's very helpful.
- Sun Jan 27, 2019 2:38 pm
- Forum: Phase Changes & Related Calculations
- Topic: Week 4 Homework
- Replies: 12
- Views: 1163
Week 4 Homework
Can our homework for week 4 be anything from sections 4A-4D (7TH EDITION)?
- Sun Jan 27, 2019 2:36 pm
- Forum: Phase Changes & Related Calculations
- Topic: State property
- Replies: 3
- Views: 342
State property
What are the implications of something being a state property?
- Tue Jan 22, 2019 9:47 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
- Replies: 179
- Views: 21909
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
For #5 on worksheet 1, don't we need the value of R to calculate the volume?
- Tue Jan 22, 2019 5:32 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: percent ionization
- Replies: 1
- Views: 237
percent ionization
What is the formula for percent ionization for acids and for bases?
- Mon Jan 21, 2019 6:39 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: weak acids/bases
- Replies: 2
- Views: 523
weak acids/bases
If Ka or Kb is given, can we assume that what we're dealing with is a weak acid or base
- Mon Jan 21, 2019 6:38 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: difficulties recognizing weak acids and bases
- Replies: 9
- Views: 1440
Re: difficulties recognizing weak acids and bases
Just a note: it is helpful to remember that nitrogen with a lone pair means it's a weak base
- Mon Jan 21, 2019 6:37 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: percent ionization
- Replies: 2
- Views: 476
percent ionization
What's the difference between percent ionization, percent protonated, and percent deprotonated?
- Thu Jan 17, 2019 9:49 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: 6B.9 (7th edition)
- Replies: 1
- Views: 450
6B.9 (7th edition)
For this question, why can't we use [H30+][OH-]=10^-14 for the concentration of H30+ in (ii)?
When I try to use it, I get [H30+]=6.67x10^-15 so I know it's wrong.
When I try to use it, I get [H30+]=6.67x10^-15 so I know it's wrong.
- Thu Jan 17, 2019 9:46 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: when is x negligible
- Replies: 7
- Views: 6516
when is x negligible
When can we assume that [OH-]=[H30+]? Is it when Kw is less than 10^3?
- Thu Jan 17, 2019 9:44 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: sigfigs for acids/bases
- Replies: 3
- Views: 376
sigfigs for acids/bases
I know Dr. Lavelle mentioned this in class, but what are the sigfig rules for pH/pOH? Also, is there any situation where we disregard this rule?
- Tue Jan 15, 2019 1:58 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: test 1 [ENDORSED]
- Replies: 7
- Views: 844
test 1 [ENDORSED]
Does anyone know if test 1 covers only everything up to and including Le Chatelier's principle, or if it also includes acids and bases?
- Tue Jan 15, 2019 1:52 pm
- Forum: Ideal Gases
- Topic: pressure [ENDORSED]
- Replies: 13
- Views: 985
Re: pressure [ENDORSED]
Increasing temperature increases pressure, and we know this because of the ideal gas law.
- Tue Jan 15, 2019 1:49 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: positive vs. negative delta H
- Replies: 2
- Views: 43551
positive vs. negative delta H
Is it true that when delta H is positive it's endothermic and if delta H is negative it's exothermic? If so, why is that?
- Tue Jan 15, 2019 1:47 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: partial pressure
- Replies: 2
- Views: 171
partial pressure
Do we treat a change in partial pressure the same way we would a change in molar concentrations?
- Wed Jan 09, 2019 9:30 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Equilibrium constant
- Replies: 1
- Views: 111
Equilibrium constant
I'm still confused as to the conceptual reason behind not including units for K. Can anyone explain?
- Wed Jan 09, 2019 9:27 pm
- Forum: Ideal Gases
- Topic: Units
- Replies: 19
- Views: 1023
Re: Units
We use Kelvin because as Dr. Lavelle mentioned in the beginning of 14A, Kelvin is an absolute scale (0 K is absolute zero).
- Wed Jan 09, 2019 7:51 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: #26 on post-assessment
- Replies: 1
- Views: 127
#26 on post-assessment
I don't know how to do the following question. Does anyone know how and can explain it conceptually? Question: A mixture initially consisting of 0.250 N2 (g) and 0.500 M H2 (g) reacts to form NH3 (g) which is 0.15 M NH3 (g) at equilibrium. Calculate the concentration of N2 (g) at equilibrium for the...
- Thu Dec 06, 2018 11:32 am
- Forum: Air Pollution & Acid Rain
- Topic: acid rain
- Replies: 4
- Views: 546
acid rain
What is the acid rain equation that includes nitrogen?
- Sun Dec 02, 2018 3:21 pm
- Forum: Lewis Acids & Bases
- Topic: acid names
- Replies: 8
- Views: 671
acid names
Are we expected to know the formula for acetic acid, phosphoric acid, bromous acid, etc.?
- Sun Dec 02, 2018 2:18 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted vs. Lewis
- Replies: 3
- Views: 444
Bronsted vs. Lewis
Are bronsted and Lewis acids the same? When is using one more correct than using the other?
- Sun Dec 02, 2018 1:14 pm
- Forum: Naming
- Topic: Polydentate
- Replies: 2
- Views: 156
Re: Polydentate
So bidentate isn't considered polydentate? Only tridentate+?
- Sun Dec 02, 2018 1:04 pm
- Forum: Naming
- Topic: H20 monodentate
- Replies: 1
- Views: 256
H20 monodentate
Why isn't H20 polydentate, even though the oxygen has two lone pairs?
- Sun Dec 02, 2018 12:56 pm
- Forum: Naming
- Topic: Polydentate
- Replies: 2
- Views: 156
Polydentate
How can you determine if a molecule is polydentate?
- Tue Nov 27, 2018 6:43 pm
- Forum: Ionic & Covalent Bonds
- Topic: greater ionic character
- Replies: 5
- Views: 461
Re: greater ionic character
Wait, I read it wrong, sorry.
- Tue Nov 27, 2018 6:37 pm
- Forum: Ionic & Covalent Bonds
- Topic: greater ionic character
- Replies: 5
- Views: 461
Re: greater ionic character
I looked at a periodic table with electronegativity
- Tue Nov 27, 2018 6:35 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: dipole-dipole
- Replies: 1
- Views: 163
dipole-dipole
If a molecule is polar, does that mean it must be possible for the molecule to experience a dipole-dipole interaction?
- Tue Nov 27, 2018 5:55 pm
- Forum: Ionic & Covalent Bonds
- Topic: greater ionic character
- Replies: 5
- Views: 461
Re: greater ionic character
CO2 is father apart, but CS2 is more electronegative
- Tue Nov 27, 2018 5:35 pm
- Forum: Ionic & Covalent Bonds
- Topic: greater ionic character
- Replies: 5
- Views: 461
greater ionic character
If I'm not given a chart of electronegativity, how would I determine which has more ionic character: CO2 or CS2
- Tue Nov 27, 2018 12:52 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: London dispersion
- Replies: 1
- Views: 137
London dispersion
In regards to London dispersion, what is the significance of this formula:
Ep prop to a1a2/r^6
Ep prop to a1a2/r^6
- Mon Nov 26, 2018 5:22 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma vs. pi
- Replies: 1
- Views: 207
Sigma vs. pi
If length and strength are inversely proportional to one another, why is it that sigma bonds are both larger and stronger than pi bonds?
- Sun Nov 25, 2018 5:52 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: induced-dipole
- Replies: 4
- Views: 647
induced-dipole
What's the difference between a dipole and an induced-dipole?
- Sun Nov 25, 2018 5:51 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: hydrogen bonding
- Replies: 4
- Views: 832
hydrogen bonding
What really is hydrogen bonding and why is it important? Also, how attractive is the force of hydrogen bonding?
- Sun Nov 25, 2018 5:49 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: covalent character
- Replies: 1
- Views: 283
covalent character
The textbook says that the greater distortion of the electron cloud on the anion, the greater the covalent character. Why is that the case?
- Mon Nov 19, 2018 1:09 pm
- Forum: Hybridization
- Topic: hybridization
- Replies: 2
- Views: 299
hybridization
In what way does hybridization explain bond strength?
- Mon Nov 19, 2018 1:07 pm
- Forum: Hybridization
- Topic: promotion energy
- Replies: 1
- Views: 178
promotion energy
Why doesn't it take a lot of energy to promote Carbon? Are there any atoms for which there are very high promotion energies?
- Mon Nov 19, 2018 12:52 pm
- Forum: Hybridization
- Topic: Hybridization bonds
- Replies: 2
- Views: 157
Re: Hybridization bonds
When two atoms bond head on they create a sigma bond. When there's a double bond, the first bond is a sigma bond, but the second bond of the double bond can't face the other atom head on. Instead, it overlaps side by side as a result of repulsion from the first bond. This is the reason that a single...
- Mon Nov 12, 2018 2:08 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizability and polarizing power
- Replies: 1
- Views: 431
Polarizability and polarizing power
What are the conceptual reasons behind the trends of polarizability and polarizing power? Specifically, why are both affected by size, effective nuclear charge, and electronegativity?
- Mon Nov 12, 2018 2:02 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Distortion
- Replies: 3
- Views: 400
Distortion
I'm confused as to what distortion of electron clouds actually means in the context of polarizability and polarizing power. Can someone explain the concept of smaller/larger distortions?
- Mon Nov 12, 2018 2:00 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing Power
- Replies: 5
- Views: 478
Re: Polarizing Power
High polarizing power means it's smaller, has a higher effective nuclear charge, and higher electronegativity.
- Wed Nov 07, 2018 10:04 pm
- Forum: Electronegativity
- Topic: ionic vs. covalent bonding
- Replies: 2
- Views: 315
Re: ionic vs. covalent bonding
The rule does not apply for those cases.
- Wed Nov 07, 2018 9:56 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: How does size affect polarizing power/ polarizability
- Replies: 3
- Views: 3477
Re: How does size affect polarizing power/ polarizability
Polarizability is directly related to size, while polarizing power is inversely related to size.
- Wed Nov 07, 2018 9:47 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing Power vs Polarisabiltiy
- Replies: 2
- Views: 268
Re: Polarizing Power vs Polarisabiltiy
It helps to remember that polarizability is larger and inversely related to electronegativity and positive charge, and that polarizing power is smaller and directly related to electronegativity and positive charge.
- Mon Oct 29, 2018 11:23 pm
- Forum: Ionic & Covalent Bonds
- Topic: ionization energy
- Replies: 3
- Views: 397
Re: ionization energy
Higher ionization energy means more energy is required to remove an electron, so the atom is less likely to form a cation, which requires the removal of an electron.
- Mon Oct 29, 2018 11:20 pm
- Forum: Lewis Structures
- Topic: Expanded octet
- Replies: 3
- Views: 269
Re: Expanded octet
Electrons in an atom with d orbital can fit 10 in the d orbital, which allows for an expanded octet.
- Mon Oct 29, 2018 10:35 pm
- Forum: Lewis Structures
- Topic: lewis structures
- Replies: 3
- Views: 170
lewis structures
What are the exceptions to the octet rule? Is Br one of them?
- Mon Oct 22, 2018 5:43 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: question 42 on post assessment
- Replies: 2
- Views: 400
Re: question 42 on post assessment
I really appreciate the response and understand how you came to your answer. What's bothering me, however, is that I end up with n^2 being 10.3. This is my work: change of e = hv = 7.56 x 10^-20 = Rh/(n1)^2 - Rh/(n2)^2 When I plug n2=4 into the equation and add that to hv that leaves me with the fol...
- Mon Oct 22, 2018 4:42 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: question 42 on post assessment
- Replies: 2
- Views: 400
question 42 on post assessment
An excited hydrogen atom emits light with a frequency of 1.14 x 10^14 Hz to reach the energy level n = 4. In what principle quantum level did the electron begin? I keep solving and getting the incorrect answer. Can someone please solve this (not using Rydberg equation) and actually compute the numbe...
- Sun Oct 21, 2018 2:26 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Equation
- Replies: 6
- Views: 633
Re: Equation
I read that it was derived by integrating wave functions over the bell curve.
- Sun Oct 21, 2018 2:24 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Schrodinger's Wave Function
- Replies: 10
- Views: 894
Re: Schrodinger's Wave Function
You need to understand the conceptual implications of the equation, specifically regarding wave functions and orbitals. You don't need to know calculations.
- Sun Oct 21, 2018 2:13 pm
- Forum: Properties of Light
- Topic: Wavelengths and frequencies
- Replies: 10
- Views: 622
Re: Wavelengths and frequencies
There were one or two questions on the homework that required you to know specific wavelengths, so it may be helpful to know.
- Mon Oct 15, 2018 4:16 pm
- Forum: Properties of Light
- Topic: 1A.3 7th Edition Question
- Replies: 4
- Views: 433
Re: 1A.3 7th Edition Question
It's a fancy way of saying wavelength increases, and we know that because c = wavelength x frequency