Hi Everyone,
I was wondering if we need to know how to draw a boat conformation?
Thank you
Search found 31 matches
- Sun Mar 19, 2017 10:27 am
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Details and Review Sessions Winter 2017
- Replies: 114
- Views: 26493
- Mon Mar 13, 2017 10:14 pm
- Forum: General Science Questions
- Topic: steric and torsional strain
- Replies: 2
- Views: 801
Re: steric and torsional strain
So is it correct to assume that due to the electron electron repulsion that occurs in the eclipsed conformation, there is always torsional strain ONLY in the eclipsed conformation?
Thank you!
Thank you!
- Tue Mar 07, 2017 9:47 am
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 3 Winter 2017
- Replies: 183
- Views: 28965
Re: Quiz 3 Winter 2017
Can someone please help me to understand when to use iso-, neo-, sec-, and tert, when doing IUPAC naming?
Thank you
Thank you
- Mon Feb 27, 2017 2:45 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Pre-equilibrium
- Replies: 3
- Views: 865
Re: Pre-equilibrium
The pre equilibrium approach is used when you are trying to write the rate law for a mechanism and there is a fast step followed by a slow step. You know that the overall rate law is dependent on the rate law of the slowest step, but since the slowest step is preceded by a fast step then there may b...
- Mon Feb 13, 2017 9:03 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Winter 2013 Midterm Q2A
- Replies: 10
- Views: 1499
Re: Winter 2013 Midterm Q2A
The reason you add less ice is because the orange juice has a lower heat capacity and therefore does not need as much heat to be cooled.
- Mon Feb 13, 2017 9:01 pm
- Forum: Phase Changes & Related Calculations
- Topic: Gas Constants and other constants
- Replies: 1
- Views: 325
Gas Constants and other constants
Hi Everyone,
I was wondering how you would covert the gas constant and other constants that have units in K to units in C?
Thank you so much!
I was wondering how you would covert the gas constant and other constants that have units in K to units in C?
Thank you so much!
- Mon Feb 06, 2017 4:24 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Concentration Cell
- Replies: 1
- Views: 325
Concentration Cell
Hi everyone,
I was wondering if someone could please explain how in a concentration cell, the standard potential difference is = to 0V when the components are at different concentrations?
Thank you
I was wondering if someone could please explain how in a concentration cell, the standard potential difference is = to 0V when the components are at different concentrations?
Thank you
- Tue Jan 31, 2017 10:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 1 Preparation Answers
- Replies: 130
- Views: 25164
Re: Quiz 1 Preparation Answers
Hi Everyone,
I have a question on #10.
So when I did the problem, I divided 200/20, but I was wondering if someone can please explain the conversion factor to get the answer on the key?
Thank you
I have a question on #10.
So when I did the problem, I divided 200/20, but I was wondering if someone can please explain the conversion factor to get the answer on the key?
Thank you
- Mon Jan 23, 2017 10:05 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Caliometry
- Replies: 1
- Views: 521
Caliometry
Hi everyone,
I was wondering if someone could please explain to me how caliometry allows us to calculate specific heat capacity?
Thank you so much,
Minal Reddy
I was wondering if someone could please explain to me how caliometry allows us to calculate specific heat capacity?
Thank you so much,
Minal Reddy
- Mon Jan 16, 2017 12:47 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy: State Properties
- Replies: 2
- Views: 448
Re: Enthalpy: State Properties
Hi everyone, I have a question regarding elements that are in their most stable form. Specifically, I know that Oxygen for example is in its most stable form when it is O2 and likewise for the rest of the diatomic molecules, but I was wondering if we need to know other examples of elements in their ...
- Mon Jan 09, 2017 1:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz Policy
- Replies: 2
- Views: 553
Quiz Policy
Hi Everyone,
I was wondering if anyone happens to know if the same policy (the workbook points can replace the lowest grade) that was used for the quizzes in Chem 14A with Dr. Lavelle is going to be used this quarter as well?
Thank you so much
I was wondering if anyone happens to know if the same policy (the workbook points can replace the lowest grade) that was used for the quizzes in Chem 14A with Dr. Lavelle is going to be used this quarter as well?
Thank you so much
- Sat Dec 03, 2016 1:31 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Charge of ligand
- Replies: 1
- Views: 742
Re: Charge of ligand
Dr. Lavelle recently answered this question. But it is based on the concept that that top left nitrogen has two bonds and two lone pairs therefore the formal charge is 5-6=-1.
- Sat Dec 03, 2016 1:29 pm
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: Henderson-Hasselbalch Equation
- Replies: 3
- Views: 1463
Re: Henderson-Hasselbalch Equation
The HH equation is used when considering the idea for a buffer that a weak acid and its conjugate base or a weak base and a conjugate acid must be in equal concentrations for optimum buffering capacity. Therefore when you solve the equation considering their equal concentrations, you will get that P...
- Tue Nov 29, 2016 12:46 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Treating Systems that have Small Equilibrium Constants
- Replies: 4
- Views: 1280
Re: Treating Systems that have Small Equilibrium Constants
I'm so sorry if this question has already been asked. But am I correct in remembering that Dr. Lavelle mentioned if the k value is less than 10^-4 then it is ok to approximate? Or do you just have to look at if the value of x is less than 5% of the initial concentration?
Thank you!
Thank you!
- Wed Nov 23, 2016 2:20 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Exothermic and Endothermic
- Replies: 4
- Views: 1586
Re: Exothermic and Endothermic
When the reaction is exothermic and you add heat to the products side, and if there is an increase in heat then wouldn't the reaction shift to the left not to the right?
Thank you
Thank you
- Tue Nov 22, 2016 11:04 am
- Forum: *Molecular Orbital Theory Applied To Transition Metals
- Topic: Atomic Orbitals in MO theory
- Replies: 1
- Views: 1602
Atomic Orbitals in MO theory
When we draw the atomic orbitals in an MO diagram for anions or cations do we show the added or removed electrons in our atomic orbitals or just in our molecular orbitals?
Thank you! :)
Thank you! :)
- Tue Nov 22, 2016 11:00 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Drawings for Final
- Replies: 3
- Views: 780
Re: Drawings for Final
If you are asking in regards to the vsepr structures, I would say that we do not need to know anything outside of what was covered in the course reader and on the midterm.
- Mon Nov 14, 2016 8:12 am
- Forum: Ideal Gases
- Topic: Ideal Gas Law and Equilibrium Constant
- Replies: 7
- Views: 1571
Re: Ideal Gas Law and Equilibrium Constant
Ok thank you very much.
But isn't this a concept that we have not covered yet?
But isn't this a concept that we have not covered yet?
- Fri Nov 11, 2016 8:02 pm
- Forum: Ideal Gases
- Topic: Ideal Gas Law and Equilibrium Constant
- Replies: 7
- Views: 1571
Ideal Gas Law and Equilibrium Constant
Hi, I was wondering if someone could please explain that if a question asks how an increase in the pressure or a decrease in the volume of a reaction will affect the direction the reaction favors how do you figure it out? For an example, can someone please explain Fall 2014, Question 6. What conditi...
- Mon Nov 07, 2016 11:23 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelates
- Replies: 2
- Views: 678
Chelates
I am a little confused on chelates and the monodentates and polydentates. Are chelates and polydentates ligands that can form a coordinate covalent bond with a transition metal in more than 1 place? In other words, the chelate is a name for a single ligand that has more than one electron rich atom t...
- Sun Nov 06, 2016 3:10 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: What is MO theory for? [ENDORSED]
- Replies: 20
- Views: 8858
Re: What is MO theory for? [ENDORSED]
I have a very basic question regarding drawing the molecular orbital diagrams.
Just to confirm, we draw the diagram using the number of valence electrons not the atomic number. But the atomic number determines which type of molecular orbital diagram we draw. (Z>=8 or Z<8)?
Thank you.
Just to confirm, we draw the diagram using the number of valence electrons not the atomic number. But the atomic number determines which type of molecular orbital diagram we draw. (Z>=8 or Z<8)?
Thank you.
- Mon Oct 31, 2016 9:41 am
- Forum: Octet Exceptions
- Topic: Ground state
- Replies: 2
- Views: 612
Re: Ground state
Remember that when trying to deal with isoelectronic atoms, it is often the cations and the anions that cause atoms to be isoelectronic. For example when you have a cation, you remove electrons and when you have an anion you add electrons. The adding and removing of electrons is based on the charge ...
- Mon Oct 31, 2016 9:38 am
- Forum: Dipole Moments
- Topic: Polarity
- Replies: 5
- Views: 864
Re: Polarity
To correctly determine the polarity of a molecule, it is very important to draw the molecule according to its actual shape because attempting to determine the polarity solely by looking at the lewis structure can cause you cancel out dipole moments and get a nonpolar molecule when the molecule is ac...
- Mon Oct 24, 2016 11:24 am
- Forum: Electronegativity
- Topic: Ionization Energy
- Replies: 1
- Views: 571
Re: Ionization Energy
In general, the trend of ionization energy is that is increases across a period and decreases down a group. The highest ionization energy elements exist on the upper right hand corner of the periodic table. All you have to remember for the exceptions is that Nitrogen and elements with a half filled ...
- Mon Oct 24, 2016 11:19 am
- Forum: Lewis Structures
- Topic: Central Atom
- Replies: 5
- Views: 1185
Re: Central Atom
Remember that the ionization energy increases across a period and decreases across a group.
So you would want to pick elements that are on the bottom left hand corner of the periodic table.
So you would want to pick elements that are on the bottom left hand corner of the periodic table.
- Mon Oct 17, 2016 9:05 pm
- Forum: Trends in The Periodic Table
- Topic: Electronegativity and Electron Affinity. [ENDORSED]
- Replies: 3
- Views: 1923
Re: Electronegativity and Electron Affinity. [ENDORSED]
Could anyone please remind me what the periodic trend is for electronegativity?
I was also wondering what the difference between electronegativity and ionization energy is?
Thank you so much
I was also wondering what the difference between electronegativity and ionization energy is?
Thank you so much
- Mon Oct 17, 2016 8:54 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Octet Rule Exception [ENDORSED]
- Replies: 3
- Views: 1331
Re: Octet Rule Exception [ENDORSED]
The reason is because the third row in the periodic table corresponds to the third energy level which is n=3. Given that n=3, you can have l values of 0,1,2. l=2 corresponds to a d sub level and because there are 5 orbitals in a d sub level, you can have a total of 10 electrons which is why elements...
- Tue Oct 11, 2016 11:22 pm
- Forum: Photoelectric Effect
- Topic: Module question
- Replies: 1
- Views: 542
Re: Module question
I remember that this is a two part question so you have to use the threshold energy from the first part of the experiment!
You can't solve the problem without this value:)
You can't solve the problem without this value:)
- Tue Oct 11, 2016 11:20 pm
- Forum: Balancing Chemical Reactions
- Topic: Determining States of Matter in Reactions
- Replies: 7
- Views: 1508
Re: Determining States of Matter in Reactions
I spoke to some TA's regarding the same questions about listing the states of matter, and they said that for the purposes of this quiz, you should mainly focus on the balancing part of the equation. But I don't think that it hurts if you list the states of matter if you know them!
- Wed Oct 05, 2016 12:43 pm
- Forum: DeBroglie Equation
- Topic: Post Module Question [ENDORSED]
- Replies: 3
- Views: 840
Re: Post Module Question [ENDORSED]
Perhaps, there is an error in your calculations because when you multiply the given wavelength by the mass of the electron you get a value that is 6.63*10^-39. Then when you divide "h" Planck's constant by that value you must get 1*10^5. In regards to if the answer is reasonable, I know th...
- Sun Sep 25, 2016 12:01 pm
- Forum: SI Units, Unit Conversions
- Topic: Including Units in a Problem
- Replies: 3
- Views: 816
Including Units in a Problem
I have a question regarding including si units when we are solving a problem on any form of assessment?
Is it necessary to include units at all times or only in the final answer?
Thnak you very much.
Is it necessary to include units at all times or only in the final answer?
Thnak you very much.