Search found 23 matches

by YuniLee_1K
Sat Mar 18, 2017 9:11 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Dienes? (Homework 1.21)
Replies: 1
Views: 520

Dienes? (Homework 1.21)

Do we have to know how to use diene when naming? Or can we consider a molecule with a diene structure as one carbon chain with substituents on it and name it using IUPAC? I don't remember learning this during lecture (although it's in the ochem textbook), and I'm not sure if this is something I shou...
by YuniLee_1K
Fri Mar 17, 2017 6:28 am
Forum: *Calculations Using ΔG° = -RT ln K
Topic: Memorizing Relative Energies
Replies: 1
Views: 515

Memorizing Relative Energies

Will we have to memorize all of the relative energies of conformation given during the lectures, or will they be given on the final exam in order to do calculations?
by YuniLee_1K
Fri Mar 10, 2017 3:30 am
Forum: *Alkanes
Topic: IUPAC naming for 3 identical substituents
Replies: 1
Views: 270

IUPAC naming for 3 identical substituents

IN the case of three identical substituents on one chain, say two methyl groups attached to the second carbon and one methyl group attached to the fourth carbon in hexane, how would you name it by IUPAC standards? Would it be 2,2,4-Trimethyl-Hexane? I guess I'm just trying to know if the # of identi...
by YuniLee_1K
Mon Mar 06, 2017 12:31 am
Forum: Second Order Reactions
Topic: Is there such a thing as a Third Order Reaction?
Replies: 5
Views: 805

Re: Is there such a thing as a Third Order Reaction?

Gisselle, did you mean first, second, and zero order reactions? I don't think this course/lower division chemistry will cover 3rd order reactions.
by YuniLee_1K
Sun Mar 05, 2017 10:21 pm
Forum: Administrative Questions and Class Announcements
Topic: How to find my posts
Replies: 45
Views: 36902

Re: How to find my posts

I believe you can also just search your username in the search bar and any of your posts/threads you added on to should show up! Let me know if that works for you guys.
by YuniLee_1K
Sun Feb 19, 2017 2:35 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram
Replies: 11
Views: 789

Re: Cell Diagram

In some of the homework answers in the solution manual, the cell diagram is depicted as "solid | solid | soln || soln | solid", essentially with more than one solid on one side of the set-up. When does this sort of electrochemistry set-up occur, and why is there a line rather than a comma ...
by YuniLee_1K
Sun Feb 12, 2017 1:35 pm
Forum: Phase Changes & Related Calculations
Topic: Derivations
Replies: 21
Views: 2133

Re: Derivations

I think since most of the derivations are based on prior knowledge and using substitution from other equations, it would be probable that you can look at the question asked, look at what you're given, and see what concepts they have in common in order to derive the equation!
by YuniLee_1K
Tue Jan 24, 2017 12:40 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Measuring Heat Transfer
Replies: 3
Views: 314

Re: Measuring Heat Transfer

Delta U is only equal to delta H when the volume of reactants equals the volume of products. This is because since q = delta H at constant pressure (aka qp = delta H), delta U = qp + w, and w = 0 when the volumes are equal, delta U = qp + w = delta H + w = delta H. Hope this helped!
by YuniLee_1K
Wed Jan 18, 2017 1:29 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: units for enthalpy problems
Replies: 4
Views: 483

Re: units for enthalpy problems

For standard reaction enthalpy, it's assumed that the amount of substance in question is 1 mole. So while the unit is typically written as kJ/mol, for standard rxn enthalpy this would be the same as writing kJ/1 mol = kJ, so they would be interchangeable. I think as long as you make sure the problem...
by YuniLee_1K
Wed Jan 11, 2017 12:27 am
Forum: Administrative Questions and Class Announcements
Topic: Bruincast posting time
Replies: 2
Views: 276

Re: Bruincast posting time

Also, if you can't find/view the Bruincast for your lecture, chances are another lecture will have the Bruincast video up and available!
by YuniLee_1K
Fri Dec 02, 2016 1:00 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier
Replies: 3
Views: 385

Re: Le Chatelier

An increase in pressure occurs when you decrease volume (smaller container = particles bounce off walls more often and thus create more pressure inside). When volume decreases, the reaction will want to shift in a way to maintain equilibrium (i.e. make the moles of reactants roughly = moles of produ...
by YuniLee_1K
Tue Nov 22, 2016 4:56 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Drawings for Final
Replies: 3
Views: 448

Re: Drawings for Final

What about coordination compounds- will we be expected to draw things like CH2CHCN (or more complicated)? How should we study/prepare for those?
by YuniLee_1K
Thu Nov 17, 2016 1:05 am
Forum: Naming
Topic: Quizlet for the names of Common Ligands
Replies: 10
Views: 1128

Re: Quizlet for the names of Common Ligands

Are we expected to have all of these memorized for quiz 3 and/or final?
by YuniLee_1K
Mon Nov 14, 2016 2:44 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: M.O. Theory Conceptual Basis
Replies: 2
Views: 310

M.O. Theory Conceptual Basis

Hi, can anyone explain to me the concepts behind the Molecular Orbital Theory, and how/why we derive the M.O. diagrams? I understand how to make the diagrams but I'm not sure if we need to delve any deeper into the concepts for quiz 3 or the final.
by YuniLee_1K
Mon Nov 07, 2016 2:52 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Number of Molecular Orbitals
Replies: 2
Views: 355

Number of Molecular Orbitals

I understand how to determine the actual number of molecular orbitals for a molecule, but I think I'm still a little confused on assigning molecular orbitals (in terms of sigma* or pi2s, etc). How do we determine this?
by YuniLee_1K
Wed Nov 02, 2016 12:25 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Linear vs. Bent Molecular Shape
Replies: 4
Views: 19811

Re: Linear vs. Bent Molecular Shape

Angular/bent structures occur when the central atom has 4 regions of electron density (tetrahedral), 2 consisting of bonds and 2 consisting of lone pairs, aka AX2E2. Linear structures occur either: 1. when there are 3 atoms with the central having two regions of electron density with no lone pairs, ...
by YuniLee_1K
Tue Nov 01, 2016 2:17 am
Forum: Administrative Questions and Class Announcements
Topic: Lewis Structures on the Midterm
Replies: 2
Views: 396

Lewis Structures on the Midterm

If we answer questions on the midterm asking to show the Lewis structure of a molecule, and answer with a drawing of the molecule with different angles from the VSEPR model (not just 90 degree angles), will we be docked points? Or is the answer okay if it is the correct VSEPR shape?
by YuniLee_1K
Tue Nov 01, 2016 1:59 am
Forum: Administrative Questions and Class Announcements
Topic: Bruincast
Replies: 26
Views: 8091

Re: Bruincast

I don't think there's a function on Bruincast that allows you to change the speed at which you watch the lecture. However, I have heard about students who I think downloaded individual lectures and then changed the playing speed on an alternate application. Hope that works for you!
by YuniLee_1K
Thu Oct 27, 2016 12:31 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions for Electron Configurations
Replies: 3
Views: 1866

Re: Exceptions for Electron Configurations

Hey Raven, what do you mean by ground state? I'm confused about how to find ground state electron configurations (or what that even means to be honest!)
by YuniLee_1K
Thu Oct 27, 2016 12:24 am
Forum: Hybridization
Topic: Memorization Tricks
Replies: 9
Views: 1545

Re: Memorization Tricks

Wait to return to the original question, does anyone have tips for remembering the exceptions (like 3d^10 and 3d^5)? I think I'm still confused about those. Thanks!
by YuniLee_1K
Wed Oct 12, 2016 2:53 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1014769

Re: Post All Chemistry Jokes Here

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by YuniLee_1K
Tue Oct 04, 2016 12:09 am
Forum: Photoelectric Effect
Topic: About photons.... [ENDORSED]
Replies: 3
Views: 388

Re: About photons.... [ENDORSED]

The photoelectric effect experiment actually discovered this as a way to disprove the accuracy of the quantum mechanics description of light! Increasing the intensity of the light (or increasing the number of photons) did not result in a higher amount of electrons removed from the metal surface. Sin...
by YuniLee_1K
Tue Sep 27, 2016 2:27 am
Forum: Limiting Reactant Calculations
Topic: Multiple Limiting Reactants? [ENDORSED]
Replies: 4
Views: 1655

Re: Multiple Limiting Reactants? [ENDORSED]

I agree with Jose! In each reaction, there is one limiting reactant, and the other reactants are in excess. Once the limiting reactant is used up, that particular reaction can no longer occur because the amount of product that can be formed is limited, even though there are remaining materials due t...

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