CHEMISTRY COMMUNITY

YuniLee_1K

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...

YuniLee_1K

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?

YuniLee_1K

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...

YuniLee_1K

Gisselle, did you mean first, second, and zero order reactions? I don't think this course/lower division chemistry will cover 3rd order reactions.

YuniLee_1K

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.

YuniLee_1K

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 ...

YuniLee_1K

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!

YuniLee_1K

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!

YuniLee_1K

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...

YuniLee_1K

Also, if you can't find/view the Bruincast for your lecture, chances are another lecture will have the Bruincast video up and available!

YuniLee_1K

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...

YuniLee_1K

What about coordination compounds- will we be expected to draw things like CH2CHCN (or more complicated)? How should we study/prepare for those?

YuniLee_1K

Are we expected to have all of these memorized for quiz 3 and/or final?

YuniLee_1K

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.

YuniLee_1K

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?

YuniLee_1K

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, ...

YuniLee_1K

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?

YuniLee_1K

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!

YuniLee_1K

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!)

YuniLee_1K

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!

YuniLee_1K

YuniLee_1K

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...

YuniLee_1K

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...

CHEMISTRY COMMUNITY

Search found 23 matches

Dienes? (Homework 1.21)

Memorizing Relative Energies

IUPAC naming for 3 identical substituents

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

Re: How to find my posts

Re: Cell Diagram

Re: Derivations

Re: Measuring Heat Transfer

Re: units for enthalpy problems

Re: Bruincast posting time

Re: Le Chatelier

Re: Drawings for Final

Re: Quizlet for the names of Common Ligands

M.O. Theory Conceptual Basis

Number of Molecular Orbitals

Re: Linear vs. Bent Molecular Shape

Lewis Structures on the Midterm

Re: Bruincast

Re: Exceptions for Electron Configurations

Re: Memorization Tricks

Re: Post All Chemistry Jokes Here

Re: About photons.... [ENDORSED]

Re: Multiple Limiting Reactants? [ENDORSED]