Search found 29 matches

by Mimi Lec 2H
Sun Mar 12, 2017 10:23 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Cis & Trans
Replies: 3
Views: 330

Re: Cis & Trans

The Z and E designations come from the German words zusammen, which means together, and entgegen, which means opposite. You can find this in section 1.4 Geometric Isomers in the organic chem textbook (page 14 at the bottom)
by Mimi Lec 2H
Tue Feb 28, 2017 4:33 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy
Replies: 2
Views: 293

Re: Entropy

Solids have lower molar entropy than liquids, and liquids have lower molar entropy of gases. In the gas phase, a compound has the highest molar entropy. I think there will be a decrease in entropy for this equation, because of the conversion of a gas and a liquid which have high molar entropy, into ...
by Mimi Lec 2H
Tue Feb 28, 2017 1:43 am
Forum: *Alkanes
Topic: Name the compound
Replies: 4
Views: 367

Re: Name the compound

This kind of confused me too, I hope I did it right! If not, can someone let us know?
by Mimi Lec 2H
Tue Feb 28, 2017 1:32 am
Forum: General Rate Laws
Topic: 1.5 Order Rxn?
Replies: 1
Views: 420

Re: 1.5 Order Rxn?

On my quiz 2, one of them was a half order reaction, so I wouldn't rule anything out to be honest!
by Mimi Lec 2H
Sat Feb 25, 2017 6:31 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Heterogeneous Catalysts [ENDORSED]
Replies: 1
Views: 225

Re: Heterogeneous Catalysts [ENDORSED]

Hi Jasmine, A heterogeneous catalyst is a catalyst (a substance that increases the rate of a reaction without being consumed in the reaction) that is in a different phase from the reactants. So basically, if all the reactants of an equation are in the gas phase and a catalyst that is present is a so...
by Mimi Lec 2H
Tue Feb 21, 2017 11:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 14953

Re: Quiz 2 Winter 2017

This might be dumb question, but could someone quickly explain the difference between the reaction rate and the rate constant? Reaction rate is defined as the change in concentration of one of the reactants or products divided by the time interval over which the change takes place. The rate constan...
by Mimi Lec 2H
Sun Feb 12, 2017 8:19 pm
Forum: Administrative Questions and Class Announcements
Topic: 14C
Replies: 4
Views: 421

Re: 14C

I think that was only specific to Lavelle's class :( I'm bummed about it, I have a very late enrollment time so I will probably just have to defer it till fall quarter
by Mimi Lec 2H
Mon Feb 06, 2017 11:46 am
Forum: Student Social/Study Group
Topic: Quiz 1 Review
Replies: 4
Views: 476

Re: Quiz 1 Review

are you guys also interested in a midterm review? I would love to study with a big group!
by Mimi Lec 2H
Wed Jan 25, 2017 5:54 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Quiz 1 Prep #5
Replies: 5
Views: 979

Re: Quiz 1 Prep #5

I'm almost positive it's a typo and there has to be a coefficient of 2 for NH3. Without it, the reaction we are trying to find the standard enthalpy for is unbalanced. N2H4(ℓ) + H2(g) → NH3(g) : the reactant side has 2 nitrogen, 6 hydrogen and the product side has 1 nitrogen, 3 hydrogen, so there sh...
by Mimi Lec 2H
Wed Jan 25, 2017 5:37 pm
Forum: Student Social/Study Group
Topic: Quiz 1 Review
Replies: 4
Views: 476

Quiz 1 Review

Hi guys!
if anyone is interested in having a review session before Quiz 1 next week please let me know! I live in Sunset Village but I'm down to meet anywhere or even rent a pod/room at YRL!
by Mimi Lec 2H
Sun Jan 15, 2017 8:03 pm
Forum: Administrative Questions and Class Announcements
Topic: 14A to 14B Changes in Chem Community
Replies: 2
Views: 293

Re: 14A to 14B Changes in Chem Community

^ Just change your username to fit your new 14B discussion and to post each week, a week is defined Sunday-Sunday!
by Mimi Lec 2H
Sat Dec 03, 2016 1:44 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Weak Acids and Bases
Replies: 2
Views: 273

Re: Weak Acids and Bases

Because we know it is a weak acid/base, we know that Ka is very small, so we can approximate, and basically set that x equal to 0. I think the rule is if the given Ka is smaller than 10^-4, you can safely approximate.
by Mimi Lec 2H
Sat Dec 03, 2016 1:36 pm
Forum: Hybridization
Topic: Hybridized Orbitals with d
Replies: 1
Views: 192

Re: Hybridized Orbitals with d

There isn't a difference between sp^3d and dsp^3. I think it's usually written dsp^3 because d orbitals are lower in energy. It's like when writing the electron configurations: 3d10 4s2 etc.
by Mimi Lec 2H
Sat Dec 03, 2016 1:34 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 1
Views: 254

Re: Electron Affinity

I read that the first Electron Affinity for Oxygen is negative because forming the O- ion actually releases energy, however, when forming O2-, it requires energy because you are forcing an electron into an already negative ion, so it will not go in willingly and needs an input of energy. This is why...
by Mimi Lec 2H
Sat Dec 03, 2016 10:51 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs. Nonpolar
Replies: 1
Views: 288

Re: Polar vs. Nonpolar

I was wondering this as well, I don't understand why the book has Bromine triflouride listed under AX3 is stead of AX3E2 :/ Shouldn't they both be t-shaped and polar?
by Mimi Lec 2H
Tue Nov 22, 2016 3:46 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Higher/lower energy in a MO diagram?
Replies: 4
Views: 570

Re: Higher/lower energy in a MO diagram?

If you look up the molecular orbital diagram for NO-, you can see just about how much lower the more electronegative atom is drawn (in this case, oxygen)
by Mimi Lec 2H
Wed Nov 16, 2016 12:28 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Identifying Polydentates? [ENDORSED]
Replies: 8
Views: 911

Re: Identifying Polydentates? [ENDORSED]

So can you determine it by the number of atoms with lone pairs?
by Mimi Lec 2H
Mon Nov 14, 2016 10:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Significant Figures [ENDORSED]
Replies: 3
Views: 482

Re: Significant Figures [ENDORSED]

I think in lecture today when doing equilibrium equations, the slide said in parentheses to ignore sig figs during one of the problems
by Mimi Lec 2H
Mon Nov 14, 2016 10:14 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Compound Naming
Replies: 1
Views: 268

Re: Coordination Compound Naming

My course reader says that they will accept both? And I think memorizing the latin stems would be helpful. I think Iron (Fe) will be the most common one.
by Mimi Lec 2H
Mon Nov 14, 2016 10:10 pm
Forum: Naming
Topic: Rules for Writing Formula [ENDORSED]
Replies: 1
Views: 309

Re: Rules for Writing Formula [ENDORSED]

Toolbox 17.1 in the book (page 741) has all of the rules listed and it's really helpful! Ligands are written in alphabetical order, by actual name, not symbol, also ignoring the Greek prefix that indicates the number of each one present. Step 8 states, "The name of a coordination compound (as d...
by Mimi Lec 2H
Mon Nov 14, 2016 10:01 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Identifying Polydentates? [ENDORSED]
Replies: 8
Views: 911

Identifying Polydentates? [ENDORSED]

I'm having trouble with the homework problem 17.33 where you're given some ligands and are told to identify which ones are mono/bi/polydentates. I know that polydentate signifies that the ligand can attach to more than one binding site simultaneously, but identifying them is a little confusing for m...
by Mimi Lec 2H
Mon Nov 14, 2016 9:53 pm
Forum: Student Social/Study Group
Topic: Help with Coordination Compounds?
Replies: 6
Views: 886

Re: Help with Coordination Compounds?

Adiba_Chowdhury_1E wrote:How do you exactly find out if the complex has an overall negative or positive charge?


Adiba, I'm not 100% sure if this is correct but with the problems in the book, it seems that you have to find the individual charge of each ligand and of the central metal and add them up?
by Mimi Lec 2H
Mon Nov 14, 2016 9:52 pm
Forum: Student Social/Study Group
Topic: Help with Coordination Compounds?
Replies: 6
Views: 886

Re: Help with Coordination Compounds?

Thanks so much!
by Mimi Lec 2H
Fri Nov 11, 2016 11:47 pm
Forum: Student Social/Study Group
Topic: Help with Coordination Compounds?
Replies: 6
Views: 886

Help with Coordination Compounds?

hey guys! I've been studying for quiz 3 and found that coordination compounds are tripping me up a little. I was wondering if this weekend anyone would like to meet up and hopefully break them down for me a little simpler? Or if anyone has any good videos explaining them, that would be extremely hel...
by Mimi Lec 2H
Mon Oct 31, 2016 9:15 pm
Forum: Student Social/Study Group
Topic: MIDTERM REVIEW IN SUNSET VILLAGE
Replies: 2
Views: 544

MIDTERM REVIEW IN SUNSET VILLAGE

hey guys!
Tomorrow my friends from C1 are going to meet in the lounge to review for the midterm! Feel free to drop by! We'll be there after 8 pm! :)
by Mimi Lec 2H
Mon Oct 17, 2016 9:49 pm
Forum: Student Social/Study Group
Topic: Sunset Village Study Group
Replies: 17
Views: 1448

Re: Sunset Village Study Group

hey guys, heres the link for the groupme!
https://app.groupme.com/join_group/25921542/EgBvC0.
by Mimi Lec 2H
Thu Oct 13, 2016 11:46 am
Forum: Student Social/Study Group
Topic: Sunset Village Study Group Take 2
Replies: 1
Views: 502

Sunset Village Study Group Take 2

hi friends! I previously made a post on here about a study group for all of sunset village (other buildings welcome of course!) and figured it would just be easier to have a groupme chat! (Just download the app) Here is the link to join: https://app.groupme.com/join_group/25921542/EgBvC0. I'm hoping...
by Mimi Lec 2H
Thu Oct 13, 2016 11:29 am
Forum: Student Social/Study Group
Topic: Sunset Village Study Group
Replies: 17
Views: 1448

Re: Sunset Village Study Group

hey!
to everyone interested, just text me, and we can make a group chat!
I wanted to meet this weekend to kind of debrief everything from lecture this week!
by Mimi Lec 2H
Thu Sep 29, 2016 5:00 pm
Forum: Student Social/Study Group
Topic: Sunset Village Study Group
Replies: 17
Views: 1448

Sunset Village Study Group

Hey guys! I live in Courtside in the C4 building and wanted to know if anyone in all of sunset was interested in a study group! We could all meet at the end of the week to review and go over problems and study for the quizzes! I'd love to have a facebook group or iMessage so just let me know! 760529...

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