Search found 24 matches

by Ruiz Samantha 2C
Sun Mar 19, 2017 2:27 am
Forum: Balancing Redox Reactions
Topic: Winter 2013 Final Q4
Replies: 3
Views: 365

Re: Winter 2013 Final Q4

I also have problems with this question :c
by Ruiz Samantha 2C
Mon Mar 13, 2017 8:29 pm
Forum: *Alkanes
Topic: Naming [ENDORSED]
Replies: 92
Views: 8333

Re: Naming [ENDORSED]

I'm still a little confused on the difference between IUPAC and common names. Can someone please explain.
by Ruiz Samantha 2C
Tue Mar 07, 2017 4:50 pm
Forum: *Electrophiles
Topic: Halogens
Replies: 4
Views: 709

Re: Halogens

F by itself would be an electrophile because it needs an extra electron to be complete. F- however, is a nucleophile and it will be more attracted to a positively charged element.
by Ruiz Samantha 2C
Wed Mar 01, 2017 7:11 pm
Forum: *Alkanes
Topic: Common Names
Replies: 2
Views: 277

Re: Common Names

I would imagine that we would need to write the common name if asked for, but I'm not entirely sure.
by Ruiz Samantha 2C
Fri Feb 24, 2017 10:28 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Homework 15.19 c & d
Replies: 3
Views: 393

Re: Homework 15.19 c & d

You could leave your units as (mmol/L*s) or (mmol/L) unless the question specifically asks you to use a certain unit then you would have to convert. You just have to be consistent with your units and you'll be fine.
by Ruiz Samantha 2C
Fri Feb 10, 2017 5:01 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Molecular Entropy
Replies: 3
Views: 448

Re: Molecular Entropy

When comparing which molecules have greater entropy, always look out for:
-Which molecule has the greatest molecular structure
-Gas>liquid>solid states
-Lowest atm because lower pressure means more disorder
by Ruiz Samantha 2C
Wed Feb 01, 2017 1:27 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Resources
Replies: 3
Views: 317

Re: Resources

Try going to any of the TA's office hours. They are really helpful. After you understood most of the material, try testing yourself by rewriting them on another sheet of paper. That's what I do and I find that helpful as well.
by Ruiz Samantha 2C
Sat Jan 28, 2017 4:25 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Change in entropy= q/T [ENDORSED]
Replies: 3
Views: 386

Change in entropy= q/T [ENDORSED]

According to the equation, does entropy increase when temperature increases? Or does entropy decrease when temperature increases?
by Ruiz Samantha 2C
Sun Jan 22, 2017 12:11 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Examples of Isolated systems [ENDORSED]
Replies: 3
Views: 910

Re: Examples of Isolated systems [ENDORSED]

Quick question, can closed system exchange heat or matter only?
by Ruiz Samantha 2C
Thu Jan 12, 2017 12:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Posts
Replies: 23
Views: 2587

Re: Posts

Hello everyone, I'm new to the Chemistry Community and I have a few questions about the layout after reading a tutorial. 1. Is this the right place for me to post my questions for Chem 14B Winter 2017? 2. Is there any indication that the professor or TA has seen my post/ question? 3. How can I add ...
by Ruiz Samantha 2C
Fri Dec 02, 2016 4:42 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Table
Replies: 3
Views: 451

Re: ICE Table

https://www.youtube.com/watch?v=DP-vWN1yXrY

I found this to be very helpful! Hope it also helps those that are struggling.
by Ruiz Samantha 2C
Fri Dec 02, 2016 4:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Table
Replies: 3
Views: 451

Re: ICE Table

Ara Yazaryan 1H wrote:The table is simply used to help determine the change in moles of reactants and products before and after a reaction takes place. Thus you would use it in acid base reactions, titrations, etc.

Hope that helps :)


Thank you!
by Ruiz Samantha 2C
Fri Dec 02, 2016 4:23 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: About writing molecular orbitals
Replies: 3
Views: 423

Re: About writing molecular orbitals

I believe professor Lavelle said we could use either notation.
by Ruiz Samantha 2C
Thu Dec 01, 2016 6:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Table
Replies: 3
Views: 451

ICE Table

How do i know when i have to use an ICE table? Can someone help me understand what this table does?
by Ruiz Samantha 2C
Fri Nov 25, 2016 5:17 pm
Forum: Student Social/Study Group
Topic: Final Review
Replies: 2
Views: 537

Re: Final Review

You should work on questions from acids and bases on the textbook and then work on past Final exams that are in the back of the course reader.
by Ruiz Samantha 2C
Fri Nov 18, 2016 4:43 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Water in K calculation
Replies: 3
Views: 369

Re: Water in K calculation

Correct. If the equation says that H2O is a (g) gas then we include it in K. Anything that is a solid or a liquid we do not include in K. We only include gases and aqueous solutions.
by Ruiz Samantha 2C
Fri Nov 11, 2016 11:24 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: d-block electron configurations
Replies: 2
Views: 552

Re: d-block electron configurations

So for example if they gave us: Ti2+
I would write the noble gas electron configuration like this [Ar] 3d2 4s2
And then just take away 2 e- from the last number you wrote 4s2
-Your noble gas electron configuration for Ti2+ then would be: [Ar] 3d2
by Ruiz Samantha 2C
Thu Nov 03, 2016 12:20 am
Forum: Sigma & Pi Bonds
Topic: Pi Bonds
Replies: 4
Views: 583

Re: Pi Bonds

In question 8 from midterm 2014: C and O have pi bonds because Carbon creates a double bond with Oxygen which means that 1 of those bonds is a sigma and the other is a pi. Therefore the notation is pi(C2p, O2p) because there is a pi corresponding to C and O.
by Ruiz Samantha 2C
Wed Oct 26, 2016 6:20 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Characters
Replies: 5
Views: 676

Re: Ionic Characters

Fluorine is the most electronegative with 4.0. An easy way to remember this is by knowing that F will always be 4.0, subtracting .5 on the left it will be Oxygen with (3.5), subtract .5 on the left and it will be Nitrogen (3.0), subtract .5 and it will be followed by Carbon with (2.5), subtract .5 a...
by Ruiz Samantha 2C
Tue Oct 18, 2016 9:18 pm
Forum: Trends in The Periodic Table
Topic: Cation Vs. Anion [ENDORSED]
Replies: 6
Views: 559

Re: Cation Vs. Anion [ENDORSED]

(Cations) Group 1 elements will have a +1, group 2 elements will have +2, and group 3 as +3, group 4 as +4 because they are losing an electron. (Anions) Group 15 as -3, group 16 as -2 and group 17 as -1 because they are gaining 1 electron. Group 18, the noble gases are stable so they do not have a ...
by Ruiz Samantha 2C
Tue Oct 18, 2016 5:44 pm
Forum: Trends in The Periodic Table
Topic: Cation Vs. Anion [ENDORSED]
Replies: 6
Views: 559

Re: Cation Vs. Anion [ENDORSED]

(Cations) Group 1 elements will have a +1, group 2 elements will have +2, and group 3 as +3, group 4 as +4 because they are losing an electron. (Anions) Group 15 as -3, group 16 as -2 and group 17 as -1 because they are gaining 1 electron. Group 18, the noble gases are stable so they do not have a +...
by Ruiz Samantha 2C
Mon Oct 10, 2016 6:01 pm
Forum: Empirical & Molecular Formulas
Topic: Writing Chemical Formulas
Replies: 1
Views: 275

Re: Writing Chemical Formulas

Yes, there is a something called the Hill System. It means that if you have carbon in the equation, that will be written first and then hydrogen. If there is no carbon or hydrogen present, then you would just write the equation with the elements in alphabetical order.
by Ruiz Samantha 2C
Thu Oct 06, 2016 5:01 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Question for Thought [ENDORSED]
Replies: 2
Views: 401

Re: Question for Thought [ENDORSED]

I am not sure how complex orbitals can get but I believe there is only S,P,D and F orbitals in the periodic table.
I learned this in the summer:

1s
2s 2p
3s 3p 3d
4s 4p 4d 4f..
by Ruiz Samantha 2C
Wed Sep 28, 2016 10:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Where to begin? [ENDORSED]
Replies: 8
Views: 972

Re: Where to begin? [ENDORSED]

After watching some of Dr. Lavelle's videos, try working on some problems from the Fundamentals section of the textbook (odd numbers). That way you can compare your process with the process and answers that are shown in the solutions manual.

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