Search found 32 matches
- Mon Dec 03, 2018 4:36 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Hydronium
- Replies: 4
- Views: 457
Re: Hydronium
Both essentially the same thing but when working in an aqueous solution, it is easier the refer as H30+ because water is the proton acceptor.
- Mon Dec 03, 2018 4:28 pm
- Forum: Conjugate Acids & Bases
- Topic: Conjugate of oxoacid
- Replies: 3
- Views: 354
Re: Conjugate of oxoacid
I know these are not the same acids but this is a good explanation Lavelle gave in 2014: HOCl vs HOI --> To analyze the acidity of this pair you [censored] the polarizing power of the conjugate base (eg. -OCl and -OI). The more electronegative species (-OCl) will polarize ( pull charge towards it) t...
- Mon Dec 03, 2018 4:20 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: pOH
- Replies: 5
- Views: 883
Re: pOH
We do need to be able to do both. In all the homework problems (or most) you had to find both. But they are pretty easy and depending on which compounds we are working with it is a useful skill.
- Mon Dec 03, 2018 4:18 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Relative Acidity
- Replies: 1
- Views: 238
Re: Relative Acidity
A stronger acid will disassociate more and because KA is the ratio of product concentrations over reactant concentrations, the more products, will increase KA. Then since pKA is the negative log of KA the values will decrease and be more acidic.
- Mon Dec 03, 2018 4:15 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: As2O3 and Bi2O3
- Replies: 1
- Views: 245
Re: As2O3 and Bi2O3
Check this out; it is a good explanation:
viewtopic.php?f=55&t=610
viewtopic.php?f=55&t=610
- Mon Dec 03, 2018 3:58 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Tetrahedral vs. square-planar
- Replies: 6
- Views: 1757
Re: Tetrahedral vs. square-planar
The square planar has six areas of electron density surrounding the central atom: four of these are other bonded atoms and two are lone pairs. Tetrahedral will have angles of 109.5 where the square planar will have angles of 90.
- Mon Dec 03, 2018 3:55 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Negative pH?
- Replies: 5
- Views: 515
Re: Negative pH?
Dr. Lavelle said there are such things as super acids and bases. The super bases can have pH values greater than 14 and super acids can have pH values below 0.
- Mon Dec 03, 2018 3:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Homework week 10
- Replies: 3
- Views: 403
Re: Homework week 10
YES OF COURSE
- Tue Nov 27, 2018 2:54 pm
- Forum: Hybridization
- Topic: 2F.13 7th Ed
- Replies: 4
- Views: 461
Re: 2F.13 7th Ed
There are three areas of electron concentration. Total valence electrons for CH2 is 6. Each hydrogen has one bond and there is one lone pair. The bent shape will give you an SP2 hybridization.
- Sun Nov 25, 2018 4:59 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: pi and sigma bonds
- Replies: 9
- Views: 1383
Re: pi and sigma bonds
If your pi bond refers to the p-p orbitals overlapping, then pi bond is weaker than sigma bond. Double bond is stronger than single bond because double bond consists of a pi bond and a sigma bond. Whereas sigma bond results from s-orbital overlap which has greater area of interaction and overlapping.
- Sun Nov 25, 2018 4:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 3
- Replies: 6
- Views: 555
Re: Test 3
Yes you will need to be able to draw and name the VSEPR models and shapes.
- Sun Nov 25, 2018 4:55 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shape
- Replies: 7
- Views: 683
Re: Molecular Shape
There are four bonded atoms and one lone pair. The angles of the bonded atoms are 90, 90>angle>180, and 180. Mostly the four bonded atoms are tetrahedral, but the lone pair pushes down the atoms.
- Sat Nov 10, 2018 9:11 pm
- Forum: Dipole Moments
- Topic: Hydrogen Bonds
- Replies: 20
- Views: 1444
Re: Hydrogen Bonds
Covalent bonds are stronger than hydrogen bonds, but the induced dipole interactions are weaker than the hydrogen bond.
- Sat Nov 10, 2018 9:09 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Drawing Lewis Structures with VSPER
- Replies: 5
- Views: 514
Re: Drawing Lewis Structures with VSPER
When it is telling you to draw the VSEPR structure, which I feel we will only be doing from now on, you must specify the bond length.
- Sun Nov 04, 2018 3:12 pm
- Forum: Resonance Structures
- Topic: Resonance Structures
- Replies: 2
- Views: 313
Re: Resonance Structures
First elements do not have a resonance, molecules do. Second, in nature molecules will go to the lowest energy state which involves (for our proposes) looking at formal charge.
- Sun Nov 04, 2018 3:06 pm
- Forum: Lewis Structures
- Topic: Lewis Structures
- Replies: 11
- Views: 993
Re: Lewis Structures
No^ because in nature the molecule can literally just turn and the elements would switch whether they are on the right or the left.
- Sun Nov 04, 2018 3:04 pm
- Forum: Trends in The Periodic Table
- Topic: Cation and Anion Size
- Replies: 3
- Views: 434
Re: Cation and Anion Size
The trend is based on the fact that the ratio of protons to electrons in the shell becomes greater. There are more protons than electrons, so the shell will not be able to expand as far with the greater pull.
- Sun Oct 28, 2018 10:58 am
- Forum: Ionic & Covalent Bonds
- Topic: Bond
- Replies: 9
- Views: 863
Re: Bond
I think they are possible (in a lab can be generated) but there are none naturally occurring, and like these people said^^definitely not for this class.
- Sun Oct 28, 2018 10:56 am
- Forum: Ionic & Covalent Bonds
- Topic: electronegativity and ionization energy [ENDORSED]
- Replies: 4
- Views: 553
Re: electronegativity and ionization energy [ENDORSED]
I visualize ionization energy is having a struggle with an atom to pull one of its electron away from it, where electronegativity is an atom pulling my own electrons away when we are linking up (if the other atom has a higher electronegativity).
- Sun Oct 28, 2018 10:54 am
- Forum: Ionic & Covalent Bonds
- Topic: Lowest Ionization Energy [ENDORSED]
- Replies: 7
- Views: 702
Re: Lowest Ionization Energy [ENDORSED]
For connection purposes: think of ionization energy as having a similar trend to electronegativity. The elements that pull electrons more towards themselves when bonding are the same atoms that it is difficult to remove an electron from.
- Sun Oct 21, 2018 12:16 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Electron configurations
- Replies: 2
- Views: 274
Re: Electron configurations
Starting the electron configuration at a noble gas is a shorthand, but in my own experience you become comfortable and memorize the structure. The noble gases are all P^6 so you can just count the rows down on the periodic table to determine. It's pretty simple, but there are some weird moments elec...
- Sat Oct 20, 2018 10:13 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Alternate names of n, l, ml, and ms
- Replies: 2
- Views: 1771
Re: Alternate names of n, l, ml, and ms
n=principle quantum number
l=angular momentum quantum number
ml=magnetic quantum number
ms=spin magnetic quantum number
l=angular momentum quantum number
ml=magnetic quantum number
ms=spin magnetic quantum number
- Fri Oct 19, 2018 11:58 am
- Forum: Properties of Light
- Topic: Do I have to memorize the spectrum?
- Replies: 20
- Views: 1565
Re: Do I have to memorize the spectrum?
You just need to know where light is visible. I do not believe that you will need to memorize every value, that'd be a little absurd.
- Tue Oct 16, 2018 1:48 pm
- Forum: Properties of Light
- Topic: Question 1B.7
- Replies: 2
- Views: 142
Question 1B.7
The question is about different aspects of sodium, but in the solutions guide it seems to have the energy per atom of sodium as a given. Will we be provided with such information on tests?
- Fri Oct 12, 2018 5:28 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: molar masses on the test
- Replies: 7
- Views: 886
Re: molar masses on the test
That reply is by Andrew Winer (4D).^^^
- Fri Oct 12, 2018 5:28 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: molar masses on the test
- Replies: 7
- Views: 886
Re: molar masses on the test
You will be provided a periodic table but will have to calculate molar masses on molecules.
- Fri Oct 12, 2018 5:27 pm
- Forum: DeBroglie Equation
- Topic: Negative Sign
- Replies: 4
- Views: 342
Re: Negative Sign
Because the electron is losing energy as it moves down energy levels. Photons will be emitted (Light will be visible).
-Andrew Winer 4D
-Andrew Winer 4D
- Fri Oct 12, 2018 5:23 pm
- Forum: Properties of Electrons
- Topic: Energy Levels
- Replies: 4
- Views: 570
Re: Energy Levels
That reply is by Andrew Winer^^
- Fri Oct 12, 2018 5:22 pm
- Forum: Properties of Electrons
- Topic: Energy Levels
- Replies: 4
- Views: 570
Re: Energy Levels
It has to do with the effective nuclear charge. Shielding also plays a factor. The shielding effect describes the balance between the pull of the protons on valence electrons and the repulsion forces from inner electrons. The effective nuclear charge is the net positive charge experienced by valence...
- Wed Oct 03, 2018 10:59 am
- Forum: Significant Figures
- Topic: Periodic Table Sig Figs
- Replies: 4
- Views: 1259
Re: Periodic Table Sig Figs
I would wait to round till you get to the final answer. Use the extended version for calculations but then correct at the end for sig figs.
- Wed Oct 03, 2018 10:56 am
- Forum: General Science Questions
- Topic: Turning in Homework
- Replies: 4
- Views: 474
Re: Turning in Homework
You turn the homework into your TA during discussion. I believe they return it the following week and definitely before any exam. Also the homework is graded for accuracy so make sure to check your answers in the solutions guide.
- Wed Oct 03, 2018 10:55 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Mole Definition
- Replies: 5
- Views: 688
Re: Mole Definition
This definition was just an example for one element. The atomic weights given on the periodic table are grams per one mole, so if you wanted to look at another element, let's use hydrogen, one mole would equal 1.001 grams of hydrogen.