Search found 29 matches
- Sun Jun 10, 2018 11:58 pm
- Forum: Sigma & Pi Bonds
- Topic: pi and sigma bonds
- Replies: 2
- Views: 488
pi and sigma bonds
Which is stronger/harder to break: sigma or pi bonds?
- Sun Jun 10, 2018 11:56 pm
- Forum: Sigma & Pi Bonds
- Topic: four bonds
- Replies: 3
- Views: 652
four bonds
How many sigma and pi bonds are present in a molecule with 4 bonds??
- Sun Jun 10, 2018 11:55 pm
- Forum: Electronegativity
- Topic: electronegativity chart
- Replies: 11
- Views: 1873
Re: electronegativity chart
No, he will probably provide us with one on the exam if we even need one. It's important to know the general trend is anything and that Fl is the most electronegative atom.
- Sun Jun 10, 2018 11:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: final [ENDORSED]
- Replies: 1
- Views: 275
final [ENDORSED]
We're not expected to know the MO theory right? i know he mentioned it briefly in class...
- Sun Jun 10, 2018 11:51 pm
- Forum: Conjugate Acids & Bases
- Topic: Acids and Bases
- Replies: 2
- Views: 407
Re: Acids and Bases
Whatt exactly do you mean by split? i know that strong acids tend to disassociate in water completely.
- Sun Jun 10, 2018 11:49 pm
- Forum: Hybridization
- Topic: Chapter 4 [ENDORSED]
- Replies: 4
- Views: 606
Re: Chapter 4 [ENDORSED]
This has to do with cis and trans configuration. If the dipole bonds are on the same side of the molecule [cis], then its polar. If the bonds are on opposite sides of the molecule [trans] , it's nonpolar because they cancel!
- Sun Jun 10, 2018 11:48 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Help on HW#4.9 [ENDORSED]
- Replies: 3
- Views: 492
Re: Help on HW#4.9 [ENDORSED]
Yes, since iodine is beyond the 3p orbital it can and will form an expanded octet.
- Sun Jun 10, 2018 11:46 pm
- Forum: Hybridization
- Topic: sp^3d or dsp^3
- Replies: 6
- Views: 820
Re: sp^3d or dsp^3
I had the same question last week. The order doesn't matter, but I believe writing the d at the end is preferred.
- Sun Jun 10, 2018 11:45 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Final [ENDORSED]
- Replies: 5
- Views: 619
Re: Final [ENDORSED]
My TA said they will be as specific a possible on those types of questions. You can probably just write bent unless otherwise specified.
- Sun Jun 10, 2018 11:43 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent/angular [ENDORSED]
- Replies: 5
- Views: 717
Re: Bent/angular [ENDORSED]
Yes, it is the same thing and I had the same confusion.
- Sun Jun 10, 2018 11:42 pm
- Forum: SI Units, Unit Conversions
- Topic: Sig Figs for Final
- Replies: 8
- Views: 1218
Re: Sig Figs for Final
Yes, we are expected o know significant digits since the midterm.
- Sun Jun 10, 2018 11:39 pm
- Forum: Polyprotic Acids & Bases
- Topic: Coordination number [ENDORSED]
- Replies: 3
- Views: 1205
Re: Coordination number [ENDORSED]
It is also basically the same as a bond number.
- Sun Jun 10, 2018 11:36 pm
- Forum: Air Pollution & Acid Rain
- Topic: ACID RAIN
- Replies: 5
- Views: 839
Re: ACID RAIN
One of the ways acid rain is harmful is due to its higher acidity. Its lower pH values would greatly harm the pH levels of marine life as well as terrestrial soil, causing lots of damage.
- Sun Jun 10, 2018 11:33 pm
- Forum: Lewis Acids & Bases
- Topic: pH
- Replies: 3
- Views: 644
Re: pH
Yeah, its one of the learning objectives.
- Sun Jun 10, 2018 11:21 pm
- Forum: Lewis Acids & Bases
- Topic: Strong Acid
- Replies: 8
- Views: 1173
Re: Strong Acid
Because it completely dissasociates in water.
- Sun Jun 10, 2018 11:20 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3592634
Re: Post All Chemistry Jokes Here
A proton walks into a bar. He's visibly depressed and disheveled. "Why the long face?" the bartender asks. The proton sighs. "I found out my wife has been unfaithful," he replies. "How do know?" asks the bartender. "Well, you see, I've always been faithful to my wi...
- Wed May 30, 2018 8:27 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 4.13 D
- Replies: 1
- Views: 226
4.13 D
On question 4.13 D, shouldn't the middle N have one lone pair because this has the lowest formal charge? Then why do the Ns have double or triple bonds?
- Sun May 27, 2018 10:58 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR confusion
- Replies: 8
- Views: 1312
Re: VSEPR confusion
Lewis structure simply gives us the basics of valence electrons, ie how many pairs there are, how many single double or triple bonds, how many electrons in general. VSEPR actually tells you the angle of the shapes in a 3-D perspective. All electrons wish to be as far away from each other as possible...
- Sun May 27, 2018 10:50 pm
- Forum: Octet Exceptions
- Topic: Expanded Octet
- Replies: 2
- Views: 574
Re: Expanded Octet
There is an expanded orbital due to the fact that elements on this horizontal group have access to an extra ten orbitals that are other wise used up on other groups.
- Sun May 27, 2018 10:48 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: PF3 molecular geometry
- Replies: 2
- Views: 1449
Re: PF3 molecular geometry
P would have one lone pair due to the fact that this has a formal charge of 0. It would also affect VSEPR shape, as it lone pairs have lower pull. Think of the example in class when he pulled the little ball and only the stick was sticking out.
- Sun May 13, 2018 9:10 pm
- Forum: Lewis Structures
- Topic: Lewis Structure [ENDORSED]
- Replies: 3
- Views: 444
Re: Lewis Structure [ENDORSED]
Atoms that fall on the 3P orbital would have a higher tendency to form double and triple bonds due to the fact that these atoms are the exceptions to the octet rule, and may be able to hold up to an extra 20 electrons.
- Sun May 13, 2018 6:47 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge purpose
- Replies: 40
- Views: 7175
Re: Formal charge purpose
If having a formal charge of 0 means that an atom is most stable, then why do atoms like chlorine tend to have a negative charge when isolated (ie Cl-)?
- Sun May 13, 2018 6:43 pm
- Forum: Octet Exceptions
- Topic: Concept of Exceptions
- Replies: 4
- Views: 698
Re: Concept of Exceptions
Elements on the third row on the p-orbital have higher energy than 3-D electrons. Since third row electrons don't have any electrons on the 3D orbital, valence electrons can fill in the empty row.
- Sun May 06, 2018 3:07 pm
- Forum: Einstein Equation
- Topic: Question 1.25b
- Replies: 2
- Views: 482
Question 1.25b
What is the specific equation for finding the energy of mass for this one problem why do we have to multiply the energy of the the sodium light with the moles and avogrado"s number?
- Sat May 05, 2018 11:51 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration Exceptions
- Replies: 3
- Views: 421
Electron Configuration Exceptions
How many configuration exceptions are we supposed to memorize on top of Chromium and Copper? Also, is it true that all exceptions to the rule are below Cr and Cu on the periodic table?
- Wed May 02, 2018 9:07 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Question 2.13
- Replies: 2
- Views: 353
Question 2.13
Are we expected to know orientations and descriptions of the "P sub x/y/z" orbitals beyond the fact that their lobes are oriented along their respective axes?
- Sun Apr 29, 2018 8:17 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Why does 4s fill up before 3d?
- Replies: 4
- Views: 482
Re: Why does 4s fill up before 3d?
Is there any particular reason as to why orbitals are named the way they are, or where these letters chosen at random?
- Sun Apr 29, 2018 8:07 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbital shell in Hydrogen
- Replies: 2
- Views: 156
Re: Orbital shell in Hydrogen
Since there is only one electron in a typical Hydrogen atom, it would interact with the nucleus at a constant rate.
- Sun Apr 29, 2018 7:58 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Lyman Series
- Replies: 4
- Views: 303
Re: Lyman Series
I believe its UV light.