Search found 31 matches
- Sat Jun 16, 2018 4:21 pm
- Forum: Ionic & Covalent Bonds
- Topic: ionic character
- Replies: 11
- Views: 2159
Re: ionic character
what is the difference between something being ionic or dipole? I found this explanation: "An ion-dipole force is a force between an ion and a polar molecule. A hydrogen bond is a dipole-dipole force and is an attraction between a slightly positive hydrogen on one molecule and a slightly negat...
- Sat Jun 16, 2018 4:19 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3903718
Re: Post All Chemistry Jokes Here
What kind of dogs do chemists have?
Laboratory retrievers
Laboratory retrievers
- Thu Jun 14, 2018 7:38 pm
- Forum: Properties of Electrons
- Topic: threshold energy
- Replies: 2
- Views: 511
Re: threshold energy
If the energy of the photon is not more than or equal to the threshold energy, or energy required to eject electrons from the metal surface, than it isn't possible for the beam hitting the metal to result in electron ejection.
- Thu Jun 14, 2018 7:36 pm
- Forum: Air Pollution & Acid Rain
- Topic: Acid Rain
- Replies: 24
- Views: 4029
Re: Acid Rain
This value is considered neutral—neither acidic or basic. Normal, clean rain has a pH value of between 5.0 and 5.5, which is slightly acidic. However, when rain combines with sulfur dioxide or nitrogen oxides—produced from power plants and automobiles—the rain becomes much more acidic.
- Thu Jun 14, 2018 7:34 pm
- Forum: Lewis Structures
- Topic: Octet Rule
- Replies: 5
- Views: 861
Re: Octet Rule
Yes!! All atoms want eight valence electrons. I think the only exceptions are period 3 and below because they can have expanded octets.
- Thu Jun 14, 2018 7:32 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3903718
Re: Post All Chemistry Jokes Here
Helium walks into a bar,
The bar tender says "We don't serve noble gasses in here."
Helium doesn't react.
The bar tender says "We don't serve noble gasses in here."
Helium doesn't react.
- Thu Jun 14, 2018 7:31 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge Exponent
- Replies: 5
- Views: 1050
Re: Formal Charge Exponent
This is what I found:
In chemistry, a formal charge (FC) is the charge assigned to an atom in a molecule, assuming that electrons in all chemical bonds are shared equally between atoms, regardless of relative electronegativity.
In chemistry, a formal charge (FC) is the charge assigned to an atom in a molecule, assuming that electrons in all chemical bonds are shared equally between atoms, regardless of relative electronegativity.
- Thu Jun 14, 2018 7:30 pm
- Forum: Lewis Structures
- Topic: lewis structure
- Replies: 10
- Views: 1084
Re: lewis structure
It is usually the most electronegative, C is one of the more common ones!!
- Thu Jun 14, 2018 7:27 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3903718
Re: Post All Chemistry Jokes Here
Q: What do you do with a sick chemist?
A: If you can't helium, and you can't curium, then you might as well barium.
A: If you can't helium, and you can't curium, then you might as well barium.
- Thu Jun 14, 2018 7:26 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3903718
Re: Post All Chemistry Jokes Here
Have you heard the one about a chemist who was reading a book about helium?
He just couldn't put it down.
He just couldn't put it down.
- Sun Jun 10, 2018 1:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sunday Step-Up Session
- Replies: 2
- Views: 522
Re: Sunday Step-Up Session
I think in his email he listed the ones still going on this week, I'm almost positive it still is and also there is a review session this afternoon!
- Thu Jun 07, 2018 1:37 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3903718
Re: Post All Chemistry Jokes Here
A proton and neuron are walking down the street.
Proton: Wait, I lost an electron. Will you help me find it?
Neuron: Are you sure?
Proton: Yeah, I'm positive!
Proton: Wait, I lost an electron. Will you help me find it?
Neuron: Are you sure?
Proton: Yeah, I'm positive!
- Tue Jun 05, 2018 11:35 am
- Forum: Student Social/Study Group
- Topic: Review Sessions this weekend
- Replies: 1
- Views: 345
Review Sessions this weekend
Hi!! I am out of state this weekend for my little sister's graduation. Sadly, I knew I would be missing review sessions. I was wondering if there would be worksheets or note posted anywhere from each review session that specifically covers material from one to multiple chapters/topics. Thank you!! A...
- Sat Jun 02, 2018 5:51 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3903718
Re: Post All Chemistry Jokes Here
Once, I told a chemistry joke...
there was no reaction
there was no reaction
- Sat Jun 02, 2018 5:46 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination compounds
- Replies: 2
- Views: 489
Re: Coordination compounds
I found this answer: A coordination complex is the product of a Lewis acid-base reaction in which neutral molecules or anions (called ligands) bond to a central metal atom (or ion) by coordinate covalent bonds. Ligands are Lewis bases - they contain at least one pair of electrons to donate to a meta...
- Sun May 27, 2018 3:08 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 2
- Views: 402
Re: Hybridization
This video might help: https://www.youtube.com/watch?v=4xl0BD-tMeA I found this online: "In chemistry, orbital hybridisation (or hybridization) is the concept of mixing atomic orbitals into new hybrid orbitals (with different energies, shapes, etc., than the component atomic orbitals) suitable ...
- Sun May 27, 2018 3:04 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3903718
Re: Post All Chemistry Jokes Here
That was sodium funny
I slapped my neon that one!
I slapped my neon that one!
- Fri May 18, 2018 5:57 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3903718
Re: Post All Chemistry Jokes Here
Q: If H2O is the formula for water, what is the formula for ice?
A: H2O cubed.
A: H2O cubed.
- Fri May 18, 2018 5:55 pm
- Forum: Lewis Structures
- Topic: Charge on Molecule [ENDORSED]
- Replies: 4
- Views: 551
Re: Charge on Molecule [ENDORSED]
I think it would just be dependent on the outer shells of the atoms involved, so the atom left with one unpaired electron as opposed to other atoms involved with all valence electrons?
- Fri May 11, 2018 2:07 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3903718
Re: Post All Chemistry Jokes Here
A photon checks into a hotel and they ask if he has any luggage.
"No, I'm traveling light."
"No, I'm traveling light."
- Thu May 03, 2018 4:06 pm
- Forum: Ionic & Covalent Bonds
- Topic: Octet
- Replies: 7
- Views: 1027
Re: Octet
An atom can have up to eight electrons in its outermost shell. Noble gases (Helium, Neon, Argon, etc) have full shells; or eight valence electrons, and because they have the maximum possible amount of valence electrons in their outermost shells, they are the most stable atoms. To become stable, an a...
- Sat Apr 28, 2018 2:41 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3903718
Re: Post All Chemistry Jokes Here
I tell bad chemistry jokes because all the good ones Argon :(
- Fri Apr 27, 2018 9:32 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Coefficients in electron configurations [ENDORSED]
- Replies: 4
- Views: 3886
Re: Coefficients in electron configurations [ENDORSED]
This is the answer I found: The atomic number for Calcium is 20, so you have 20 electrons to worry about for the configuration. 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 But, for a shorter notation, you can use Argon(atomic number=18), a noble gas with a full outer shell, and add the 4s^2 to bring you to Calcium.
- Sun Apr 22, 2018 7:04 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3903718
Re: Post All Chemistry Jokes Here
Why did the white bear dissolve in water?
Because it was polar
Because it was polar
- Sun Apr 22, 2018 7:02 pm
- Forum: General Science Questions
- Topic: Tools for remembering equations
- Replies: 5
- Views: 926
Tools for remembering equations
The other day, a girl in a study session mentioned that she new a song that applied to the material we're learning, something with the equations I believe. Does anyone know any! I'm curious to see if there is something helpful to memorize that is also cute and fun
- Sat Apr 21, 2018 8:25 pm
- Forum: Student Social/Study Group
- Topic: Study Group
- Replies: 10
- Views: 1644
Re: Study Group
Hannah, are you able to email me the link as well? I'm having some difficulty with it.
sollieclrk744@gmail.com. Thank you!!
sollieclrk744@gmail.com. Thank you!!
- Fri Apr 13, 2018 7:57 pm
- Forum: Properties of Light
- Topic: avogadro's number
- Replies: 5
- Views: 744
Re: avogadro's number
I found this but I'm not sure if it is enough to answer your question "The initial energy state is 1 (the only energy state the hydrogen atom can have) and the inverse of 1 is 1. The difference between 1 and 0 is 1. ... This is the first ionization energy of the hydrogen atom. Multiply the ioni...
- Fri Apr 13, 2018 7:48 pm
- Forum: Student Social/Study Group
- Topic: Study Group
- Replies: 8
- Views: 1028
Study Group
The last 14A class did a weekly study group that met on the hill, is anyone interested in setting up a few for this quarter? i know that we have plenty of step-ups and workshops as well, but this might also be helpful!
- Fri Apr 13, 2018 7:45 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3903718
Re: Post All Chemistry Jokes Here
If Avogadro calls, tell him to leave his number
- Fri Apr 13, 2018 7:42 pm
- Forum: Significant Figures
- Topic: Significant figures
- Replies: 4
- Views: 522
Re: Significant figures
When will we be going over sig figs?
- Fri Apr 13, 2018 7:38 pm
- Forum: Properties of Light
- Topic: Data to memorize for this chapter [ENDORSED]
- Replies: 2
- Views: 276
Re: Data to memorize for this chapter [ENDORSED]
On his second outline on the website, he discusses what we should know after learning this next material! https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14A/Chem14A_Outline2_The_Quantum_World.pdf For example: "Name and explain the relationship of each of the four s-, p-, and d-or...