Search found 42 matches
- Sun Jan 10, 2021 1:27 pm
- Forum: Student Social/Study Group
- Topic: Advice for someone who didn't take 14A with professor Lavelle
- Replies: 61
- Views: 3009
Re: Advice for someone who didn't take 14A with professor Lavelle
If you're someone who doesn't tend to well in exams, Lavelle's classes still give you an opportunity to get a good grade with all the points you get from the chemistry community and homework points so make sure you do those!
- Sun Jan 10, 2021 1:26 pm
- Forum: Student Social/Study Group
- Topic: How to relax
- Replies: 168
- Views: 25737
Re: How to relax
cooking is probably one of the biggest ways I relax
- Sun Jan 10, 2021 1:24 pm
- Forum: Student Social/Study Group
- Topic: New Year Resolutions?
- Replies: 54
- Views: 2932
Re: New Year Resolutions?
My only resolution for this year is to put myself out there more and to put myself in situations I wouldn't normally be comfortable in to improve my confidence.
- Sun Jan 10, 2021 1:22 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3611387
Re: Post All Chemistry Jokes Here
What kind of fish is made out of 2 sodium atoms?
2 Na
2 Na
- Sun Jan 10, 2021 1:21 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3611387
Re: Post All Chemistry Jokes Here
What is the chemical formula for "banana"?
BaNa2
BaNa2
- Tue Dec 15, 2020 2:16 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3611387
Re: Post All Chemistry Jokes Here
What is a chemist’s favorite holiday song?
Oh Chemist-TREE, oh Chemist-TREE!
Oh Chemist-TREE, oh Chemist-TREE!
- Tue Dec 15, 2020 2:14 am
- Forum: Student Social/Study Group
- Topic: Final Exam
- Replies: 49
- Views: 2701
Re: Final Exam
I felt really confident after midterm 2 and used the same study techniques but honestly the final was crazy :(
- Wed Dec 02, 2020 4:15 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3611387
Re: Post All Chemistry Jokes Here
Q: Why do you go to jail for throwing sodium chloride for somebody?
A: Because its a salt.
A: Because its a salt.
- Wed Dec 02, 2020 4:14 am
- Forum: Student Social/Study Group
- Topic: Big Sad: Midterm 2
- Replies: 86
- Views: 6329
Re: Big Sad: Midterm 2
I did much better on the second midterm than I did on the first and that could be because I changed my study habits slightly. I found that explaining each step of solving a particular problem made sure I actually understood the concept. Think about do practice problems like you're teaching someone h...
- Wed Dec 02, 2020 4:09 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination numbers and shapes
- Replies: 3
- Views: 351
Coordination numbers and shapes
How do you use the Coordination number of a compound o determine it's shape without drawing it out?
- Wed Dec 02, 2020 4:06 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Neutral ligands
- Replies: 4
- Views: 1548
Neutral ligands
Can someone explain what a neutral ligand is and some examples of it?
- Wed Dec 02, 2020 4:01 am
- Forum: Quantum Numbers and The H-Atom
- Topic: electrostatic potential energy
- Replies: 1
- Views: 339
Re: electrostatic potential energy
Electric potential energy is the energy that is needed to move a charge against an electric field. you need more energy to move a charge further in the electric field, but also more energy to move it through a stronger electric field. Gravitational potential energy and electric potential energy are ...
- Tue Nov 24, 2020 4:24 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3611387
Re: Post All Chemistry Jokes Here
What do you call a tooth in a glass of water?
One molar solution
One molar solution
- Tue Nov 24, 2020 4:21 am
- Forum: Quantum Numbers and The H-Atom
- Topic: Silver Electron Configuration
- Replies: 9
- Views: 2872
Re: Silver Electron Configuration
Silver falls into the coinage metals group (Au, Ag, Cu) which always have a (n-1)d10 ns1 configuration
- Tue Nov 24, 2020 4:19 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sampling Week 7/8 #6
- Replies: 6
- Views: 385
Re: Sampling Week 7/8 #6
The two lone pairs present on the sulphur atom in SF2 cause its distortion to the bent shape
- Tue Nov 24, 2020 4:18 am
- Forum: Bond Lengths & Energies
- Topic: Covalent Bond Length
- Replies: 13
- Views: 1494
Re: Covalent Bond Length
For covalent, the difference in electro negativity will determine if the bond is either polar or non polar. And the increasing number of bonds decreases the bond length. Higher bond order (number of bonds) indicated more attraction between electrons and the atoms will be held closer together
- Tue Nov 24, 2020 4:17 am
- Forum: Bond Lengths & Energies
- Topic: Covalent Bond Length
- Replies: 13
- Views: 1494
Re: Covalent Bond Length
With ionic bonds, the distance and charge affect the strength of the bond. For example, if there are more electrons being transferred then the bond would be stronger. With covalent bonds, the length of the bond and electronegativity affect the strength of the bond. Moreover, triple bonds > double bo...
- Tue Nov 17, 2020 6:42 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3611387
Re: Post All Chemistry Jokes Here
Q: Why can’t you believe anything atoms say?
A: They make up everything.
A: They make up everything.
- Tue Nov 17, 2020 6:40 am
- Forum: Octet Exceptions
- Topic: Octet Rule Exceptions
- Replies: 20
- Views: 1425
Re: Octet Rule Exceptions
There are three general exceptions to the octet rule: 1. Having too many electrons for an octet. This can be done when an element's valence shell has access to the d-orbitals in the third energy level and beyond. There needs to be enough orbitals to accommodate the extra electrons. I believe chlorin...
- Tue Nov 17, 2020 6:36 am
- Forum: Octet Exceptions
- Topic: Determining exceptions to the octet rule
- Replies: 2
- Views: 149
Determining exceptions to the octet rule
How do we determine when an atom has an expanded octet or is an exception to the octet rule?
- Tue Nov 17, 2020 6:33 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron configurations for Copper
- Replies: 1
- Views: 184
Electron configurations for Copper
Why is the electron configuration for Copper [Ar] 3d10 4s1 instead of [Ar] 3d9 4s2?
- Tue Nov 10, 2020 3:06 am
- Forum: Ionic & Covalent Bonds
- Topic: Size of Bonds
- Replies: 28
- Views: 898
Re: Size of Bonds
The additional electrons involved in a double bond exert greater attractive forces on the nuclei, thereby shortening the length of the bond.
- Tue Nov 10, 2020 2:56 am
- Forum: Student Social/Study Group
- Topic: grade worries
- Replies: 119
- Views: 19896
Re: grade worries
I know it's really easy to get stressed about final grades and point and stuff but there's still a whole midterm and the final exam and points you can earn through chemistry community and sapling. So don't stress too much! There is plenty of time to catch up and there are plenty of points still out ...
- Tue Nov 10, 2020 2:53 am
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2 Questions
- Replies: 16
- Views: 669
Re: Midterm 2 Questions
I think there was an announcement made about the type of questions on Midterm 2- He said there would be shorter and lower point questions so I assume that means there will be more of such questions.
- Tue Nov 10, 2020 2:50 am
- Forum: Student Social/Study Group
- Topic: Studying From Home
- Replies: 91
- Views: 6874
Re: Studying From Home
What I find is really helpful is studying in different parts of my house on different days. The change of scenery allows me to better concentrate on my work.
- Sat Nov 07, 2020 3:41 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3611387
Re: Post All Chemistry Jokes Here
Why was the mole of oxygen molecules excited when he left the singles bar?
He got Avogadro's number!
He got Avogadro's number!
- Sat Nov 07, 2020 3:38 am
- Forum: Lewis Structures
- Topic: 2B 11C
- Replies: 1
- Views: 173
Re: 2B 11C
So since glycine is an amino acid it has a general structure where an amine group (NH2) and a carboxyl group (COOH) are at opposite ends- with everything else in the middle. So you would tend to draw the lewis structure like that too
- Tue Nov 03, 2020 11:05 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3611387
Re: Post All Chemistry Jokes Here
What's the dullest element?
Bohrium!
Bohrium!
- Tue Nov 03, 2020 11:04 am
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 1
- Replies: 9
- Views: 396
Re: Midterm 1
my TA said that a couple of versions had errors in question #4- I'm not sure if it was the same one all across or what exactly happened but yes, there were a couple of errors in some of the midterm questions
- Tue Nov 03, 2020 11:01 am
- Forum: Ionic & Covalent Bonds
- Topic: Electron Affinity
- Replies: 5
- Views: 173
Re: Electron Affinity
Chlorine has a higher electron affinity.
As an exception to the rule, Cl has higher EA as compared to F. Fluorine has very small atomic size and this makes the fluoride anion unstable due to very high charge/mass ratio. F has no d orbitals so it has small atomic size. F has EA less than that of Cl.
As an exception to the rule, Cl has higher EA as compared to F. Fluorine has very small atomic size and this makes the fluoride anion unstable due to very high charge/mass ratio. F has no d orbitals so it has small atomic size. F has EA less than that of Cl.
- Tue Oct 27, 2020 5:22 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: delta x for textbook question 1b 27
- Replies: 2
- Views: 170
Re: delta x for textbook question 1b 27
I'm not sure if you meant delta-V and wrote delta-X by mistake, but just to clarify this question is asking us to find the minimum uncertainty which is delta X. The two values given in the question tell us the mass and velocity of the bowling ball. Since the velocity is 5± 5m/s delta-V would be 10, ...
- Tue Oct 27, 2020 5:10 am
- Forum: Properties of Light
- Topic: Week 2-4 Sapling HW #6
- Replies: 2
- Views: 123
Re: Week 2-4 Sapling HW #6
The electron that is excited to the n=6 energy level can transition to the 5,4,3,2 and 1 energy levels. Therefore there are a total of five possible transitions that will produce five distinct spectral lines (if your n2 value is 6)
- Mon Oct 26, 2020 4:21 am
- Forum: Properties of Electrons
- Topic: So confused on Sapling Question
- Replies: 4
- Views: 248
Re: So confused on Sapling Question
I'm not sure if that was clear but ill show you the working I did so you get a better idea...
3.59x10^-19=(6.626x10^-34)*(3.0x10+08)/lambda
therefore, lambda = 5.54x10^-7
then to convert it you'd do:
5.54x10^-7 x 1Å/10^-10m = 5540Å
3.59x10^-19=(6.626x10^-34)*(3.0x10+08)/lambda
therefore, lambda = 5.54x10^-7
then to convert it you'd do:
5.54x10^-7 x 1Å/10^-10m = 5540Å
- Mon Oct 26, 2020 4:17 am
- Forum: Properties of Electrons
- Topic: So confused on Sapling Question
- Replies: 4
- Views: 248
Re: So confused on Sapling Question
Hi! So when it says the typical work function of the metal is 3.59x10^-19 it's basically saying that's how much energy needs to hit the metal to eject an electron. So you can use the E=h*c/lambda equation giving E the value of 3.59x10^-19 to calculate the wavelength. Once you do that all you have to...
- Sat Oct 24, 2020 2:13 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3611387
Re: Post All Chemistry Jokes Here
Q: What is the chemical formula for "banana"?
A: BaNa2
A: BaNa2
- Tue Oct 20, 2020 9:10 am
- Forum: Student Social/Study Group
- Topic: Electron mass
- Replies: 3
- Views: 86
Electron mass
Will we need to memorize the mass of an electron for questions using the de Broglie equation or will we be given that in the formula sheets?
- Tue Oct 20, 2020 7:53 am
- Forum: Photoelectric Effect
- Topic: Applications of the photoelectric effect
- Replies: 2
- Views: 254
Applications of the photoelectric effect
What are some real-world applications of the photoelectric effect/ how is it used in our everyday life?
- Tue Oct 20, 2020 7:51 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3611387
Re: Post All Chemistry Jokes Here
Q: What did the scientist say when he found 2 isotopes of helium?
A: HeHe
A: HeHe
- Tue Oct 20, 2020 7:50 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3611387
Re: Post All Chemistry Jokes Here
Guess i'll just have to post bad chemistry jokes because all the good ones Argon
- Wed Oct 14, 2020 3:13 am
- Forum: Properties of Light
- Topic: Electric Field Wave vs Magnetic Field Wave
- Replies: 3
- Views: 167
Re: Electric Field Wave vs Magnetic Field Wave
Hi Ian!
As Emily said I don't think Professor Lavelle expects us to know too much about the particulars of the electromagnetic field but one thing I think is important to understand is that the magnetic field oscillates 90 degrees (perpendicularly) to the electric field.
As Emily said I don't think Professor Lavelle expects us to know too much about the particulars of the electromagnetic field but one thing I think is important to understand is that the magnetic field oscillates 90 degrees (perpendicularly) to the electric field.
- Tue Oct 13, 2020 3:08 am
- Forum: Limiting Reactant Calculations
- Topic: Difference between limiting reactant and limiting reagent?
- Replies: 14
- Views: 2339
Difference between limiting reactant and limiting reagent?
Is there a difference between limiting reactants and limiting reagents? Do we need to calculate them a different way?
- Tue Oct 13, 2020 2:59 am
- Forum: Administrative Questions and Class Announcements
- Topic: Students in different time zones [ENDORSED]
- Replies: 27
- Views: 2375