CHEMISTRY COMMUNITY

505352202

It is still an acid-base reaction since there is an acid and base for the reaction, however, I am not sure if it's a neutralization reaction since the product is neither water nor salt.

505352202

The triple bond is composed of one σ bond and two π bonds. The sigma bond is formed from head-to-head overlap of the sp hybrid orbitals from the C and N atoms. The two π bonds in the triple bond are formed from overlap of the two unhybridized p atomic orbitals on each C and N atom.

505352202

I use this to help me remember: Bronsted Acid is Proton Donor (BAPD) Bronsted Base is Proton Acceptor (BBPA) and then for Lewis definitions: Lewis Acids are Electron Acceptors (LAEA) Lewis Bases are Electron Donors (LBED) *I put weird words to help me remember like Los Angeles Electron Asooscation a...

505352202

I have the same issue, and it's really frustrating. I refresh the page, and sometimes it works. Thank you for voicing this. I thought I was the only one.

505352202

I have the same issue, and it's really frustrating. I refresh the page, and sometimes it works. Thank you for voicing this. I thought I was the only one.

505352202

You should email them because they don't always post them.

505352202

I think you need to take both of them into consideration and resonance since resonance provides stability aswell. I wonder if we can choose just one of those characteristics and base our answers on that.

505352202

I am not sure if this was already mentioned, but the bond length of HF is pretty short, so it makes it harder to break that bond. Shorter bonds = stronger bonds = weaker acids.

505352202

Most of the time, H+ is referring to H3O+. It is just a shorter way to write it. You have to remember that there is interaction with water H2O, so when you have that additional H+, you get H3O+ Hydronium.

505352202

It does not really matter. When he puts the - before like -OH, he is trying to emphasize that the oxygen is the atom with the negative charge and not the hydrogen.

I hope this helps!

505352202

Thank you for this. It is easy to lose sight of the bigger picture (the bigger goal) when there is so much work to do.

505352202

Constance Newell wrote:Is our exam still on the weekend? Or did the date change?

Our exam is scheduled for Sunday, December 13 from 11:30 am-2:30 pm

505352202

Constance Newell wrote:Is our exam still on the weekend? Or did the date change?

Our exam is scheduled for Sunday, December 13 from 11:30 am-2:30 pm

505352202

I try not to think of the exam because it makes me feel worse, and there is nothing that you can do after the exam. I go for a long jog/walk/run after these exams and it helps (I do it for the endorphins lol)

505352202

I make review sheets after every lecture to make sure all the information I need is in a condensed format that I can look back at when I do my textbook problems.

505352202

Do all the other discussion sections meet this week? I have mine tomorrow at 9am and I am not sure.

505352202

Are the exam grades out yet? Does anyone know?

505352202

Make sure you have the latest version of respondus and zoom too if you had trouble before! I searched online for how to check if you have the most updated version and how to update, which was pretty simple. How did you update respondus? Hi, sorry for this late response! Basically you run Respondus ...

505352202

Kyla Villarama 3J wrote:Make sure you have the latest version of respondus and zoom too if you had trouble before! I searched online for how to check if you have the most updated version and how to update, which was pretty simple.

How did you update respondus?

505352202

I don't know how to update either. I can't find that button. Is it maybe different for a mac laptop because that is what I am using.

505352202

LeanneBagood_2E wrote:adding on to this, where would van der waals be in the order?

Aren't van der waals and london dispersion the same force?

505352202

This is pretty off-topic, but I think I may have missed some information during the discussions... I don't know where to find the given periodic table and equations sheet to print. Can someone point me towards it? Thanks :) You can find it on the tops of the class website under "Constants and ...

505352202

I like to think of high polarizability for anions since they have more electrons and more electrons = further from the nucleus and aren't easily controlled by that positive charge (so more electrons or negative charge you have, the higher the polarizability) vs. high polarizing power for cations sin...

505352202

Crystal Odipo wrote:In last Friday's lecture when we draw the Lewis structure of PCI5, how do we determine which atom of CL gets the darker shaped wedge to show the atom is coming towards us and how do we decide which atom is the shaded wedge, pointing away from us?

Will this topic be in our 2nd midterm?

505352202

The other difference that I think helps distinguish them is that electronegativity is a chemical property of electron attraction vs. electron affinity, which is the amount of energy released when an electron is gained.

505352202

Is there a way to predict which element in an atom will have the radical? this came up in textbook problem 2C.5. The radical went with Cl rather than O, and I can't explain why except for that Cl has an odd number of valence electrons to start with. Hi! I believe that the placement of the lone elec...

505352202

We haven't had a lecture on naming compounds so I hope he provides us with the chemical formulas.

505352202

Hi! The solutions manual on sapling says that the answer to C) is (n-1)d3ns2 for group 5 transition metals, which is correct because group 5 metals have 3 valence electrons in the d orbital and 2 valence electrons in the s orbital (maybe you were looking at the wrong question possibly?) Hope this c...

505352202

The alkali metals have a valence shell with the configuration ns 1 , with n being the principal quantum number of the atom. Similarly, a valence shell for a group 15 atom would have the configuration ns 2 np 3 . A group 5 transition metal would have a configuration of (n-1)d 3 ns 2 . The coinage me...

505352202

The alkali metals have a valence shell with the configuration ns 1 , with n being the principal quantum number of the atom. Similarly, a valence shell for a group 15 atom would have the configuration ns 2 np 3 . A group 5 transition metal would have a configuration of (n-1)d 3 ns 2 . The coinage me...

505352202

https://www.youtube.com/watch?v=Aoi4j8es4gQ

This video helped me conceptualize this topic. I hope it helps you!

505352202

I really love this video because it discusses the rends very clearly: https://www.youtube.com/watch?v=hePb00CqvP0

Hope it helps!

505352202

Logan Wiedemann 3J wrote:Two atoms are walking down the street. One atom says to the other, "Hey! I think I lost an electron!" The other asks, "Are you sure?" "Yes, I'm positive!"

Lose and electron? Gotta keep an ion it.

505352202

Jasmine Ho 2H wrote:I believe neighboring atoms just means 2 of the same atoms that are directly next to each other with no space in between.

I don't think they have to be the same atoms, or do they?

505352202

I also remember him saying in lecture not to worry about f orbitals and that we would focus primarily on s,p, and d orbitals. I wonder why he gave us a problem with an f orbital if we didn't need to "worry about it."

505352202

No, we don't always make expanded octets even if they are possible on our lewis structure. Sulfur was the example given in the lecture, but other elements with an expanded octet include Chlorine, Silicon, and Phosphorus. All these elements contain d-orbitals, and that's why they can have more than 8...

505352202

I like to study outside and get some sunlight. It easy to forget about breaks and your health when you have multiple classes to worry about. I take multiple mental breaks when I study, and sometimes when things are not clicking, I go for a walk/jog to clear my mind before coming back to the problem.

505352202

Sulfur is also part of this group of exceptions. It can hold 10 electrons, and that is why we refer to it as an expanded octet.

505352202

Does anyone know when we will get our exam results? And will the scores be curved? I believe we get our scores after all discussion sections have taken it and the exams closes, which is Friday - so, we should get our results by the end of the day on Friday. The course isn't curved, so I don't think...

505352202

Using the search bar is the easiest way for me.

505352202

So if we wanted to write 20.00 in scientific notation taking into account sig figs would it be 2.000 x 10^1? I thought trailing zeros were not significant

505352202

Lose an electron? Gotta keep an ion it.

505352202

It does not say anything regarding this on the syllabus unless I missed it. I really hope the second midterm and final are not cumulative. That would be too many topics to remember.

505352202

Can he maybe post videos that are shorter and have fewer questions on the assessments? They helped me so much with my studying for the midterm, especially because you could go at your own pace and rewatch/rewind them if you missed something. I hope he considers continuing this resource.

505352202

Does anyone know when we will get our exam results? And will the scores be curved?

505352202

You don't have to memorize formulas since they will be provided to us for the exam. I try to see what the information is provided and understand what they are asking for us to solve for, then I try to use/find the equations that use that information we have and go from there.

505352202

Everything is a wave! This crash course video helped me understand this concept a bit better! https://www.youtube.com/watch?v=qO_W70VegbQ
Hope it helps!

505352202

I had discussion today, and it will be multiple-choice, and you will need to have another device to access zoom as you take the exam since currently, Respondus kicks you out from Zoom when you open the quiz/midterm. You can use your phone as the second device and don't need an additional camera, as ...

505352202

I hope he creates more modules for us to watch, as well. They are really useful!

505352202

What about when we use known constants to solve for an answer, like for example c=3.0x10^8. Should we then have our final answer with only one sig figure or should we ignore that and follow the number of sig figs that the numbers provided to us in the problem have?

505352202

Ryan_Kien_1L wrote:I got my Sapling Access card maybe a week after I ordered mine for shipping, I would shoot them an email if you're getting worried, but I assume you should be able to just walk in and get it.

Thank you!

505352202

on the same topic, will there be an exam review or practice exams we can use to study?

505352202

On the same note, what formulas/information will be provided to us, and what are we expected to memorize?

505352202

Hello, has anyone received any updates on their Ebook/Sapling access card from the UCLA Store? I chose the pickup option to get it faster, but I still haven't received any notification.

505352202

no, I believe you can use any external camera that works with your computer. I think you can even use your phone camera for test purposes. "For midterms and final, joining the Zoom proctoring session using your cell phone is another option. The student needs to make sure they have Zoom set up o...

505352202

RULES FOR ROUNDING OFF: • DO IT AT END OF CALCULATION IN ONE STEP • IF LAST DIGIT IS ABOVE 5: ROUND UP (2 sf then 2.36 is 2.4) • IF LAST DIGIT IS BELOW 5: ROUND DOWN (1sf then 2.36 is 2) • IF LAST DIGIT IS 5: ROUND TO NEAREST EVEN NUMBER (2 sf then 2.35 is 2.4 and 2.65 is 2.6) Note: Round to the nea...

505352202

I usually don't round either. I keep the true values saved on my calculator to get the most accurate answer. I round until the very last step, usually to the number of places that the numbers on the problem used (to be consistent).

505352202

Maybe it helps if you think of it like this: diluting means to add a liquid or another solvent but not more solute (or what is being dissolved) that is why the moles don't change

505352202

DMaya_3C wrote:I noticed on the example in today's lecture that he keeps writing mol. L^-1. We can just write mol/L when completing a problem with the M1V1 = M2V2 equation right?

Yes, you can write it either way. They mean the same thing. It's just different notation.

505352202

Chemical equations obey the law of conservation of mass (matter cannot be created or destroyed). That is why we balance the equation to get the same number of atoms of each element on each side of a chemical equation. I think you might be confusing it with the number of moles.

Hope this helps!

Search found 60 matches