CHEMISTRY COMMUNITY

Victoria Sigala 2A

If I'm not wrong, I think the resonance structure with the least amount of formal charge is most favorable. So a structure with a formal charge of 0 would be the best one.

Victoria Sigala 2A

The only way you can really know how much an octet is expanded by, or how many additional lone pairs a central atom will have, is by drawing out the molecule. You know that a central atom that only has available d-orbitals will only be able to hold up to 18 electrons total, while one with available...

Victoria Sigala 2A

It's called the Milky Way because the Greek Goddess Hera supposedly sprayed milk across the sky.

Victoria Sigala 2A

A ligand is any atom or molecule attached to a central atom. A ligand is usually a metallic element, in a coordination or complex compound.

Victoria Sigala 2A

Correct! A pi bond only exists if a sigma bond is present.

Victoria Sigala 2A

We're most likely going to have to memorize it.

Victoria Sigala 2A

We would first put ligand names in alphabetical order ignoring the prefixes. Then we would name the metal followed by its oxidation number in parentheses. Finally, we name the compound outside of the brackets

Victoria Sigala 2A

Haha, thanks! I can use this to remember the strength between each!

Victoria Sigala 2A

Honestly, I don't have any easy tips to give but what I did was look at a chart as some people have posted and just studied it. I still haven't memoried all of them but for the most part, I don't have to refer back to the chart anymore.

Victoria Sigala 2A

Hey!
For winter break I'm going back home! I'm looking forward to a fun time with family and a long break to not think about school!

Victoria Sigala 2A

Yes email or talk to your TA in person as soon as possible! TAs usually respond faster than professors. Best of luck!

Victoria Sigala 2A

Midterm 2 scores have already been released on ccle and I'm super thankful for my family and friends and all their support :)

Victoria Sigala 2A

I think you could look at its symmetry. If it is symmetrical then most likely it'll be nonpolar, while if it's not then it's polar.

Victoria Sigala 2A

You just have to look at the number of electrons that the molecules have. The more electrons the stronger the LDF.

Victoria Sigala 2A

Hi! Basically, a seesaw shape has 4 bonded pairs and one lone pair. It's the same as the original bipyramidal except with one lone pair instead of the 5 bonded pairs. Hope this helps! :)

Victoria Sigala 2A

Hi, H2O would be just bent and not tetrahedral. The lone pairs creates this bent shape resulting in a bond angle of 104.5 and not 109.5 like the bond angels for a tetrahedral.

Victoria Sigala 2A

Hi! A radical is basically a molecule with an unpaired electron. Usually, we see even numbers of electrons in a molecule so when we are drawing the lewis structures we see atoms with lone pairs like this :N but if it was a radical then it would look like this .N (didn't put all the valance electrons...

Victoria Sigala 2A

Hey! Lewis bases are atoms that donate electrons while Lewis acids are atoms that accept the electrons. I'm not really too sure how to find out looking at the formula but looking at a Lewis structure we can tell the charge. Positively charged molecules will be acids as they will be accepting electro...

Victoria Sigala 2A

Honestly, I find myself overthinking and stressing before big tests as well. What helps me in these situations is just to take a long hot shower to let my body relax and just remind myself that one test or just tests, in general, don't define me. There are other opportunities to show my capabilities.

Victoria Sigala 2A

I like to take long showers and after just watch Netflix or Youtube while laying in bed. Sometimes, even though it sounds kind of odd, I like to clean just because it takes my mind off things and when I'm done it feels good to see a clean space.

Victoria Sigala 2A

Hi :) A Lewis acid will accept a pair of electrons and a Lewis base will donate the pair of electrons. This forms a covalent bond.

Victoria Sigala 2A

I'm kind of confused on this too but all I know from the lecture is that a Lewis acid will accept a pair of electrons while a Lewis base will donate the pair of electrons.

Victoria Sigala 2A

Hey! Lone pairs refer to the valence electrons not being shared in an atom. For example, a lone pair in oxygen would look like this (the two dots), :O if it was a shared pair then it would look like this (the line) O-O. Hope this makes sense!

Victoria Sigala 2A

No, we don't have to memorize the names and symbols of an element on the periodic table. For our midterm and final we are allowed to have a copy of the periodic table provided on the class website.

Victoria Sigala 2A

I don't think it would be necessarily wrong to leave it in fraction form but you will almost always see it as a whole number, so I would just make sure to always make it to the nearest whole number.

Victoria Sigala 2A

Isoelectronic just means that there are the same number of electrons in a species or have a similar electronic structure.

Victoria Sigala 2A

The formula for formal charge is: Formal Charge (FC)= # of Valence electrons of element (V)- (lone pairs (L)+ Shared electrons (S)/2). FC=V-(L+S/2)

Victoria Sigala 2A

The 3d orbital requires less energy to fill up compared to 4s, hence why it fills up first. There are only some exceptions though, I don't think it applies for all of 3d.

Victoria Sigala 2A

In the example you gave, it doesn't matter which O the double bond is at because they're all the same. However, if multiple elements could have a double bond, it's best to create a double bond where you'll get the formal charge of 0 because that's where it's most stable. You can find the formal char...

Victoria Sigala 2A

Hi! I'm not really sure how many exceptions there are exactly but for these exceptions, but I know that 3d comes before 4s because it is lower in energy than the 4s orbital therefore it fills up first. I hope this helps!

Victoria Sigala 2A

Hey! The 3d block comes in front of the 4s block when the 3d orbital becomes lower in energy than 4s which happens from Scandium and onwards. Hopes this helps!

Victoria Sigala 2A

Hey! I'm honestly not to sure what they are either, but I just know that when you are solving problems, you always want your units to cancel out. There's a lot of converting units and it might help write them all out just so you can see what is getting cancelled out. I'm not sure if I answered your ...

Victoria Sigala 2A

Hi! Yes, the first 3 quantum numbers represent an orbital, that is n, l, ml and each orbital does hold two electrons that differ in spin.

Victoria Sigala 2A

For the midterm, we are allowed to print out the equations and constant sheet that Dr. Lavelle provided for us (other versions are NOT accepted). You can also bring a calculator, scratch paper, and a pencil. There should be no writing on any of the papers and the TAs will be checking our papers befo...

Victoria Sigala 2A

I'm not sure if I understood your question correctly but basically you're trying to get your ratios to be whole numbers. In the example we did in class we got 3.41 mol of C, 4.58 mol of H, and 3.41 mol of O. We would divide each of these values by the least amount of moles so in this case, it's 3.41...

Victoria Sigala 2A

Omg I had completely forgot about that! thank you for the reminder!

Victoria Sigala 2A

The material on the midterm will be from week 1 to week 3 (October 15th).

Victoria Sigala 2A

In De Broglie's equation we use kg for mass in order to be able to cancel the Jules from Planks constant as it is (kg)(m^2/s^2).

Victoria Sigala 2A

I'm not 100% sure but I don"t think the size of the particle matters for speed. I think it just matters when you talk about acceleration, the smaller the particle the easier it is for it to change its acceleration while the bigger the particle is the harder it will be to change its acceleration.

Victoria Sigala 2A

I would recommend doing the practice problems he assigns as well as focusing a bit more on the sections you're having most problems with. If you are in AAP there we will do midterm review on Thursday the 21st and I believe that will be very helpful.

Victoria Sigala 2A

Thank you so much!! This is going to help me so much because I would always forget them!

Victoria Sigala 2A

We rarely have to convert from Fahrenheit to Celsius. Most of the time the problem is already in Celsius or Kelvin.

Victoria Sigala 2A

It was kinda confusing for me too at first but basically, visible light has shorter wavelengths while infrared radiation has longer wavelength. The shorter the wavelength the higher the frequency and the longer the wavelength the lower the frequency.

Victoria Sigala 2A

Yes different molecules can have the same empirical formula because the the empirical formula is just the relative number of atoms. However it would not be able to have the same molecular formula because this is the actual number of atoms in the molecule.

Victoria Sigala 2A

I found this on google, "A chemical oscillator is a complex mixture of reacting chemical compounds in which the concentration of one or more components exhibits periodic changes." I don' know if this helps but I know oscillation is a repeated motion back and forth between two values, like ...

Victoria Sigala 2A

Week 1's homework just consisted of the 10 achieve question with the due date (the others were just to get extra practice and get used to achieve) and I believe 5 posts on chemistry community, either your own post or reply, but I wasn't too sure on that part.

Victoria Sigala 2A

This are not for a grade, just to familiarize yourself with achieve. These assignments are also for your own benefit, for example if you are struggling on a topic these are some good practice problems to work on. It also doesn't hurt to reinforce your knowledge on these topics so you don't forget th...

Victoria Sigala 2A

If you're answering with significant figures round your answer (at the very end not in between steps if avoidable) to the amount of significant figures present in the number in the question.

Victoria Sigala 2A

I looked on google and found that it said "Oscillation is defined as the process of repeating variations of any quantity or measure about its equilibrium value in time. Oscillation can also be defined as a periodic variation of a matter between two values or about its central value." As fo...

Victoria Sigala 2A

Thank you so much for this advice! I know many of us students at UCLA tend to feel like they should know things right away so knowing that there is so much help makes it easier for us to accept it.

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