CHEMISTRY COMMUNITY

Khushi_Gupta_1A

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!

Khushi_Gupta_1A

cooking is probably one of the biggest ways I relax

Khushi_Gupta_1A

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.

Khushi_Gupta_1A

What kind of fish is made out of 2 sodium atoms?
2 Na

Khushi_Gupta_1A

What is the chemical formula for "banana"?

BaNa2

Khushi_Gupta_1A

What is a chemist’s favorite holiday song?
Oh Chemist-TREE, oh Chemist-TREE!

Khushi_Gupta_1A

I felt really confident after midterm 2 and used the same study techniques but honestly the final was crazy :(

Khushi_Gupta_1A

Q: Why do you go to jail for throwing sodium chloride for somebody?
A: Because its a salt.

Khushi_Gupta_1A

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...

Khushi_Gupta_1A

How do you use the Coordination number of a compound o determine it's shape without drawing it out?

Khushi_Gupta_1A

Can someone explain what a neutral ligand is and some examples of it?

Khushi_Gupta_1A

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 ...

Khushi_Gupta_1A

What do you call a tooth in a glass of water?

One molar solution

Khushi_Gupta_1A

Silver falls into the coinage metals group (Au, Ag, Cu) which always have a (n-1)d10 ns1 configuration

Khushi_Gupta_1A

The two lone pairs present on the sulphur atom in SF2 cause its distortion to the bent shape

Khushi_Gupta_1A

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

Khushi_Gupta_1A

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...

Khushi_Gupta_1A

Q: Why can’t you believe anything atoms say?
A: They make up everything.

Khushi_Gupta_1A

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...

Khushi_Gupta_1A

How do we determine when an atom has an expanded octet or is an exception to the octet rule?

Khushi_Gupta_1A

Why is the electron configuration for Copper [Ar] 3d10 4s1 instead of [Ar] 3d9 4s2?

Khushi_Gupta_1A

The additional electrons involved in a double bond exert greater attractive forces on the nuclei, thereby shortening the length of the bond.

Khushi_Gupta_1A

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 ...

Khushi_Gupta_1A

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.

Khushi_Gupta_1A

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.

Khushi_Gupta_1A

Why was the mole of oxygen molecules excited when he left the singles bar?

He got Avogadro's number!

Khushi_Gupta_1A

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

Khushi_Gupta_1A

What's the dullest element?

Bohrium!

Khushi_Gupta_1A

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

Khushi_Gupta_1A

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.

Khushi_Gupta_1A

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, ...

Khushi_Gupta_1A

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)

Khushi_Gupta_1A

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

Khushi_Gupta_1A

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...

Khushi_Gupta_1A

Q: What is the chemical formula for "banana"?
A: BaNa2

Khushi_Gupta_1A

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?

Khushi_Gupta_1A

What are some real-world applications of the photoelectric effect/ how is it used in our everyday life?

Khushi_Gupta_1A

Q: What did the scientist say when he found 2 isotopes of helium?
A: HeHe

Khushi_Gupta_1A

Guess i'll just have to post bad chemistry jokes because all the good ones Argon

Khushi_Gupta_1A

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.

Khushi_Gupta_1A

Is there a difference between limiting reactants and limiting reagents? Do we need to calculate them a different way?

Khushi_Gupta_1A

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