CHEMISTRY COMMUNITY

Sally kim 4F

When labeling sigma bonds, label all the single bonds as sigma bonds, and all the remaining double and triple bonds as pi bonds.

Sally kim 4F

Speed of light, c, in the equation is m/s!

Sally kim 4F

Doing sig figs is the same for any other problem you would do with sig figs. Don't worry about it too much.

Sally kim 4F

You need to know if they will turn out either acidic or basic

Sally kim 4F

Yeah, just always keep at p first

Sally kim 4F

Can someone list the strong/weak acids and bases that we should already know or have memorized?

Sally kim 4F

Does anyone have any small tips on how to name acids and bases??

Sally kim 4F

Water is left out of calculating Ka because it is neutral. Therefore, it doesn't really affect anything in the formula, and doesn't change anything if it's left out

Sally kim 4F

With the problems using NH3, we consider it as a Bronsted base because typically it is a weak base

Sally kim 4F

The only way that I know those charges quickly is because I memorized the polyatomic ions. There are lots of ways to memorize the ions, do whatever helps you best memorize. I did it by making them into words. So for example, CO3 2-, in my head it would be cow 2. So like the 3 turns into a "w&qu...

Sally kim 4F

I think you need to know most, if not, all of the strong acids and how to classify a strong acid.

Sally kim 4F

I think that the format will be really similar to the midterm and I think that there will be more questions from the end of the year materials than the earlier topics we did.

Sally kim 4F

I'm sure that would be perfectly fine, just don't forget to label which is homework 9 and 10!

Sally kim 4F

It's a type of ligand that binds to a metal in a coordination complex. When binding to the metal ion, the chelate forms a ring of atoms.

Sally kim 4F

How many lone pairs can the Bent Shape have?

Sally kim 4F

Can someone list the bond angles for the different molecule shapes that I can refer back to?

Sally kim 4F

I'm so lost on this problem!
Describe the structure of the formaldehyde molecule, CH 2 O, in terms of hybrid orbitals, bond angles, and s - and p -bonds. The C atom is the central atom to which the other three atoms are attached.
How do you approach this first?

Sally kim 4F

What did you guys get for this: Identify the hybrid orbitals used by the atom in boldface red type in each of the following species: (a) B F 3 ; (b) As F 3 ; (c) Br F 3 ; (d) Se F 3

Sally kim 4F

Can someone help me with this: There are three isomers of dichlorobenzene, C6H4Cl2, which differ in the relative positions of the chlorine atoms on the benzene ring. (a) Which of the three forms are polar? (b) Which has the largest dipole moment?

Sally kim 4F

square planar, seesaw

Sally kim 4F

Tetrahedral, linear, square planar, octahedral, trigonal bipyramidal, trigonal planar

Sally kim 4F

What is the significance of hydrogen bonding that Lavelle said in the lecture?

Sally kim 4F

As of right now, we don’t need to worry about it, but later I think Lavelle will let us know what is okay when dealing with shapes.

Sally kim 4F

I don’t understand this question: How many s-bonds and how many p-bonds are there in (a) H2S and (b) SO2? helpp

Sally kim 4F

Why is the interaction between I2 the strongest out of Br2, F2, Cl2?

Sally kim 4F

I think one key topic was that a shape of a molecule contributes to the strength of interaction. Therefore, the more surface area there is then the more area there is to be induced.

Sally kim 4F

The strongest to weakest bonds in molecules are covalent, ionic, hydrogen, and then dipole-dipole.

Sally kim 4F

Isoelectronic are two ions that have the same electronic structure and the same number of valence electrons. An example would be F- and Na+.

Sally kim 4F

I think that if there was a complicated chemical name given, then the molecular formula will be provided for us. But I think we will have to know polyatomic ions on our own. Just try to memorize them if you have some time; there aren't that many so it won't be too hard. Also, I think we'll also have...

Sally kim 4F

Help pleasee; how would you approach this problem?
Write the ground-state electron configuration for each of the following atoms:
a) silver
b) beryllium

Sally kim 4F

Yes, you should definitely know what the Pauli Exclusion Principle and the Hunds rule is. Also, make sure to study the Aufbau principle as well!!

Sally kim 4F

Bond lengths and energies will be on the midterm. Just study up to Focus 2D because the midterm should go up to there.

Sally kim 4F

What's the first thing you would do to attempt this problem: What are the principal and orbital angular momentum quantum numbers for each of the following orbitals:
a) 6p
b) 3d
c) 2p
d) 5f

Sally kim 4F

Why are s-block metals typically more reactive than p-block metals?

Sally kim 4F

How do you do this problem: Of the following sets of four quantum numbers {n, l, m(l), m(s)}, identify the ones that are forbidden for an electron in an atom and explain why they are invalid:
a) {4, 2, -1, 1/2}
b) {5, 0, -1, 1/2}
c) {4, 4, -1, 1/2}

Sally kim 4F

I'm assuming it will be up to the beginning of chemical bonds, and not much of molecular shape.

Sally kim 4F

Can someone summarize the decreasing -> increasing trends on the periodic table of IE, EA, EN, and atomic radius?

Sally kim 4F

Go to the sessions that Lavelle provides, and I would also suggest that you watch YouTube videos on topics that you don't understand. I personally, understand the best through step-by-step videos so hopefully that helps you too!

Sally kim 4F

What is the Aufbau Principle and how does it relate to electron configuration?

Sally kim 4F

Can someone please explain what the Pauli Exclusion Principle is?

Sally kim 4F

The difference between the two is that one measures the energy of a photon, while the other measures kinetic energy, which a mass possesses by being in motion. E=hv is the one that measures the energy of a photon, and E=1/2mv^2 measures the kinetic energy of a mass.

Sally kim 4F

The unit for wavelength is m, since it is just a measurement of distance. Nanometers and picometers are both also alright in terms of using units.

Sally kim 4F

How I understand it is that electrons are particles because everything made is made up of particles, and an abundance of those particles would create a sort of wave, electromagnetic wave. This is actually known as the wave=particle duality, where the idea came from famous scientists, such as Einstei...

Sally kim 4F

I think eventually it'll be good to have the polyatomic ions memorized and possibly the trends for ionic charges because I don't think the reactions will always be given to us.

Sally kim 4F

I haven't found one in the textbook or his website, but I usually search it up on the internet: I search up "chart for si units" and it should be the first picture. Hope that helps!

Sally kim 4F

The photoelectric effect needs to be carried out in a vacuum because it will prevent less collision between the photo electrons and air molecules, which in turn will prevent energy loss.

Sally kim 4F

According to Britannica, Stefan-Boltzmann law is a "statement that the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature." The way that I understand it is that all objects lose or gain energy through electromagnetic radiation.

Sally kim 4F

Sometimes it will be in grams, sometimes it will be in moles. It varies depending on what the question is asking. It should be pretty clear in the problem what they are specifically looking for, so don't worry too much!

Sally kim 4F

Definitely use sig figs. When you do use sig figs on his tests, make sure to only apply it on the final answer instead of the values obtained throughout the problem.

Sally kim 4F

When writing formulas, the charge is essential because it tells you how much you need of each element. I would suggest searching up the "trend for ionic charge" to easily determine the charge of an element.

Sally kim 4F

Definitely watch the modules again and continue to take notes on both the book and the videos he gives. You can also keep doing the fundamental problems listed, because there is a good chance he may use one of those questions.

Sally kim 4F

Referring to Lavelle's first module, the empirical formula shows the relative number of atoms that a molecule has, and the molecular formula shows the actual number of atoms. By this, we can understand that the empirical formula is the simplest ratio of the elements. Therefore, if the formula given ...

Sally kim 4F

Hii!! I used to be confused about this also, but here's what I think. When you use sig figs, I believe that you only apply it to the final answer because if you keep applying it to every value you get, the final answer may not be as accurate.

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