CHEMISTRY COMMUNITY

Josian1A

What determines the size of the electron cloud?

Josian1A

We did this example in class but I'm still a bit confused. Why does CCl4 have a significantly higher boiling point than CH4?

Josian1A

In an earlier post chem_admin mentioned test 3 would cover chapter 3, and they didn't mention any exceptions. I would go over some of the hw problems relating to bond lengths just to be safe.

Josian1A

Carbon and Sulfur are actually really close in electronegativity (Carbon 2.55 and Sulfur 2.58), but as someone said earlier, using Fluorine as a reference point is a good strategy because it is the most electronegative element. According to my TA, we probably won't be asked to distinguish elements s...

Josian1A

I believe that magnetic spin is important because it describes the magnetic field that the electron produces. And since magnetic field can only be positive or negative that is what gives us the only two possible "spins" of an electron. Magnetic spin was actually a later discovery that help...

Josian1A

Why is it 3d and not 4d? For the other orbitals the coefficient represents the period its in, so why isn't it the same for the d orbital.

Josian1A

So a few people have already asked why 4s fills up before 3d, which I understand. What I wanted to know is why is it that the 4s orbital is lower in energy than the 3d orbital before it is filled, but is higher in energy after it is filled? Someone may have asked this already but I couldn't seem to ...

Josian1A

Also you should know the wavelengths for visible light are, roughly, from 400nm(violet) to 700nm(red). And as mentioned, they are a part of the Balmer Series.

Josian1A

I asked some of the TAs/UAs and they said that it would be fine to use the Rydberg equation, because essentially the Rydberg formula is just a simplified equation derived from \Delta E = E_{f} - E_{i} (where E =- \frac{hR}{n^2} ). I believe the purpose of Dr. Lavelle doing it step-by-step in class w...

Josian1A

I was also confused between the practicality of using $\frac{h}{4\pi }$ instead of $\frac{h}{2\pi }$ . What is the difference between the two?

Josian1A

The constant was found experimentally when Planck was studying blackbody radiation. He basically found that radiation (eg light) is emitted/absorbed in discrete energy packets (quanta). This is determined by the relationship between the frequency of radiation and Planck's constant. Here's a pretty c...

Josian1A

As other people have already said, the key takeaway is that Electric and Magnetic Fields are perpendicular, but if you wanted to learn more about why this is true you might want to look into Maxwell's Equations. I'm not sure if this course covers Maxwell, but you will learn it if you take the physic...

Josian1A

its a song by David Bowie

Josian1A

I believe we're supposed to use 3x10^8 m/s. On exams/tests we'll be given a sheet with all the important constants included, so don't stress too much about it.

Josian1A

Just need some clarification. The test will be held in discussion, correct?

Josian1A

The problem asks for the net production of gas, and both reactants and products are gases. So all you have to do is: (sum of coefficients from products) - (sum of coefficients from reactants) = net number of moles produced. So you should have 36-30=6 (A)

Josian1A

I noticed that in the "Audio-Visual Focus-Topics" instructions for the modules it says that the modules are not graded on correctness. Does that mean that they are graded on completeness? Or are they just study tools for the class that are not included in the final grade?

CHEMISTRY COMMUNITY

Search found 17 matches

Re: Polarizability

Methane vs Carbon tetrachloride

Re: Test 3

Re: Carbon and Sulfur electronegativity?

Re: Clarification on Spin Quantum Number

3d orbital

4s orbital

Re: Balmer Series vs Lyman Series

Re: Quiz 2 [ENDORSED]

Re: h-bar [ENDORSED]

Re: Planck's constant [ENDORSED]

Re: Electromagnetic Field [ENDORSED]

Re: What is the speed of life though

Re: Value of speed of light [ENDORSED]

Test #1

Re: How to Find Net Amount of Gas Produced? - Pre-Class Assessment [ENDORSED]

Modules