Search found 17 matches

by Josian1A
Sun Jun 03, 2018 11:09 pm
Forum: Ionic & Covalent Bonds
Topic: Polarizability
Replies: 7
Views: 285

Re: Polarizability

What determines the size of the electron cloud?
by Josian1A
Sun May 20, 2018 4:27 pm
Forum: Dipole Moments
Topic: Methane vs Carbon tetrachloride
Replies: 1
Views: 53

Methane vs Carbon tetrachloride

We did this example in class but I'm still a bit confused. Why does CCl4 have a significantly higher boiling point than CH4?
by Josian1A
Sun May 20, 2018 3:49 pm
Forum: Bond Lengths & Energies
Topic: Test 3
Replies: 8
Views: 253

Re: Test 3

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.
by Josian1A
Sun May 20, 2018 3:37 pm
Forum: Electronegativity
Topic: Carbon and Sulfur electronegativity?
Replies: 4
Views: 1979

Re: Carbon and Sulfur electronegativity?

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...
by Josian1A
Fri May 04, 2018 11:48 am
Forum: Quantum Numbers and The H-Atom
Topic: Clarification on Spin Quantum Number
Replies: 4
Views: 180

Re: Clarification on Spin Quantum Number

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...
by Josian1A
Fri May 04, 2018 11:18 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 3d orbital
Replies: 3
Views: 138

3d orbital

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.
by Josian1A
Fri May 04, 2018 11:09 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 4s orbital
Replies: 2
Views: 68

4s orbital

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 ...
by Josian1A
Sat Apr 21, 2018 12:44 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Balmer Series vs Lyman Series
Replies: 4
Views: 483

Re: Balmer Series vs Lyman Series

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.
by Josian1A
Sat Apr 21, 2018 12:35 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Quiz 2 [ENDORSED]
Replies: 4
Views: 128

Re: Quiz 2 [ENDORSED]

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...
by Josian1A
Sat Apr 21, 2018 12:13 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: h-bar [ENDORSED]
Replies: 7
Views: 268

Re: h-bar [ENDORSED]

I was also confused between the practicality of using instead of . What is the difference between the two?
by Josian1A
Sun Apr 15, 2018 5:52 pm
Forum: Einstein Equation
Topic: Planck's constant [ENDORSED]
Replies: 3
Views: 189

Re: Planck's constant [ENDORSED]

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...
by Josian1A
Fri Apr 13, 2018 3:49 pm
Forum: Properties of Electrons
Topic: Electromagnetic Field [ENDORSED]
Replies: 7
Views: 257

Re: Electromagnetic Field [ENDORSED]

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...
by Josian1A
Fri Apr 13, 2018 3:40 pm
Forum: Properties of Light
Topic: What is the speed of life though
Replies: 3
Views: 178

Re: What is the speed of life though

its a song by David Bowie
by Josian1A
Fri Apr 13, 2018 3:32 pm
Forum: Properties of Light
Topic: Value of speed of light [ENDORSED]
Replies: 4
Views: 170

Re: Value of speed of light [ENDORSED]

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.
by Josian1A
Sun Apr 08, 2018 3:24 pm
Forum: Administrative Questions and Class Announcements
Topic: Test #1
Replies: 1
Views: 84

Test #1

Just need some clarification. The test will be held in discussion, correct?
by Josian1A
Sun Apr 08, 2018 3:20 pm
Forum: Balancing Chemical Reactions
Topic: How to Find Net Amount of Gas Produced? - Pre-Class Assessment [ENDORSED]
Replies: 1
Views: 113

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

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)
by Josian1A
Fri Apr 06, 2018 11:32 am
Forum: Administrative Questions and Class Announcements
Topic: Modules
Replies: 5
Views: 210

Modules

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?

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