## Search found 15 matches

Sun Nov 01, 2020 10:51 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 173
Views: 34045

### Re: Final Jitters

Make sure you're as prepared as possible and not just with the material but also your workspace. Especially with online testing, making sure you have a good connection, a quiet place, all your materials, etc. Knowing that you're prepared can help ease a lot of anxiety. Don't try to last-minute cram ...
Sun Nov 01, 2020 10:39 pm
Forum: Trends in The Periodic Table
Topic: Electron affinity and Ionization energy
Replies: 7
Views: 51

### Re: Electron affinity and Ionization energy

Ionization energy is the energy required to remove an electron away from an atom

Electron affinity is the energy released when an electron is added to the atom
Sun Nov 01, 2020 10:35 pm
Forum: Properties of Electrons
Topic: Sapling 23
Replies: 2
Views: 22

### Re: Sapling 23

First, you need to determine E using E = hc/wavelength (use 1064x10^-9) for wavelength. You would get 1.867x10^-19. Then you use the conversion for Joules to eV by dividing E by 1.602x10^-19 to get 1.165eV. Electron affinity is the difference between the incident radiation from the laser and the mea...
Sun Nov 01, 2020 10:32 pm
Forum: Trends in The Periodic Table
Topic: sapling #23
Replies: 6
Views: 19

### Re: sapling #23

First, you need to determine E using E = hc/wavelength (use 1064x10^-9) for wavelength. You would get 1.867x10^-19. Then you use the conversion for Joules to eV by dividing E by 1.602x10^-19 to get 1.165eV. Electron affinity is the difference between the incident radiation from the laser and the mea...
Sun Nov 01, 2020 8:59 pm
Forum: Trends in The Periodic Table
Topic: Tips for remembering
Replies: 14
Views: 51

### Re: Tips for remembering

For me, I know that electronegativity increases going up and to the right. From there you can start to derive other trends since periodic trends(effective nuclear charge, affinity, ionization energy, etc) are related. I'd recommend knowing the relationships between these/the fundamentals behind them...
Sun Oct 25, 2020 10:27 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Bonds
Replies: 9
Views: 47

### Re: Covalent Bonds

In order of greatest strength to least strength, it goes: ionic, covalent, hydrogen The reason ionic bonds tend to be stronger than covalent bonds is due to the coulombic attraction between ions of opposite charges. An electron is "taken" from one atom by another atom. In covalent bonds, a...
Sun Oct 25, 2020 9:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Office Hours before midterms
Replies: 2
Views: 31

### Office Hours before midterms

Is Professor Lavelle still gonna have office hours this week before the midterm? Also, can you only go to your TA's office hours or can you go to others? And for the camera pointed at our station does it have to be raised so they can see the work on the paper or just level with the desk so they can ...
Sun Oct 25, 2020 9:48 pm
Forum: Administrative Questions and Class Announcements
Topic: what can we have during the midterm?
Replies: 5
Views: 26

### Re: what can we have during the midterm?

he sent us two sheets(via email) which im sure you can find on his website to print out that we can use plus a calculator but that's it
Sat Oct 24, 2020 10:52 pm
Forum: Administrative Questions and Class Announcements
Topic: Printouts for Midterm
Replies: 8
Views: 60

### Re: Printouts for Midterm

He sent us two worksheets(via email) to print out but besides those, I don't think anything else is allowed.
Sat Oct 24, 2020 10:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Webcam for Midterms [ENDORSED]
Replies: 4
Views: 56

### Re: Webcam for Midterms[ENDORSED]

Yeah, I think we just have zoom open on a separate device and point it at our workspace. Also, Respondus uses your camera to record your face right? so there's no need to have a separate camera at your face. I'm not 100% sure about this though
Sat Oct 10, 2020 12:03 am
Forum: Empirical & Molecular Formulas
Topic: Chapter M Exercise 19
Replies: 4
Views: 32

### Re: Chapter M Exercise 19

1. Convert grams of CO2, H2O, and N2 to moles. (You do this by dividing the number of grams by the molar mass of each compound) ex: mols of CO2=0.376g/(44.01g/mol)=.0155 mols of CO2 2. Convert mol of CO2, H2O, and N2 to mol of JUST C, H, and N(elements in caffeine). To do this you must multiply the ...
Fri Oct 09, 2020 11:26 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Syllabus Problem 1A.9 The Quantum World
Replies: 2
Views: 37

### Syllabus Problem 1A.9 The Quantum World

I was working on the syllabus practice problems and just wanted some clarification, please. 1A.9 A college student recently had a busy day. Each of the student’s activities on that day (reading, getting a dental x-ray, making popcorn in a microwave oven, and acquiring a suntan) involved radiation fr...
Thu Oct 08, 2020 7:16 pm
Forum: Significant Figures
Topic: How to deal with significant figures in decimals with zeros.
Replies: 20
Views: 146

### Re: How to deal with significant figures in decimals with zeros.

If there are zeros "sandwiched" between two numbers, they are always included when counting sig figs. So for example, 2001, 2.001 and 20.01 all have 4 sig figs. Zeros in front of the decimal never count, so .002 or 0.000002 only have one sig fig. And if there are trailing zeros, they only ...
Thu Oct 08, 2020 7:08 pm
Forum: Balancing Chemical Reactions
Topic: Question H 7d
Replies: 3
Views: 34

### Re: Question H 7d

I think sometimes a catalyst is written above/below the arrow but it's not included with the reactants or products when you write the actual chemical reaction.
Thu Oct 08, 2020 6:55 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 221
Views: 115592

### Re: Advice from a Medical Student[ENDORSED]

I just found this thread thanks to Professor Lavelle's email and I wouldn't have known about it if it wasn't for you guys activating it again so thanks. Ashley's path is basically my ideal path and it's really comforting to see that this class helped so much despite it's difficult. I'll definitely t...