## Search found 25 matches

Wed Jun 13, 2018 9:38 pm
Forum: Administrative Questions and Class Announcements
Replies: 11
Views: 966

### Re: Grading question

Florence-1F wrote:So does that mean that 250 up to 350 = C-?

yes, that is what someone said above.
Sun Jun 10, 2018 11:50 pm
Forum: Significant Figures
Topic: Calculations
Replies: 3
Views: 279

### Re: Calculations

To avoid getting a different answer, you should not round or alter significant figures until you complete the problem that you are doing!
Sun Jun 10, 2018 11:47 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs for Final
Replies: 8
Views: 561

### Re: Sig Figs for Final

Although significant figures did not matter on the first test, I'm pretty sure we are expected to be exact with our significant figures, just as we were on the midterm because it is something that we were taught in class.
Sun Jun 10, 2018 11:40 pm
Forum: Hybridization
Topic: pi bonds and sigma bonds [ENDORSED]
Replies: 4
Views: 389

### Re: pi bonds and sigma bonds[ENDORSED]

I am also having some trouble with pi and sigma bonds, but I found these two videos that helped me have a better understanding. I hope they help! https://www.youtube.com/watch?v=ree49ge4VA4&feature=youtu.be
Sun Jun 10, 2018 11:07 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: equation
Replies: 1
Views: 210

### Re: equation

I believe that the 2 came from balancing the equation; if there weren't a 2 next to OH, it would not be balanced correctly.
Sun Jun 10, 2018 9:59 pm
Forum: General Science Questions
Topic: Final [ENDORSED]
Replies: 10
Views: 744

### Re: Final[ENDORSED]

Should we focus on the new material or the old material more? Which one will be more heavily concentrated on the exam? I would assume that new material would be more heavily concentrated since we were already tested on old material, but as others have said, it may be a mix of questions, as it is cu...
Sun Jun 10, 2018 9:56 pm
Forum: General Science Questions
Topic: Final [ENDORSED]
Replies: 10
Views: 744

### Re: Final[ENDORSED]

I think that the final will cover everything we have learned in chemistry because it is cumulative.
Sun Jun 10, 2018 9:53 pm
Forum: Administrative Questions and Class Announcements
Replies: 11
Views: 966

### Re: Grading question

When I read this on the syllabus, I interpreted it as: if you get a 50% to less than 70%, it will be treated as if you got a C-. Because of this, I think 250 points does mean that you are guaranteed a C-, but I may have interpreted incorrectly.
Sun Jun 10, 2018 9:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 282
Views: 134912

### Re: Saying Thank You to Dr. Lavelle

Dear Dr. Lavelle, I appreciate all of the effort you put into helping all of your students succeed--all the resources that you provide truly do help. Also, your enthusiasm for teaching chemistry made me excited to go to class every time, even though chemistry can be tough sometimes. Thank you so muc...
Sun Jun 10, 2018 9:30 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Drawing coordination compounds
Replies: 2
Views: 191

### Re: Drawing coordination compounds

I don't think we will have to draw coordination compounds, but I'm pretty sure we should be able to know them!
Sun Jun 10, 2018 9:25 pm
Forum: Ideal Gases
Topic: Memorization
Replies: 12
Views: 558

### Re: Memorization

I do not think we have to memorize it, as it is a constant, so it will most likely be provided for us.
Sun Jun 10, 2018 9:21 pm
Forum: Properties of Electrons
Topic: Wave-like Properties of Electron
Replies: 5
Views: 317

### Re: Wave-like Properties of Electron

I don't think that there is an exact numerical cutoff, but the wavelength can not be extremely small because then it will not be able to be detected. For example, a wavelength of 1 x 10 -34 would be too small. I agree with the previous response that 1 x 10 -18 would be the smallest wavelength that c...
Sun Jun 03, 2018 11:02 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelate
Replies: 2
Views: 208

### Re: Chelate

I am confused about this too. In my notes, I wrote that chelate is a complex containing a ligand that forms a ring of atoms with a central metal atom, but I do not really understand what that means.
Sun Jun 03, 2018 10:54 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand terms
Replies: 2
Views: 168

### Re: Ligand terms

I think that mono-, bi-, tri-, and hexo- dentates are just the names of the ligands that have a certain amount of electron pairs. For example, mono dentate ligands only have one electron pair to donate. Bi dentate ligands have two electron pairs, tri dentates have three electron pairs, and hexo dent...
Sun Jun 03, 2018 5:36 pm
Forum: Hybridization
Topic: homework problem 4.35 part c
Replies: 2
Views: 159

### Re: homework problem 4.35 part c

I believe the lewis structure should look like this.
Sun May 20, 2018 5:18 pm
Forum: Lewis Structures
Topic: When to use lone pairs or bonds
Replies: 2
Views: 173

### Re: When to use lone pairs or bonds

I believe that you'd have to look at the formal charge to decide which to add; if the lewis structure has a lower formal charge with a double bond,then that should be added, and vice versa. I hope that helped!
Sun May 20, 2018 5:02 pm
Forum: Ionic & Covalent Bonds
Topic: 3.25 c)
Replies: 4
Views: 282

### Re: 3.25 c)

Hydrogen has a charge of +1, as it says on the periodic table.
Sun May 13, 2018 11:34 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions [ENDORSED]
Replies: 3
Views: 239

### Re: Exceptions[ENDORSED]

I am confused as to why there are exceptions for these elements as well. I would appreciate if someone explained this!
Sun May 13, 2018 10:26 pm
Forum: Resonance Structures
Topic: Resonance Structure Problems
Replies: 3
Views: 244

### Re: Resonance Structure Problems

Hi, on Friday, we were told that one structure would be sufficient unless we are specifically asked to give all the possible resonance structures. For your last question, I believe that it would be two different types of questions. I hope that helps!
Thu May 03, 2018 11:46 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2.25 [ENDORSED]
Replies: 3
Views: 229

### Re: 2.25[ENDORSED]

You're right, hydrogen can only have one electron, but in the s-orbital, you can have a two electrons. If you do electron configurations using the periodic table, you can see that the s-orbital, which is the first two columns, allows for a total of two electrons. I attached a picture to help visuali...
Sun Apr 29, 2018 11:27 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: orbitals
Replies: 3
Views: 235

### Re: orbitals

To add on to that, you can use Ar because its outer shell, along with the outer shells of the other noble gases, is full, which makes it easier to have Ar as the reference point. Hopefully that helps!
Thu Apr 26, 2018 7:30 pm
Forum: Properties of Electrons
Topic: Information Provided on Exam
Replies: 6
Views: 420

### Re: Information Provided on Exam

I took the test today, and we were not provided with the wavelengths. You should have a general idea of the sizes though--for example, x-rays<UV<visible light<infrared<microwaves. The front of the test only has constants and equations, as it did for the previous test.
Thu Apr 26, 2018 7:21 pm
Forum: Einstein Equation
Topic: converting from keV to joules
Replies: 7
Views: 416

### Re: converting from keV to joules

You do not have to worry about memorizing the conversion because it is given on the front of the test.
Sat Apr 21, 2018 11:15 pm
Forum: Limiting Reactant Calculations
Topic: Question from test 1 [ENDORSED]
Replies: 4
Views: 450

### Re: Question from test 1[ENDORSED]

Zuri Smith 1A wrote:Okay thank you! And just to reconfirm, the limiting reagent is basically just the reactant that has the smallest # of moles (and thus runs out the quickest)?

I would say that you are correct about the limiting reactant.
Wed Apr 18, 2018 10:15 pm
Forum: Properties of Electrons
Topic: Remembering hydrogen spectral series and associated radiation
Replies: 2
Views: 206

### Re: Remembering hydrogen spectral series and associated radiation

I am not sure about your first question, but for your second question, I would say that we have to remember what series matches with what radiation. I think Dr. Lavelle said that for tests, he'll give us constants and equations, but not that.

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