Search found 41 matches

by Yadira Flores 1G
Mon Jun 11, 2018 9:49 pm
Forum: Administrative Questions and Class Announcements
Topic: Review Sessions Finals Week - Hedrick Hall? [ENDORSED]
Replies: 6
Views: 399

Re: Review Sessions Finals Week - Hedrick Hall? [ENDORSED]

So will the review sessions usually in Hedrick Hall continue on Tuesday and Wednesday?
by Yadira Flores 1G
Fri Jun 08, 2018 12:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: formal charge and VSEPR
Replies: 8
Views: 263

Re: formal charge and VSEPR

You would subtract one.
by Yadira Flores 1G
Wed Jun 06, 2018 10:37 pm
Forum: Bronsted Acids & Bases
Topic: J11c
Replies: 4
Views: 274

Re: J11c

For the question overall why is it that they didn't specify whether they wanted the Lewis or Bronsted acid or base? Does it matter?
by Yadira Flores 1G
Wed Jun 06, 2018 9:30 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 5
Views: 173

Re: Polydentate

We were told only to know three specific polydentates, correct?
by Yadira Flores 1G
Tue Jun 05, 2018 10:47 am
Forum: Dipole Moments
Topic: determining dipole moment
Replies: 3
Views: 230

Re: determining dipole moment

Yes looking at the difference in electronegativity will help to determine which which, if any, the dipole moment will move towards as well as if they will cancel. If they do, then it's non-polar and if they don't it's polar.
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by Yadira Flores 1G
Mon Jun 04, 2018 9:13 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Hybridization
Replies: 7
Views: 261

Re: Hybridization

I think in general we have to be able to figure out the hybridization of compounds when they are given, and memorizing which hybridizations go with each VSEPR shape can only help.
by Yadira Flores 1G
Thu May 31, 2018 9:13 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Problem 4.9
Replies: 3
Views: 122

Re: Problem 4.9

The 2 lone pairs on the I in the lewis structure does not allow for the shape to correspond to trigonal planar nor trigonal pyramidal. The VSEPR formula of AX3E2 corresponds to the t-shape.
by Yadira Flores 1G
Wed May 30, 2018 9:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Drawing
Replies: 7
Views: 246

Re: VSEPR Drawing

I think we're expected to be able to tell the VSEPR formula, the shape, the bond angles, hybridization, and the lewis structures based on the homework problems assigned to us.
by Yadira Flores 1G
Tue May 29, 2018 11:55 am
Forum: Electronegativity
Topic: HW question 3.77
Replies: 3
Views: 245

Re: HW question 3.77

I think it has largely to do with the fact that your comparing electronegativities between H and F, and because F is the most electronegative element it should be the most electronegative. Also I checked the electronegativity chart because they are pretty close to one another and the difference is b...
by Yadira Flores 1G
Tue May 29, 2018 9:55 am
Forum: Lewis Acids & Bases
Topic: Boron and the octet rule [ENDORSED]
Replies: 7
Views: 319

Re: Boron and the octet rule [ENDORSED]

I think it's all the elements in group 13.
by Yadira Flores 1G
Fri May 25, 2018 10:02 am
Forum: Lewis Structures
Topic: Multiple Compounds (3.41)
Replies: 3
Views: 105

Re: Multiple Compounds (3.41)

I always begin by drawing each element in the order it was given. So for your first example Carbon is given first so I would draw the carbon with the O bonded to it, this being because H tends to only make one bond so it'd be unlikely all four would be in a linear form. So, I would have a carbon who...
by Yadira Flores 1G
Wed May 23, 2018 10:16 pm
Forum: Lewis Structures
Topic: Homework Problem 3.65
Replies: 3
Views: 111

Re: Homework Problem 3.65

I would try and remember that Oxygen usually tends to make two bonds in order to acquire the formal charge of zero
by Yadira Flores 1G
Tue May 22, 2018 10:27 am
Forum: Lewis Structures
Topic: 3.39
Replies: 5
Views: 197

Re: 3.39

I'm still not getting how you would get the correct lewis structure for a. Can anyone explain?
by Yadira Flores 1G
Tue May 22, 2018 10:17 am
Forum: Lewis Structures
Topic: 3.39 bracket question
Replies: 2
Views: 96

Re: 3.39 bracket question

I think you would place the brackets around the whole compound too because the charge has to do with the entire compound.
by Yadira Flores 1G
Sun May 20, 2018 11:28 am
Forum: Resonance Structures
Topic: HW problem 3.45
Replies: 4
Views: 200

Re: HW problem 3.45

Why when doing the resonance structure can we not give Cl-N a double bond? Or can we?
by Yadira Flores 1G
Wed May 16, 2018 8:28 pm
Forum: Ionic & Covalent Bonds
Topic: Naming Molecules
Replies: 5
Views: 121

Re: Naming Molecules

I remember him saying he's not one to emphasize remembering the names of molecules, more understanding the concept of their structures.
by Yadira Flores 1G
Tue May 15, 2018 11:00 am
Forum: Ionic & Covalent Bonds
Topic: 3.33 b
Replies: 2
Views: 117

Re: 3.33 b

If you calculate the formal charge for the lewis structures of the two you have you will also be able to see that the correct Lewis structure equals zero, meaning its the most stable, therefore the correct one. Hope that helps.
by Yadira Flores 1G
Tue May 15, 2018 10:00 am
Forum: Octet Exceptions
Topic: OCTET RULE [ENDORSED]
Replies: 10
Views: 356

Re: OCTET RULE [ENDORSED]

I always think of the octet rule as, most, elements always wanting a full 8 electrons to be as stable as possible. They all want to be full like the noble gases.
by Yadira Flores 1G
Sun May 13, 2018 3:17 pm
Forum: Octet Exceptions
Topic: expanded octet XeF4
Replies: 8
Views: 355

Re: expanded octet XeF4

Expanded octet can only be used depending on the element's place on the periodic table, only if the element is after the 2nd row. F is on the second row, therefore cannot have an expanded octet.
by Yadira Flores 1G
Wed May 09, 2018 4:02 pm
Forum: Ionic & Covalent Bonds
Topic: Memorization of Electronegativity
Replies: 6
Views: 319

Re: Memorization of Electronegativity

Electronegativity increases across because the element is closer to have a filled orbital. It then decreases down because the valence electrons are further away.
by Yadira Flores 1G
Wed May 09, 2018 11:36 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Test 2 Q.4
Replies: 3
Views: 241

Re: Test 2 Q.4

I have the problem worked out, would it be possible for anyone to work out the steps? Just want to make sure I did it correctly.
by Yadira Flores 1G
Tue May 08, 2018 12:44 pm
Forum: DeBroglie Equation
Topic: test 2, question5
Replies: 5
Views: 336

Re: test 2, question5

Why are suppose to use Avogadro's number for this problem?
by Yadira Flores 1G
Sun May 06, 2018 10:42 pm
Forum: SI Units, Unit Conversions
Topic: #9 on Midterm Practice Review (unicorn)
Replies: 4
Views: 281

Re: #9 on Midterm Practice Review (unicorn)

Also I always convert the given mL to L and do the calculations, unless it specifically states the answer is wanted in mL. Also, he posted the answers under the topic and the answer he gave had the final units in L.
by Yadira Flores 1G
Wed May 02, 2018 6:08 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Post Assessment Question
Replies: 1
Views: 159

Post Assessment Question

42. An excited hydrogen atom emits light with a frequency of 1.14 x 1014 Hz to reach the energy level n = 4. In what principle quantum level did the electron begin?

Can anyone explain the steps needed to solve this problem? I'm having trouble starting because only one n value was given.
by Yadira Flores 1G
Wed May 02, 2018 4:40 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energy
Replies: 4
Views: 170

Re: Ionization Energy

Pretty sure we're focusing on the position it has on the periodic table and not specifically by any value.
by Yadira Flores 1G
Wed May 02, 2018 12:13 pm
Forum: Quantum Numbers and The H-Atom
Topic: Question 2.19 b.
Replies: 5
Views: 248

Re: Question 2.19 b.

I had a question about part a of this problem. The question states: "How many values of the quantum number l are possible when n=7? Since l=0,1,2,..n-l is my answer of seven correct? I'm just confused because I know l indicates the subshell and because we have not talked about those above l=3(f...
by Yadira Flores 1G
Sat Apr 28, 2018 7:51 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron Spin [ENDORSED]
Replies: 4
Views: 144

Re: Electron Spin [ENDORSED]

I'm pretty sure because each electron has a different interaction based on each state, the +1/2 and -1/2 account for the spin up and spin down
by Yadira Flores 1G
Tue Apr 24, 2018 10:43 pm
Forum: Einstein Equation
Topic: Chapter 1 Question 25 [ENDORSED]
Replies: 4
Views: 369

Re: Chapter 1 Question 25 [ENDORSED]

So for part c since we already know the 1.00 mol of Na would we just multiply by Avogadro's number and by the E we found in a? or just by Avogadro's number?
by Yadira Flores 1G
Mon Apr 23, 2018 11:43 pm
Forum: Einstein Equation
Topic: Homework number 1.25a [ENDORSED]
Replies: 3
Views: 222

Re: Homework number 1.25a [ENDORSED]

What units would the final answer be in?
by Yadira Flores 1G
Mon Apr 23, 2018 4:05 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Homework Questions for Week IV
Replies: 3
Views: 117

Homework Questions for Week IV

Should homework questions that will be turned into our TA's this week be strictly from the list of Ch.1 questions Dr. Lavelle emailed us?
by Yadira Flores 1G
Sat Apr 21, 2018 8:36 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Homework 1.13 [ENDORSED]
Replies: 3
Views: 149

Re: Homework 1.13 [ENDORSED]

You can also use the formula En= -hR/n^2 which Dr. Lavelle used in one of the previous lectures too right?
by Yadira Flores 1G
Sat Apr 21, 2018 7:55 pm
Forum: Properties of Light
Topic: HW #1.7
Replies: 5
Views: 338

Re: HW #1.7

I'm still having trouble with the conversion part of the question. Can anyone show me the steps for the conversion?
by Yadira Flores 1G
Sat Apr 21, 2018 10:40 am
Forum: Photoelectric Effect
Topic: Photoelectric effect pre-assessment module [ENDORSED]
Replies: 2
Views: 105

Re: Photoelectric effect pre-assessment module [ENDORSED]

I have tried to see if there's a way but I don't think it allows us to see the answers we got correct on any pre-assessments, only on the post-assessment does it show you.
by Yadira Flores 1G
Sat Apr 21, 2018 10:33 am
Forum: Properties of Light
Topic: Wavelengths
Replies: 8
Views: 250

Re: Wavelengths

Yes, In discussion my TA suggested we know the order of increasing wavelengths which would also help in knowing the frequency since they are inverse of one another.
by Yadira Flores 1G
Tue Apr 17, 2018 11:06 am
Forum: DeBroglie Equation
Topic: Ch.1 #41 [ENDORSED]
Replies: 6
Views: 473

Re: Ch.1 #41 [ENDORSED]

You have to convert the picometers into meters before plugging it into the equation right?
by Yadira Flores 1G
Sun Apr 15, 2018 2:19 pm
Forum: DeBroglie Equation
Topic: Midterm Question: wavelike properties
Replies: 6
Views: 298

Re: Midterm Question: wavelike properties

I think it's meaning that in order to have 'measurable wavelike properties' it has to be within the range of the electromagnetic spectrum.
by Yadira Flores 1G
Sun Apr 15, 2018 2:14 pm
Forum: Properties of Light
Topic: Properties of Light [ENDORSED]
Replies: 5
Views: 190

Re: Properties of Light [ENDORSED]

A quantum of light of wavelength is the minimum amount of energy which can be stored in an electromagnetic wave at that wavelength, which is Planck's constant h times the frequency. (E=hv)
by Yadira Flores 1G
Wed Apr 11, 2018 10:28 pm
Forum: Limiting Reactant Calculations
Topic: What is the mass of AgCl produced?
Replies: 10
Views: 2795

Re: What is the mass of AgCl produced?

I am stuck on this problem too. I found the mol of C6H9Cl3 to be 0.004 and then continued by multiplying that my 3molAgNO3/1molC6H9Cl3 and got 0.012molAgNO3 so then I multiplied that by the molar mass 169.88g of AgNO3 but my answer isn't correct. Can anyone help?
by Yadira Flores 1G
Tue Apr 10, 2018 3:21 pm
Forum: Molarity, Solutions, Dilutions
Topic: Post Assessment Question
Replies: 2
Views: 125

Post Assessment Question

A solution is prepared by dissolving 55.1 g of KCl in approximately 75 mL of water and then adding water to a final volume of 125 mL. What is the molarity of KCl(aq) in this solution? Why isn't it correct to apply the M1V1=M2V2 to this specific problem?
by Yadira Flores 1G
Thu Apr 05, 2018 4:29 pm
Forum: Limiting Reactant Calculations
Topic: M.15
Replies: 5
Views: 2823

Re: M.15

For the top answer in part b) when finding the limiting reagent I got 9.45mol for Al and 7.55mol for Cl2 but noticed that in the above posted answer they got 8.33mol. Did I make a calculation error?
by Yadira Flores 1G
Thu Apr 05, 2018 10:12 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E.27
Replies: 2
Views: 122

E.27

Im having trouble with part b of the question. I found the grams in the H2O molecule to be 2.992x10^-23 but don't know how to approach finding the molecule number.

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