Search found 32 matches

by Madeleine Farrington 1B
Wed Jun 13, 2018 10:01 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Table 17.4
Replies: 1
Views: 170

Table 17.4

Part of the reading includes table 17.4 that lists the common ligands. Do we have to memorize these ligands, or just familiarize ourselves with them?
by Madeleine Farrington 1B
Sun Jun 10, 2018 9:26 pm
Forum: Hybridization
Topic: basics of hybridization
Replies: 18
Views: 632

Re: basics of hybridization

I found this video extremely helpful in explaining how to determine the hybridization of orbitals in a molecule.
[youtube]https://www.youtube.com/watch?v=4xl0BD-tMeA[/youtube]
by Madeleine Farrington 1B
Sun Jun 10, 2018 8:01 pm
Forum: Octet Exceptions
Topic: expanded octet
Replies: 12
Views: 530

Re: expanded octet

Allen Chen 1J wrote:Any elements with unfilled d orbitals can have expanded octet.

Wait so if an element has a d-orbital but it is filled (ie As = [Ar]3d104s24p3) then it can't have an extended octet? Does this mean that only the transition metals can have an extended octet?
by Madeleine Farrington 1B
Sun Jun 10, 2018 7:30 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Sigma vs Pi Bonds
Replies: 4
Views: 246

Sigma vs Pi Bonds

Are all bonds involving the p-orbital Pi bonds? If not, how do you tell if a bond is a Pi bond or a Sigma bond?
by Madeleine Farrington 1B
Sun Jun 03, 2018 10:30 pm
Forum: Hybridization
Topic: Differences Between Pi and Sigma bonds
Replies: 7
Views: 223

Re: Differences Between Pi and Sigma bonds

So, in relation to sigma and pie bonds, does each increase in bond length constrain the molecule on an increasing number of axis(s)? That is, a sigma bond just constrains it on an axis, a pi bond would not allow it to rotate, and a triple bond would mean even more constraints in molecular movement?...
by Madeleine Farrington 1B
Sun Jun 03, 2018 9:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw Shape
Replies: 4
Views: 159

Seesaw Shape

In class Dr. Lavelle discussed and modeled the seesaw shape, explaining that it had a single lone pair of electrons and then four sets of bonded electrons with other molecules. He teetered the model back and forth, explaining that this was where the shape got its name, but I am confused about why th...
by Madeleine Farrington 1B
Mon May 21, 2018 11:09 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: HW 3.83
Replies: 6
Views: 703

Re: HW 3.83

I am confused for 3.83 why the polarizability of N3- is greater than O2-. I know that polarizability increases as an ion gets larger and less electronegative, but if both of these anions are in the same row of the table and have a full valence with the added electrons, aren't they the same size?
by Madeleine Farrington 1B
Mon May 21, 2018 10:17 pm
Forum: Octet Exceptions
Topic: 3.67 ClO2 Structure and Minimizing Formal Charge
Replies: 2
Views: 314

Re: 3.67 ClO2 Structure and Minimizing Formal Charge

I'm also confused why, for this question, the answer manual puts the unpaired electron on Cl rather than on one of the O atoms. Wouldn't it minimize formal charge more to put it on the O atom?
by Madeleine Farrington 1B
Mon May 21, 2018 10:06 pm
Forum: Lewis Structures
Topic: Spacing in Structure for Molecules with an Expanded Octet
Replies: 1
Views: 93

Spacing in Structure for Molecules with an Expanded Octet

When drawing a lewis structure with an expanded octet where there are additional lone pairs around the central atom, is the spacing important? For example question 3.65 asks you to draw the Lewis Structure for XeF 4 . There are 36 e- between these atoms, so when you draw the lewis structure there wi...
by Madeleine Farrington 1B
Sun May 20, 2018 4:14 pm
Forum: Ionic & Covalent Bonds
Topic: Monatomic Anions and cations
Replies: 2
Views: 201

Monatomic Anions and cations

Section 3.1 of the textbook brings up monatomic anions and cations, but doesn't really define the word "monatomic." Is this any different than a regular anion or cation? What does "moatomic" mean?
by Madeleine Farrington 1B
Sun May 20, 2018 3:17 pm
Forum: Octet Exceptions
Topic: Question 3.63 part b
Replies: 2
Views: 154

Question 3.63 part b

3.36 b) Write the Lewis structure for each of the following molecules or ions and give the number of electrons about each central atom: b) XeF 2 Why would Xe bond where it needs to use an extended octet when it already has 8 valence electrons making it very stable already? Isn't an extended octet le...
by Madeleine Farrington 1B
Sun May 20, 2018 3:06 pm
Forum: Octet Exceptions
Topic: Expanded Octet Rules
Replies: 7
Views: 493

Re: Expanded Octet Rules

When given a molecule with an atom in it with the possibility for an expanded octet and asked to draw the Lewis structure, is there any intuitive trick to determine if an expanded octet is actually needed other than guess and check? For example, question 3.63 part a asks you to draw the Lewis Struct...
by Madeleine Farrington 1B
Sun May 13, 2018 9:49 pm
Forum: Octet Exceptions
Topic: expanded octet XeF4
Replies: 8
Views: 349

Re: expanded octet XeF4

I understand that for this example, the additional electrons go around Xe because Xe has a d-orbital, enabling an expanded octet, whereas F does not, but in a case where more than one atom in a molecule had a d-orbital, how would you know which atom to draw those extra electrons around?
by Madeleine Farrington 1B
Wed May 09, 2018 10:24 am
Forum: Empirical & Molecular Formulas
Topic: Test #1 Question 7 mass percentage
Replies: 2
Views: 328

Re: Test #1 Question 7 mass percentage

I had a slightly different test I think, and the values given for mine were 8.45g CO2 and 1.73g H2O. When I divided each by their respective molar masses, I got 0.192 mol CO2 and 0.096 mol H2O. Since these values are not equal but .192/.096 = 2, does that mean that in the molecular formula for my pr...
by Madeleine Farrington 1B
Wed May 09, 2018 10:17 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Module Question 23
Replies: 2
Views: 189

Re: Module Question 23

Yup! The first time I did it with the value 5, but after seeing your reply and doing it with delta x=10, I got 2.45 * 10^-39 m.s^-1
by Madeleine Farrington 1B
Wed May 09, 2018 9:20 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Module Question 23
Replies: 2
Views: 189

Module Question 23

Question Reads: You are caught in a radar trap and hope to show that the speed measured by the radar gun is in error due to the Heisenberg uncertainty principle. If you assume that the uncertainty in your position was +/- 5 m when your speed was measured, and that the car has a mass of 2150 kg, what...
by Madeleine Farrington 1B
Sun May 06, 2018 10:11 pm
Forum: Trends in The Periodic Table
Topic: Trends to Know
Replies: 12
Views: 483

Re: Trends to Know

Another trend is electron affinity. Electron affinity tells how how much energy must either be supplied (-) or is released(+) when an electron attaches to an atom. It generally increases as you move right and up along the periodic table. However, noble gases in group 18 have low ones because they'r...
by Madeleine Farrington 1B
Sun May 06, 2018 8:30 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2.25 [ENDORSED]
Replies: 3
Views: 162

Re: 2.25 [ENDORSED]

I was initially confused about this as well, but I think the key word in this question is "can," meaning what is the maximum possible electrons that can occupy the following orbitals. So, while it is possible to have 1 electron in an s-orbital, the most the s-orbital could hold would be 2 ...
by Madeleine Farrington 1B
Mon Apr 30, 2018 4:32 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: ∆P and ∆X
Replies: 5
Views: 223

Re: ∆P and ∆X

Interesting to note that in the Heisenberg principle, because these two values (∆P and ∆X) multiplied together must be less than a constant \frac{1}{2} * \frac{h}{2\pi } if either uncertainty is very small, than the other uncertainty must be very big. This can help on homework and tests when making ...
by Madeleine Farrington 1B
Sun Apr 29, 2018 9:40 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: What does electron spin actually mean? [ENDORSED]
Replies: 9
Views: 377

Re: What does electron spin actually mean? [ENDORSED]

Professor Lavelle said in class that when electrons can, they will spread out to occupy different orbitals, and that when this happens they have the same spin. Why is it possible for 2 e- that are parallel to have the same spin if 2e- that are paired must have opposite spins?
by Madeleine Farrington 1B
Sun Apr 29, 2018 9:31 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: understanding orbitals [ENDORSED]
Replies: 8
Views: 229

Re: understanding orbitals [ENDORSED]

AnthonyDis1A wrote:I think that each plane shows the path with the highest probability of (specifically) the two electrons in that particular orbital.


Does this mean that electrons are confined to one orbital and cannot move between, for example, px, py, pz?
by Madeleine Farrington 1B
Sun Apr 29, 2018 9:25 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: The concept of Orbitals
Replies: 12
Views: 306

Re: The concept of Orbitals

What determines which of the orbitals have or don't have nodal planes?
by Madeleine Farrington 1B
Mon Apr 23, 2018 5:08 pm
Forum: Properties of Light
Topic: Test 2 Material
Replies: 12
Views: 413

Re: Test 2 Material

Will accurate use of significant figures be graded on test 2?
by Madeleine Farrington 1B
Sun Apr 22, 2018 11:22 pm
Forum: Properties of Light
Topic: Difference between wave model and particle model? [ENDORSED]
Replies: 6
Views: 2235

Re: Difference between wave model and particle model? [ENDORSED]

Simply put, the wave model and particle model are just two ways of conceptualizing how light moves and interacts with things. The particle model comes in handy in understanding why increasing intensity of long wave-length light in the photoelectric experiment fails to cause emission of electrons, be...
by Madeleine Farrington 1B
Sun Apr 22, 2018 11:08 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Emission vs Absorption
Replies: 3
Views: 139

Emission vs Absorption

I notice that most of the homework problems offer the wavelength of light emitted as part of the given information, but I know you can also measure wavelength of light absorbed. Is there a difference in how you solve a given problem if it offers the wavelength of light absorbed rather than emitted?
by Madeleine Farrington 1B
Sun Apr 22, 2018 11:02 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: HW 1.27
Replies: 2
Views: 155

HW 1.27

Question 27 of chapter 1 reads: A lamp rated at 32 W (1W = 1 J.s^-1) emits violet light of wavelength 420nm. How many photons of violet light can the lamp generate in 2.0s? How many moles of photons are emitted in that time interval? I understand how to calculate Energy per photon, but how do you de...
by Madeleine Farrington 1B
Sun Apr 15, 2018 1:49 pm
Forum: Properties of Light
Topic: Help on 1.9 [ENDORSED]
Replies: 4
Views: 182

Re: Help on 1.9 [ENDORSED]

You can figure out which event goes with which row by considering the electromagnetic spectrum and determining which type of radiation each activity would expose you to. Making microwave popcorn would expose you to microwaves, a sun tan would expose you to UV radiation, and an x-ray would expose you...
by Madeleine Farrington 1B
Fri Apr 13, 2018 7:27 pm
Forum: Properties of Light
Topic: HW 1.3 [ENDORSED]
Replies: 12
Views: 455

Re: HW 1.3 [ENDORSED]

I understand why C is correct in the ways that the people above have explained it, but the solution manual says that "The electrical field corresponds to the amplitude; as the frequency decreases the waves broaden and the extent of the change (the slope of the wave) decreases." Why does th...
by Madeleine Farrington 1B
Fri Apr 13, 2018 7:13 pm
Forum: *Black Body Radiation
Topic: Black Body? [ENDORSED]
Replies: 13
Views: 1204

Re: Black Body? [ENDORSED]

When you say that black bodies absorb all light, do you mean all light in the visible spectrum, or the entire electromagnetic spectrum?
by Madeleine Farrington 1B
Fri Apr 06, 2018 12:42 pm
Forum: Significant Figures
Topic: E29 Textbook Answer [ENDORSED]
Replies: 1
Views: 130

E29 Textbook Answer [ENDORSED]

Question E.29 part d reads: A chemist measured out 8.61 g of copper(II) chloride tetrahydrate, CuCl2 * 4H2). d) What fraction of the total mass of the samplewas due to oxygen? The answer manual lists the answer as 0.3099 because they used 16.00g.mol^-1 as the molar mass for oxygen. I used 15.999g.mo...
by Madeleine Farrington 1B
Fri Apr 06, 2018 12:33 pm
Forum: Molarity, Solutions, Dilutions
Topic: G.5 [ENDORSED]
Replies: 3
Views: 169

Re: G.5 [ENDORSED]

I also had trouble with part C of this problem. G.5.c: A student prepared a solution of sodium carbonate by adding 2.111g of the solid to a 250.0 mL volumetric flask and adding water to the mark. Some of this solution was transferred to a buret. What volume of solution should the student transfer in...
by Madeleine Farrington 1B
Fri Apr 06, 2018 12:18 pm
Forum: Empirical & Molecular Formulas
Topic: Determining Molecular Formula Based on Name of Molecule [ENDORSED]
Replies: 5
Views: 201

Determining Molecular Formula Based on Name of Molecule [ENDORSED]

Several questions in the homework list just the name of the molecule. ie question M7 in the text reads: "Solid Boron can be extracted from solid boron oxide by reaction with magnesium metal at a high temperature. A second product is solid magnesium oxide. (a) write a balanced equation for the r...

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