CHEMISTRY COMMUNITY

Madeleine Farrington 1B

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?

Madeleine Farrington 1B

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]

Madeleine Farrington 1B

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?

Madeleine Farrington 1B

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?

Madeleine Farrington 1B

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?...

Madeleine Farrington 1B

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...

Madeleine Farrington 1B

I am confused for 3.83 why the polarizability of N^3- is greater than O^2-. 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?

Madeleine Farrington 1B

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?

Madeleine Farrington 1B

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...

Madeleine Farrington 1B

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?

Madeleine Farrington 1B

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...

Madeleine Farrington 1B

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...

Madeleine Farrington 1B

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?

Madeleine Farrington 1B

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...

Madeleine Farrington 1B

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

Madeleine Farrington 1B

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...

Madeleine Farrington 1B

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...

Madeleine Farrington 1B

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 ...

Madeleine Farrington 1B

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 ...

Madeleine Farrington 1B

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?

Madeleine Farrington 1B

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?

Madeleine Farrington 1B

What determines which of the orbitals have or don't have nodal planes?

Madeleine Farrington 1B

Will accurate use of significant figures be graded on test 2?

Madeleine Farrington 1B

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...

Madeleine Farrington 1B

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?

Madeleine Farrington 1B

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...

Madeleine Farrington 1B

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...

Madeleine Farrington 1B

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...

Madeleine Farrington 1B

When you say that black bodies absorb all light, do you mean all light in the visible spectrum, or the entire electromagnetic spectrum?

Madeleine Farrington 1B

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...

Madeleine Farrington 1B

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...

Madeleine Farrington 1B

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...

CHEMISTRY COMMUNITY

Search found 32 matches

Table 17.4

Re: basics of hybridization

Re: expanded octet

Sigma vs Pi Bonds

Re: Differences Between Pi and Sigma bonds

Seesaw Shape

Re: HW 3.83

Re: 3.67 ClO2 Structure and Minimizing Formal Charge

Spacing in Structure for Molecules with an Expanded Octet

Monatomic Anions and cations

Question 3.63 part b

Re: Expanded Octet Rules

Re: expanded octet XeF4

Re: Test #1 Question 7 mass percentage

Re: Module Question 23

Module Question 23

Re: Trends to Know

Re: 2.25 [ENDORSED]

Re: ∆P and ∆X

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

Re: understanding orbitals [ENDORSED]

Re: The concept of Orbitals

Re: Test 2 Material

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

Emission vs Absorption

HW 1.27

Re: Help on 1.9 [ENDORSED]

Re: HW 1.3 [ENDORSED]

Re: Black Body? [ENDORSED]

E29 Textbook Answer [ENDORSED]

Re: G.5 [ENDORSED]

Determining Molecular Formula Based on Name of Molecule [ENDORSED]