CHEMISTRY COMMUNITY

ErinKim1I

I'm not sure if bond angles really matter for a lewis structure... I was told that they are important mostly for VSEPR, b/c that represents a 3D space.

ErinKim1I

Just to add, coordination number typically applies to compounds with a transition metal as the central atom, so it isn't likely that you would encounter a double or triple bond in the first place.

ErinKim1I

Does anyone know if drawing coordination compounds will be a topic on the final? I know a couple topics regarding coordination compounds were taken out so I am just wondering. Thanks.

ErinKim1I

P has 4 areas of electron density because P has 3 bonding pairs AND a lone pair. Lone pairs are represented by both spin up and spin down.
so the answer is sp3 with the 3s orbital containing both a spin up and spin down, and the 3p orbital having 3 unpaired e-.

ErinKim1I

When a question asks for molecular shape, you have to take into account the number of areas of electron density, lone pairs, etc., not just the number of atoms.

ErinKim1I

I think coordination number is the number of immediate atoms surrounding a central atom whereas oxidation number is the number assigned to an atom to represent the # of electrons lost or gained

ErinKim1I

How do you know when hybridization is necessary/ takes place?

ErinKim1I

Is being "more likely to contribute to a resonance structure" the same as being the best/ most stable resonance structure?

ErinKim1I

When there is resonance, electrons are delocalized and so the bond length distribution is somewhere between the single and double bond in the structure.

ErinKim1I

I think about it this way: s-orbitals can hold 2 e- p-orbitals can hold 6 e- so s and p together can hold 8e-, which is an octet. But starting from row 3 of the periodic table, there is a d-orbital, and d-orbitals can hold up to 10e-. So if an element has s, p, and d orbitals, the electrons in the d...

ErinKim1I

Or if you look at the lewis structure an see an electron attached that is not in a pair, you can conclude that the structure is a radical.

ErinKim1I

I think the reason you are confused is because you have an incorrect definition of electron affinity. Since electron affinity is how much an element "wants" an electron, it only makes sense that the more an element wants an electron, the harder (greater energy) it will take to take an elec...

ErinKim1I

I keep getting 10^-31 instead of 10^-32, can someone help me figure out where I went wrong?

I converted the g to kg and made sure I used the right units..

ErinKim1I

Nevermind, I got it

ErinKim1I

Hi,

Can someone explain to me why the electron configuration of Ni3+ is [Ar] 3d^7, without the 4s orbitals filled up?

Thanks

ErinKim1I

2.37 asks: True or False? Zeff for an electron in a p-orbital is lower than for an electron in an s-orbital in the same shell. The statement is true, but I'm confused because I thought that as you go across a group (which would have the same shell), Zeff increases. Can someone explain where I went w...

ErinKim1I

How does a particle in a box model Schrodinger's equation? In another post, it said that this model explains energy quantization since the box has infinitely high walls. Wouldn't there need to be a discrete amount of energy needed to pass the walls? Or does this model explain quantization in that th...

ErinKim1I

Can someone give me a basic rundown of how we use Schrondinger's equation to understand orbitals? I know we don't have to know the equation in depth but I am confused on the general relationship between the equation and orbitals.

ErinKim1I

Even though d has a higher energy than s, I was told that for some configurations you have to switch 3d to be in front of 4s. When is this the case?

ErinKim1I

the mass of an electron is a constant (9.11x 10^-31 kg).

ErinKim1I

What are some situations where you have to set Ek to 0?

ErinKim1I

It all depends on what the question is asking. For example, if the question asks for the wavelength given mass and velocity, then you use the debroglie equation. if the question asks for KE or the maximum energy of electrons you use the Ek equation.

ErinKim1I

What I found helpful is realizing that in certain situations, the energy of the photon (E=hv) is equivalent to the work function. Instead of trying to figure out the work function, I simply use the Einstein equation. But this is only in particular cases.

ErinKim1I

Yes, you have to convert picometers to meters because m is the standard SI unit

ErinKim1I

The velocity of an electron that is emitted from a metallic surface by a photon is 3.6 x 10^3 km/s. Part B says: No electrons are emitted from the surface of the metal until the frequency of the radiation reaches 2.50 x 10^16 Hz. How much energy is required to remove the electron from the metal surf...

ErinKim1I

Once you balanced the equation, just find % mass of each element, convert mass to mol, divide each element's # moles by the smallest # mol,make sure you get whole numbers or otherwise multiply to get a whole number, and the numbers you get are the ratios for the empirical formula.

ErinKim1I

(b) take the number of moles of oxygen gas you initially have and subtract it by the moles of O2 used in the first equation to produce P4O6. you should have about .0405 mol O2 for the second equation. Use that number to calculate how many grams of P4O10 you would be able to produce in the second equ...

ErinKim1I

Which of the following happens when the frequency of electromagnetic radiation decreases? Explain your reasoning. (a) The speed of the radiation decreases. (b) The wavelength of the radiation decreases. (c) The extent of the change in the electrical field at a given point decreases. (d) The energy o...

ErinKim1I

I think this question is just testing if you understand law of conservation of mass, so I think the answer should be no.

ErinKim1I

If he used a fraction w/ denominator 2, he probably multiplied the entire equation by 2 to create whole numbers afterwards

ErinKim1I

Find the moles of C, H, N, and O as these are the elements in caffeine. Then, divide by the smallest coefficient to get the EF. Divide the given molar mass of caffeine by the molar mass of the EF to get the ratio. multiply the resulting number by the EF to get the MF. To write the equation: MF of ca...

CHEMISTRY COMMUNITY

Search found 31 matches

Re: Drawing Lewis Structures on the Final Exam

Re: Coordination number

Drawing coordination compounds

Re: Textbook 4.37

Re: Naming shape

Re: coordination number vs. oxidation number [ENDORSED]

Re: Hybrid Orbitals

Clarifying wording

Re: 3.85 part b

Re: Concept of Exceptions

Re: Radicals [ENDORSED]

Re: Electron affinity [ENDORSED]

Re: Unicorn Practice Midterm #8

Re: Ni3+

Ni3+

Zeff HW 2.37

Relationship to Schrodinger's Equation

Schrodinger's Equation & Orbitals

Switching 3d and 4s

Re: Calculating kinetic energy of an emitted electron [ENDORSED]

Ek= 0 [ENDORSED]

Re: When to use DeBroglie or Ek equation

Re: Different equations

Re: Ch.1 #41 [ENDORSED]

HW 1.33

Re: Empirical Formula

Re: M.11

HW 1.3 [ENDORSED]

Re: Mass of Products VS. Mass of Reactants- Class Assessment

Re: Balancing Equations With Rational Coefficients [ENDORSED]

Re: M19 - Combustion Analysis