CHEMISTRY COMMUNITY

cara_cavarretta_3F

Thank you!!

cara_cavarretta_3F

SO2 as it results from fossil fuel combustion

cara_cavarretta_3F

I could be wrong but from what I've read, the state of a substance more so depends on the temperature and pressure acting upon the already existing IMF's, such as water having hydrogen bonds but going between gas, liquid, and solid depending on environmental conditions

cara_cavarretta_3F

If an acid is polyprotic is it stronger?

cara_cavarretta_3F

Hey friends,
I read that we won't need to know the Ka and Kb constants until 14B, and these are necessary for Examples 12.10-11 in the 6th edition, so will we not be responsible for knowing how to do these kinds of calculations on the final?
Thanks

cara_cavarretta_3F

In order to do part b on this problem we need to know the formula for zinc nitrite but I keep getting conflicting answers on the internet, does anyone know the right formula?

cara_cavarretta_3F

London forces rely on random moments in which electrons are clustered at one particular area of the atom, and this happens more often with higher polarizability, or ability to be distorted. With a higher atomic radius, the nucleus has less control over the surrounding electrons, so the electrons are...

cara_cavarretta_3F

Alpha stands for the polarizability of the molecules, alpha 1 being the polarizability of the first molecule multiplied by alpha 2, the polarizability of the second molecule.

cara_cavarretta_3F

Vectors having to do with dipoles denote the direction of charge going from positive to negative or negative to positive. In the molecule H20, attached is a picture of the vector of the bent molecule in which the vector goes from the positive upward bent hydrogen atoms down to the downward negative ...

cara_cavarretta_3F

Even though we still have discussion for Mon-Wed is our homework still due the next week as well? Sorry, just to be sure.

cara_cavarretta_3F

Resonance structures would not affect bond angles as the shape is based upon atom structure, which does not change in resonance. As for electrons and lone pairs, a molecule with multiple resonance structures would actually have a hybrid of all possible electron configurations so different resonance ...

cara_cavarretta_3F

Is this for all discussions or just for Thursday and Friday discussions?

cara_cavarretta_3F

On a related note, do you know if we will be responsible for knowing exact electronegativity values or should we just know the general trend?

cara_cavarretta_3F

Are you referring to hybridization of atomic orbitals?

cara_cavarretta_3F

I believe Dr. Lavelle looks at the class average and sets a grading scheme based upon how well everyone did. Based off of the grading scheme on Bruin Walk, a majority of people received A's.

cara_cavarretta_3F

Nick Bazett 1F wrote:Do we take the midterm in pen or pencil?

I believe it needs to be in pen just like previous tests.

cara_cavarretta_3F

It helps me to think about it being more beneficial to have a full shell of 10 electrons rather than a full shell of 2 electrons. Remember this is also the case for Cr, in which a half shell of 3d5 with all electrons of the same spin is more stable than having a full 4s2 and 3d4.

cara_cavarretta_3F

Thank you!

Christine Chow 4G wrote:I believe oxygen has a lower ionization energy due to the fact that its 8th electron becomes paired (the up and down spin) versus filling a new orbital. There would be more electron repulsion in this pair versus the other 3p electrons that are in their own orbital (x,y,z)

cara_cavarretta_3F

Oxygen is to the right of Nitrogen, why does it have a lower ionization energy than Nitrogen if ionization energy increases to the right?

cara_cavarretta_3F

px, py, and pz simply refers to the location of the orbitals based on the Cartesian axes. I'm guessing in an exam, you would just use the 2p6 notation unless the orbital locations are specfically asked for in the question.

cara_cavarretta_3F

Example 1.5 includes converting from eV to to J, is this a kind of conversion we should know for Test 2?

cara_cavarretta_3F

Do we need to know these exceptions for the test tomorrow?

cara_cavarretta_3F

I have a question about 2.19 regarding part d. I understand that from n=4 equates to n-1=3 and l=3. Therefore, there are s, p, d, and f suborbitals but I don't understand why the answer says the suborbitals are 4s, 4p, 4d, and 4f. What are the 4's for?

cara_cavarretta_3F

In metals, free electrons may float about the metal but do not have enough energy to escape from the surface. When additional energy is added in the form of a photon that reaches the threshold energy, these free electrons can escape from the surface of the metal and be emitted

cara_cavarretta_3F

You can find the wavelength of an electron moving at a certain velocity by using the DeBroglie equation. Wavelength is equal to Planck's constant h divided by momentum p, which is equivalent to mass m multiplied by velocity v. In this case, you would use the given mass of an electron and the velocit...

cara_cavarretta_3F

The tests will always be free response and should be about the same length as Test 1.

cara_cavarretta_3F

This might be a dumb question but for Chapter 1 Number 41 when we are asked to calculate the velocity of a neuron of wavelength 100. pm, why do we have to use the DeBroglie equation instead of just c=λv?

cara_cavarretta_3F

The threshold energy is a minimum amount of energy that a photon (think a packet of energy) has to reach to eject an electron from an atom of a certain metal. Threshold energy is determined by the type of metal, and different metals have different threshold energies for its atoms/electrons.

cara_cavarretta_3F

Traditionally and from what is required of us in this course, photons are considered massless.

cara_cavarretta_3F

Like said above, pay attention to the what the problem is asking for. A question can ask for the atoms of H in the molecule H2O for example, in which you would have to use Avogadro's number and then multiply by two to account for the two hydrogen atoms for every molecule of H2O.

cara_cavarretta_3F

Is this worksheet and the material included similar to what will be on this week's test?

cara_cavarretta_3F

Where do we find what homework problems we are doing for the week?

CHEMISTRY COMMUNITY

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