CHEMISTRY COMMUNITY

Sona Hakobyan 3J

Can someone please explain Churro #34?
Grace sees her crush and panics, accidentally dropping 382.7 mg of HCl and 147.1 mg CaO into a 1L flask. After filling that flask with water up to the 1L mark, what is the pH of the resulting solution?

I don't know where to start.

Sona Hakobyan 3J

Polarizing Power- The smaller and more highly charged, the higher polarizing power it has
Polarizability- The bigger it is and more electrons it has, the more polarizable it is

Sona Hakobyan 3J

This is not possible. Please provide the question you're referring to; that might help to explain.

Sona Hakobyan 3J

https://upload.wikimedia.org/wikipedia/ ... ale-01.jpg
Take a a look at this scale. The lower the PH, the more acidic it is. Thus, the stronger the acid, the lower its PH.

Sona Hakobyan 3J

Yes. Most importantly, you need to know that it is indicative of an atom's size. The greater the atomic radius, the bigger the atom.

Sona Hakobyan 3J

Frequency is the number of times a point on a wave passes a fixed reference point in one second (remember waves oscillate). All you need to know is the frequency is measured in Hz (Hertz)

Sona Hakobyan 3J

You determine limiting reactant by seeing which reactant will run out first in a reaction. Thus, you can figure this out by finding the mass of product each reactant produces. Whichever produces less of the product will therefore be the limiting reactant. Percent yield= actual yield/theoretical yiel...

Sona Hakobyan 3J

Electronegativity is the tendency of an atom to attract a shared pair of electrons towards itself. It increases across and decreases down the periodic table.

Sona Hakobyan 3J

Can someone summarize the key things we should know about acids and bases for the final?

Sona Hakobyan 3J

Did you get marked off specifically for that? There is London Dispersion forces on between all molecules so that does not make sense..

Sona Hakobyan 3J

If you look at AX2E3 in Figure 2E. 7 on page 113 you will see that it is possible to have a linear structure with 3 lone pairs.

Sona Hakobyan 3J

Yes there is a difference. Cations have high polarizing power if they are small and highly charged because they have a higher ability to distort e- cloud of the anion because their positive center pulls in the electrons from the anion. On the other hand, anions polarizability increases with their si...

Sona Hakobyan 3J

Also curious, posting to follow thread.

Sona Hakobyan 3J

505095793 wrote:What does it mean when an electron is promoted? Also, what effect does electron promotion play on the overall molecule or atom?

I don't think this is something we need to know as Dr. Lavelle has not covered this topic in class.

Sona Hakobyan 3J

Hanlin Zhu 4G wrote:I think different intermolecular interactions is also included in the test.

Can you elaborate on this?

Sona Hakobyan 3J

I would think the test would cover everything after the midterm up until hybridization.

Sona Hakobyan 3J

It was also mentioned in a previous post that there might be a 3-5 percent curve based on class average.

Sona Hakobyan 3J

Because the bonds are still within the same region and repel other regions of electrons.

Sona Hakobyan 3J

I'm pretty sure we won't have lecture as long as people don't ask too many questions during the lectures leading up to it! :)

Sona Hakobyan 3J

I think this is something they may end up posting in the end. As long as you are doing 3 posts a week, you shouldn't be worried.

Sona Hakobyan 3J

Dipole moments occur when there is a separation of charge. They can occur between two ions in an ionic bond or between atoms in a covalent bond; dipole moments arise from differences in electronegativity. The larger the difference in electronegativity, the larger the dipole moment. The distance betw...

Sona Hakobyan 3J

I thought these are both names, in addition to some others, for the same forces--and therefore the same strength. I'm not 100 percent sure. Anyone know for sure?

Sona Hakobyan 3J

Any element that has or can have a d orbital (aka period 3 and beyond)

Sona Hakobyan 3J

I think we do recent homework as prep for whatever test is coming up; so, I think outline 3 would be fine.

Sona Hakobyan 3J

This is great practice :)

Sona Hakobyan 3J

Celine Hoh 4H wrote:Do we need a blue book for the test?

No need for a blue book!

Sona Hakobyan 3J

ml specifies a specific orbital. The D subshell itself has 5 orbitals (ml= -2, -1, 0, +1, +2) and therefore two electrons in each (10 total). However, the ml= -2 specifies that it is one of these 5 orbitals, which can only contain two electrons. Can you further explain this? Still confused. Sure! T...

Sona Hakobyan 3J

I think that if it is in any way on the midterm, it will be conceptual.

Sona Hakobyan 3J

ml specifies a specific orbital. The D subshell itself has 5 orbitals (ml= -2, -1, 0, +1, +2) and therefore two electrons in each (10 total). However, the ml= -2 specifies that it is one of these 5 orbitals, which can only contain two electrons.

Sona Hakobyan 3J

Chloe Orsini 1K wrote:I was thinking of doing a massive group me! We can use it to get together and study or ask questions and stuff like that! I could make one and add y'all and then you guys could add your friends who are interested too, does this work?

Sounds great!

Sona Hakobyan 3J

Also down:) My name is Sona Hakobyan

Sona Hakobyan 3J

Anyone know the answer? I am also curious.

Sona Hakobyan 3J

This describes it in depth: "It’s the energy level. With spectroscopy you are measuring how energy is absorbed, emitted, and or reflected. In molecular spectroscopy you are looking at interactions with bonding electrons in the outer valence shell. The interactions change according to the struct...

Sona Hakobyan 3J

taline_n wrote:I asked a UA and she said that no more online modules will be posted for the rest of the quarter.

Did she/he say why?

Sona Hakobyan 3J

Hi all,
I seem to be having a lot of trouble with the quantum section. It is always very confusing to be as to which equations I should be using and when? Is there any sources you guys can provide that you think helped you for the test?

Sona Hakobyan 3J

You need to know the following equations and conversions:
KeV = kilo-electric volt (multiply quantity by 1000)
1.602 x 10^-19 J = 1 eV
E = hc/lambda

Sona Hakobyan 3J

Someone correct me if I'm wrong, but I believe if he doesn't cover it in class or his video modules, then we don't need to know it.

Sona Hakobyan 3J

Does anyone know what the test average for the first test was?

Sona Hakobyan 3J

For me the most effective way is using google docs because when I hand write notes I cannot read my writing. However, for graphs and other pictures I like to draw them in my notebook and label them as figures in my notes. I do believe that if I had better handwriting, hand writing my notes would be ...

Sona Hakobyan 3J

Everything regarding test 2 should be on outline 2 :)

Sona Hakobyan 3J

For those who have taken the test, do you think the difficulty is the same level as the homework and modules? In other words, would studying these two be sufficient to do well on the exam? If you have any sources that helped you be better prepared, please let me know !

Sona Hakobyan 3J

Yes it is safe to round up these numbers. I've heard that the numbers have to be within 5 percent of the next closest integer to be rounded. .

Sona Hakobyan 3J

This would not be likely because if there were two reactants with the same mole ratio and are consumed the exact same, then there could be no limiting reactant.

Sona Hakobyan 3J

I start with whichever element is in the equation the least. Also I tend to do single elements last for example O2 or H2. This way you get everything out the way and however many O's or H's there turn out to be in the different products or reactants, it wont matter because we can account for them wi...

Sona Hakobyan 3J

Empirical Formulas requires the simplest whole number ratio in a compound, therefore it would be 3:4:3.

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