CHEMISTRY COMMUNITY

Adam_ElSayed_3B

50% of ALL points. Check out the syllabus & good luck!

Adam_ElSayed_3B

Determining spectrum would be a good example of nm, but I'm sure in experimentation it isn't hard to switch between the two at all.

Adam_ElSayed_3B

We use VESPR theory and our knowledge of different compounds and their bond lengths, but I've only ever heard of it being done with a computer.

Adam_ElSayed_3B

Well for one, electrons are charged. They behave totally differently. A photon is more energy condensed, while an electron is a charge. I'm not good enough at quantum physics to go further.

Adam_ElSayed_3B

I start grouping things into my head, and making mental connections. E.g. this one ligand corresponds to this name, and then coming up with a quirky way or connection to it. I've caught myself singing to memorize before. It's hard though, best of luck.

Adam_ElSayed_3B

What a sweet post! I plan to use up my swipes and enjoy my time at UCLA before I have to go home.

Adam_ElSayed_3B

Think of it like an umbrella - Lewis bases' definition, using lone pairs, encompass more than the smaller umbrella of Bronsted.

Adam_ElSayed_3B

Organic chemistry is the chemistry of carbons, so yes!

Adam_ElSayed_3B

I do four, but you're really thinking about significant figures here, which change based on the problem text.

Adam_ElSayed_3B

You're essentially going backwards. Initially you take the negative log, so do the opposite. From there, you'll have your pKa and can move forward accordingly.

Adam_ElSayed_3B

Yep! Depending on what H2O is around, it might act as an acid or a base. I imagine that this applies to the environment around it on a greater scale.

Adam_ElSayed_3B

Pi bonds by nature can only apply to covalent bonds. Ionic bonds don't engage in sigma or pi bonds.

Adam_ElSayed_3B

As others have said, compare electronegativity, but I find that it helps to recognize that salts and metals will almost always be ionic.

Adam_ElSayed_3B

Something is polyprotic when there are multiple protons (H) available to be deprotonated.

Adam_ElSayed_3B

Stronger acids aren't stable, as they're likely to act as an acid and react. However, their conjugate bases are rather stable.

Adam_ElSayed_3B

HF doesn't want to disassociate. The electronegativity is different enough that they're basically stuck to one another, and won't act as a strong acid.

Adam_ElSayed_3B

The roadmap we've seen in stereochemistry explains the use of Avogadro's number. From going from moles to atoms or vice versa, Avogadro's number is the way to go.

Adam_ElSayed_3B

A polyprotic compound has multiple places where it can be deprotonated. The Hs can be taken off, and there are multiple of them.

Adam_ElSayed_3B

Below a pH of 7 is acidic, and above it is basic. I find using the pKa to find pH to be the easiest way to figure out if something is acidic or basic for sure.

Adam_ElSayed_3B

They aren't the same! One refers to a # of 5, the other to a 4. Others have explained shape!

Adam_ElSayed_3B

If you're staring straight at it, a wedge is away from you and a dash is towards you. Sometimes you'll see a combined notation referring to the bond being either in different conformations.

Adam_ElSayed_3B

A tetrahedral shape doesn't really fill in a sphere. There's no need for it to add up to 360 degrees.

Adam_ElSayed_3B

I believe it refers to the orbitals being filled with two electrons.

Adam_ElSayed_3B

Honestly not a huge fan of the textbook. I'll stick to rewatching portions of the lecture any day.

Adam_ElSayed_3B

Slightly less than 90 degrees.

Adam_ElSayed_3B

Bent and angular are the same as many others have said!

Adam_ElSayed_3B

When there's only one s, yes. Otherwise, it fills in in order (e.g. sp2)

Adam_ElSayed_3B

A single bond IS a sigma bond! For single through triple bonds they all have one sigma bond, and increase by one pi bond her extra bond starting with a single bond having 0 pi bonds, a double having 1 pi bond, ect.

Adam_ElSayed_3B

solving these problems is as simple as counting the amount of surrounding bonds/lone pairs and finding the nswer that has the amount of orbitals that match!

Adam_ElSayed_3B

There is a difference between how the hydrogens are placed on a 3D model depending on whether there are an even or odd number of carbons

Adam_ElSayed_3B

Because there are no negative charges or anything there are no resonance structures

Adam_ElSayed_3B

A tip my friend told me is to count up the number of lone pairs + the number of bonds, and then find the answer that counts up to that same number! For example sp3 would add up to 4 because there is a 1 in the s spot and a 3 in the p spot

Adam_ElSayed_3B

Why are O N and F atoms the only ones that bond with hyrdrogen for these types of problems ?

Adam_ElSayed_3B

To find resonance you would take the number of valence electrons of the respective Element, and from that subtract the number of electrons/bonds around it. A single bond counts as one, and each electron counts as one

Adam_ElSayed_3B

To find resonance you would take the number of valence electrons of the respective Element, and from that subtract the number of electrons/bonds around it. A single bond counts as one, and each electron counts as one

Adam_ElSayed_3B

The correct answer would be D because it is the only one that has has H connected to an O,N, and F molecule on each side.

Adam_ElSayed_3B

I believe it goes up to f, but generally speaking we never really do work past d. It gets pretty confusing.

Adam_ElSayed_3B

You could use pKa, which is a numerical value representing the acidity of a molecule, or just look at the molecule itself to see if it would accept or give electrons.

Adam_ElSayed_3B

To my knowledge, orbitals are more representations of where the electron can be found at any given time. For example, with an s orbital, there's a sphere of space where the electron can be found, whereas with the p orbital it's more of a peanut shape.

Adam_ElSayed_3B

Because the representation of double and single bonds is just that - A representation. In our experience thus far, most chemical representations on paper don't reveal the whole paper. For example, Lewis structures don't show resonance, the same way Newman structures don't show the valence electrons....

Adam_ElSayed_3B

Because the representation of double and single bonds is just that - A representation. In our experience thus far, most chemical representations on paper don't reveal the whole paper. For example, Lewis structures don't show resonance, the same way Newman structures don't show the valence electrons....

Adam_ElSayed_3B

For electron affinity, it increases the more u head towards the top right of the periodic table, and the least electron affinitive element would be the bottom left element (Francium). hope this helps :)

Adam_ElSayed_3B

What is the easiest way to calculate wavelength when an atom is transition between different energy levels (levels for n)?

Adam_ElSayed_3B

How do you determine wavelength, frequency, and energy from the amount of photons a wave of light produces?

Adam_ElSayed_3B

What are the different level of light radiations compared to eachother? For example gamma compared to ultraviolet, ect.

Adam_ElSayed_3B

Hey guys, I just wanted to know what the difference between amplitude, wavelength, and frequencies are in wavelength illustrations. Also how do you determine Energy?

Adam_ElSayed_3B

What do the 1-bromopropane and the magnesium represent in the equation as pictured in the problem? Because as far as I've solved it I did not reference those elements

Adam_ElSayed_3B

Number 7 is quite simple, the only components are CaCl2 and water, it gives the total mass of the compound and the percent of that amount is CaCl2. Just Minus the percent of cacl2 from 100 to get the percent of water, then take the respective percent of what element you want from the total weight of...

Adam_ElSayed_3B

When I did this problem I made a lot of mistakes, such as mistaking the correct decimal points, but just double check that all ur calculations are right and youll be fine. Get the molar mass, and then anonther mistake I made was put v=m/n instead of v=n/m so watch out for stupid miscalculations.

Adam_ElSayed_3B

I am somewhat confused about the number 20.00, because the decimal is preceded by a 0, so would the sig fig rule that includes the 2 0s after the decimal point still count?

Adam_ElSayed_3B

Avagadro's number represents 6.023 x 10^23, and is often used to calculate the number of particles in an element. It can be used to convert moles to number of things (particles, atoms, ect.) Other than that my knowledge of avagadro's number and its application in conversions is a little rusty hahaha.

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