CHEMISTRY COMMUNITY

Karina Rodriguez 2H

Are there any exceptions that arise in hybridization? Or will it always depend only on number of bonds?

Karina Rodriguez 2H

Does anyone have any tips for memorizing the VSEPR chart?

Karina Rodriguez 2H

What rules do I need to keep in mind to tell whether a salt is acidic or basic?

Karina Rodriguez 2H

The question asks you to organize solutions from the highest pH to the lowest pH, it only gives molecular formulas - are we supposed to base this off of the strength of the acids/bases or is there another way to determine pH from name?

Karina Rodriguez 2H

Can someone explain the significance of Ka and pKa and how they relate to acidity?

Karina Rodriguez 2H

Can anyone explain how to identify ligands by looking at them? What does the presence of a ligand in a compound imply?

Karina Rodriguez 2H

Give the oxidation state of the metal species in the complex [Co(NH₃)₄Cl₂]Cl. Can someone explain how to do this?

Karina Rodriguez 2H

Does anyone have tips for remembering how to name compounds ?

Karina Rodriguez 2H

Can anyone explain what a coordination number is and what it is important for figuring out?

Karina Rodriguez 2H

Can anyone explain how to calculate the coordination number for [Co(en)₂(CO)₂]Br ? Also what does the (en) refer to?

Karina Rodriguez 2H

Beryllium is higher on the periodic table than chlorine, but chlorine is farther right than Be, how do I remember which has higher electronegativity?

Karina Rodriguez 2H

Is either a sigma or a pi bond stronger than the other?

Karina Rodriguez 2H

Would a delocalized pi bond only exist in a substance with resonance structures?

Karina Rodriguez 2H

Can someone give a basic description of hybridization? Trying to understand it.

Karina Rodriguez 2H

Does anyone have a good chart to refer to/ attempt to memorize regarding VSEPR?

Karina Rodriguez 2H

How would you find the number of valence electrons in an element in the d-block? Additionally, will this be asked of us?

Karina Rodriguez 2H

Can someone explain the concept of resonance as well as how to find resonance structures?

Karina Rodriguez 2H

How would I tell which combination of elements would form a stronger covalent bond than another combination?

Karina Rodriguez 2H

What would I need to keep in mind to tell if certain elements would form ionic bonds versus covalent bonds?

Karina Rodriguez 2H

How can you tell when there will be an exception to the octet rule and what do you do to accommodate the exception?

Karina Rodriguez 2H

I find it helpful to look at periodic tables with color gradients assigned to each trend separately.

Karina Rodriguez 2H

Likely atomic radius and electron affinity too.

Karina Rodriguez 2H

Any tips on remembering the trend of electronegativity on the periodic table?

Karina Rodriguez 2H

I don't think we need to know them; they should be given on the midterm. If he wanted us to memorize them he would probably say so explicitly.

Karina Rodriguez 2H

"A Lewis structure of the carbamate ion is shown. An N atom is bonded to two H atoms and a C atom through single bonds. There is one lone pair on the N atom. The C atom is also bonded to one O atom through a single bond and a second O atom through a double bond. There are two lone pairs on the ...

Karina Rodriguez 2H

I think a good way to remember is by marking up a periodic table (specifically with labelled arrows indicating trends) and making a mental note of those arrows. It might also help to look at individual color-coded or representative periodic tables for each trend.

Karina Rodriguez 2H

Can someone please explain how to find electron configuration in the most basic terms. I feel I have a slight grasp on the subject but I'm still confused by them.

Karina Rodriguez 2H

Yes, specifically an atom that loses an electron is a cation (positive ion) because it lost a negative charge; while an atom that gains an electron is an anion (negative ion) because it gained a negative charge.

Karina Rodriguez 2H

I'm not entirely sure, but it seems like maybe the subshells that hold more electrons might have higher energies?

Karina Rodriguez 2H

Yes, you can have the same 3 quantum numbers, but the 4th number is the spin quantum number. Only two electrons can have the same first 3 quantum numbers, this is because the spin number only has two values (+1/2, -1/2.)

Karina Rodriguez 2H

"What would the speed of each particle be if it had the same wavelength as a photon of red light (wavelength=750.0 nm)?
proton (mass=1.673×10−24 g) speed:
neutron (mass=1.675×10−24 g) speed:
electron (mass=9.109×10−28 g) speed:
What equation(s) do I need to use to figure this out?

Karina Rodriguez 2H

Do we need to know how to work out problems using this equation for this class? Or do we just need to be familiar with the theory behind it.

Karina Rodriguez 2H

Does anyone have any tips for how to recall the trends in the periodic table?

Karina Rodriguez 2H

"How many electrons in an atom could have these sets of quantum numbers? n=3
n=4,ℓ=1
n=7,ℓ=2,mℓ=−1"
What do I need to refer to?

Karina Rodriguez 2H

"What is the minimum uncertainty in an electron's velocity (Δvmin) if the position is known within 11 Å. What is the minimum uncertainty in a helium atom's velocity (Δvmin) if the position is known within 1.1 Å." I'm unsure of what my mistake is. I plugged in the given values to my manipul...

Karina Rodriguez 2H

When you're asked to calculate the energy that will be required or emitted, you should most likely leave the sign either negative or positive because it'd indicate whether energy was being released or absorbed. When you use that energy value in another equation, the negative sign is no longer necess...

Karina Rodriguez 2H

Has anyone made an outline of which equations/topics to make sure to study? I don't know where to start or what I need to focus on. I've a general understanding of where the topics covered will end, but I feel like I'm missing something.

Karina Rodriguez 2H

Like the replies above me, I don't think we'll have to show any work in deriving any equations. I do think it might be possible to be asked about the steps taken to derive the equation, so it'd be good to have an understanding of how to do so.

Karina Rodriguez 2H

"A blue line is observed at 486.1 nm in the spectrum of atomic hydrogen. Determine the values of n for the beginning and ending energy levels of the electron during the emission of energy that leads to this spectral line." What steps do I need to take to find the n values? I'm unsure of wh...

Karina Rodriguez 2H

Does anyone have any tips on how to remember which subshell corresponds to which orbital?

Karina Rodriguez 2H

Yes, and only topics up to question 21 on the sapling hw will be on the midterm.

Karina Rodriguez 2H

Could someone walk me through working with the Bohr frequency condition? I'm unsure of exactly what equation to use/how to break down a word problem about about atomic spectroscopy.

Karina Rodriguez 2H

I doubt we'd be required to memorize the whole spectrum, but I agree with the posts above: it's probably best to have a general idea of how the spectrum is organized and its trends regarding frequencies and wavelengths.

Karina Rodriguez 2H

Yes, threshold energy is the same as work function. The two can be used interchangeably to mean the energy required to remove electrons from metals.

Karina Rodriguez 2H

How would I approach this problem?
A liquid is exposed to infrared radiation with a wavelength of 9.74×10−4 cm. Assume that all the radiation is absorbed and converted to heat. How many photons are required for the liquid to absorb 32.74 J of heat?
Do I need to use both E=hv and C=lambda(V)?

Karina Rodriguez 2H

Can someone go over how you could combine the equations: E=hv and C=lamba(v)? Dr. Lavelle does this in his Wednesday lecture but I'm unsure of how they would combine to be E=(hc)/lambda.

Karina Rodriguez 2H

Hi, I'm having trouble with the 10th problem on the HW. Consider the nucleophilic addition reaction of 2‑butanone with excess propyl magnesiumbromide, made in situ by reacting 1‑bromopropane with metallic magnesium, to make 3‑methyl‑3‑hexanol. Reaction scheme where 2-butanone (d = 0.81 g/mL), 1-brom...

Karina Rodriguez 2H

Hi,
We're allowed to use scientific calculators. It's best to include a few decimal places so you can get the most accurate solution when determining significant figures after your calculations are complete.

Karina Rodriguez 2H

Hi, When I see problems regarding solution concentration I usually try to break down the question before deciding which formula to use. If the problem presents you with 2 values, you'll likely use M=n/v. If it presents you with 3 values, you'll likely use M(initial)V(initial)=M(final)V(final). It he...

Karina Rodriguez 2H

Hi, I'm having trouble figuring out how to approach question 7. Would I refer to calculating mass percentage composition? The portion of the question regarding water is confusing me.

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