CHEMISTRY COMMUNITY

Nicoline Breytenbach 3D

Several factors go into it. Usually, whatever has the weaker intermolecular forces will have the lower boiling point. For example, if comparing two molecules and one is capable of hydrogen bonding, that one will have the higher boiling point. If one is capable of dipole-dipole interactions and the o...

Nicoline Breytenbach 3D

dien is tridentate

Nicoline Breytenbach 3D

The shorthand should be used within the formulas so as not to write out the long formula for ethylenediamine, etc, not as a substitute for the name itself.

Nicoline Breytenbach 3D

Electronegativity and electron affinity are basically the same thing, so yes

Nicoline Breytenbach 3D

Nicoline Breytenbach 3D

Just know it can be either. I wouldn't be surprised if you get full points for only listing one or the other, but better be safe than sorry.

Nicoline Breytenbach 3D

Several factors go into it. Usually, whatever has the weaker intermolecular forces will have the lower boiling point. For example, if comparing two molecules and one is capable of hydrogen bonding, that one will have the higher boiling point. If one is capable of dipole-dipole interactions and the o...

Nicoline Breytenbach 3D

They can be atoms too. For example: Cl-

Nicoline Breytenbach 3D

Square planar.

Nicoline Breytenbach 3D

Radicals are unpaired electrons that are highly reactive and exist only for short periods of time. One way something becomes a radical is if one electron in a pair is ripped away by another molecule.

Nicoline Breytenbach 3D

Yes, double bonds contain one sigma bond and one pi bond

Nicoline Breytenbach 3D

A superacid is any acid stronger/ more acidic than pure sulfuric acid. Similarly, superbases are bases with extremely high basicity.

Nicoline Breytenbach 3D

What's the difference between Lewis acids and bases and Bronsted acids and bases? Which do we work with more in this class? Is there a lot of overlap between the two, or any specific things that don't overlap?

Nicoline Breytenbach 3D

Do water molecules form only one hydrogen bond with another water molecule? Or does it use both its hydrogens, forming two separate hydrogen bonds with two other water molecules?

Nicoline Breytenbach 3D

OH2 and H20 are interchangeable and refer to the same compound.

Nicoline Breytenbach 3D

The ligand names should be in alphabetical order.

Nicoline Breytenbach 3D

All coordinate covalent bonds are covalent bonds, but not all covalent bonds are coordinate covalent, if that makes sense. Coordinate covalent bonds are a type of covalent bond where both electrons involved in forming the bond are originally from one of the interacting atoms or molecules, whereas us...

Nicoline Breytenbach 3D

Because dipoles with opposite charges attract each other, like a magnet. On the other hand, two dipoles with the same charge will repel each other, which would lead to weak interactions between the dipoles

Nicoline Breytenbach 3D

I struggle with this too, and I've found that double checking the formal charges helps me a lot.

Nicoline Breytenbach 3D

You could either take the average, or simply say less than 140 but more than 120 pm. Both were taken as correct answers

Nicoline Breytenbach 3D

Both outlines 3 and 4!

Nicoline Breytenbach 3D

When there are lone pairs involved in the molecule, the resulting bond angles will usually be "less than" a specific number, and we don't have to memorize the actual values specifically.

Nicoline Breytenbach 3D

Not really, Lewis structures are 2-dimensional models and thus couldn't perfectly represent a 3-dimensional molecular shape.

Nicoline Breytenbach 3D

Basically the degree to which electron lone pairs or bonding pairs repel other lone pairs or bonding pairs, contributing to the overall shape of the molecule. Higher repulsion means the electrons "want to be alone," and thus repel other electrons to a greater degree, sometimes even forcing...

Nicoline Breytenbach 3D

michellebui_3L wrote:Does anybody know how we will turn in homework for Week 8 if we have discussion on Thurs/Fri?

We will turn it in week 9!

Nicoline Breytenbach 3D

I know the Wednesday before Thanksgiving break (the day before break officially starts) a lot of professors decide to cancel lecture. Does anyone know if we will have lecture in this class on that Wednesday or if we will have it off? I need to make travel arrangements.

Nicoline Breytenbach 3D

It is a necessary step, and if on a test you were to leave off the brackets and charge in your answer you would likely be docked points. It also helps when drawing the lewis structure of a salt which contains two or more ions, since the different ions must be separated by brackets to obtain the corr...

Nicoline Breytenbach 3D

It's because O is more electronegative. Also, usually when there is one of one element and multiple of another, the unique element is in the center (though not always, it's just a trend).

Nicoline Breytenbach 3D

Calculating and comparing formal charges is the best way to determine the most stable structure!

Nicoline Breytenbach 3D

Whichever structure gives the most possible atoms a formal charge of 0, or closest to 0!

Nicoline Breytenbach 3D

Lines represent shared or bonded electrons, while dots are used when an electron is unbonded: a "lone pair"

Nicoline Breytenbach 3D

I just do all the homework problems at least once, then look over them again in the days leading up to the test. Prof. Lavelle says that if you do all the homework problems you should be well-prepared for the test.

Nicoline Breytenbach 3D

Prof. Lavelle also has the outline for the test on his website so you can see everything that will be covered in test 2.

Nicoline Breytenbach 3D

I sometimes have this same problem, and for me I've discovered it usually has to do with not converting everything to the right units before calculating. For instance leaving something as grams when it should be kilograms can lead to the right number answer except with the wrong power.

Nicoline Breytenbach 3D

Constructive inference is when two waves interact "in phase," or when their peaks line up together and their troughs line up together. this results in a combined wave of greater amplitude. Think of an ocean wave, if two little waves combine they make a bigger wave. Conversely, destructive ...

Nicoline Breytenbach 3D

There aren't clear-cut boundaries between specific colors; but rather, they overlap and blend together. So, 500 nm would be blue-green, or a sort of teal color. Other colors on the spectrum might be mostly blue but a little green, or mostly green but a little blue. And people might classify colors d...

Nicoline Breytenbach 3D

If 1 million high energy photons hit a metal surface, the maximum amount of electrons that could be ejected would be 1 million electrons, not .5 million. This is because the ratio of incoming photons to ejected electrons is 1:1, provided that each of the photons has a high enough energy to cause the...

Nicoline Breytenbach 3D

In lecture he said that the cutoff for wavelength isn't really an exact number, though the wavelength value he suggested as the cutoff was about 10^-18 or greater. He also said that he wouldn't test us on questions that are close to the cut off value; if the wavelength is too small it will be by a l...

Nicoline Breytenbach 3D

Basically, the US (as well as Myanmar and Liberia) are the only countries that still use the imperial system for measurements, including Fahrenheit. Fahrenheit started as a British colonial measurement hundreds of years ago, but by now both the UK and all of its former colonies (except the US) have ...

Nicoline Breytenbach 3D

I think we just get a periodic table and the scientific constants, not formulas.

Nicoline Breytenbach 3D

If only one reactant mass is given, you can assume that that is the limiting reactant. Otherwise, you will need to test to see which reactant is limiting :)

Nicoline Breytenbach 3D

Yukta Italia 3I wrote:Does that mean 120. has 3 sig figs and 120 has two sig figs?

Yes!

Nicoline Breytenbach 3D

Should we have all the common polyatomic ions memorized? Or will we be given that information when needed? If we do need it memorized, does anyone have any tricks to remember them more easily?

Nicoline Breytenbach 3D

If it had been 120 instead of 125, for example, 120 is only two significant figures while 120. is three. It has to do with zeroes at the end of numbers

Nicoline Breytenbach 3D

In some places I see grams per mole written as (g/mol) and other places as (g.mol^-1). I'm pretty sure they mean the same thing but I just want to confirm? Also is there a reason to use one notation rather than the other?

Nicoline Breytenbach 3D

During Friday's Lecture (Week 1)

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