CHEMISTRY COMMUNITY

Tiffany Dong_4e

The final will be 8 questions. One of the questions should be a homework problem.

Tiffany Dong_4e

You use bis, tris, and tetrakis if the compound is polydentate and the regular prefixes in any other instance.

Tiffany Dong_4e

How can you tell if a molecule is amphoteric given its chemical formula?

Tiffany Dong_4e

Know the reactions for carbonic acid and sulfuric acid.

Tiffany Dong_4e

Yes, cisplatin is the main compound. I believe we're supposed to know how it functions through its structure as well as possibly knowing how to draw it.

Tiffany Dong_4e

This would help because if you memorize the strong acids and bases, you can also determine whichever ones are weak. I would recommend it if you haven't already.

Tiffany Dong_4e

Superacids and superbases were briefly mentioned in class, but I believe we don't accommodate for them because they are extreme cases. For the most part, acids and bases should fall within the 0-14 pH scale.

Tiffany Dong_4e

Professor Lavelle seems to expect us to read the sections corresponding to the current homework of the week. I feel like if you understand all of the homework problems though, you should be fine. Just tailor your studying to your weaknesses and focus on what you feel you don't understand.

Tiffany Dong_4e

Yes, a Bronsted acid is the proton donor and a Bronsted base is the proton acceptor. This is based on the Bronsted-Lowry definition of acids and bases.

Tiffany Dong_4e

The definition of acid and base depends on which definition you're referring to. Solely considering the Lewis acid and base definition, an acid is an electron acceptor and a base is an electron donor.

Tiffany Dong_4e

What are the differences between Arrhenius, Bronsted, and Lewis acids and bases?

Tiffany Dong_4e

Benzene is nonpolar. Search up the shape and you'll see the symmetrical structure.

Tiffany Dong_4e

The number of questions hasn't been given yet, but the length of the final is around 3 hours.

Tiffany Dong_4e

Drawing line structures most likely won't be covered in our class. It's mainly for ochem.

Tiffany Dong_4e

Simply write the letter X or E for a subscript of 1. In addition, if it's a subscript of 0, don't write the letter.

Tiffany Dong_4e

It is used to stop cell division for cancer treatment, but it also stops healthy cell division.

Tiffany Dong_4e

They aren't. VSEPR is only determined by the regions of electron density and amount of bonding/lone pairs.

Tiffany Dong_4e

These terms are used to describe the characteristics of ions. Polarizability is generally associated with anions and polarizing power with cations, but this isn't a steadfast rule by any means.

Tiffany Dong_4e

The topics we've covered so far since the midterm are VSEPR, bond angles, and intermolecular forces. We will also be tested on what we learn Monday which will include pi and sigma bonds along with other material.

Tiffany Dong_4e

Electron affinity has a similar trend to electronegativity and ionization energy. (it increases going up and to the right)

Tiffany Dong_4e

Visualizing the shapes in my head helps me remember them because the names of the shapes are based off of how they're formed in real life i.e. trigonal planar is a flat triangle or seesaw is shaped like a seesaw.

Tiffany Dong_4e

Yes, all molecules have london dispersion forces. However, the more electrons a molecule has, the stronger the forces are.

Tiffany Dong_4e

The central atom is typically determined by whichever atom has the lowest electronegativity. Aside from this, the atom which is alone or has the lowest quantity is usually in the center.

Tiffany Dong_4e

Getting close to 0 is ideal, but the "next best" option would be giving a more electronegative atom like oxygen a negative charge.

Tiffany Dong_4e

I believe so because we used a chart to determine electronegativity difference in lecture. Generally, anything we need should be provided for us on the test.

Tiffany Dong_4e

A cation's ability to distort an anion's electron cloud is polarizing power. Polarizability is the tendency of a cation to be affected by an anion's polarizing power.

Tiffany Dong_4e

Lavelle wants us to write 3d before 4s, but I in general it isn't incorrect to write 4s before 3d. I think you should maintain class expectations for the test though.

Tiffany Dong_4e

He mentioned this briefly, but stated it will not be tested in this class.

Tiffany Dong_4e

If a molecule has resonance structures, but they are not explicitly asked for in the problem, do we still need to draw them?

Tiffany Dong_4e

How do we determine if a molecule has resonance structures?

Tiffany Dong_4e

Which elements have exceptions to the octet rule? i.e. Phosphorous which can have an expanded octet or Boron which doesn't need a full octet

Tiffany Dong_4e

Yes, it's only between nonmetals. If other metals were involved, it would probably be a different type of bond.

Tiffany Dong_4e

Resonant structures allow for greater accuracy when modeling certain molecules because they show us that those molecules have delocalized electrons which can move around. You don't "need" to move the bond, but it is good to know that the bond can move.

Tiffany Dong_4e

The stronger the bond, the shorter the bond length, so double bonds will be shorter than single bonds.

Tiffany Dong_4e

Are we expected to know the number of valence electrons in transition metals? It was a homework problem, so I wanted to make sure. The problem stated to identify the number of valence electrons (including d electrons) in magnesium. If we are expected to know this, how would we determine the number?

Tiffany Dong_4e

Aside from chromium and copper, are there any other elements that have "exceptions" in electron configuration?

Tiffany Dong_4e

Electron affinity is the likelihood of an atom gaining an electron, while electronegativity is the tendency of an atom to attract electrons.

Tiffany Dong_4e

I'm also confused how an electron is "ejected" with no kinetic energy. Could someone clarify further?

Tiffany Dong_4e

The electron moving from n1 to n2 is the process of it being excited. The Lyman and Balmer series describe the electron as it is falling back down to lower energy levels from its excited state.

Tiffany Dong_4e

You're provided a periodic table, along with an equation sheet, so I believe you should use those so that your answers will be more accurate. (:

Tiffany Dong_4e

If you're referring to the Heisenberg Uncertainty Equation, it should be the first one.

Tiffany Dong_4e

I also believe it is the amount of energy per photon because photons are essentially discrete packets of energy in the form of waves.

Tiffany Dong_4e

If you're asking whether or not a quanta can have a value other than a whole number then this is not possible. They can, however, have values that continue to infinity as long as they're whole.

Tiffany Dong_4e

The values will be provided for you on the formula sheet, so you don't have to memorize them. However, I would try to memorize ones that reoccur often like Planck's constant.

Tiffany Dong_4e

The step-up sessions help me a lot because they go at a slower pace. In workshops, you're expected to know the material.

Tiffany Dong_4e

The actual yield is generally not equal to the theoretical yield because of impurities during experimentation or other factors such as solution staying on the sides of the beaker. In order for the actual yield to equal the theoretical yield, the experiment would need to be executed perfectly.

Tiffany Dong_4e

I was told by my TA that it would definitely be useful to memorize the polyatomic ions, but I don't think they'll be particularly relevant to the test.

Tiffany Dong_4e

Are you allowed to simply calculate the moles of each reactant and then compare them to find the limiting reagent?

Tiffany Dong_4e

I don't know what my problem is, but I seem to always be slightly off the answer. Could I get some advice? For example, I'll calculate the molar mass of C6H12O6 and get 180.14 g/mol rather than 180.15 g/mol like the book says. The way I've been doing it is I keep the values of the atomic masses the ...

Tiffany Dong_4e

How is it possible that Avogadro's Constant can be used to find atoms, molecules, and formula units? Does whichever item you're finding depend on the substance involved in the problem?

Tiffany Dong_4e

I think many people experience test anxiety and that's okay! I usually cope by doing something I enjoy before a test such as playing piano or reading a book. I'm still a first year though so my experience is also limited. I think the best strategy is to simply be prepared. If you feel ready, that sh...

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