CHEMISTRY COMMUNITY

Rachel Lipman

Yes. Remember in regards to the graphs. It helps!

Rachel Lipman

Is it possible to have negative strain at all?

Rachel Lipman

It is also easy to note that the double bond is what will be broken to provide electrons to the electron deficient molecule (electrophile).

Rachel Lipman

I believe the drawing must be provided in any case this question would come up. The only way to tell the difference is really through the lewis structure of the molecule.

Rachel Lipman

Yes. The only difference with alkenes and cycloalkenes is a double bond. Just keep an eye out for double bonds and then you know to change the ane to ene.

It is also in the reading for chapter 1 assigned for the quiz.

Rachel Lipman

I cannot say for certain if we will need to include conjugated or unconjugated, but just know to label diene for two double bonds and triene for three and so on.

Rachel Lipman

In a question of say "which is more nucleophilic" or say "which is the stronger nucleophile" you must look at polarizability of the elements in question. The higher the polarizability (the more electrons, the more free flowing) the stronger the nucleophile.

Rachel Lipman

Any quick tips on determining whether an element/compound is an electrophile or nucleophile?

Rachel Lipman

Prefixes on the substituents do not affect the order of the substituents in the final compound name. Remember: the substituents are always alphabetical order disregarding their prefixes.

Rachel Lipman

One thing to remember when listing the substituents alphabetically is that no matter the prefix placed in front of the substituent, they are still listed in alphabetical order. In simpler terms, the prefix does not affect the listing order of substituents.

Rachel Lipman

In class today it was mentioned that nucleophiles are basically another term for Lewis bases, so if you can remember that you can make the distinction that nucleophiles are electron rich.

Rachel Lipman

There have been no graph questions in the textbook homework, so I was wondering what some examples might be to prepare should it show up on our quiz?

Rachel Lipman

Thank you so much for the clarification.

Rachel Lipman

In the solutions manual, 15.3 part c is depicted as the second b.

Rachel Lipman

May you further elaborate on what electrophiles are and what are the determining factors?

Rachel Lipman

What type of wording in a question would lead us to use this equation?

Rachel Lipman

Anytime an element is alone such as Ag is the charge is 0? Is that the best way to determine in a situation like this reaction what is the anode and what is the cathode?

Rachel Lipman

When the reaction does not have conducting solids, platinum or graphite, both inert conductors, are incorporated into the cell diagram as an electrode to transfer electrons.

Rachel Lipman

I typically just remember it having the solids on the outermost part of the cell diagram.

Rachel Lipman

LOVE THIS! Thank you for sharing!

Rachel Lipman

That makes complete sense, but say for question 14.3 where S is technically 2- as well as O, how do you determine that in SO42- that S has to have the oxidation number 6+?

Rachel Lipman

This is great! Thank you for sharing these key terms in such a simple and concise way! These terms are essential to memorize for future quizzes and tests.

Rachel Lipman

As Lavelle mentioned in class today, the best way is by determining which element is involved in reduction and which is being oxidized. When it comes to oxidation and reduction determining, you must approach the reaction systematically by determining the compound that when reduced will still allow t...

Rachel Lipman

Pertaining to today's lesson, an extensive property directly involves how much of a something is presented in a reaction, while with an intensive property, the amount present in essentially irrelevant to the concluding calculations.

Rachel Lipman

Is the only way to approach a question asking one to solve for the bond enthalpies by first drawing out the lewis structures and determining where bonds are broken and formed? Is there a simpler way to go about solving these problems? What is the best method overall?

Rachel Lipman

I was just reviewing this question as well, so basically because O2 and N2 are not included in the overall calculation of enthalpy because "by definition, the standard enthalpy of formation of an element in its most stable form is zero."

Rachel Lipman

If q is provided with units including mol-1/grams-1, then incorporating n into the final equation is incorrect. It is essential to look at the units for every calculated value in order to implement the right equations. I suggest ALWAYS writing out units for every number that way it is easy to notice...

Rachel Lipman

Have we seen any examples in the course reader or textbook in which we needed to implement the linear/nonlinear molecule equations?

Rachel Lipman

Thank you Reine. An addition question I have is about calculating bond enthalpies in general. Is it most cases that bonds are broken and new ones formed?

Rachel Lipman

Starting with example (a), I understand the Carbon bonds are being broken, however, I am confused why the solutions manual explains the Carbon-Carbon bonds being broken as triple bonds. When I consult the Mean Bond Enthalpies Table (8.7), there are a few options for Carbon-Carbon bonds. Is there a c...

Rachel Lipman

An endothermic reaction occurs when it takes more energy to break bonds in the reactants than what is released when new bonds for in the products. An exothermic reaction occurs when more energy is released when new bonds form in products than what is used when bonds in the reactants are broken. It i...

Rachel Lipman

I would memorize the 6 strong acids in the course reader, there really are not many more beyond those. (hydrochloric acid - HCl, hydrobromic acid - HBr, hydroiodic acid - HI, sulfuric acid - H2SO4, nitric acid - HNO3, perchloric acid - HClO4).

Rachel Lipman

It pertains the the conjugate seesaw rule: the stronger the acid, the weaker the conjugate base; the stronger the base, the weaker the conjugate acid.

Rachel Lipman

Great thank you. But in other cases the ratio is not always one-to-one? And sometimes A- is not equivalent to H3O+?

Rachel Lipman

When calculating the percentage, it is the concentration of A- divided by the initial concentration of HA times 100%. In the textbook it says it is also H3O+ divided by initial concentration. I am confused because when making the ice block chart, H3O+ is different than A-. Clarification please...

Rachel Lipman

The main ones to note, however, are Iron, Chromium, Cobalt, and Mn, Ni, Cu, Zn.

Rachel Lipman

Are Ka and Kb inversely proportional? I remember going over some aspect of the relationship in class...

Rachel Lipman

Is it then that Ka and Kb are inversely proportional?

Rachel Lipman

Thank you! The case is the same for other anionic elements right? Like cobalt can be cobaltate?

Rachel Lipman

In my discussion section earlier this week, we looked at a coordination compound including Iron (Fe). When we named the structure, rather than labeling it iron, instead we named it using its symbol Fe. I am confused about when you call it by its name and when by its symbol with some prefix attached?

Rachel Lipman

Looking back at my notes from chapter one, I am confused about when to use just E=hv and when to actually use Ephoton = Ek + work function. Can someone please clarify, especially with the midterm question.

Rachel Lipman

Can someone please clarify how Schrodinger wave function ties into Molecular Orbital Theory.

Rachel Lipman

When determining the shape of a compound, how can it be labeled as both tetrahedral and trigonal pyramidal?

Rachel Lipman

How do you determine which numbers to add/subtract when calculating the overall charge in relation to the Lewis Structure?

Rachel Lipman

What's the difference between a cation and an anion?

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