CHEMISTRY COMMUNITY

Diana Catapusan 1N

I don't think it would matter that much, but I would write out the entire name just in case and put SN2 in parentheses.

Diana Catapusan 1N

Can someone clarify what it means in the course reader when it says, "More than 2 substituents on ring: compare each number and select name with lowest number"? For the example, the correct answer is 4-ethyl-2-methyl-1-propylcyclohexane, but why would 1-ethyl-3-methyl-4-propylcyclohexane b...

Diana Catapusan 1N

Is it mandatory to always draw the transition state in a reaction diagram? Or would we only draw it if the question specifically asks for it?

Diana Catapusan 1N

Hi, can someone show me how they did #7, I know you use the first order integrated rate law, but when I work it out I am not getting the answer that is posted. First, you need to rearrange the first order integrated rate law and isolate k. (k=ln(A/A 0 )/t) After, plug in each value. k=ln(0.622M/0.7...

Diana Catapusan 1N

Usually, problems will state if they are reversible or irreversible. Some hints to know if they are reversible are when delta S_total is equal to zero, making delta S_system=-delta S_surroundings, and when temperature is constant, while volume increases and pressure decreases. Hope this helps!

Diana Catapusan 1N

When drawing cell diagrams, I think the difference between using a line and comma is due to phase changes. If the element remains in the same phase (ex: aqueous to aqueous), you would use and comma. If the element undergoes a phase change (ex: aqueous to solid), you would use a line. Hope this helps!

Diana Catapusan 1N

I understand that we have to add all the enthalpy values at the end of the problem, but why do we have to reverse one of the reactions? How do you know which one to flip?

Diana Catapusan 1N

This is actually kind of a trick question! It is actually NOT spontaneous at any temperature. When ∆H is positive and ∆S is negative, ∆G is never spontaneous. Hope this helps!

Diana Catapusan 1N

I asked a UA this, and they said we don't have to memorize any bond enthalpies because they should be provided. I would double check this to make sure though!

Diana Catapusan 1N

Are the UA office hours in Hedrick Hall already taking place? If not, when will they begin? Thanks!

Diana Catapusan 1N

At the end of this question, it asks if any of the molecules are "radicals." What exactly are radicals?

Diana Catapusan 1N

I think you would use ferrate instead of iron when the iron atom has an overall negative charge. For example, when the overall compound that includes an iron atom is negative, you wouldn't change it to "ironate," you would change it to ferrate. There are a few other metals, like copper, th...

Diana Catapusan 1N

You would use prefixes bis-, tris-, tetrakis-, etc. when the compound already has another prefix such as di- or tri-. For exmaple, the ligand ethylene di amine has the prefix di-. If there were two of these ligands (en) 2 , then you would use the prefix bis- and name it bisethylenediamine. If there ...

Diana Catapusan 1N

Someone had asked this in lecture and Dr. Lavelle said he will keep us posted if there will be class on that Wednesday. He said it will depend on how far we are on the material, so I'm thinking he will decide closer to Thanksgiving break.

Diana Catapusan 1N

Yes, the * signifies anti-bonding. When calculating bond order, the sigma* or pi* orbitals allow you to recognize the number of electrons in that orbital.

Diana Catapusan 1N

In lecture today, someone asked the same question and Dr. Lavelle did not give a direct answer. He said he will keep us posted next week.

Diana Catapusan 1N

Do you have 11 protons?

Because you're SO-DIUM fine!

Diana Catapusan 1N

Thank you so much, this really helped! :)

Diana Catapusan 1N

A problem I keep having is that I forget when to convert kilograms into grams or milliliters into liters and vice versa. When is it necessary to work in kg or grams? mL or liters? Do you all have any tips on how to remember when to convert units? Thank you!

Diana Catapusan 1N

I think Chapter 1 will also be included on the quiz (as far as we have gone through in Chapter 1 at least). But I have another question, will the quiz be more conceptual or more mathematical? I don't really know how to best prepare myself for the quiz..

Diana Catapusan 1N

I'd like to join the Summit study group! Just let me know when and where. I also think it'd be a good idea to plan the study sessions around the review sessions in Hedrick Hall.

CHEMISTRY COMMUNITY

Search found 21 matches

Re: Bimolecular Nucleophile Substitution

Example on p. 96

Drawing Structures

Re: Quiz 2 Winter 2017

Re: Reversibility

Re: Cell Diagrams

Quiz 1 Preparation #5

Re: Quiz 1 Prep, #8

Re: Memorizing Enthalpies???

UA Office Hours

Final 2012: Q4

Re: Naming Coordination Compounds

Re: Naming Complexes

Re: Class on Wednesday November 23

Re: * and Antibonding

Re: Midterm

Re: Post All Chemistry Jokes Here

Re: Conversions

Conversions

Re: Quiz one topics

Re: Hedrick Summit Study Group Chem 14A