CHEMISTRY COMMUNITY

AnkitaNair1E

Thank you for pointing out my error. I fixed my explanation so hopefully it will better help students understand.

AnkitaNair1E

And here's a version of E 1-bromo-2chlorethene. 4575447.png Notice how the Bromine and Chlorine are on opposite sides of the double bond? i.e.:Chlorine is above the carbons and Bromine is below. This would be a version of "E" or a molecule where the heaviest molecules are on different side...

AnkitaNair1E

Hi Leornardo! So I think it's important to distinguish that there is a slight difference between cis and trans and a Z and E molecule. Yes, both are used to establish whether molecules are on the same or opposite side, but we use cis/trans in our class to distinguish hydrocarbon chains and we use Z ...

AnkitaNair1E

Hi! So torsional strain happens when a molecule in a the stable staggered form becomes eclipsed because of collisions. When a molecule becomes eclipsed, the hydrogens end up becoming closer to each other. (see the two diagrams of ethane. Notice how the two hydrogens are closer together on the eclips...

AnkitaNair1E

So I guess I'll go first: Dr. Lavelle, Thank you so much for making chemistry super interesting this quarter. I'd previously learned about thermodynamics and rate mechanisms in high school, but it wasn't until this class that I began to really understand and enjoy the material. I'm grateful for all ...

AnkitaNair1E

Hi Everyone,

Since the quarter is almost over and we have just a week of classes left, I thought it might be nice to start a forum on chemistry community where we could express our appreciation for everything Dr. Lavelle has done for us to help us succeed in Chemistry 14B.

AnkitaNair1E

Does anyone know how to view the answers to these problems?

AnkitaNair1E

Thanks Daniel! This is actually super helpful.

AnkitaNair1E

As a first time learner of Organic Chemistry, I had some difficulty attempting to solve problems 1-10 in chapter four. Often times, the problems expect you to know organic chemistry terminology we haven't really discussed in class. For example, Question 4.1 A parts B and C ask us to give the hybridi...

AnkitaNair1E

Hi Melissa, So for #9 they give you four options and we need to find the incorrect one. Let's go through them together. a) When the concentration of the substrate is low, the rate of an enzyme-catalyzed reaction increases with the concentration of the substrate. This one is true because essentially ...

AnkitaNair1E

Hi Jake, So I think another way to understand what a zero order reaction means is to consider that you may have a reaction where the rate of the reaction doesn't depend on how much reactant you have. In other words, it could depend on another variable like enzymes or catalysts. For example, in our b...

AnkitaNair1E

Hi Amy, To answer your question, I think they decided to substitute the delta n value with (77.0408g/18.02g) because that is the change in moles of steam. Essentially what is happening is that as the water gets heated and converts to steam, the steam does work on its surroundings. We know that the w...

AnkitaNair1E

Question 5C asks you to classify whether G, S, H, s, q, and E are state functions or not. One thing I was curious about was why E (electric potential) is not a state function. Would someone mind telling me why?

AnkitaNair1E

Hi Amy! To answer your question, there is a difference between oxidation and reduction as well as oxidizing agents and reducing agents. Oxidation is where a substance loses electrons. For example, in the reaction : H 2 (g) + F 2 (g) --> 2HF(g) Hydrogen is oxidized because it goes from being H 2 to 2...

AnkitaNair1E

Hi Novelpreet, I think the best way to figure out how to use the equations you're confused about is to understand what each equation means. The first equation q=C*delta T essentially tells us that we don't need know how much substance is in the reaction (i.e.: we don't need to know the mass or the #...

AnkitaNair1E

Hi! So essentially you have a container of an ideal gas with a volume V and a vacuum. (For the most part, you can just ignore the vacuum because its just part of the setup and only thing that happens to the vacuum is that it becomes smaller as the ideal gas expands.) This volume is being held by a e...

AnkitaNair1E

In lecture today, we defined enthalpy as the amount of heat absorbed/released in a system where pressure of constant. Given this definition, I'm still having trouble understanding conceptually why enthalpy is a state function. Could someone clarify this for me?

CHEMISTRY COMMUNITY

Search found 17 matches

Re: Z and E

Re: Z and E

Re: Z and E

Re: Torsional Strain [ENDORSED]

Re: Saying Thank You to Dr. Lavelle

Saying Thank You to Dr. Lavelle

Re: Extra Nomenclature Practice

Re: Extra Nomenclature Practice

Approaching Organic Chemistry Problems in the Textbook [ENDORSED]

Re: Quiz #9

Re: Zero Order Classification [ENDORSED]

Re: Winter 2014 Midterm Q3C

Winter 2014 Midterm: Question 5C

Re: Oxidation [ENDORSED]

Re: Heat

Re: Lecture question [ENDORSED]

Understanding why enthalpy is a state function