CHEMISTRY COMMUNITY

HoganFenster2E

For this molecule, I know it is staggered but would it also be considered in its anti-conformation since the two largest atoms are opposite of each other?

HoganFenster2E

I am not sure if that is true because in this example from Kahn Academy the double bond got the priority for the lower number.

HoganFenster2E

When commenting on the possible values for standard enthalpies of activation (delta H) and standard entropies of activation (delta S) why are delta H values always unfavorable positive and why are delta S values often unfavorable negative? The book answer key gives a little explanation but I don't r...

HoganFenster2E

Is (3Z, 5E)-3-bromoocta-3,5-diene the same as:
(3Z, 5E)-3-bromo-3,5-octadiene?

In other words, is it ok to say 3,5-octadiene instead of putting the 3,5 between octa and diene?

HoganFenster2E

When do we indicate when an organic compound is Cis or Trans? In all of the solutions for chapter one it is never really indicated.

HoganFenster2E

When do we indicate when an organic compound is Cis or Trans? In all of the solutions for chapter one it is never really indicated.

HoganFenster2E

For the problem:
Consider the reaction A+B-->C+D rate=k[A]squared
The time it takes for [A] to decrease from 1.0 to 0.50M is the same as the time it takes [A] to decrease from 0.50 to 0.25M. True or false?

Why is this false?

HoganFenster2E

For the Cell Diagram in the attached photo, why is Platinum only added to the Cathode and not the Anode? The original reaction was 2NO3- (aq) + 8H+ (aq) +6Hg(l) > 3Hg2 2+ (aq) + 2NO (g) + 4H2O (l)
Also when do we add an electrode like platinum to a cell diagram?

HoganFenster2E

For the questions that have us find the standard reaction Gibbs free energy and give us a reaction, how do we know how many moles to use? Basically, where do we find the amount of moles to use?

HoganFenster2E

When we are calculating change in entropy with a change in volume and temperature of a gas, why do we assume that there is just 1 mole of gas? In the problem we are give the two different volumes and the two different temperatures. We also assume ideal behavior of the gas.

HoganFenster2E

When do we use Q=C x Delta T versus Q=n x C x Delta T? For example in question 8.53 we needed to find the heat released from burning 1.40 grams of CO in a bomb calorimeter and the equation q=C x Delta T was used. Why was this equation used and why do we sometimes include the moles/grams (n) in the e...

HoganFenster2E

When do we know Delta H is pr mole. I though that Delta H was just the energy in Joules, however in homework problem 8.45 the Delta H is per mole according to the solutions manual. Also, how do we know what Delta H is representing in different problems?

HoganFenster2E

For chapter 8, I know we are going somewhat backwards as compared to the book, but what is the order of homework we should do in accordance to the lectures?

HoganFenster2E

My TA threw some Sodium Chloride at me in discussion today...

That's a-salt!

HoganFenster2E

In the attached photo, why is the boxed Lewis Structure incorrect and the one below it correct for the best structure. All of the formal charges are zero in the boxed one. This came from the first final exam in the course reader.

HoganFenster2E

For question 12.67 in the homework, when you are given the molarity and molecular formula, how are we supposed to go about ranking the pH. I was thinking the ice box however the solutions manual does not do this. It seems like it does it a much easier way. Can you rank the pH's just by looking at th...

HoganFenster2E

For the rules on naming, the book has a chart on page 741. However, when I first looked at it it was a little confusing. I found this video and it helped a lot after reading the book chart. It is a bunch of examples and doing them as the video did them helped. https://www.youtube.com/watch?v=RKXYxTO...

HoganFenster2E

In the course reader, it says that H2O's name is aqua, however it also is hydro sometimes. What is the difference between the two and when do I use each?

HoganFenster2E

I know that the higher the bond order the more stable the molecule, but how does number of electrons (perhaps bonded or unbounded) play into how stable a molecule is? The question I am referring to gives both the bond order and number of electrons for a compound and asks for increasing stability, bu...

HoganFenster2E

I think that you usually need to calculate the formal charges. It is a good way to check your work too, especially if the compound has a negative or positive charge, because it must have that charge. Also, a little shortcut is (I'm not sure how helpful this is) that whenever you have an Oxygen with ...

HoganFenster2E

According to the solutions manual chapter three question 45, the boxed lewis structure in the attached image is not a resonance structure. Why not? it has 24 electrons and octets for all the atoms involved.

HoganFenster2E

The course reader does not seem to go into detail for the F-orbital so do we need to know the configurations of atoms lower in the D block with F-orbitals? There seems to be more exceptions (similar to Chromium and Copper maybe) as you move further down in the periodic table. If so, when does the f-...

HoganFenster2E

It is not as periodic as atomic radius or ionization energy, but generally electron affinity is higher for the elements in the top right of the periodic table. However there are a few exceptions like how Carbon's electron affinity is higher than nitrogen's.

CHEMISTRY COMMUNITY

Search found 23 matches

Anti Conformation

Re: Naming priority between double bond and functional group

Question 4.37 in O-Chem Book

Differences in Naming Compounds

Cis- versus Trans-

Cis- versus Trans-

2016 Winter Workbook pg. 36 #10

Adding an Electrode to a Cell Diagram?

Moles for Free Energy

Homework 9.13

Heat Transfer Equations

Delta H and what it represents

Homework Order

Re: Chemistry Jokes

N2O4 Lewis Structure

12.67 Calculating pH from Molarity and Formula

Re: Simply way of how to name complex coordination compounds

Aqua versus Hydro in Coordination Compounds

Bond Order and # of Electrons for stability

Re: Determining Resonance

What is or isn't a Resonance Structure?

Beginning the F orbital for electron configurations

Re: Electron affinity trends