CHEMISTRY COMMUNITY

Marco_Romo_1M

Looking at the 3-D model of cyclopropane, there is no conformation that could result in the 3 carbon molecules to not be in the same plane. For cyclobutane, two of the carbons can go up or down together, creating a non planar formation (butterfly) which is more stable because there is less torsional...

Marco_Romo_1M

What determines which molecule on the sp2 hybridized carbon of alkenes on either side gets priority? For example, why is 1.26 trans?

Marco_Romo_1M

Are we supposed to know how to do these problems? If so, what does diene mean?

Marco_Romo_1M

For question 1.16 in the organic chemistry textbook, why is the answer 2-isopropyl-1,1-dimethylcyclopentane and not 1,1-dimethyl-2-isopropylcyclopentane? Following the alphabetical ordering rule

Marco_Romo_1M

When do you put "iso" in front of the name? And does it received alphabetical priority or is it ignored?

Marco_Romo_1M

Never mind I read the answer key in an incorrect order

Marco_Romo_1M

What is an acyclic hydrocarbon. And why does the line structure for 2,3-dimethyloctane look different than a typical alkane.

Marco_Romo_1M

I believe there are 11 carbons in the main chain.

Marco_Romo_1M

Will quiz 3 include the material at the end of the reaction rate chapter (Arrhenius equation)? Or just organic chem and kinetics.

Marco_Romo_1M

Why are the units for the answer of part c different in the textbook versus the solutions manual?(mol vs mmol). And what is the correct answer.

Marco_Romo_1M

Why does the final answer have 6 sig figs?

Marco_Romo_1M

Why can you round e^15 to 10^6?

Marco_Romo_1M

Is the "strength of the reducing metal" the same as "the strength of the reducing agent"(Q 14.25)?

Marco_Romo_1M

Why is this different from listing the strengths of reducing agents? when you look at the E^0 of the cell. Thanks

Marco_Romo_1M

Where does the 0.025 and 693V in the solutions manual come from?

Marco_Romo_1M

Where do you get all that information from by just looking at the question that lists two compounds?

Marco_Romo_1M

Should we know how to solve a redox reaction in both an acidic and basic solution and be able to identify the reducing/oxidizing agents?

Marco_Romo_1M

What's the difference between the EMF(E) and the standard reduction potentials (E not)?

Marco_Romo_1M

I see. In 55, it talks about the formation reaction H2(g) +1/2O2(g)--->H2O(g). Delta Hf and delta Hr are equal because the enthalpy of formation (deltaHf) for O2 and H2 are zero. So Hr is just the Hf of the H2O (g). Hope this helps

Marco_Romo_1M

I'm not sure that I'm following but you don't need to know the delta H_f or delta H_r for entropy. That's for enthalpy. Look as delta S values in the appendix instead. Hope this helps

Marco_Romo_1M

I got delta G of the reaction as -2.7 kJ/mol and the book says -27 kJ/mol. Is this a typo?

Marco_Romo_1M

I am as well.

Marco_Romo_1M

"If SO2F2 adopts a positionally disordered arrangement in its crystal form, what might its residual molar entropy be?". This is question 9.25.

Marco_Romo_1M

Why does COF2 have a higher molar entropy at T=0?

Marco_Romo_1M

Are we supposed to know that the molar heat capacity of a monatomic ideal gas at constant pressure is 5/2 R? And at constant volume is 3/2 R? Where do these numbers come from?

Marco_Romo_1M

What does the c subscript after the standard reaction enthalpy stand for?

Marco_Romo_1M

How can we tell which base is stronger between hypobromite (BrO-) and morphine (C17H19O3N)? Would we just have to rely on the experimentally obtained pKb values?

Marco_Romo_1M

NH4I is the same as NH4+ and I-. Therefore, the NH4+ is the acid because it donates a proton to I- to form HI and I- is a base because it accepts the proton from NH4+. In the process, NH4+ becomes NH3 (ammonia). Hope this helps.

Marco_Romo_1M

Do we need to know Le Chatelier's Principle for quiz 3? I know Dr. Lavelle said we only need to know the first four pages of equilibrium but in the practice quiz that we are turning in to be graded there are problems concerning Le Chatelier's Principle.

Marco_Romo_1M

How would you draw a structure with two dien groups attached to the center metal? And what would be the overall geometry?

Marco_Romo_1M

You can find the most stable Lewis Structure for the molecule and then compute the formal charges of each atom. For molecules like H2O and NH3 they are neutral all around. Hope this helps!

Marco_Romo_1M

You fill in the molecular orbitals from lowest energy to highest energy. Since s orbitals have lower energy than p orbitals, they are filled first. Also, anti-bonding orbitals (denoted with a *) have higher energies than bonding orbitals so they are above bonding orbitals. For atoms who's atomic num...

Marco_Romo_1M

Sigma bonds go hand in hand with single bonds because a sigma bond occurs when two orbitals overlap head to head. Therefore, there is only one area of electron concentration between atoms which constitutes a single bond.

Marco_Romo_1M

Yes. If an electron can be delocalized, then there exists at least one resonance structure. For example, benzene has three double bonds and six carbon atoms. These three double bonds are delocalized because they can exist in another form with the same energy.

Marco_Romo_1M

Yes that is correct. So delta P is 4.02 X 0.2.

Marco_Romo_1M

As far as black-body radiation is concerned, are we only responsible for knowing that it can absorb and emit all frequencies? Or should we also be able to use the different equations regarding black body radiation?

CHEMISTRY COMMUNITY

Search found 36 matches

Re: Rotation of cycloalkanes

Priority in Alkenes

1.21 a b and c

Re: "iso" naming

"iso" naming

Re: 1.13 (a)

1.13 (a)

Re: Determining the Dominance between a Cycloalkane and a Long Carbon Chain

Quiz 3

15.19 Homework

Midterm 2014 #6

Q 14.47 a [ENDORSED]

Question 14.85 Reducing Metal [ENDORSED]

Re: Strongly reducing metal

Nernst Equation

Re: 14.17

Basic vs. Acidic Redox Reactions

EMF vs. Standard Reduction Potentials

Re: 9.57 (b) Help asap and I'll love you

Re: 9.57 (b) Help asap and I'll love you

HW Prob. 11.17

Re: Practice Quiz Answers

Re: chapter 9 question 23

Homework 9.23

Question 8.31

HW Questions #57

Question 12.49

Re: Question 12.9b

Quiz 3 Content [ENDORSED]

Drawing Coordination complexes

Re: Charge on Compounds

Re: How to Fill Out a Molecular Orbital Energy Level Diagram

Re: VSEPR Diagram

Re: Delocalization of Electrons [ENDORSED]

Re: Quiz 1 prep #5 question [ENDORSED]

Testable Black-Body Information [ENDORSED]