For Part B, I don't get how to determine if the structure given for 1,2-dipropylcyclohexane is cis or trans.
In general, how does one determine cis/trans for cyclohexanes?
Thanks.
Search found 25 matches
- Sat Mar 18, 2017 2:54 pm
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: Final 2016 Question 7
- Replies: 2
- Views: 1376
- Tue Feb 28, 2017 3:01 pm
- Forum: *Alkanes
- Topic: 4-ethyl-2,2-dimethylhexane vs 2,2-dimethyl-4-ethylhexane
- Replies: 2
- Views: 1264
4-ethyl-2,2-dimethylhexane vs 2,2-dimethyl-4-ethylhexane
in the "Introduction to Organic Chemistry" workbook on page 8, the book names the alkane 4-ethyl-2,2-dimethylhexane. it says "the substituents are placed alphabetically (ethyl then dimethyl)" but doesn't the letter "d" come before the letter "e"? Is 2,2-dimeth...
- Sat Feb 18, 2017 2:54 am
- Forum: General Rate Laws
- Topic: verifying reaction mechanism of ozone decomposition using pre-equilibrium method [ENDORSED]
- Replies: 2
- Views: 1030
Re: verifying reaction mechanism of ozone decomposition using pre-equilibrium method [ENDORSED]
Actually never mind! There is a pretty good online explanation for how to express [O] in terms of the things actually present in the overall reaction equation. https://chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Kinetics/Rate_Laws/Reaction_Mechanisms/Reaction_Mechanisms/Reaction_Mech...
- Sat Feb 18, 2017 2:47 am
- Forum: General Rate Laws
- Topic: verifying reaction mechanism of ozone decomposition using pre-equilibrium method [ENDORSED]
- Replies: 2
- Views: 1030
verifying reaction mechanism of ozone decomposition using pre-equilibrium method [ENDORSED]
example 15.7 The textbook uses the steady-state method to verify the proposed mechanism with the experimental rate law for the decomposition of ozone. 2 O3 (g) --> 3 O2 (g) experimentally determined rate of decomposition of O3 = k[O3]^2/[O2] mechanism proposed: step 1 (fast) O3 <--> O2 + O step 2 (s...
- Mon Feb 13, 2017 5:45 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: delta U=0
- Replies: 1
- Views: 528
Re: delta U=0
Internal energy is dependent on temperature. In isothermal processes, temperature change is 0, thus internal energy change is also 0 for an ideal gas.
- Mon Feb 13, 2017 5:42 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation Number of Diatomic Oxygen
- Replies: 2
- Views: 1525
Re: Oxidation Number of Diatomic Oxygen
Diatomic molecules have oxidation number of 0
- Sat Feb 11, 2017 2:32 pm
- Forum: Balancing Redox Reactions
- Topic: purpose of C(gr) at anode? [ENDORSED]
- Replies: 2
- Views: 632
purpose of C(gr) at anode? [ENDORSED]
In question 14.11, the cell diagram is C(gr) | H2(g) | H+ (aq) || Cl-(aq) | Cl2(g) | Pt(s)
I was just curious what the purpose of having Carbon in graphite form at the anode? How do we know when to have Pt or C at an electrode?
Thanks
I was just curious what the purpose of having Carbon in graphite form at the anode? How do we know when to have Pt or C at an electrode?
Thanks
- Mon Feb 06, 2017 9:29 pm
- Forum: Balancing Redox Reactions
- Topic: 14.11 e, calculation of standard cell potential [ENDORSED]
- Replies: 1
- Views: 535
14.11 e, calculation of standard cell potential [ENDORSED]
Pt(s) | Sn4+(aq), Sn2+(aq) || Cl-(aq) | Hg2Cl2(s) | Hg(l) I looked up the standard potential for the reduction of Sn4+ to Sn2+, which is -0.14V. However, we know that in this problem since Sn4+ and Sn2+ are on the left side of the diagram, they are at the anode and will be oxidized, not reduced. Thu...
- Thu Jan 26, 2017 12:21 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: 9.75 positional disorder in cis vs trans molecules
- Replies: 1
- Views: 494
9.75 positional disorder in cis vs trans molecules
"Considering positional disorder, would you expect a crystal of octahedral cis-MX2Y4 to have the same, higher, or lower residual entropy than the corresponding trans isomer? Explain your conclusion." The answer key says that for the cis compound there will be 12 different orientations. Bes...
- Mon Jan 23, 2017 12:15 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Changes in Entropy
- Replies: 1
- Views: 440
Re: Changes in Entropy
This is how I interpreted it: The textbook mentions work in two primary ways - one is work at a constant pressure, and the other is work when pressure is not constant. Since chapter 9 typically deals with reversible processes, then the work involved is reversible work where external pressure is not ...
- Mon Jan 23, 2017 12:07 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: the idea behind finding entropy of vaporization
- Replies: 1
- Views: 468
the idea behind finding entropy of vaporization
I'm a bit confused by the textbook's explanation on how one finds the entropy of vaporization of water at 25 deg C and 1 bar (on page 328). The textbook divides the process into three steps: 1. heat the liquid to its normal boiling point, 100 deg C 2. allow it to vaporize 3. then cool the vapor back...
- Sun Jan 22, 2017 10:54 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3876797
Re: Post All Chemistry Jokes Here
Can I survive chemistry this quarter?
Yes I chem.
Yes I chem.
- Sun Jan 15, 2017 3:36 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: constant-volume vs. constant-pressure calorimeters
- Replies: 1
- Views: 456
constant-volume vs. constant-pressure calorimeters
I was reading about constant-volume and constant-pressure calorimeters in the textbook. I was wondering how one knows to distinguish which calorimeter to use in a combustion experiment. For instance, if I wanted to see experimentally find the reaction enthalpy of the combustion of benzene, could I u...
- Wed Nov 30, 2016 6:15 pm
- Forum: *Titrations & Titration Calculations
- Topic: 13.23 How to find final pH?
- Replies: 3
- Views: 659
Re: 13.23 How to find final pH?
Edit: Thanks for the clarification!
- Wed Nov 30, 2016 6:00 pm
- Forum: *Titrations & Titration Calculations
- Topic: 13.23 How to find final pH?
- Replies: 3
- Views: 659
13.23 How to find final pH?
5mL 0.010M NaOH (aq) is titrated with 0.005M HCl (aq) What is the pH of the final solution? I don't understand how the answer key got that the final pH is 2.54, when 30.0 mL of HCl was added. Besides for trial-and-error, I don't really see a way to solve for the final pH. I understand that the pH at...
- Sun Nov 27, 2016 11:30 am
- Forum: Identifying Acidic & Basic Salts
- Topic: #12.75
- Replies: 3
- Views: 1690
Re: #12.75
I'm having difficulty solving this problem as well. The fact that there is a sodium salt of an unknown acid with pH 10.35 seems inherently contradictory to me -- wouldn't that mean it is a base, since the pH is >7? I also don't understand how in the answer key Kb was solved with 0.01 in the denomina...
- Mon Nov 21, 2016 11:05 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Strong Acids
- Replies: 3
- Views: 751
Re: Strong Acids
I think by definition acids are proton donors. If an acid more easily donates a proton, then the stronger it is.
- Tue Nov 15, 2016 1:19 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Calculating the Equilibrium Composition [ENDORSED]
- Replies: 2
- Views: 798
Re: Calculating the Equilibrium Composition [ENDORSED]
In the example you are referencing, the equation is PCl5 <--> PCl3 + Cl2 You are told that initially there is some amount of PCl5 in the reaction vessel. There is no other information in the problem that says the initial amount for PCl3 or Cl2. Thus, one assumes that PCl5 will decompose into the pro...
- Tue Nov 15, 2016 1:15 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: What does TM stand for? pg 118
- Replies: 1
- Views: 537
Re: What does TM stand for? pg 118
Yes, you're right - I'm pretty sure TM stands for transition metal.
- Tue Nov 15, 2016 12:32 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 11.89 HW
- Replies: 2
- Views: 682
11.89 HW
The problem is: "The following plot shows how the partial pressures of reactant and products vary with time for the decomposition of compound A into compounds B and C. All three compounds are gases. Use this plot to do the following: (a) Write a balanced chemical equation for the reaction. (b) ...
- Sat Nov 12, 2016 4:31 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3876797
Re: Post All Chemistry Jokes Here
A bear said "Help, I'm dissolving!"
The person next to it said "But bears are insoluble"
The bear said "That's easy for you to say, you're not polar!"
The person next to it said "But bears are insoluble"
The bear said "That's easy for you to say, you're not polar!"
- Fri Oct 21, 2016 2:04 pm
- Forum: Ionic & Covalent Bonds
- Topic: Drawing Lewis structures
- Replies: 1
- Views: 516
Re: Drawing Lewis structures
Hydrogen has 1 valence electron. Oxygen has 6 valence electrons. H3O+ has 1*3+6-1 valence electrons for a total of 8 valence electrons. I subtracted one because the compound has a 1+ charge. I drew the structure somewhat like this: ////// H ////// | ////H-- O -- H ////// .. * you can also add bracke...
- Sun Oct 09, 2016 4:43 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Homework Question 1.33 [ENDORSED]
- Replies: 2
- Views: 807
Re: Homework Question 1.33 [ENDORSED]
For your second question, regarding how much energy is required to remove the electron from the metal surface:
We recall the equation E = hv.
v is given in the problem as 2.50*10^16 Hz, and h is Plank's constant, or 6.626*10^(-34) J.s
plugging in the values, E = 1.66*10^(-17) J
We recall the equation E = hv.
v is given in the problem as 2.50*10^16 Hz, and h is Plank's constant, or 6.626*10^(-34) J.s
plugging in the values, E = 1.66*10^(-17) J
- Sun Oct 09, 2016 4:29 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Homework Question 1.33 [ENDORSED]
- Replies: 2
- Views: 807
Re: Homework Question 1.33 [ENDORSED]
For your first question, regarding the wavelength of the ejected electron: We can utilize the equation λ = h / p, where h is Plank's constant and p is momentum, or the mass of electron x velocity of electron. λ = (6.626 * 10^(-34)) ------------------------- (9.11 * 10^(-31)) (3.6*10^6)) In the numer...
- Sat Oct 01, 2016 1:30 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Building-Up Principle [ENDORSED]
- Replies: 3
- Views: 4366
Re: Building-Up Principle [ENDORSED]
Hi, I actually had a similar question but here is a helpful video https://www.youtube.com/watch?v=wS5u2jk6W8Y . By looking at the electron configuration of an atom, you can tell if it is in an excited state if it "jumps" orbitals or begins filling in the next orbital before completely occu...