Search found 16 matches
- Sun Mar 19, 2017 1:20 pm
- Forum: *Alkenes
- Topic: Intro to organic chem Ch 1 #12b: cis and trans
- Replies: 1
- Views: 1262
Re: Intro to organic chem Ch 1 #12b: cis and trans
trans and cis naming is for substituents, but that leftmost carbon is part of the chain
- Sat Mar 18, 2017 6:26 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Calculating emf based on the reactants- 2014 Q3
- Replies: 2
- Views: 711
Calculating emf based on the reactants- 2014 Q3
How do you calculate the emf based only on the species? This is from Q3 on 2014 Final, the one with the Pikachu drawing. It asks to pick the chemicals that you can use to produce the highest voltage. How do you know which ones to choose? It later asks for emf of the cell in part D but no voltages we...
- Sat Mar 18, 2017 6:18 pm
- Forum: *Alkenes
- Topic: Naming Alkenes
- Replies: 2
- Views: 1457
Re: Naming Alkenes
it can be either way
- Sat Mar 18, 2017 6:17 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Practice final 2014 Question 3 E
- Replies: 1
- Views: 446
Re: Practice final 2014 Question 3 E
we use log because the rest of biochemistry is done using log base 10, most notably the pH system. it's just a convenience thing and has no real reason other than that. it's entirely arbitrary
- Sat Mar 18, 2017 3:29 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: balancing half-reactions
- Replies: 1
- Views: 387
Re: balancing half-reactions
whatever you end up doing the net emf of the cell has to be positive- in other words, flip the smaller |emf|
- Thu Mar 16, 2017 10:16 pm
- Forum: Phase Changes & Related Calculations
- Topic: Thermodynamics question
- Replies: 1
- Views: 430
Re: Thermodynamics question
Calculate for 25-100 of the water, heat of vaporization for the water
then take that number and solve for the mol of methane gas and change it to grams
then take that number and solve for the mol of methane gas and change it to grams
- Tue Mar 14, 2017 3:15 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Torsional and Steric interactions
- Replies: 1
- Views: 545
Re: Torsional and Steric interactions
torsional strain is referring to rotation- is rotating the bond resisted by the presence of another atom? an easy way to remember is because torsional sounds sort of like torque steric strain, as i understand it, refers to physical proximity, more like a "translational" strain. is this ato...
- Thu Mar 09, 2017 12:34 am
- Forum: *Electrophilic Addition
- Topic: Electrophilic Addition Example in Quiz 3 Prep
- Replies: 2
- Views: 1350
Electrophilic Addition Example in Quiz 3 Prep
Quiz 3 Prep question 5 is a question about cholesterol electrophilic addition. For this problem are we just supposed to memroize the steps and transition states? If we were given an entirely new electrophilic addition example how would we know that it takes two steps to complete? (why does the Br he...
- Thu Feb 23, 2017 12:12 am
- Forum: Experimental Details
- Topic: Each orders' units
- Replies: 3
- Views: 811
Re: Each orders' units
To add, k is just a constant that equates each side of the equation. So if you know the units of K, then you roughly know what each side is made up of and can determine its order that way
- Mon Feb 06, 2017 8:24 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Breaking reaction into reduction and oxidation reaction
- Replies: 1
- Views: 366
Re: Breaking reaction into reduction and oxidation reaction
You just have to know which reactant is oxidized and which is reduced. It sort of splits itself after that because of course the product it produces will be pretty clear (your iron won't become chloride, etc.)
- Mon Jan 30, 2017 9:48 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Methods of Calculating Gibbs Free Energy
- Replies: 2
- Views: 749
Re: Methods of Calculating Gibbs Free Energy
Does the second question not include a temperature in the given information? If it doesn't, then you're sort of forced to use the second method, and vice versa. If they theoretically gave you all the required information then you can use any method.
- Tue Jan 24, 2017 11:17 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Clarification regarding irreversible processes
- Replies: 2
- Views: 513
Re: Clarification regarding irreversible processes
I'm not 100% sure, but I'd lean towards the second response- varying degrees of irreversibility. There isn't really any process in nature I can think of that is physically wholly efficient.
- Tue Jan 17, 2017 10:33 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: 8.19 heat capacity
- Replies: 2
- Views: 417
Re: 8.19 heat capacity
I haven't gotten to this problem yet, but if you can't find something that is meant to be given you can always search it up online. I searched this up and found it as the first result- 0.385 J/(g*degree Celsius)
- Fri Jan 13, 2017 11:10 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Symbols used on thermochemistry?
- Replies: 1
- Views: 1567
Symbols used on thermochemistry?
I understand what most of the symbols mean so far, but what does the degree superscript mean when we write enthalphies? As in H(degree)(sub-f)
- Sat Dec 03, 2016 5:47 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: What elements are included in n=3 L=2?
- Replies: 1
- Views: 2492
What elements are included in n=3 L=2?
If the atomic number n refers to the period that the element is in, and the atomic number L refers to the shells that that element has (where L=0 is a s orbital, L=1 is a p orbital, and L=2 is a d orbital,) what elements have the atomic numbers n=3 and L=2? The third period does not have any element...
- Mon Oct 31, 2016 12:22 am
- Forum: Resonance Structures
- Topic: Question from the quiz
- Replies: 1
- Views: 420
Re: Question from the quiz
You know Iodine must be in the center of the structure because it has a lower ionization energy than fluorine. Then everything else must be evenly separated (and as far apart from each other) as possible as that will result in the most stable formation. Then you calculate the number of electrons thi...