Search found 16 matches

by jngao1J
Sun Mar 19, 2017 1:20 pm
Forum: *Alkenes
Topic: Intro to organic chem Ch 1 #12b: cis and trans
Replies: 1
Views: 320

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
by jngao1J
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: 326

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...
by jngao1J
Sat Mar 18, 2017 6:18 pm
Forum: *Alkenes
Topic: Naming Alkenes
Replies: 2
Views: 367

Re: Naming Alkenes

it can be either way
by jngao1J
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: 243

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
by jngao1J
Sat Mar 18, 2017 3:29 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: balancing half-reactions
Replies: 1
Views: 159

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|
by jngao1J
Thu Mar 16, 2017 10:16 pm
Forum: Phase Changes & Related Calculations
Topic: Thermodynamics question
Replies: 1
Views: 232

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
by jngao1J
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: 225

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...
by jngao1J
Thu Mar 09, 2017 12:34 am
Forum: *Electrophilic Addition
Topic: Electrophilic Addition Example in Quiz 3 Prep
Replies: 2
Views: 308

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...
by jngao1J
Thu Feb 23, 2017 12:12 am
Forum: Experimental Details
Topic: Each orders' units
Replies: 3
Views: 404

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
by jngao1J
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: 168

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.)
by jngao1J
Mon Jan 30, 2017 9:48 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Methods of Calculating Gibbs Free Energy
Replies: 2
Views: 320

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.
by jngao1J
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: 215

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.
by jngao1J
Tue Jan 17, 2017 10:33 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 8.19 heat capacity
Replies: 2
Views: 214

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)
by jngao1J
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: 220

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)
by jngao1J
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: 450

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...
by jngao1J
Mon Oct 31, 2016 12:22 am
Forum: Resonance Structures
Topic: Question from the quiz
Replies: 1
Views: 183

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...

Go to advanced search