CHEMISTRY COMMUNITY

jngao1J

trans and cis naming is for substituents, but that leftmost carbon is part of the chain

jngao1J

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...

jngao1J

it can be either way

jngao1J

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

jngao1J

whatever you end up doing the net emf of the cell has to be positive- in other words, flip the smaller |emf|

jngao1J

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

jngao1J

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...

jngao1J

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...

jngao1J

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

jngao1J

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.)

jngao1J

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.

jngao1J

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.

jngao1J

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)

jngao1J

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)

jngao1J

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...

jngao1J

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...

CHEMISTRY COMMUNITY

Search found 16 matches

Re: Intro to organic chem Ch 1 #12b: cis and trans

Calculating emf based on the reactants- 2014 Q3

Re: Naming Alkenes

Re: Practice final 2014 Question 3 E

Re: balancing half-reactions

Re: Thermodynamics question

Re: Torsional and Steric interactions

Electrophilic Addition Example in Quiz 3 Prep

Re: Each orders' units

Re: Breaking reaction into reduction and oxidation reaction

Re: Methods of Calculating Gibbs Free Energy

Re: Clarification regarding irreversible processes

Re: 8.19 heat capacity

Symbols used on thermochemistry?

What elements are included in n=3 L=2?

Re: Question from the quiz