CHEMISTRY COMMUNITY

Odalis Trasvina 1A

On the final exam, on of the questions asked for cel potential but all it gave was the half reactions and the standard cell potentials. How are we supposed to calculate the cell potential if we weren't given the concentrations to find Q? Or by cell potential did they mean standard cell potential?

Odalis Trasvina 1A

In free expansion, is q,w,and h equal to 0? What else applies under free expansion ?

Odalis Trasvina 1A

On one of the final exams, it says that ethane has a higher heat capacity than ethene? I don't understand why. Could someone explain to me why that is ? Thank you.

Odalis Trasvina 1A

A larger delta G^# means that the step takes more energy to happen. So yes, it is less likely to happen if compared to a lower delta G^#

Odalis Trasvina 1A

Thermodynamically stable means that delta G is negative. So when delta G <0 the products are thermodynamically stable. If Delta G>0 the reactants are thermodynamically more stable.

Odalis Trasvina 1A

Will we ever have to name or draw a compound that has a substituent with a double bond? I know that substituents end in -yl but would having a double or triple bond make the substituent -yne or -ene and without the -yl suffix?

Odalis Trasvina 1A

If a molecule has a double and a triple bond, Would that be alkene or alkyne? Or does one overpower the other. I guess what I'm asking is, How would a molecule like this be named.

Odalis Trasvina 1A

The Units for K will always be representative of the order of the reaction (m/s, 1/s, 1/ms, 1/m2s, etc) . The units of the reaction rate will always be Molarity/Seconds (m/s)

Odalis Trasvina 1A

The a is the coefficient.

Odalis Trasvina 1A

In the course reader, it says that pre equilibrium approach is easier than steady state but less flexible. What does that mean? Also, What is steady state approach. I understand pre equilibrium but what is steady state?

Odalis Trasvina 1A

Is it arbitrary for which delta G equation you can use? delta G=-nFE
or Delta G=-RTlnK ?

Are we only supposed to use each on certain circumstances?

Odalis Trasvina 1A

So I am not sure where I read a problem like this but it said that the reaction was in space. What type of constrictions does that put on the reaction. If isothermal is equivalent to delta U=0 then what is space equivalent to?

Odalis Trasvina 1A

If volume is constant then work is 0. This is because w=-P(change in)V and if there is no change in volume, then w=p(0), thus making work = 0

Odalis Trasvina 1A

Professor Lavelle usually bullet points the name of the topic the he is discussing at the top of the page. If that doesn't help, You can find the topics related to his lectures by taking important key words from the course reader lecture and finding the page number where they discuss such topics in ...

Odalis Trasvina 1A

So I am not familiar with organic and thermochemistry but I am familiar with the material Professor Lavelle taught in 14A. Does 14A have to do a lot with the material in 14B ? Is 14B material separate from things such as the Rydberg equation, Photons, Molecular orbital, etc?

Odalis Trasvina 1A

if it helps you remember then you can but i've heard from a lot of TA's that you should memorize them. There's many trends that makes it easy to determine which are acids and bases and which are weak and strong (Aka groups 1 and 2, and the COOH and more)

Odalis Trasvina 1A

This is my video Submission. This is a problem from quiz 3 of the workbook on chemical equilibrium. Please comment if you would like.
Thank You,
Odalis Trasvina

Odalis Trasvina 1A

So i've been hearing different things about when to make the assumption about K and when it is small enough to be disregarded in the quadratic steps of finding equilibrium. Is it when K is 10^-4 and less or 10^-5 and less.

Odalis Trasvina 1A

If the concentration of a reactant and product do not change with time, will their ratio change with time?

Odalis Trasvina 1A

So if an element in a molecule has, for example, four bonds attached to it, then its hybridization would be sp^3. This is because sp3 adds up to four bonds. one s and three p's (adding up to four) For any case, You can think of it as s having only one orbital, p having 3 orbitals and d having 5 orbi...

Odalis Trasvina 1A

2.85 In the heavier transition-metal elements, especially the lanthanoids and actinoids, there are numerous exceptions to the regular order of orbital occupation predicted by the building- up principle. Suggest why more exceptions would be noted for these elements.

Odalis Trasvina 1A

Epsom salts consist of magnesium sulfate heptahydrate. Write its formula. (a) How many atoms of oxygen are in 5.15 g of Epsom salts? (b) How many formula units of the compound are present in 5.15 g? (c) How many moles of water molecules are in 5.15 g of Epsom salts?

CHEMISTRY COMMUNITY

Search found 22 matches

2016 Final exam

Free expansion

Ethane vs Ethene

Re: Energy of Transitional States

Re: Stability

Double or Triple Bond as substituents

Double and Triple Bonds

Re: Units?

Re: "a"

Steady State vs Pre Equlibrium

Delta G

Constrictions in Space

Re: Work

Re: Homework

Thermochemistry related to 14A

Re: determining lewis acids and bases

Chemical Equilibrium Problems

When is K small enough to make the assumption

Ratios and Change

Re: Hybridization

Orbital occupation exceptions

Finding number of atoms, formula units and moles