CHEMISTRY COMMUNITY

Jimmy Zhou 3D

It depends on the stability of the conformation that you are trying to draw. You always draw staggered for most stable conformations and always draw elipse for least stable.

Jimmy Zhou 3D

The important part isn't to worry about the Cl but to notice that the C(OH)3 is right next to the CN in guanche conformation. Either structure would have been acceptable as they would be equivalent in stablility in terms of conformation.

Jimmy Zhou 3D

Perhaps it is better to understand the general concept then certain structures. For example hexadecanol is a open chain of 16 carbons with an alcohol fucntional group on carbon 1. We know the naming up to 10 carbons, but we can imply that hexadcanol is 16 carbons using the prefixes. I feel like this...

Jimmy Zhou 3D

I hope this link helps everyone with their naming. It gives a summary of the priorities. Basically if a functional group has higher priority, it'll take precedence in the final naming of that compound. For example, if an alkene has a carboxylic group, let's say Hexene with a carboxylic group. Since ...

Jimmy Zhou 3D

Just wondering,

Do we only need to know how to IDENTIFY nucleophiles and electrophiles for quiz 3 or do we also need to be able to KNOW them based on strength as a nucleophile or electrophile?

Jimmy Zhou 3D

I think what they are trying to say is talking about naming priority, as in, which name comes first. In this case, amines come first so in a molecule like Butanamine, and you have a double bond, the amine would have priority in the naming, and the double bond would be left out. Please correct me if ...

Jimmy Zhou 3D

also if you had a reaction with A+B+C -> products

that could be a third order reaction.

Jimmy Zhou 3D

The rate constant for a third order reaction would also be M-2 s-1 if time was given in seconds.

Jimmy Zhou 3D

Will we have to know calculations regarding a solubility constant Ksp for the test?

Jimmy Zhou 3D

Was wondering if any of you would be able to answer the pikachu question for Winter 2014 Final Part A

Jimmy Zhou 3D

Yeah exactly, basically because the reaction is spontaneous, delta H will also tend to be negative and delta s will be positive so the reaction will be more stable as it moves from an unstable state to a stable state.

Jimmy Zhou 3D

So was wondering if the 2nd equation needed to be balanced cause in its current state it isn't and the problem isn't possible otherwise. Need guidance. 8.55 Barium metal is produced by the reaction of aluminum metal with barium oxide. From the standard reaction enthalpies, 2 Ba + O2 -> 2BaO delta H ...

Jimmy Zhou 3D

The standard unit is Joules for internal energy

Jimmy Zhou 3D

What does Dr. Lavelle mean when he says no derivations on the exam?

Jimmy Zhou 3D

In the H2+I2 -><- 2HI reaction, why does removing a small amount of I2 make the reaction favor neither products or reactants?

Jimmy Zhou 3D

When you are saying Q do you mean Kq? the equilibrium constant. I am going to base my explanation on that fact. If Kq = 1 then the reaction would be at equilibrium and would favor neither products or reactants. The reason being in the calculation of the equilibrium constant ( products/reactants) a v...

Jimmy Zhou 3D

viewtopic.php?f=123&t=16792

I answered the same question on this post already, please refer to it.

Jimmy Zhou 3D

The answer to this question would be high temperature and lower pressure. If we look at the Kp equilibrium constant, it would be products/reactants. Since we want this Kp to be low so that the equation favors the products, we would want equilibrium pressure to be lower. For high temp, notice the cha...

Jimmy Zhou 3D

Could you clarify what you mean by election promotion, I don't remember seeing it in the book or course reader.

Jimmy Zhou 3D

Hi everyone,

I'm not quite sure how to draw this molecule structure. I am unclear as to whether it should have the 2 Cs both bonded to the O in the middle or the two Cs bonded together and the O sticking out from the first C without the Hydrogens.

Jimmy Zhou 3D

Usually, you will know that you have a resonance structure when it is obvious that the double bond in the molecule can be used interchangeably between the other atoms and the central atom.

Jimmy Zhou 3D

What time is the study sesh happening?

Jimmy Zhou 3D

If we look at the Periodic Table, P, S, Cl are on the third period, which means that they can use the 3d orbital to have an expanded octet. That being said, P has 5 Valence e- S has 6 valence e- and Cl has 7 valence e-. The total number of bonds that can be made for P is 5 and for S will be 6. Usual...

Jimmy Zhou 3D

In regards to why it's multiplied by 2. +-0.1 is only one arm of the indeterminancy factor. delta V refers to the both arms or sides of the indeterminancy so we must use 0.2 instead of 0.1 as velocity can either be =0.1 or -0.1.

Jimmy Zhou 3D

Girl are you made of Copper and Tellerium? Because you sure are CuTe

Jimmy Zhou 3D

Hopefully we will also be able to know how many joules per eV to make the conversion

Jimmy Zhou 3D

Thanks for the Responses,

Maggie, your explanation makes sense however, the absorption spectra of the lithium photomultiplier is not known. I assumed from Chem Mod's work that as long as the energy emitted by the laser is higher than that of the work function, it should be fine.

Jimmy Z.

Jimmy Zhou 3D

Question is as follows: In a recent suspense fi lm, two secret agents must penetrate a criminal’s stronghold monitored by a lithium photomultiplier cell that is continually bathed in light from a laser. If the beam of light is broken, an alarm sounds. The agents want to use a handheld laser to illum...

Jimmy Zhou 3D

Hi,
This is Jimmy from Lecture 1

I just got to this problem and I think the problem says 2 equations and not 3. In this case
one of the equations would be N2+O2 -> 2NO and the other would be 2NO + O2 ->2NO2

Hope this helps!

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