CHEMISTRY COMMUNITY

Jenny2G

Cis means same side which is the same as Z while trans means the opposite side which means E. So cis is always Z and trans is always E.

Jenny2G

Chair will always be the most stable conformation because it requires less energy. The boat conformation needs more energy due to the flagpole interaction and the pairs of eclipsed Rs.

Jenny2G

You need to find the charge on the ion in the reactant and then see the charge change in the product. So if a reactant had cr3+ but had a charge of 2+ in the products it is a reduction because it gained one electron.

Jenny2G

Transition states are when there are the dashed lines indicating broken or formed bonds. They are the middle state between reactants and products. So if the slow step is the first step the graph will have a higher hump on the first transition step.

Jenny2G

In the case that you have given no because it both carbons have the same amount of hydrogens bonded to it.

Jenny2G

Although we only need to know the coursereader ones, it would be a good idea to look at some of the other ones not in the course reader. For instance, if they were used in the textbook practice problems because he likes to use those.

Jenny2G

I'm pretty sure you can get all the points because I don't think they will look at every student to see if they posted once a week. I think they would just see how many posts they made.

Jenny2G

The book explains it. It doesn't start at ethyl because 3,3>1,1. You only assign the lowest numbering to the first alphabetical hydrocarbon when the number total are the same.

Jenny2G

Its hard to explain but I think its because you want the smaller numbers. The other way you would have 2,2-dimethyl rather than 1,1-dimethyl. But it's confusing.

Jenny2G

The hydrogen can't go to the middle one because the bromide needs to go to the carbon in the middle in order for the product to have less dipole moment.

Jenny2G

The show step has two double sided arrows signifying that they can be reversible, one sided arrows means that they are at equilibrium therefore the slow step can have two arrows. It is not possible for the slow step to be at equilibrium.

Jenny2G

I know this is late but when given multiple steps is the overall rate always reliant on the slow step even if the slow step is also the first step and an equilibrium?

Jenny2G

Q: What do you do with a sick chemist?
A: If you can't helium, and you can't curium, then you might as well barium.

Jenny2G

I asked the guy sitting next to me if he had any Sodium Hypobromite…
He said NaBrO

Jenny2G

Q: What do you get when you mix sulfur, tungsten, and silver?
A: SWAG

Jenny2G

Jenny2G

You should also look for the one with higher degeneracy, the number of ways of getting an energy state. Its basically the different ways you can arrange a Lewis structure.

Jenny2G

Jenny2G

An example is coffee in a high-quality thermos or a bomb calorimeter.

Jenny2G

When do chemists tell jokes?
Periodically.

Jenny2G

Q: Did you hear about the man who got cooled to absolute zero?
A: He's 0K now.

Jenny2G

Kc stands for the equilibrium constant for concentration.

Jenny2G

The explanation is on page 161 on the course reader. You can take X out when you know it is very small, so when K is a very small number. The example Lavelle said in class was that if you have a million dollars and you give away $100 you still have around a million dollars and so when finding the co...

Jenny2G

The name helps but you need to know the charge of each element and which is neutral to find the overall charge. Memorize the chart in the course reader because it shows what is negative and what is neutral.

Jenny2G

I don't really understand that. Doesn't that make the nitrogens radical? Also what about the charge? How does the structure translate into plus 2 charge?

Jenny2G

I talked to the counselor and she recommended not taking BL until 3rd year for pre-med students because you want to get all the sciences you need for MCAT by the end of 2nd year. That is if you are not taking a gap year.

Jenny2G

To figure out bond angle just know the molecular shape. Like trigonal bipyramidal have angles of 120, 90, and 180. However, I'm pretty sure you don't need to know bond angles for the midterm however, it would be a good idea to know the names of the molecular shapes as they are in the coursereader ch...

Jenny2G

For Cl- you can just do [Ar] because it has the exact same electron configuration. When chloride gains an electron it will have full orbitals like the noble gas argon.

Jenny2G

When you do a Lewis structure there are different possible bonding pairs like in the NO3- shown on page 5 on chapter 3 in the course reader. Those are resonances.

Jenny2G

What if we forget to post a week? Does that negatively affect my grade?

Jenny2G

Yes! I live in Birch though.....

CHEMISTRY COMMUNITY

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