CHEMISTRY COMMUNITY

Luis_Yepez_1F

Addin a catalyst wouldn't affect the equilibrium, rather it would just speed up the forward and reverse reaction.

Luis_Yepez_1F

Work would be equal to zero, since volume is constant.

Luis_Yepez_1F

Only monoatomic constants need to be known.

Luis_Yepez_1F

Yes since if there is no change in pressure, then zero work would be done.

Luis_Yepez_1F

The final exam is cumulative, so yes chemical equilibrium will be one the exam.

Luis_Yepez_1F

The final exam is on march 17th.

Luis_Yepez_1F

You can ignore x when k is less than 1x10^-3

Luis_Yepez_1F

You can use the equation to find any of the variables, so p,V,n and T. R is a constant.

Luis_Yepez_1F

Any reversible reaction is isothermal, but never assume that any isothermal reaction is reversible.

Luis_Yepez_1F

There is no change in energy within a closed system. Since energy can neither leave or enter the system.

Luis_Yepez_1F

When K is less than 10^-3, you can just approximate. Always remember to prove the approximation using the 5% rule.

Luis_Yepez_1F

I'm guessing week 7 discussion sections.

Luis_Yepez_1F

I would focus on the ones showed on the constants page that is given each test. Also as mentioned, we don't need to know any of the ones that have derivatives or the integrals, these serve mainly as proofs.

Luis_Yepez_1F

What do you call an acid with an attitude?

An A-mean-o-acid.

Luis_Yepez_1F

I would look over the equation worksheet, then list out all the constants that aren't listed there and memorize them.

Luis_Yepez_1F

When Dr. Lavelle uses derivatives and integrals, it just a way to show how he was able to derive the equations. They are more just used as proofs. Use the equations that are derived.

Luis_Yepez_1F

It should be in mol/L as it is asking for M or concentration.

Luis_Yepez_1F

Cations from groups 1 and 2 or cations with just a +1 charge are not large enough to have enough of an effect.

Luis_Yepez_1F

You should have your three posts done before 11:59 on the Sunday of that week.

Luis_Yepez_1F

Usually the question will ask you to solve for one or the other.

Luis_Yepez_1F

From now on, homework will be due whenever your discussion section is.

Luis_Yepez_1F

Brackets are primarily used to denote that the element is in concentration, parentheses are just used for partial pressures.

Luis_Yepez_1F

If I remember correctly, ICE tables can be used for both concentrations and partial pressures.

Luis_Yepez_1F

I believe we only need to know the trend of 1st ionization energy for the test, since we haven't really talked too much about the 2nd level.

Luis_Yepez_1F

Vanderwals occur in every molecule, dipole-dipole occurs in polar molecules, and induced-dipole occurs with one polar and non-polar molecule.

Luis_Yepez_1F

As the quarter comes to a close, I want to thank Dr. Lavelle for providing a fun and interesting learning environment at all times throughout the quarter.

Luis_Yepez_1F

Yes, but most of the time it is usually for atoms that are not the central atom within the molecule.

Luis_Yepez_1F

Since it is an ion, the overall FC should not be equal to zero. Ideally, you want the central atom to have an FC=0 and have any charge whether positive or negative on the outer atoms around the central atom.

Luis_Yepez_1F

Thank you so much for providing us with study material :D

Luis_Yepez_1F

You would need the lewis structure before giving an informed answer about the length of the bonds between atoms of certain elements.

Luis_Yepez_1F

Period 3 and above elements can have expanded octets, as well the first four elements, H, He, Li, and Be will try to have 2 e- to finish the first shell rather the 8 e- as it is easier to be stable in this way.

Luis_Yepez_1F

You would label hybridization by drawing the three possible ways BF3 can look like. As shown in the image provided labeled B. You would show these are resonate by using the double sided arrows.

Luis_Yepez_1F

We do not need to know the specific length of a bond, we only need to know the trends of bond lengths.

Luis_Yepez_1F

how do we know the bond length? is it something we have to look up? We do not need to know the exact bond length, we just need to know the trend of the size of bonds. There was an example of this on the midterm with how we have a double and single bond in resonance, which showed that the actual bon...

Luis_Yepez_1F

The next test is on week 9 I believe.

Luis_Yepez_1F

I believe test 3 would be the parts of outline 3 that weren't covered on the midterm and all of outline 4.

Luis_Yepez_1F

You need to post at least three times a week, the deadline being midnight of each sunday.

Luis_Yepez_1F

You would take the percentage of molar mass of each element so in CO2 you would divide 12.011/(12.011+2*15.999), then multiply by how many grams of the molecule you have, you would do this again for the hydrogen in H2O, once you have these two weights of the elements you are looking for, you would a...

Luis_Yepez_1F

As the central atom's FC becomes zero, the more stable the entirety of the molecule becomes.

Luis_Yepez_1F

The basic reason/logic behind it is that as an atom has more electrons, then the radius increases by the shells.

Luis_Yepez_1F

Yes, because intensity is proportional to electrons ejected.

Luis_Yepez_1F

If i remember right, the position of the dots do not matter as long as there are no restrictions such as bonds or e- pairs.

Luis_Yepez_1F

The element with the lowest energy means that it can bond with more elements, which is why it is a great starting point in the center.

Luis_Yepez_1F

The only exception to the octet rule are the first four elements, as they will try to only finish the first shell which only needs two e-.

Luis_Yepez_1F

Q. What do you do with a dead chemist?
A. You Barium.

Luis_Yepez_1F

I believe that each concept will be from the quantum world sections, but you still need to know the basics of from the first test that was given to us.

Luis_Yepez_1F

Usually you can determine which equations you use based on what the question asks and what information is given to you in the problem.

Luis_Yepez_1F

I believe Dr. Lavelle was showing us formal SI units which are multiples of 3 for brevity's sake, however the hectometer is a SI unit.

Luis_Yepez_1F

If the question does not specify which units to use, then usually you would stick with the unit that is given, so picometers.

Luis_Yepez_1F

If I remember correctly, when it comes to a combination of both multiplication/division and addition/subtraction. You would adhere to the addition rule for sig figs.

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