CHEMISTRY COMMUNITY

MBouwman_4A

It may also be helpful to remember that pH + pOH = 14.

MBouwman_4A

The formula for pH is -log[H+] and pOH is -log[OH-]. I don't think we need to know the derivation, but it is helpful to know that pH + pOH = 14

MBouwman_4A

The lower the pH is, the more H+ ions it has, making it more acidic. Higher pHs have a lower H+ concentration and are weaker acids.

MBouwman_4A

Most solutions fall between 0 and 14, there are very few acids that would be negative and very few bases that would fall above 14.

MBouwman_4A

I believe it would be best to memorize the strong acids and strong bases for the final.

MBouwman_4A

I believe you would list the ligands in alphabetical order.

MBouwman_4A

Since CN has a -1 charge, the -4 overall charge is given to calculate the charge of iron (Fe), which is +2.

MBouwman_4A

In the chemical formula, the cation will be listed first followed by the anion.

MBouwman_4A

I think that both suffixes are acceptable, but the -o form would probably be best to use since that is what we are taught in lectures.

MBouwman_4A

I think we would only have to know the general rules for naming coordination complexes.

MBouwman_4A

Axial bonds are parallel to the axis of the ring while equatorial bonds are perpendicular to the axis (at the equator).

MBouwman_4A

I believe you only need to be able to state that the bond angle is less than the expected angle. I don't think you need to give a more exact approximation.

MBouwman_4A

The electronegativity of the atoms can slightly change the bond angles even if two molecules have the same shape.

MBouwman_4A

The VSEPR model stands for the Valence-Shell Electron-Pair Repulsion model. You do not need to have the acronym memorized. However, it may help with your understanding of the concepts of the model.

MBouwman_4A

In order to determine if the molecule is polar or non-polar, you would use the electronegativity of the atoms as well as the Lewis structure. The electronegativity would show you the charges of the bonds and the Lewis structure would show you if the dipoles cancel.

MBouwman_4A

You should draw the Lewis structure so that the sum of the formal charges is the charge of the overall molecule, which may not necessarily be zero.

MBouwman_4A

If the question specifically says to asks to draw resonance structures than you should do so. Otherwise, just draw the most stable Lewis Structure.

MBouwman_4A

Since the central atom is usually the least electronegative, the surrounding atoms would have the charge.

MBouwman_4A

Electrons are shifted toward the more electronegative atom, so the more electronegative atom is the one with the negative charge.

MBouwman_4A

Dr. Lavelle announced that the midterms would be handed back during lecture on Wednesday (11/13).

MBouwman_4A

Correct, covalent bonds occur between two non-metals. This differs from the metal-nonmetal ionic bonds.

MBouwman_4A

Ionic bonds occur between a metal and a non-metal. Covalent bonds result from the bonding of two non-metals.

MBouwman_4A

I believe you can do problems from either section. However, it might be beneficial to focus this week's homework on chemical bonds since it is a new topic.

MBouwman_4A

Since protons and neutrons have the same mass, if they had the same velocity they would also have the same wavelength.

MBouwman_4A

Electronegativity increases from left to right of the periodic table and decreases as you move down a group.

MBouwman_4A

The midterm should cover weeks 1-5, so fundamentals, quantum world, and chemical bonding.

MBouwman_4A

My TA said all of the equations and constants will be provided on exams (same formula sheet as Test 1).

MBouwman_4A

Hertz is a unit of frequency measured as cycles per second.

MBouwman_4A

Since the equation sheet given to us on the first test had many formulas and constants that we didn't need for Test 1, I'm assuming the same sheet will be used for the entire quarter for every exam.

MBouwman_4A

The standard unit for wavelength is meters (m). However it is often shown in problems as picometers (pm), nanometers (nm), or even Angstroms (A).

MBouwman_4A

There are so many resources provided on the class website to help brush up on high school chemistry. Especially the video modules and lectures. Reviewing topics from the textbook will also help knock the rust off.

MBouwman_4A

Thank you for sharing your story! It was so helpful and provided wonderful insight. Your feedback and advice is appreciated!

MBouwman_4A

You don’t have to show as much work. However, it may help so if you make a calculating mistake, graders can see each step and you can get partial credit for completing the steps correctly even with a calculating error.

MBouwman_4A

Week 2 homework can be on the fundamentals or quantum world since lectures are on QW but the test during W2 is on the fundamentals. The Week 3 homework must be on the QW though.

MBouwman_4A

All of the materials for the Tests (1 & 2) and Exams (Midterm & Final) are provided. There is also a conversions/formula sheet on the first page. Also remember to have a scientific calculator instead of a graphing since graphing calculators are not allowed.

MBouwman_4A

Theoretical yield will never be higher than actual yield. Theoretical yield is the result if the reaction is 100% efficient and there are no impurities or errors during the experiment. Theoretical yield represents the maximum yield.

MBouwman_4A

I recommend not studying right before the test starts because it will make you more nervous and also psych you out on the material. I always tell myself that I’ve studied the material well and it helps me feel prepared.

MBouwman_4A

It’s best to round at the very end of the problem once you have an answer so that you are more precise. Rounding during steps in the problem can result in errors.

MBouwman_4A

I think it’s best to show each step since graders can follow along with your work and see if you made a simple calculation error or if you didn’t apply the correct concept/formula for the problem.

MBouwman_4A

Does anyone know of some good video websites or Youtube channels that could help with explaining the introductory material? I feel like I'm more receptive to listening and visual presentations than reading lines from the textbook.

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