CHEMISTRY COMMUNITY

Lauren Haight 1E

In my opinion, I thought that the final was easier compared to the midterm. However, there were definitely a few that I was unsure on, and in my opinion it wasn't an objectively 'easy' test. I never really know how to feel after his tests until I get the grade back. But overall, better than the midt...

Lauren Haight 1E

Is porphyrin a tetradentate ligand?

Lauren Haight 1E

for mini marshmallow 2b, why is the coordination number for Dihydroxoyoxolatocobalt (III) 4? Is it because oxalato is bidentate and can attach to cobalt at two places?

Lauren Haight 1E

What are we required to know about titrations and the stoichiometric point for the final?

Lauren Haight 1E

Will we be required to know how to calculate pKa and pKb on the final? How do we do this?

Lauren Haight 1E

How can we tell whether a salt is a strong conjugate acid or a strong conjugate base? How can we determine what the salt is a product of.

Lauren Haight 1E

Will we be given ionization constants on the final? Are we able to calculate ionization constants or do they have to be given?

Lauren Haight 1E

The terms monodentate/bidentate don't apply to a molecule like this, they only apply to coordination compounds (transition metal bonded to atom) I don’t think that’s correct, as this molecule is given in a homework problem, and the question asks to identify if it is polydentate. The answer is that ...

Lauren Haight 1E

Can someone explain to me the resonance structures that dictate CO3^2- as being either monodentate and bidentate? I understand why the compound can be bidentate, but I do not understand how it is monodentate.

Lauren Haight 1E

Does anyone have any helpful videos that explains polydentate ligands? I'm pretty confused on this.

Lauren Haight 1E

The question asks Which of the following ligands can be polydentate? If the ligand can be polydentate, give the maximum number of places on the ligand that can bind simultaneously to a single metal center: (a) HN(CH2CH2NH2)2 ; (b) CO32− ; c) H2O; (d) oxalate. How are we able to tell that a ligand wi...

Lauren Haight 1E

Should we know how to calculate pH for weak acids? Or will we only be required to do this for strong acids?

Lauren Haight 1E

Is there only one review session on Coordination Compounds? Do you think there would be any way that Lavelle would add one more on coordination compounds, in case we cannot go to the Wednesday session?

Lauren Haight 1E

How do the structures of acids and bases differ from each other?

Lauren Haight 1E

What are the specific chemical properties of acids, bases and amphoteric compounds?

Lauren Haight 1E

What is an oxidation number? How do you calculate the oxidation number of an atom in a compound? Is there a particular set of rules we can follow to help determine oxidation number?

Lauren Haight 1E

Which coordination compounds did Dr. Lavelle give as examples of coordination compounds used as chemotherapy drugs?

Lauren Haight 1E

On my test, there was a caffeine molecule and students needed to identify hydrogen bonding sites. There were 6, 4 due to lone pairs 4 N atoms and 2 due to lone pairs on 2 O molecules. I have been hearing that DNA was used as an example for other tests, so you may want to double check with someone if...

Lauren Haight 1E

What is the difference between a strong acid and a weak acid? That is, what constitutes a strong acid? What is the rule for strong bases?

Lauren Haight 1E

Can someone please help me distinguish between Lewis Acids and Bases and Bronsted Acids and Bases?

Lauren Haight 1E

Given that Dr. Lavelle assigned the problem and didn't omit this part, I would say know how to name acids and bases to be safe. However, definitely ask your TA as there isn't anything specific on naming acids or bases on Lavelle's test topics for Acids and Bases.

Lauren Haight 1E

Has Dr. Lavelle put out information regarding final review sessions? Does anyone know what day Lyndon's session will be held?

Lauren Haight 1E

Does hydrogen bonding have a greater magnitude than ion-dipole interactions? As in, which is stronger?

Lauren Haight 1E

According to Lavelle, what are the magnitudes of each intermolecular/interionic force?

Lauren Haight 1E

Because I is larger than F, does molecular size trump intermolecular interaction when determining melting points?

Lauren Haight 1E

Why does CHI3 have a higher melting point than CHF3? I would guess that dipoles are stronger in CHF3 due to F's high electronegativity, but this is not the case. Can someone please explain?

Lauren Haight 1E

Are these intermolecular interactions/forces the same? Is London Dispersion just another name for Induced-Dipole-Induced-Dipole interactions?

Lauren Haight 1E

How can we tell the difference between London Dispersion and Induced-Dipole-Induced-Dipole? How can we tell that a molecule has London Dispersion rather than Induced-Dipole-Induced-Dipole, and vice versa?

Lauren Haight 1E

I am confused because the answer key for question 2F3 part b, it says "2 σ-bonds; 1 π-bond; there is also a resonance structure that includes 2 σ-bonds. 2 π-bonds." So, would this mean that we are required to find sigma and pi bonds for resonance structures as well?

Lauren Haight 1E

In resonance structures, the number of sigma and pi bonds are not affected because resonance only affects the location of the electrons on the molecules. I am confused because the answer key for question 2F3 part b, it says "2 σ-bonds; 1 π-bond; there is also a resonance structure that include...

Lauren Haight 1E

Do we have to account for resonance when determining the number of sigma bonds and pi bonds in a molecule?

Lauren Haight 1E

Can someone explain how to differentiate a molecule that has dipole-dipole interaction vs. dipole-induced interactions? I understand that dipole-induced interactions occur when an electric dipole and an instantaneous dipole induces a nonpolar molecule, but how can we identify that a molecule does in...

Lauren Haight 1E

How do we determine the polarity of a molecule based on its Lewis Structure? Do we use formal charge and dipole moments?

Lauren Haight 1E

I am a little confused as to what VSPER actually is and how it allows us to determine molecular shape.

Lauren Haight 1E

I am not sure if there are any specific tricks for doing this, but just remember that when choosing a central atom, choose the atom with the lowest electronegativity; the central atom would be carbon in this case. Count up all valence electrons, and draw atoms around central atoms. I would place the...

Lauren Haight 1E

Considering Lavelle hasn't mentioned anything about lecture being cancelled, I would count on attending class. Especially since in the beginning of the year he mentioned that we have Week 0 to account for the Thursday Friday we miss because of Thanksgiving, but this does not include Wednesday. I wou...

Lauren Haight 1E

Yes. This is because the charge of an ion-dipole moment is greater than dipole-dipole moments.

Lauren Haight 1E

I believe it will be more conceptual, as we haven't learned any new calculations since the midterm.

Lauren Haight 1E

Does anyone know if Lavelle will be posting Test Topics for test 2, as he did for test 1? If not, could anyone please explain what exactly will be on test 2? Thanks.

Lauren Haight 1E

Electron affinity is the amount of energy released when an electron is added to an atom, or how much an “atom wants an electron.” Electronegativity is the level of pull an atom has an electron, in terms of pulling an electron towards it when in a covalent bond.

Lauren Haight 1E

I would assume that you would have to turn in both sets. Although I am not in your discussion, I would tell you to do so, considering that lavelle requires homework each week of the quarter.

Lauren Haight 1E

Will Lyndon still be holding workshop sessions the remainder of the quarter?

Lauren Haight 1E

What dictates London Dispersion? I’m unsure on this.

Lauren Haight 1E

Does anyone know what topics test 2 will cover? I understand it isn’t cumulative, but I am just wondering if we can know in advanced what is covered?

Lauren Haight 1E

Will we be expected to how to draw line structures for organic compounds on the midterm?

Lauren Haight 1E

I meant to say for Bromine.

Lauren Haight 1E

P-block elements starting at row 3 and below can have an expanded octet, meaning they can have more than 8 electrons in their outer shell.

Lauren Haight 1E

The Hamiltonian is an operator that acts on the wave function. When we multiply the hamiltonian and the wave function, we get energy times the wave function. The wave function squared however, is the probability of electron density, or the probability of finding an electron at a certain location in ...

Lauren Haight 1E

Yes. Oxygen and Boron are two exceptions. This is because Oxygen has six valence electrons. In order to become more stable, oxygen would rather lose an electron in order to have a half shell. So, its ionization energy is actually lower than nitrogen. This is the same for Boron. It would like be more...

Lauren Haight 1E

At the cellular level, radicals seek out and oxidize molecules in the cells so that they can become a pair. Scientists believe that radicals are a major cause of aging, as these free radicals cause damage to cells, proteins and DNA.

Lauren Haight 1E

He said that he will be having his regular workshop session Monday night from 6 to 8 at Covel. He said we will review and may go over some of the problems on the review sheet he made us once more.

Lauren Haight 1E

The question asks for you to draw the Lewis Structure for BrF3. Does anyone know why in the answer, for one of the Fluorine atoms, there are only six electrons instead of 8? I understand that there is an expanded octet for Boron, but I am not quite sure why this one atom of fluorine has six electron...

Lauren Haight 1E

We will. Dr. Lavelle explained on our first lecture day that we have class Thursday and Friday Week 0 in order to account for the days we will miss due to Thanksgiving. Because Week 0 does not include Wednesday, I am assuming this means that class will still be held.

Lauren Haight 1E

Does anyone know the general format of the midterm? As in, how many questions there will be and how many questions there will be on each topic we have gone over? Thanks.

Lauren Haight 1E

Checkout Bozeman Science and Professor Dave Explains. I have found their videos especially helpful in explaining certain aspects of Quantum Mechanics.

Lauren Haight 1E

I would check out these two videos from Bozeman Science.

https://www.youtube.com/watch?v=accyCUzasa0
https://www.youtube.com/watch?v=Xh6NRenkdRk

I would also check out this video:
https://www.youtube.com/watch?v=O6g-7rUgrdg

Hope this helps.

Lauren Haight 1E

Does anyone know when Dr. Lavelle will post his video modules for many electron atoms and electron energy shells?

Lauren Haight 1E

I know that the midterm is still about two and a half weeks away, but I was wondering if anyone had any suggestions as to what are good outside resources to utilize when studying for the test. I was also wondering if anyone had any study tips?

Lauren Haight 1E

Dr. Lavelle sent his classes an email stating that he created multiple additional assignments and learning objectives for those who need additional assistance.It looks like on the website if you go to the section "Activities and Due Dates" there are many practice problems that you can choo...

Lauren Haight 1E

I have realized I am looking at the wrong section! Thank you for your help!

Lauren Haight 1E

I purchased the 7th Edition via Sapling. Under the exercise section they are in the format I described above, but when I go to the "Odd-number Answers" section they are posted as Lavelle posted them. Do you know if I am looking at the wrong section for questions?

Lauren Haight 1E

I am having trouble locating problems labeled under "1A" and "1B". Rather, I just get problems under certain sections, but the numbers are labeled continuously, as in 1.1, 1.2,1.3, and so on. Can anyone help me with this?

Lauren Haight 1E

They are due by midnight on Sundays!

Lauren Haight 1E

Does anyone know if the Peer Learning Sessions are available to all students? If not, does anyone know how to become a part of those sessions?

Lauren Haight 1E

In high school, my Chemistry teacher would make us watch Bozeman Science videos to help us with harder chemistry problems. Also if you're looking for a tutor, I know that Alpha Chi Epsilon is a chemistry based fraternity that has free chemistry tutoring for students at UCLA.

Lauren Haight 1E

I am guessing because multi-electron systems are more complex, then you would need a more sophisticated model in order to model them effectively, rather than the simple model discussed in class. I feel that the complexity is the factor.

Lauren Haight 1E

Hi, can someone please help me to distinguish when to use certain equations for the certain aspects of quantum mechanics? As in, which equations to use for energy, electrons and light, and when we cannot interchange these equations? Thank you.

Lauren Haight 1E

The password for Lavelle's website is LL14A19! And for posting, I am pretty sure what you do is go to the topic of interest, such as going to the Fundamentals Topic, and then you can make a new post by clicking "new post." I think that is how you can ask a question under that specific topic.

Lauren Haight 1E

So far, in lecture, discussion and in homework, the state of matter has been given for the molecular compounds we have had to balance in chemical equations, either directly or through context clues in the problem itself. That being said, I would say use these context clues (say, if the problem said ...

Lauren Haight 1E

According to the textbook glossary, formula units are the group of ions that matches the formula of the smallest unit of an ionic compound. In terms of an example, the book provides the following: the formula units for sodium chloride, or NaCl, are the one cation of Na+ and the one of anion Cl-. So ...

Lauren Haight 1E

The textbook defines molecular weight as the numerical value of the molar mass of a molecular compound. It defines molar mass three ways: The mass per mole of atoms of an element.(2) The mass per mole of molecules of a molecular compound. (3) The mass per mole of formula units of an ionic compound. ...

Lauren Haight 1E

I would assume that because Dr. Lavelle has been using this state notation in his notes and it is present in homework problems, he would want us to do the same on homework and tests. From experience in high school chemistry classes, it was required for us to do this in order to receive full credit o...

Lauren Haight 1E

M stands for molarity. Molarity is defined as the number of moles of solute per liter of solution. So, I would say that it is the latter choice, in which units are mol/L.

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