Search found 39 matches

by Can Yilgor 1D
Sat Nov 28, 2020 9:40 am
Forum: Determining Molecular Shape (VSEPR)
Topic: How do you know if atoms lie in the same plane?
Replies: 5
Views: 16

Re: How do you know if atoms lie in the same plane?

I agree that memorizing the VSEPR chart will help you remember which atoms are on the same plane. However, with any given structure, the key point is to imagine it in 3D. There are some nice simulations online if you would like to check out.
by Can Yilgor 1D
Sat Nov 28, 2020 9:20 am
Forum: Sigma & Pi Bonds
Topic: Delocalized and Localized Bonds
Replies: 4
Views: 11

Re: Delocalized and Localized Bonds

Dr. Lavelle answered this question previously on Chemistry Community. Please see the link below for his answer.

Hope this helps

viewtopic.php?t=32258#:~:text=Localized%20electrons%20exhibit%20normal%20behavior,atom%2C%20it%20visits%20two%20atoms.
by Can Yilgor 1D
Sat Nov 28, 2020 8:40 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Cisplatin Drug formation
Replies: 3
Views: 22

Re: Cisplatin Drug formation

I guess it has something to do with the structure of the guanine nitrogenous base, but I'm not certain and I don't want to confuse anyone. You could see the below link which describes the interaction of cisplatin with DNA, but I think it's hard to understand and well beyond the scope of our course. ...
by Can Yilgor 1D
Sat Nov 28, 2020 1:50 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling Week 7 and Week 8 Question 18
Replies: 7
Views: 51

Re: Sapling Week 7 and Week 8 Question 18

So I believe the general idea is that if there's an even number of carbons, the hydrogens will be in the same plane. From my understanding, it's because in H2CCH2, the pi bond between C=C prevents the two carbon atoms from rotating, so the hydrogens are in the same plane. But with H2CCH2, the middl...
by Can Yilgor 1D
Sun Nov 22, 2020 3:35 am
Forum: Student Social/Study Group
Topic: Grading Scale for Chem14A
Replies: 22
Views: 149

Re: Grading Scale for Chem14A

Grading scales change from class to class, but I think it's reasonable to aim for 90 % and above to get an A. I believe estimating grades can be stressful, so just try to stay motivated and you'll be fine :)
by Can Yilgor 1D
Sun Nov 22, 2020 3:10 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Ion - Ion Interaction as an Intermolecular Force
Replies: 3
Views: 26

Re: Ion - Ion Interaction as an Intermolecular Force

I believe ion-ion interactions lead to an ionic bond. They result from two atoms with differences in electronegativity and opposite charges bonding to one another. Thank you for the clarification. Since we are talking about interactions between atoms, can I still consider ion-ion interactions as ex...
by Can Yilgor 1D
Fri Nov 20, 2020 11:55 pm
Forum: Student Social/Study Group
Topic: post midterm 2
Replies: 27
Views: 236

Re: post midterm 2

The midterm went well, but I have doubts about some of my answers. Do you know if we are going to be able to review our answers after the results are released? I don't think we are going to have the chance to do that since it says "review not permitted" on CCLE. Don't you think it would be...
by Can Yilgor 1D
Thu Nov 19, 2020 7:15 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Ion - Ion Interaction as an Intermolecular Force
Replies: 3
Views: 26

Ion - Ion Interaction as an Intermolecular Force

Do Ion - Ion interactions lead to the formation of ionic bonds? I don't think that this interaction involves the transfer of an electron from a cation to an anion. I would be glad if someone could provide a detailed explanation of the "Ion - Ion interactions" that we have covered in the in...
by Can Yilgor 1D
Thu Nov 19, 2020 7:06 am
Forum: Lewis Structures
Topic: Guidelines on Drawing Lewis Structures
Replies: 4
Views: 29

Guidelines on Drawing Lewis Structures

I know that we need to place the atom with the lowest ionization in the center of our Lewis structures. What is the logic behind this? I would appreciate it if someone could clarify it for me.
by Can Yilgor 1D
Thu Nov 19, 2020 7:00 am
Forum: Lewis Structures
Topic: Electron Configuration; Aufbau Principle
Replies: 5
Views: 51

Re: Electron Configuration; Aufbau Principle

Can I think of the Aufbau Principle as a combination of the Pauli Exclusion Principle and Hund's Rule? My understanding is that we consider the Pauli Exclusion Principle and Hund's Rule while drawing electron configuration models according to the Aufbau Principle. I would be glad if someone could co...
by Can Yilgor 1D
Sun Nov 15, 2020 3:25 pm
Forum: Student Social/Study Group
Topic: Studying Tips
Replies: 23
Views: 86

Re: Studying Tips

I find reviewing the lectures a few days before the test very helpful in refreshing my memory. I generally go over the homework questions multiple times and try to attend Dr.Lavelle's discussion sections.
by Can Yilgor 1D
Sun Nov 15, 2020 3:15 pm
Forum: Student Social/Study Group
Topic: Favorite TV shows
Replies: 142
Views: 488

Re: Favorite TV shows

Breaking Bad and Black Mirror are among my favorites. I started watching Grey's Anatomy, but I am not sure if I will be able to finish all 16 seasons.
by Can Yilgor 1D
Sun Nov 15, 2020 8:55 am
Forum: Lewis Structures
Topic: Sapling HW Q4
Replies: 9
Views: 67

Re: Sapling HW Q4

I am still having trouble understanding the difference between the terms "ample" and "overwhelmingly" bond character. I know that real structures are a blend of resonance structures, but I am unsure about how to connect this idea to the bond character. Any kind of clarification w...
by Can Yilgor 1D
Sun Nov 15, 2020 8:10 am
Forum: Lewis Structures
Topic: how to draw lewis structures w double bonds
Replies: 3
Views: 16

Re: how to draw lewis structures w double bonds

While drawing Lewis structures, we try to minimize the formal charges to obtain a more stable structure. Sometimes, drawing a double bond instead of having a lone pair helps us reduce the formal charge. Also, we need to consider the total number of valence electrons while drawing Lewis structures. H...
by Can Yilgor 1D
Sun Nov 08, 2020 5:00 pm
Forum: Administrative Questions and Class Announcements
Topic: missing discussion
Replies: 8
Views: 52

Re: missing discussion

I think we are encouraged to attend the discussion sessions since we go over useful supplementary materials, but I don't think we earn points for just attending, so I am pretty sure you will not be penalized for just missing a discussion section :)
by Can Yilgor 1D
Sun Nov 08, 2020 4:50 pm
Forum: Bond Lengths & Energies
Topic: bond lengths
Replies: 9
Views: 35

Re: bond lengths

Bond length is defined as the distance between the centers of two covalently bonded atoms. The length of the bond is determined by the number of bonded electrons (the bond order). The higher the bond order, the stronger the pull between the two atoms and the shorter the bond length. Generally, the l...
by Can Yilgor 1D
Sun Nov 08, 2020 4:45 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 4
Views: 31

Re: Electron Affinity

Although electron affinity values generally increase across a period, since nitrogen has a half-filled p subshell it is more stable than carbon. Therefore, carbon has a greater affinity for an electron than nitrogen to become more stable, which is an exception to the general trend.
by Can Yilgor 1D
Sun Nov 08, 2020 4:35 pm
Forum: Trends in The Periodic Table
Topic: Size & Expected Knowledge
Replies: 5
Views: 52

Re: Size & Expected Knowledge

Yes, I believe we are expected to know since we have covered the periodic trends in lectures.
by Can Yilgor 1D
Sun Nov 08, 2020 4:20 pm
Forum: Lewis Structures
Topic: Oxidation Numbers
Replies: 7
Views: 26

Re: Oxidation Numbers

I wouldn't worry about a topic that isn't on the outline, but it would also be useful to read through the chapter in the textbook just to make sure you know the basics.
by Can Yilgor 1D
Sun Nov 08, 2020 4:10 pm
Forum: Coordinate Covalent Bonds
Topic: Definition
Replies: 17
Views: 223

Re: Definition

A coordinate bond (also called a dative covalent bond) is a covalent bond (a shared pair of electrons) in which both electrons come from the same atom. A covalent bond is formed by two atoms sharing a pair of electrons. The atoms are held together because the electron pair is attracted by both of th...
by Can Yilgor 1D
Sun Nov 01, 2020 6:15 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Different Types of Orbitals
Replies: 2
Views: 17

Re: Different Types of Orbitals

A wave function- with quantum numbers n, l, ml- that is a solution of the Schrodinger's Wave Equation is called an orbital. To fully describe the SHAPE and ORIENTATION of an orbital we use quantum numbers. The Angular Momentum Quantum Number (l) describes the SHAPE of the orbitals, which differ for ...
by Can Yilgor 1D
Sun Nov 01, 2020 5:50 pm
Forum: Quantum Numbers and The H-Atom
Topic: Explaining Quantum Numbers
Replies: 2
Views: 37

Re: Explaining Quantum Numbers

Principal Quantum Number (n) determines ENERGY and SIZE of an orbital. Angular Momentum Quantum Number (l) describes the SHAPE of an orbital. Magnetic Quantum Number (ml) labels different orbitals of a subshell. It gives the ORIENTATION of the angular momentum. If we take 4s orbital as an example, n...
by Can Yilgor 1D
Sun Nov 01, 2020 5:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Participation Points [ENDORSED]
Replies: 62
Views: 914

Re: Participation Points [ENDORSED]

Since we could earn maximum of 5 points per week, in order to get the full participation points, you should have at least 20 posts by the end of week 4.
by Can Yilgor 1D
Sun Nov 01, 2020 5:20 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 3
Views: 35

Re: Electron Configuration

The ground state of a quantum mechanics system refers to its lowest energy state (most stable electron arrangement). An excited state is any state with energy greater than the ground state. For example, an oxygen at the ground state has the electron configuration 1s^2 2s^2 2p^4. This is the most sta...
by Can Yilgor 1D
Sun Nov 01, 2020 4:55 pm
Forum: Student Social/Study Group
Topic: Test Scored for Midterm 1
Replies: 49
Views: 346

Re: Test Scored for Midterm 1

Although your final answer could be wrong, following the correct procedure can help you earn partial credit. Let's say you found the correct answer, but forgot to convert it into the units specified in the question; since you have applied the correct method you could still earn some points.
by Can Yilgor 1D
Sun Nov 01, 2020 4:30 pm
Forum: Student Social/Study Group
Topic: Test Scored for Midterm 1
Replies: 49
Views: 346

Re: Test Scored for Midterm 1

I don't think that we will go over each problem one by one, but I am pretty sure TA's can answer questions related to specific problems that were on the midterm.
by Can Yilgor 1D
Sat Oct 31, 2020 2:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Participation Points [ENDORSED]
Replies: 62
Views: 914

Re: Participation Points [ENDORSED]

Yes, we earn our participation points for CHEM 14A by posting on Chemistry Community, but I am not sure if it is the same format for CHEM 14B.
by Can Yilgor 1D
Wed Oct 28, 2020 7:15 am
Forum: Administrative Questions and Class Announcements
Topic: Participation Points [ENDORSED]
Replies: 62
Views: 914

Re: Participation Points [ENDORSED]

If we post less than five times in a week, can we make up for it by posting more the following week?
by Can Yilgor 1D
Wed Oct 28, 2020 7:05 am
Forum: Limiting Reactant Calculations
Topic: M9
Replies: 3
Views: 28

Re: M9

There was one question about constructing a net ionic equation in the assigned textbook problems, so I guess it might also come up in the midterm.
by Can Yilgor 1D
Mon Oct 26, 2020 6:30 am
Forum: Administrative Questions and Class Announcements
Topic: Step Up Sessions
Replies: 71
Views: 4437

Re: Step Up Sessions

I believe Peer Learning Sessions and office hours are happening as usual. However, Dr.Lavelle's discussion sessions on Monday and Wednesday are cancelled for this week.
by Can Yilgor 1D
Tue Oct 20, 2020 1:30 am
Forum: Administrative Questions and Class Announcements
Topic: Constant/ equation sheet on midterm?
Replies: 1
Views: 12

Re: Constant/ equation sheet on midterm?

I believe we are allowed to have the constant/equation sheet on midterm. As Dr.Lavelle said yesterday, he is going to send an email with all the instructions and details related to the midterm, so check your inbox for that :)

Hope this helps
by Can Yilgor 1D
Tue Oct 20, 2020 1:15 am
Forum: Einstein Equation
Topic: Kinetic Energy of an Electron
Replies: 4
Views: 38

Re: Kinetic Energy of an Electron

I believe that the equations are similar. The difference is that Einstein's equation uses a specific speed (c=speed of light), while the kinetic energy formula uses the object's speed. In fact, the two equations are derived from the same equation for total energy. Please see the link below for furth...
by Can Yilgor 1D
Thu Oct 15, 2020 11:45 pm
Forum: Photoelectric Effect
Topic: External Camera
Replies: 11
Views: 108

Re: External Camera

In our discussion section, my TA wasn't sure about using our phones to access Zoom during assessments. However, he told us that he will ask Dr.Lavelle about it. If we were to use our phones, it would be like as you said. We would be using "Respondus" on our computers while showing our work...
by Can Yilgor 1D
Thu Oct 15, 2020 2:00 pm
Forum: Quantum Numbers and The H-Atom
Topic: Writing Electron Configurations 1E.23
Replies: 5
Views: 45

Re: Writing Electron Configurations 1E.23

According to the "Aufbau (building up) principle", electrons fill sub-levels from the lowest energy level upwards. Since the 4s sub-level is lower in energy than the 3d sub-level, it is filled first. In other words, electrons may go into the fourth main energy level before the third main e...
by Can Yilgor 1D
Fri Oct 09, 2020 7:50 am
Forum: Administrative Questions and Class Announcements
Topic: Step Up Sessions
Replies: 71
Views: 4437

Re: Step Up Sessions

You could find the schedule and the zoom links for step up sessions on CHEM 14A website under the section "Peer Learning Sessions and Step Up Program".
by Can Yilgor 1D
Fri Oct 09, 2020 7:20 am
Forum: Empirical & Molecular Formulas
Topic: Calculating Atomic Mass of a Molecule
Replies: 9
Views: 50

Re: Calculating Atomic Mass of a Molecule

As Dr.Lavelle said in one of his lectures, a copy of the periodic table will be given each of us during assessments. Therefore, I guess we will use the values given in that particular periodic table. Also, there is a copy of IUPAC's periodic table on the CHEM 14A website if you would like to refer t...
by Can Yilgor 1D
Fri Oct 09, 2020 7:05 am
Forum: Student Social/Study Group
Topic: Sapling Week One Homework Question
Replies: 9
Views: 87

Re: Sapling Week One Homework Question

Yes, you have multiple tries. As long as you solve all the homework questions you will get the credit for it. It doesn't matter how many times you try to solve a question. The only thing that is important is that you eventually solve all the questions.
by Can Yilgor 1D
Thu Oct 08, 2020 2:21 am
Forum: Student Social/Study Group
Topic: Sapling Week One Homework Question
Replies: 9
Views: 87

Re: Sapling Week One Homework Question

Hi again,
I was trying to be very careful about the significant figures throughout my calculations, but I realized which step I was wrong. I would suggest everyone to think about the significant figures at the very end of the calculations.
by Can Yilgor 1D
Thu Oct 08, 2020 1:50 am
Forum: Student Social/Study Group
Topic: Sapling Week One Homework Question
Replies: 9
Views: 87

Re: Sapling Week One Homework Question

Hi, I have also been trying to solve the last question on the homework. I believe I am following the right procedure, but it seems like I can't find the right answer. I start by multiplying 0.30 ml by 0.81 g/ml in order to find the mass of 2-butanone. Then, I multiply the mass I found by the molar m...

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