Search found 38 matches

by Jason Knight - 1D
Sun Nov 22, 2020 4:35 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Character
Replies: 28
Views: 81

Re: Covalent Character

Electronegativity is a big tell when analyzing ionic vs covalent character. If the bonded atoms have a large difference in electronegativity, then the molecule has great ionic character. If the molecule has a small difference in electronegativity, then the molecule has greater covalent character.
by Jason Knight - 1D
Sun Nov 22, 2020 4:03 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity of BrF3
Replies: 6
Views: 31

Re: Polarity of BrF3

BrF3 is a polar molecule because the lone pair electrons on the Br atom bend the molecule into a more "T-shaped" orientation. Due to this the three bonding angles are not equal as well.
by Jason Knight - 1D
Sun Nov 22, 2020 3:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pair E-
Replies: 40
Views: 135

Re: Lone Pair E-

Correct, a lone pair does count as its own region of electron density. Electron density counts for both lone pair electrons and bonding pairs.
by Jason Knight - 1D
Sat Nov 21, 2020 2:55 pm
Forum: Ionic & Covalent Bonds
Topic: Molecule size and ionic character
Replies: 10
Views: 48

Re: Molecule size and ionic character

The size of a molecule does have an affect on the ionic character. For reference, the ionic character of a molecule increases with an increase in the difference of electronegativity. A large cation and small anion will create a great difference of electronegativity which results in more ionic charac...
by Jason Knight - 1D
Sat Nov 21, 2020 2:41 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability vs Polarizing Power in anions/cations & bonding
Replies: 9
Views: 40

Re: Polarizability vs Polarizing Power in anions/cations & bonding

Polarizability measures trends of how easily an electron cloud is distorted by an electric field. For example, the more energy shells equals more polarizability. Polarizing power is the tendency of an anion to become polarized by the cation. A more positive charge means a greater polarizing power.
by Jason Knight - 1D
Sat Nov 21, 2020 2:31 pm
Forum: Coordinate Covalent Bonds
Topic: What is a coordinate Covalent Bond
Replies: 11
Views: 37

Re: What is a coordinate Covalent Bond

A coordinate Covalent Bond is a bond formed between a Lewis acid and base. The difference with a coordinate covalent bond is that this type of bonding is when only one atom is involved in the formation of the bond.
by Jason Knight - 1D
Sun Nov 15, 2020 9:14 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Plausible Formal Charges
Replies: 6
Views: 20

Re: Plausible Formal Charges

Correct, the most stable resonance structure would be considered the structure with the formal charge of 0. If 0 is not a consideration, then the formal charge closest to zero is considered the most stable because the structure has the least separation.
by Jason Knight - 1D
Sun Nov 15, 2020 9:10 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: How do you determine whether something is polar or non-polar?
Replies: 3
Views: 14

Re: How do you determine whether something is polar or non-polar?

Non-polar bonds feature an equal sharing of the electrons, typically when the electronegativity of the two atoms are equal. This will result in a symmetrical shape. A polar bond represents a bond that forms when two bonded atoms have an unequal share of electrons. An example of this is water (H20) w...
by Jason Knight - 1D
Sun Nov 15, 2020 9:04 pm
Forum: Ionic & Covalent Bonds
Topic: Hydrogen Bonding
Replies: 13
Views: 39

Re: Hydrogen Bonding

N, O , and F are all electronegative and small relatively, and on the other hand the H atom is highly positive which allows for successful hydrogen bonding.
by Jason Knight - 1D
Sun Nov 15, 2020 8:59 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Lewis acids and bases
Replies: 15
Views: 33

Re: Lewis acids and bases

A Lewis acid is an atom that accepts an electron pair (Acid=Accepts). A Lewis base typically donates an electron pair and will have lone-pair electrons.
by Jason Knight - 1D
Sun Nov 15, 2020 5:17 pm
Forum: Electronegativity
Topic: Sapling Question 13
Replies: 7
Views: 28

Re: Sapling Question 13

For this example, you want to identify the meaning of a hydrogen bond. A hydrogen bond forms between a hydrogen atom bonded to a strongly electronegative atom of a molecule and another strongly electronegative atom within another molecule. Urea has 8 atoms that fit under this criteria, so in this sc...
by Jason Knight - 1D
Sun Nov 08, 2020 7:27 pm
Forum: Student Social/Study Group
Topic: sapling due date
Replies: 7
Views: 29

Re: sapling due date

Week 5 & 6 HW is due Sunday night Week 6. (11/15). To answer your question it is not due tonight.
by Jason Knight - 1D
Tue Nov 03, 2020 5:02 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8214
Views: 1434192

Re: Post All Chemistry Jokes Here

Anyone know any jokes about Sodium? Na
by Jason Knight - 1D
Tue Nov 03, 2020 4:59 pm
Forum: Ionic & Covalent Bonds
Topic: Main group elements
Replies: 8
Views: 61

Re: Main group elements

The main group elements are the elements that belong to the s-block and the p-block on the periodic table. These include groups 1-2 and 13-18, and are often referred to as the representative elements.
by Jason Knight - 1D
Tue Nov 03, 2020 4:56 pm
Forum: Trends in The Periodic Table
Topic: Noble Gas Electron Affinity
Replies: 6
Views: 25

Re: Noble Gas Electron Affinity

Noble gases essentially have zero electron affinity, because an added electron would be in the new energy level due to the fact that noble gases have eight electrons in their valence shell, with the exception of Helium at 2 which is also considered full.
by Jason Knight - 1D
Tue Nov 03, 2020 4:53 pm
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 10
Views: 49

Re: Bond Lengths

The length of a bond typically is in relation to the type of bond associated with the molecule. Double bonds are typically shorter and stronger compared to single bonds. Conceptually, the length of a bond is approximately the sum of the covalent radii of the atoms.
by Jason Knight - 1D
Tue Nov 03, 2020 4:52 pm
Forum: Lewis Structures
Topic: Differences in Bond Length
Replies: 6
Views: 62

Re: Differences in Bond Length

The length of a bond typically is in relation to the type of bond associated with the molecule. Double bonds are typically shorter and stronger compared to single bonds. Conceptually, the length of a bond is approximately the sum of the covalent radii of the atoms.
by Jason Knight - 1D
Tue Nov 03, 2020 4:47 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Why do we use formal charge?
Replies: 14
Views: 78

Re: Why do we use formal charge?

We use formal charge to help identify the number of electrons in the labeled molecule. A positive charge indicates the molecule has a lower amount of electrons present, and a negative charge indicates the molecule has more electrons present in relation to the molecule with no charge.
by Jason Knight - 1D
Fri Oct 30, 2020 8:57 am
Forum: Student Social/Study Group
Topic: Test Scored for Midterm 1
Replies: 49
Views: 343

Re: Test Scored for Midterm 1

My understanding is that no scores will be released until the completion of all discussion sections. This makes the most sense to refrain from any midterm discussion before everyone has had their fair attempt.
by Jason Knight - 1D
Fri Oct 30, 2020 8:46 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations
Replies: 15
Views: 81

Re: Electron Configurations

Dr. Lavelle stated he wants us to become familiar with the more specific way to write and analyze electron configurations because it gives the reader a more informed understanding of what we are labeling.
by Jason Knight - 1D
Fri Oct 30, 2020 8:40 am
Forum: Administrative Questions and Class Announcements
Topic: Fall 2020 Midterm 1 Instructions
Replies: 20
Views: 1026

Re: Fall 2020 Midterm 1 Instructions

If using an external webcam, I highly recommend having zoom installed and ready to go on your phone in case you run into any issues.
by Jason Knight - 1D
Fri Oct 30, 2020 8:33 am
Forum: Student Social/Study Group
Topic: How to relax
Replies: 97
Views: 374

Re: How to relax

After many hours of sitting in front of a screen, I try and get some physical activity and take my eyes off of any sort of electronics which is what I find relaxing. Whether it's working out, going for a run, or just socializing with family, the last thing I do is check my phone or engage in any mor...
by Jason Knight - 1D
Sun Oct 25, 2020 3:37 pm
Forum: Properties of Light
Topic: Wavelength
Replies: 14
Views: 58

Re: Wavelength

Unless specifically stated, typically when solving for wavelength we write our answer in nanometers (x10^-9). In perspective that is one-billionth of a meter.
by Jason Knight - 1D
Sun Oct 25, 2020 3:33 pm
Forum: Properties of Electrons
Topic: Number of Questions of Midterm 1
Replies: 8
Views: 63

Re: Number of Questions of Midterm 1

There are 10 questions on Midterm 1 taken during your discussion in Week 4. In Dr. Lavelles' email, he expressed some questions are more conceptual rather than performing multi-step calculations. A time limit of 50 minutes is allotted.
by Jason Knight - 1D
Sun Oct 25, 2020 3:25 pm
Forum: Photoelectric Effect
Topic: Mass of atoms
Replies: 18
Views: 93

Re: Mass of atoms

It is given we do not need to memorize certain masses for the exam, because they are provided on the calculation sheet that Dr. Lavelle sent out. When problem-solving, convert to kg because that is the SI unit of mass.
by Jason Knight - 1D
Sun Oct 25, 2020 3:20 pm
Forum: Properties of Light
Topic: Midterm
Replies: 42
Views: 368

Re: Midterm

It's my understanding that we will need to have a camera positioned to show our entire workspace to prove you are not cheating with any extra material not permitted on the exam.
by Jason Knight - 1D
Sun Oct 25, 2020 3:13 pm
Forum: DeBroglie Equation
Topic: Purpose of DeBroglie Equation
Replies: 10
Views: 49

Re: Purpose of DeBroglie Equation

The purpose of the DeBroglie Equation is to conceptually elaborate that particles exhibit properties of waves. For example, a particle with a heavier mass will have a shorter wavelength in comparison to a particle with a lighter mass moving at the same velocity.
by Jason Knight - 1D
Sun Oct 18, 2020 11:17 am
Forum: Administrative Questions and Class Announcements
Topic: UCLA Store Updates on Ebook/Sapling access card
Replies: 16
Views: 128

Re: UCLA Store Updates on Ebook/Sapling access card

I also had the same question. Based on your guys responses I guess it wouldn't hurt to shoot the bookstore an email. I ordered my textbook a week before the quarter started and I haven't received any shipment tracking emails.
by Jason Knight - 1D
Sun Oct 18, 2020 11:14 am
Forum: SI Units, Unit Conversions
Topic: Do I need to do very single textbook question on the syllabus?
Replies: 34
Views: 188

Re: Do I need to do very single textbook question on the syllabus?

I believe doing every textbook problem he assigns is a great way to stay on top of the class. Dr. Lavelle made it clear that he is likely to pull out practice problems and assign them within the exams. I think the textbook does a good job of critical thinking through word problems.
by Jason Knight - 1D
Sun Oct 18, 2020 11:12 am
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 196
Views: 851

Re: How are you studying?

I typically gather all due dates and lectures assigned per week and disperse the content little-by-little so I am furthering my understanding of chemistry every day instead of just every other weekday. I believe repetition and completing the practice problems are a great way to be on top of the sche...
by Jason Knight - 1D
Sun Oct 18, 2020 11:08 am
Forum: Trends in The Periodic Table
Topic: Period Trends
Replies: 11
Views: 88

Re: Period Trends

Besides the trends stated, there is also a melting point trend. Generally stating, metals possess a higher melting point in comparison to non-metals. There is not a distinguishable trend on the periodic table to visualize that statement, but it is helpful knowing the properties of metals versus non-...
by Jason Knight - 1D
Sun Oct 18, 2020 11:04 am
Forum: Properties of Electrons
Topic: protons and electrons
Replies: 33
Views: 177

Re: protons and electrons

Similar to what the previous responses have said, it is correct that protons have a greater mass than electrons. The mass of an electron is roughly (1/1836) compared to a proton. On the other hand, protons and neurons typically have very similar if not equal masses.
by Jason Knight - 1D
Tue Oct 06, 2020 9:28 pm
Forum: SI Units, Unit Conversions
Topic: Textbook
Replies: 22
Views: 164

Re: Textbook

Definitely take advantage of the free trial located on his website or via email in the meantime until you get personal access to the textbook. The work is located within the text and the selected problems can be found on the syllabus under "Review of Chemical & Physical Principles."
by Jason Knight - 1D
Tue Oct 06, 2020 9:22 pm
Forum: Balancing Chemical Reactions
Topic: Stoichiometric Coefficients
Replies: 20
Views: 141

Re: Stoichiometric Coefficients

Personally, I would not start the problem without making sure the equation is balanced even if stoichiometric coefficients are present. It would be an undesirable habit to get into, especially when we start learning more advanced topics. I've seen equations that have stoichiometric coefficients alre...
by Jason Knight - 1D
Tue Oct 06, 2020 9:18 pm
Forum: Balancing Chemical Reactions
Topic: Periodic Table
Replies: 50
Views: 406

Re: Periodic Table

Memorizing the periodic table is not required for this course, but I believe becoming familiar with locations and patterns will be helpful moving forward. Dr. Lavelle made a point during one of the lectures that necessary information will be "given" if not explicitly detailed in the proble...
by Jason Knight - 1D
Tue Oct 06, 2020 9:15 pm
Forum: Student Social/Study Group
Topic: Zoom Lectures
Replies: 11
Views: 94

Re: Zoom Lectures

Dr. Lavelle's lectures will be pre-recorded throughout the course. However, he does bring up a good point that office hours, discussion sessions, and Chemistry Community provide a "live" aspect to the class. I like the fact that you can watch his lectures more than just once (since they ar...
by Jason Knight - 1D
Tue Oct 06, 2020 9:09 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 221
Views: 116154

Re: Advice from a Medical Student [ENDORSED]

Thank you for sharing your tips and recommendations! Definitely planning on keeping notes from this class moving forward. It is comforting to hear someone with experience providing insight to new undergraduate students like myself.
by Jason Knight - 1D
Tue Oct 06, 2020 8:58 pm
Forum: Significant Figures
Topic: 5000 vs 5000.0
Replies: 7
Views: 66

Re: 5000 vs 5000.0

Yes, that is a correct statement. A key concept to be looking at in this situation is the presence of the decimal point in 5000.0 versus 5000. The decimal point clarifies precision that the measurement was recorded at exactly 5000.0 rather than just stating 5000 which is vague compared to the other....

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