Search found 34 matches

by Hailey Kim 3B
Fri Nov 08, 2019 8:13 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Monday Lecture
Replies: 2
Views: 24

Re: Monday Lecture

I don't believe so. I would only worry about the homework due in your discussion class.
by Hailey Kim 3B
Fri Nov 08, 2019 8:07 pm
Forum: Student Social/Study Group
Topic: Class Grading
Replies: 14
Views: 80

Re: Class Grading

Madeline Phan 4H wrote:So for our midterm, we will just get a raw score for now?


Yes. Today in lecture, Professor Lavelle said that midterm scores will be released next Wednesday.
by Hailey Kim 3B
Fri Nov 08, 2019 8:04 pm
Forum: General Science Questions
Topic: Test 2
Replies: 19
Views: 61

Re: Test 2

When is test 2?
by Hailey Kim 3B
Wed Nov 06, 2019 1:12 pm
Forum: Properties of Light
Topic: 1A.15
Replies: 3
Views: 37

Re: 1A.15

How do you know that n1=1?
by Hailey Kim 3B
Tue Nov 05, 2019 6:21 pm
Forum: Administrative Questions and Class Announcements
Topic: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
Replies: 52
Views: 3038

Re: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]

for dino nuggets #4 why is the answer 2 sig figs and not 3? is it because 250 mL has only 2 sig figs? i'm a bit confused if that's the reason or if it's something else - if someone could clarify that would be great! thanks so much Yes, for #4, the answer only has 2 sig figs because 250 mL has only ...
by Hailey Kim 3B
Mon Oct 28, 2019 5:53 pm
Forum: Octet Exceptions
Topic: Unpaired Electrons
Replies: 1
Views: 19

Unpaired Electrons

If you have a compound like ClO, which has 13 valence electrons, why would chlorine have the unpaired electron and not oxygen? What determines which atom gets the unpaired electron?
by Hailey Kim 3B
Mon Oct 28, 2019 3:55 pm
Forum: Lewis Structures
Topic: Resonance Structures
Replies: 2
Views: 15

Resonance Structures

When drawing the possible Lewis Structures for ClNO2, why can only the oxygens be double bonded, and not the chlorine?
by Hailey Kim 3B
Mon Oct 28, 2019 3:51 pm
Forum: Ionic & Covalent Bonds
Topic: 2A.11
Replies: 4
Views: 27

Re: 2A.11

For part a, [Ar]3d^6 has a total of 24 electrons, which is chromium. However, since the unknown metal has an additional 3 electrons, you would find the element that has 27 electrons, which is cobalt. The answer to part a would be Co^3+. You can apply the same process to parts b, c, and d.
by Hailey Kim 3B
Mon Oct 28, 2019 10:57 am
Forum: Lewis Structures
Topic: Exceptions to the Octet Rule
Replies: 3
Views: 18

Exceptions to the Octet Rule

How do you know if an element can exceed the octet rule?
by Hailey Kim 3B
Mon Oct 28, 2019 10:55 am
Forum: Lewis Structures
Topic: Lewis Structure
Replies: 2
Views: 22

Re: Lewis Structure

Yes. Odd-electron molecules, electron-deficient molecules, and hypervalent molecules are all exceptions to the octet rule. An odd number of valence electrons can lead to unpaired electrons, as well as the central atom having more or less electrons needed.
by Hailey Kim 3B
Mon Oct 28, 2019 10:46 am
Forum: Lewis Structures
Topic: BrF3
Replies: 2
Views: 14

BrF3

How do you draw the lewis structure for bromine trifluoride? I know it has 28 valence electrons, but when I draw the lewis structure I can't figure out how to draw the bonds in a way to complete the octet.
by Hailey Kim 3B
Mon Oct 28, 2019 10:34 am
Forum: Lewis Structures
Topic: Central Atoms
Replies: 2
Views: 9

Central Atoms

When drawing lewis structures, how do you know which atom is the central atom? I understand that for CCl4 the central atom would be carbon, but what about for compounds like NHF2?
by Hailey Kim 3B
Sun Oct 27, 2019 10:02 pm
Forum: Lewis Structures
Topic: 2A.11
Replies: 1
Views: 17

2A.11

Which M^3+ ions (where M is metal) are predicted to have the following ground-state electron configurations:
a) [Ar]3d^6
b) [Ar]3d^5
c) [Kr]4d^5
d) [Kr]4d^3

I'm super confused on how to go about this problem.
by Hailey Kim 3B
Sun Oct 27, 2019 9:52 pm
Forum: Lewis Structures
Topic: Electron Configuration
Replies: 3
Views: 20

Electron Configuration

In row 5 on the periodic table, why does the electron configuration for Niobium (Nb) have "5s1" and not"5s2"?
by Hailey Kim 3B
Fri Oct 25, 2019 4:17 pm
Forum: Lewis Structures
Topic: Video Modules
Replies: 11
Views: 58

Video Modules

Does anyone know if Professor Lavelle is planning on uploading more video modules on to his website? Or is the "Heisenberg Uncertainty Principle" going to be the last video?
by Hailey Kim 3B
Fri Oct 25, 2019 4:13 pm
Forum: Lewis Structures
Topic: Transition Elements
Replies: 2
Views: 21

Transition Elements

How do you find the number of valence electrons a transition element has by using the periodic table?
by Hailey Kim 3B
Fri Oct 25, 2019 4:12 pm
Forum: Lewis Structures
Topic: Finding Valence Electrons
Replies: 8
Views: 41

Re: Finding Valence Electrons

An easy way to find the number of valence electrons an element has is to use the periodic table. The group number (column) represents the number of valence electrons, excluding the transition elements in groups 3-12. Group 1 = 1 e- Group 2 = 2 e- Group 13 = 3 e- Group 14 = 4 e- Group 15 = 5 e- and s...
by Hailey Kim 3B
Fri Oct 25, 2019 4:07 pm
Forum: Lewis Structures
Topic: Single or Double Bonds
Replies: 4
Views: 21

Single or Double Bonds

When drawing Lewis Structures, how do you know when you're supposed to use a single or double bond?
by Hailey Kim 3B
Fri Oct 25, 2019 4:02 pm
Forum: Lewis Structures
Topic: Expanded Valence Shells Example
Replies: 2
Views: 13

Re: Expanded Valence Shells Example

Yes. During my lecture class, Professor Lavelle worked the problems out on the board.
by Hailey Kim 3B
Sat Oct 19, 2019 1:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Same spin
Replies: 10
Views: 44

Re: Same spin

When drawing spin, is there a reason why only half of the arrow point is used? I've seen it done both ways. In high school, I was taught to only draw half of the arrow point but Professor Lavelle draws the whole arrow point. I don't think it really matters as long as the arrow is pointing in the ri...
by Hailey Kim 3B
Sat Oct 19, 2019 1:26 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Tips for the Midterm
Replies: 10
Views: 56

Tips for the Midterm

Does anyone have any helpful study tips to prepare for the upcoming midterm? What topics should I review?
by Hailey Kim 3B
Sat Oct 19, 2019 1:21 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Hund's rule
Replies: 5
Views: 19

Re: Hund's rule

Hund's rule states that due to e- repulsion, e- in the same subshell occupy different orbitals with parallel spin. This allows for the lowest energy state. All orbital shells must be occupied by one e- before an orbital can be paired up with two.
by Hailey Kim 3B
Sat Oct 19, 2019 1:15 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Quantum Numbers
Replies: 3
Views: 22

Re: Quantum Numbers

If n=4, there would be four subshells: s, p, d, f.
by Hailey Kim 3B
Sat Oct 19, 2019 1:10 pm
Forum: General Science Questions
Topic: Homework for week 4
Replies: 1
Views: 20

Re: Homework for week 4

Homework for week 4 should be from the problems listed under the Quantum World since we are still covering topics from that unit.
by Hailey Kim 3B
Fri Oct 11, 2019 7:52 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 5
Views: 37

Sig Figs

When using sig figs, are you supposed to keep the same number of sig figs as you work through the problem or do you apply the correct number of sig figs just to the answer?
by Hailey Kim 3B
Fri Oct 11, 2019 7:39 pm
Forum: Properties of Electrons
Topic: where does it travel
Replies: 2
Views: 16

Re: where does it travel

Electrons travel by moving to different orbital levels of an atom.
by Hailey Kim 3B
Fri Oct 11, 2019 7:37 pm
Forum: Student Social/Study Group
Topic: Study Tips
Replies: 43
Views: 223

Re: Study Tips

Personally, I think the videos on Professor Lavelle's website are a great way to review the content we went over in class. I also like to study in groups to avoid procrastination, as well as do practice problems from the textbook to improve my problem-solving skills.
by Hailey Kim 3B
Fri Oct 11, 2019 7:25 pm
Forum: Properties of Electrons
Topic: Electron Energy Levels
Replies: 8
Views: 37

Re: Electron Energy Levels

An electron can only jump to as many energy levels the atom has.
by Hailey Kim 3B
Fri Oct 11, 2019 7:20 pm
Forum: Properties of Light
Topic: Frequency vs. Wavelength
Replies: 15
Views: 70

Re: Frequency vs. Wavelength

Yes, frequency is the amount of waves in a certain amount of time and wavelength is the distance between two waves. Frequency and wavelength have an inverse relationship; therefore, the higher the frequency, the shorter the wavelength.
by Hailey Kim 3B
Fri Oct 04, 2019 7:45 pm
Forum: Empirical & Molecular Formulas
Topic: Chemical Formulas
Replies: 3
Views: 24

Re: Chemical Formulas

There is a certain order the elements should be in. One of the first things my HS chemistry teacher taught us was the "Hill System," which states that carbon atoms should go first, followed by hydrogen atoms, and then all other atoms would be in alphabetical order.
by Hailey Kim 3B
Fri Oct 04, 2019 7:42 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Homework Grading
Replies: 7
Views: 45

Re: Homework Grading

I don't think the TA's will be grading our homework too strictly. I think it is more for our benefit because on the syllabus, it says that 1/8 homework problems will be included in our exams.
by Hailey Kim 3B
Fri Oct 04, 2019 7:37 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: atomic weight, molecular weight, and formula weight
Replies: 2
Views: 17

Re: atomic weight, molecular weight, and formula weight

Atomic weight, or atomic mass, is the mass of an atom. For example, the atomic mass of hydrogen is 1.008 u. Molecular mass is the mass of the molecule as a whole. It is the sum of the atomic weight of each of the atoms in the molecule. For this, we would use the molecular formula. Formula mass is wh...
by Hailey Kim 3B
Fri Oct 04, 2019 7:20 pm
Forum: Administrative Questions and Class Announcements
Topic: using older edition textbook
Replies: 8
Views: 67

Re: using older edition textbook

My TA told my discussion class that it is best if we use the 7th edition of the chemistry textbook because the questions may be numbered differently. I would definitely recommend getting either the 6th or 7th edition!
by Hailey Kim 3B
Fri Oct 04, 2019 7:16 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7569
Views: 1011463

Re: Post All Chemistry Jokes Here

I tried writing jokes about the periodic table...

... but then I realized I wasn't quite in my element.

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