Search found 70 matches

by Evonne Hsu 1J
Sun Jan 17, 2021 2:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling HW Q10
Replies: 2
Views: 21

Sapling HW Q10

Can someone please explain the step-by-step process of this question? Thank you!
by Evonne Hsu 1J
Sun Jan 17, 2021 2:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling HW Q9
Replies: 1
Views: 18

Sapling HW Q9

Can someone please explain the step-by-step process of this question? Thank you!
by Evonne Hsu 1J
Sun Jan 17, 2021 2:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling HW Q8
Replies: 2
Views: 18

Sapling HW Q8

Can someone please explain the step-by-step process of this question? Thank you!
by Evonne Hsu 1J
Sun Jan 17, 2021 2:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling HW Q7
Replies: 3
Views: 31

Sapling HW Q7

Can someone please explain the step-by-step process of this question? Thank you!
by Evonne Hsu 1J
Sun Jan 17, 2021 2:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling HW Q3
Replies: 3
Views: 36

Sapling HW Q3

Can someone please explain the step-by-step process of this question? Thank you!
by Evonne Hsu 1J
Sun Jan 17, 2021 2:44 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling HW Q5
Replies: 1
Views: 23

Sapling HW Q5

Can someone please explain the step-by-step process of this question? Thank you!
by Evonne Hsu 1J
Sun Jan 17, 2021 2:43 pm
Forum: Identifying Acidic & Basic Salts
Topic: Sapling HW Q6
Replies: 3
Views: 21

Sapling HW Q6

Can someone please explain the step-by-step process of this question? Thank you!
by Evonne Hsu 1J
Wed Jan 06, 2021 6:45 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Q10 Part2
Replies: 2
Views: 23

Sapling Q10 Part2

Can someone please explain the step-by-step process for this question? Thank you!
by Evonne Hsu 1J
Wed Jan 06, 2021 6:45 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Q10 Part1
Replies: 2
Views: 14

Sapling Q10 Part1

Can someone please explain the step-by-step process for this question? Thank you!
by Evonne Hsu 1J
Wed Jan 06, 2021 6:44 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Q9
Replies: 3
Views: 36

Sapling Q9

Can someone please explain the step-by-step process for this question? Thank you!
by Evonne Hsu 1J
Wed Jan 06, 2021 6:41 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Reverse Reactions
Replies: 12
Views: 46

Reverse Reactions

Why do we have to take the reciprocal of the Kc/Kp when using the reverse reactions?
by Evonne Hsu 1J
Tue Jan 05, 2021 1:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Textbook Question 5H3)
Replies: 4
Views: 20

Textbook Question 5H3)

Can someone please explain the step-by-step process for this question? Thank you!
by Evonne Hsu 1J
Tue Jan 05, 2021 12:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Textbook Question 5H1)
Replies: 5
Views: 40

Textbook Question 5H1)

Can someone please explain the step-by-step process for this question? Especially for the last 2 equations, thank you!
by Evonne Hsu 1J
Fri Dec 11, 2020 10:53 pm
Forum: Hybridization
Topic: AsF³ Hybridization
Replies: 6
Views: 61

Re: AsF³ Hybridization

I think you are correct that it is sp3. As has 5 valence electrons and F has 7. So 5+7x3= 26 electrons. In general, you can think of having a central atom and know that you only need to pair three atoms around it for this problem because there are only 3 Fs. So knowing that the valence for each F w...
by Evonne Hsu 1J
Fri Dec 11, 2020 10:41 pm
Forum: Hybridization
Topic: AsF³ Hybridization
Replies: 6
Views: 61

AsF³ Hybridization

Why is the hybridization of AsF³ sp³d² ? I thought it should be sp³ only. Can someone please explain in detail because it's really confusing me. Thank you!

IGNORE ME I COPIED THE QUESTION INCORRECTLY! SORRY FOR THE CONFUSION ^^
by Evonne Hsu 1J
Fri Dec 11, 2020 8:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Why is CH2Cl2 polar
Replies: 6
Views: 44

Re: Why is CH2Cl2 polar

The dipoles for this particular Lewis Structure of the compound do not cancel out, therefore this compound would be considered polar. A reminder is that you should always draw out the lewis structure before determining its polarity unless you are extremely familiar with the structure of the compound.
by Evonne Hsu 1J
Fri Dec 11, 2020 8:44 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Viscosity
Replies: 22
Views: 571

Re: Viscosity

I believe viscosity means how easily a liquid flows. A liquid will be thicker and not flow as quickly when intermolecular bonds are stronger. When a liquid has a high viscosity (flow more slowly), it means there is a lot of friction in the liquid.
by Evonne Hsu 1J
Fri Dec 11, 2020 8:41 pm
Forum: Bond Lengths & Energies
Topic: Boiling vs. Melting Point
Replies: 15
Views: 102

Re: Boiling vs. Melting Point

Stronger IMFs will definitely result in higher melting and boiling points. The boiling point is defined by a compound changing from liquid to gas phase while the melting point is a compound changing from the solid to liquid phase.
by Evonne Hsu 1J
Fri Dec 11, 2020 8:39 pm
Forum: Calculating the pH of Salt Solutions
Topic: Solving PH/PoH
Replies: 11
Views: 86

Re: Solving PH/PoH

I believe the final will definitely test us on concepts and questions in regards to pH, pOH, [H+],[OH-], etc. Doing the textbook questions will definitely benefit you as well.
by Evonne Hsu 1J
Fri Dec 11, 2020 8:38 pm
Forum: Coordinate Covalent Bonds
Topic: Definition
Replies: 4
Views: 35

Re: Definition

I believe ligands are compounds that are bonded to the transition metal, which forms a coordination compound.
by Evonne Hsu 1J
Thu Dec 10, 2020 4:44 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Sapling HW Q5 Part 4
Replies: 1
Views: 14

Sapling HW Q5 Part 4

Can someone please explain the according steps to this question? Thank you!
by Evonne Hsu 1J
Thu Dec 10, 2020 4:44 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Sapling HW Q5 Part 3
Replies: 1
Views: 22

Sapling HW Q5 Part 3

Can someone please explain the according steps to this question? Thank you!
by Evonne Hsu 1J
Thu Dec 10, 2020 4:43 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Sapling HW Q5 Part 2
Replies: 1
Views: 33

Sapling HW Q5 Part 2

Can someone please explain the according steps to this question? Thank you!
by Evonne Hsu 1J
Thu Dec 10, 2020 4:42 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Sapling HW Q5 Part 1
Replies: 2
Views: 13

Sapling HW Q5 Part 1

Can someone please explain the according steps to this question? Thank you!
by Evonne Hsu 1J
Mon Dec 07, 2020 4:42 pm
Forum: Identifying Acidic & Basic Salts
Topic: Difference between pH, pKa, and Ka
Replies: 3
Views: 36

Difference between pH, pKa, and Ka

What is the difference between pH, pKa, and Ka? And how do you use the values of each to determine whether an acid is neutral or negatively charged?
by Evonne Hsu 1J
Wed Nov 25, 2020 5:52 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination number
Replies: 9
Views: 73

Re: Coordination number

Yes, you do count the number of bonds for number of ligands. This means double bonds as 2 bonds and triple bonds as 3 bonds, etc.
by Evonne Hsu 1J
Wed Nov 25, 2020 5:50 pm
Forum: Naming
Topic: Ethylene Diamine Tetra Acetate
Replies: 6
Views: 29

Re: Ethylene Diamine Tetra Acetate

I don't believe naming was in this week's lecture, but it might appear in the following weeks. I would say not to worry too much about it, since Dr.Lavelle would probably provide us with formulas and chemical names on the final exam.
by Evonne Hsu 1J
Wed Nov 25, 2020 5:48 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Cisplatin vs. Transplatin
Replies: 4
Views: 41

Re: Cisplatin vs. Transplatin

Cl atoms need to be on the same side (cis) instead of the opposite side (cis) because they need to be displaced by C-G in the DNA in order to stop cancer cell replication. This process would also eliminate some healthy cells, but after all cancerous cells replicate at a much higher rate than healthy...
by Evonne Hsu 1J
Wed Nov 25, 2020 5:45 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation Number of Transition Metals
Replies: 3
Views: 32

Re: Oxidation Number of Transition Metals

Cobalt had a charge of 2+ because the whole molecule has a neutral charge. In order to balance out the 2 Cl atoms each with a -1 charge, the Co atom must have a 2+ charge.
by Evonne Hsu 1J
Wed Nov 25, 2020 5:40 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Cisplatin and Chelating Ligands
Replies: 1
Views: 10

Re: Cisplatin and Chelating Ligands

I believe it is a bidentate ligand since two Cl are shared with the transition metal, and ligands are anything that is bonded to the transition metal as well.
by Evonne Hsu 1J
Wed Nov 25, 2020 5:36 pm
Forum: Hybridization
Topic: Long Pairs/Double & Triple Bonds
Replies: 9
Views: 58

Long Pairs/Double & Triple Bonds

When determining the hybridization of molecules, do we take into account lone pairs or double and triple bonds? I'm still very confused about determining hybridization.
by Evonne Hsu 1J
Wed Nov 25, 2020 5:34 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: When Ligands appear?
Replies: 3
Views: 33

When Ligands appear?

Can someone please explain when and where ligands appear?
by Evonne Hsu 1J
Mon Nov 16, 2020 3:36 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: Attractive Forces in Atoms & Molecules
Replies: 3
Views: 28

Attractive Forces in Atoms & Molecules

How do you determine when you have Ion-Ion/Ion-Dipole/Dipole-Dipole/Dipole-Induced Dipole/Hydrogen-Bonding/London Dispersions in certain atoms or molecules? I'm especially confused about the attractive forces related to dipoles. How do you differentiate between the 3 dipole forces (Ion-Dipole/Dipole...
by Evonne Hsu 1J
Mon Nov 16, 2020 3:33 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: States of Atoms & Molecules
Replies: 1
Views: 26

States of Atoms & Molecules

How does the polarizability of atoms and molecules affect their state (solid/liquid/gas) at room temperature and how is the boiling point and melting points related as well?
by Evonne Hsu 1J
Mon Nov 16, 2020 3:30 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Cations vs Anions
Replies: 1
Views: 23

Cations vs Anions

What is the general rule in the trend of polarizability in cations and anions? How are they different? Also, what do electronegativity and electron affinity have to do with polarizability in molecules?
by Evonne Hsu 1J
Mon Nov 16, 2020 3:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bonding
Replies: 5
Views: 47

Bonding

I'm sure Dr.Lavelle has gone over this in one of his lectures, but I'm still confused about when to use a single/double/triple bond and when to just leave it as a lone pair. I realize that there are thousands of compounds with a lot of exceptions but what is the general rule to look out for when dra...
by Evonne Hsu 1J
Tue Nov 10, 2020 1:14 pm
Forum: Lewis Structures
Topic: Sapling HW Q9
Replies: 1
Views: 18

Sapling HW Q9

Can someone please explain the ways of determining Lewis structures in this question?
by Evonne Hsu 1J
Tue Nov 10, 2020 1:13 pm
Forum: Lewis Structures
Topic: Sapling HW Q9
Replies: 1
Views: 28

Sapling HW Q9

Can someone please explain this question about Lewis Structures and oxidation numbers? Thank you!
by Evonne Hsu 1J
Tue Nov 10, 2020 1:12 pm
Forum: Bond Lengths & Energies
Topic: Sapling HW Q9
Replies: 2
Views: 35

Sapling HW Q9

Can someone please explain this question about Lewis Structures and bond length, and also the question below about oxidation numbers? Thank you!
by Evonne Hsu 1J
Tue Nov 10, 2020 1:10 pm
Forum: Resonance Structures
Topic: Sapling HW Q9
Replies: 2
Views: 12

Sapling HW Q9

Can someone please explain this question about formal charges and resonance structures? Thank you!
by Evonne Hsu 1J
Tue Nov 10, 2020 1:09 pm
Forum: Lewis Structures
Topic: Sapling HW Q4
Replies: 1
Views: 24

Sapling HW Q4

Can someone please explain this question about the bond length and character contributing to the overall molecule structure? Thank you!
by Evonne Hsu 1J
Tue Nov 10, 2020 1:08 pm
Forum: Lewis Structures
Topic: Sapling HW Q4
Replies: 9
Views: 104

Sapling HW Q4

Can someone please explain this question about bond length statements?
by Evonne Hsu 1J
Tue Nov 10, 2020 1:07 pm
Forum: Lewis Structures
Topic: Sapling HW Q4
Replies: 3
Views: 48

Sapling HW Q4

Can someone please explain this question in regard to the resonance structures of the carbonate ion? Thank you!
by Evonne Hsu 1J
Tue Nov 10, 2020 1:05 pm
Forum: Lewis Structures
Topic: Sapling HW Q4
Replies: 1
Views: 21

Sapling HW Q4

Can someone please explain how to draw the resonance structures for the carbonate ion? Thank you!
by Evonne Hsu 1J
Fri Nov 06, 2020 1:17 pm
Forum: Lewis Acids & Bases
Topic: Octet question
Replies: 7
Views: 63

Re: Octet question

Yes! There are a lot of exceptions for atoms that do not have an octet, as discussed in Lavelle's lectures. For example, N, S, Be, etc.
by Evonne Hsu 1J
Fri Nov 06, 2020 1:15 pm
Forum: General Science Questions
Topic: Grade Breakdown
Replies: 32
Views: 351

Re: Grade Breakdown

I think on the syllabus it says all the points added up which includes chemistry community, sapling hw, midterm 1 & 2, and a final to a total of 500 pts (if I recall correctly).
by Evonne Hsu 1J
Fri Nov 06, 2020 1:12 pm
Forum: SI Units, Unit Conversions
Topic: Modules This Week
Replies: 9
Views: 113

Re: Modules This Week

I don't think he's posting any of the modules on his website anymore :( I also really enjoyed them
by Evonne Hsu 1J
Fri Nov 06, 2020 1:11 pm
Forum: Student Social/Study Group
Topic: Syllabus
Replies: 11
Views: 82

Re: Syllabus

The syllabus includes course topics and grade distributions.
by Evonne Hsu 1J
Mon Oct 26, 2020 1:48 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Schrodinger's Equation
Replies: 3
Views: 41

Schrodinger's Equation

Do we need to know how to use Schrodinger's Equation on the upcoming midterm? Also, can someone please explain the theory behind Schrodinger's Equation and what it is used for? I'm a bit confused about it. Thank you!
by Evonne Hsu 1J
Mon Oct 26, 2020 1:41 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Sapling HW Q30
Replies: 2
Views: 26

Sapling HW Q30

Can someone please explain the answer to the order of the atomic radius? Thank you!
by Evonne Hsu 1J
Mon Oct 26, 2020 1:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Petition to Bring Music Back To Lectures [ENDORSED]
Replies: 34
Views: 540

Re: Petition to Bring Music Back To Lectures [ENDORSED]

The music is intriguing and it always makes me look forward to the Chem lectures every week. Keep them going:):):)
by Evonne Hsu 1J
Mon Oct 26, 2020 1:38 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 203
Views: 1293

Re: How are you studying?

I use my notes that were taken in the online modules (pre&post questions), during the lecture, during discussion sessions with TAs, homework q from textbook, sapling questions, and also questions discussed during step-up/UA/Lavelle's office hour sessions. You should be more than prepared by revi...
by Evonne Hsu 1J
Mon Oct 26, 2020 1:35 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Sapling HW Q23
Replies: 1
Views: 36

Sapling HW Q23

Can someone please explain the step by step process of doing this question? Thank you!
by Evonne Hsu 1J
Mon Oct 26, 2020 1:33 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Sapling HW Q21
Replies: 4
Views: 41

Sapling HW Q21

Can someone please explain the order of these elements and what electron affinity has to do with it? Thank you!
by Evonne Hsu 1J
Mon Oct 26, 2020 1:31 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Sapling HW Q20
Replies: 1
Views: 31

Sapling HW Q20

Can someone please explain the reasons behind why oxygen has a lower 1st ionization energy than both nitrogen and fluorine? Thank you!
by Evonne Hsu 1J
Mon Oct 26, 2020 1:30 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Sapling HW Q18
Replies: 1
Views: 18

Sapling HW Q18

Can someone please explain the answer to the order of the atomic radius? Thank you!
by Evonne Hsu 1J
Mon Oct 26, 2020 1:28 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Sapling HW Q17
Replies: 18
Views: 141

Sapling HW Q17

Can someone please explain the answer to the order of the atomic radius? Thank you!
by Evonne Hsu 1J
Mon Oct 26, 2020 1:26 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Sapling HW Q24
Replies: 1
Views: 20

Sapling HW Q24

Can someone please explain why this is the answer to this question?
by Evonne Hsu 1J
Tue Oct 20, 2020 6:34 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Post Module Question #14
Replies: 2
Views: 27

Post Module Question #14

Please explain the answer to this question. Thank you!
by Evonne Hsu 1J
Tue Oct 20, 2020 12:00 pm
Forum: Quantum Numbers and The H-Atom
Topic: Textbook Question 1B.15
Replies: 3
Views: 24

Textbook Question 1B.15

Can someone please explain how to do this question? Thank you!
by Evonne Hsu 1J
Fri Oct 16, 2020 9:29 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Formula Representation
Replies: 2
Views: 25

Rydberg Formula Representation

Does n1 represent the initial e- level and n2 represent the final e- level or is it the other way around? Would the final answer still be the same If the numbers were mixed up?
by Evonne Hsu 1J
Fri Oct 16, 2020 9:21 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Q#41 Atomic Spectra Post Assessment
Replies: 2
Views: 19

Q#41 Atomic Spectra Post Assessment

Please explain the correct answer to this question. Thank you!
by Evonne Hsu 1J
Fri Oct 16, 2020 9:21 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Q#39 Atomic Spectra Post Assessment
Replies: 4
Views: 30

Q#39 Atomic Spectra Post Assessment

Please explain the correct answer to this question. Thank you!
by Evonne Hsu 1J
Fri Oct 09, 2020 4:04 pm
Forum: Properties of Light
Topic: Photoelectron Effect: POST/PRE Module Assessment #23
Replies: 2
Views: 28

Photoelectron Effect: POST/PRE Module Assessment #23

Please state and explain the answer for question 23. Thank you!
by Evonne Hsu 1J
Fri Oct 09, 2020 4:03 pm
Forum: Properties of Light
Topic: Photoelectron Effect: POST/PRE Module Assessment #15
Replies: 4
Views: 39

Photoelectron Effect: POST/PRE Module Assessment #15

Please state and explain the answer to question #15. Thank you!
by Evonne Hsu 1J
Tue Oct 06, 2020 11:43 am
Forum: SI Units, Unit Conversions
Topic: Formula Units
Replies: 8
Views: 68

Re: Formula Units

A Formula Unit is basically the empirical formula of a compound. It is similar to units such as atoms and molecules. You also use Avogadro's number to solve this problem. Hope this helps!
by Evonne Hsu 1J
Tue Oct 06, 2020 11:37 am
Forum: Student Social/Study Group
Topic: Zoom Lectures
Replies: 11
Views: 96

Zoom Lectures

Will there be any "Live" Zoom lectures throughout this quarter or will they all be pre-recorded? Correct me if I'm wrong: only office hours will be live with Dr. Lavelle.
by Evonne Hsu 1J
Tue Oct 06, 2020 11:35 am
Forum: SI Units, Unit Conversions
Topic: Rounding in Between Steps [ENDORSED]
Replies: 22
Views: 204

Rounding in Between Steps [ENDORSED]

Do we enter the exact number (including all the decimals) into the calculator when calculating within steps? Do write down our rounded number, by following the sig figs rules, in between the steps as well or do we only write the final answer as rounded?
by Evonne Hsu 1J
Tue Oct 06, 2020 11:30 am
Forum: Student Social/Study Group
Topic: Textbook Readings on Fundamental Topics
Replies: 5
Views: 57

Textbook Readings on Fundamental Topics

I was wondering if unfamiliar content on the fundamental readings that were never discussed during lectures nor assigned as homework problems would appear on any quizzes, tests, or exams?
by Evonne Hsu 1J
Tue Oct 06, 2020 11:26 am
Forum: Limiting Reactant Calculations
Topic: Textbook Question M19)
Replies: 5
Views: 61

Textbook Question M19)

Can someone please explain the step-by-step process of solving the question below? Thank you so much! M19) Caffeine has a molar mass of 194 g/mol. When 0.376 g of caffeine was burned, 0.682 g of carbon dioxide, 0.174 g of water, and 0.110 g of nitrogen were formed. Determine the empirical and molec...

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