Search found 53 matches

by Sally kim 4F
Sun Dec 08, 2019 3:35 pm
Forum: Sigma & Pi Bonds
Topic: Sigma Vs Pi
Replies: 10
Views: 190

Re: Sigma Vs Pi

When labeling sigma bonds, label all the single bonds as sigma bonds, and all the remaining double and triple bonds as pi bonds.
by Sally kim 4F
Sun Dec 08, 2019 3:34 pm
Forum: Properties of Light
Topic: Speed of Light
Replies: 7
Views: 200

Re: Speed of Light

Speed of light, c, in the equation is m/s!
by Sally kim 4F
Sun Dec 08, 2019 3:33 pm
Forum: Significant Figures
Topic: pH sig figs
Replies: 9
Views: 199

Re: pH sig figs

Doing sig figs is the same for any other problem you would do with sig figs. Don't worry about it too much.
by Sally kim 4F
Sun Dec 08, 2019 3:22 pm
Forum: Identifying Acidic & Basic Salts
Topic: salt solutions
Replies: 6
Views: 100

Re: salt solutions

You need to know if they will turn out either acidic or basic
by Sally kim 4F
Sun Dec 08, 2019 3:21 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Pi bond order
Replies: 3
Views: 82

Re: Pi bond order

Yeah, just always keep at p first
by Sally kim 4F
Sun Dec 01, 2019 5:43 pm
Forum: Bronsted Acids & Bases
Topic: Strong/Weak Acid/Base
Replies: 2
Views: 23

Strong/Weak Acid/Base

Can someone list the strong/weak acids and bases that we should already know or have memorized?
by Sally kim 4F
Sun Dec 01, 2019 5:36 pm
Forum: Conjugate Acids & Bases
Topic: Acid and Base naming
Replies: 1
Views: 38

Acid and Base naming

Does anyone have any small tips on how to name acids and bases??
by Sally kim 4F
Sun Dec 01, 2019 5:34 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Water
Replies: 5
Views: 45

Re: Water

Water is left out of calculating Ka because it is neutral. Therefore, it doesn't really affect anything in the formula, and doesn't change anything if it's left out
by Sally kim 4F
Sun Dec 01, 2019 5:31 pm
Forum: Conjugate Acids & Bases
Topic: NH3, acid or base?
Replies: 12
Views: 2094

Re: NH3, acid or base?

With the problems using NH3, we consider it as a Bronsted base because typically it is a weak base
by Sally kim 4F
Sun Dec 01, 2019 5:28 pm
Forum: Naming
Topic: How to Know the Charge of Ions
Replies: 7
Views: 77

Re: How to Know the Charge of Ions

The only way that I know those charges quickly is because I memorized the polyatomic ions. There are lots of ways to memorize the ions, do whatever helps you best memorize. I did it by making them into words. So for example, CO3 2-, in my head it would be cow 2. So like the 3 turns into a "w&qu...
by Sally kim 4F
Sun Nov 24, 2019 3:11 pm
Forum: Lewis Acids & Bases
Topic: Strong Acids
Replies: 8
Views: 76

Re: Strong Acids

I think you need to know most, if not, all of the strong acids and how to classify a strong acid.
by Sally kim 4F
Sun Nov 24, 2019 3:09 pm
Forum: Naming
Topic: Final Format
Replies: 6
Views: 51

Re: Final Format

I think that the format will be really similar to the midterm and I think that there will be more questions from the end of the year materials than the earlier topics we did.
by Sally kim 4F
Sun Nov 24, 2019 3:07 pm
Forum: Naming
Topic: Week 9 and Week 10 HW?
Replies: 21
Views: 216

Re: Week 9 and Week 10 HW?

I'm sure that would be perfectly fine, just don't forget to label which is homework 9 and 10!
by Sally kim 4F
Sun Nov 24, 2019 3:04 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating complexes
Replies: 4
Views: 27

Re: Chelating complexes

It's a type of ligand that binds to a metal in a coordination complex. When binding to the metal ion, the chelate forms a ring of atoms.
by Sally kim 4F
Sun Nov 24, 2019 2:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent Shape
Replies: 29
Views: 550

Bent Shape

How many lone pairs can the Bent Shape have?
by Sally kim 4F
Sun Nov 24, 2019 2:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 2
Views: 36

Bond Angles

Can someone list the bond angles for the different molecule shapes that I can refer back to?
by Sally kim 4F
Sun Nov 17, 2019 6:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2F.17
Replies: 2
Views: 38

2F.17

I'm so lost on this problem!
Describe the structure of the formaldehyde molecule, CH 2 O, in terms of hybrid orbitals, bond angles, and s - and p -bonds. The C atom is the central atom to which the other three atoms are attached.
How do you approach this first?
by Sally kim 4F
Sun Nov 17, 2019 6:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2F.7
Replies: 1
Views: 35

2F.7

What did you guys get for this: Identify the hybrid orbitals used by the atom in boldface red type in each of the following species: (a) B F 3 ; (b) As F 3 ; (c) Br F 3 ; (d) Se F 3
by Sally kim 4F
Sun Nov 17, 2019 6:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.29
Replies: 2
Views: 29

2E.29

Can someone help me with this: There are three isomers of dichlorobenzene, C6H4Cl2, which differ in the relative positions of the chlorine atoms on the benzene ring. (a) Which of the three forms are polar? (b) Which has the largest dipole moment?
by Sally kim 4F
Sun Nov 17, 2019 6:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 5
Views: 47

Re: Lone Pairs

square planar, seesaw
by Sally kim 4F
Sun Nov 17, 2019 6:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shapes
Replies: 7
Views: 56

Re: Shapes

Tetrahedral, linear, square planar, octahedral, trigonal bipyramidal, trigonal planar
by Sally kim 4F
Sun Nov 10, 2019 5:14 pm
Forum: Lewis Structures
Topic: Does the shape that I draw the Lewis structure matter?
Replies: 14
Views: 110

Re: Does the shape that I draw the Lewis structure matter?

As of right now, we don’t need to worry about it, but later I think Lavelle will let us know what is okay when dealing with shapes.
by Sally kim 4F
Sun Nov 10, 2019 5:13 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: 2F.3 Help
Replies: 1
Views: 24

2F.3 Help

I don’t understand this question: How many s-bonds and how many p-bonds are there in (a) H2S and (b) SO2? helpp
by Sally kim 4F
Sun Nov 10, 2019 5:05 pm
Forum: Electronegativity
Topic: Iodine
Replies: 6
Views: 60

Iodine

Why is the interaction between I2 the strongest out of Br2, F2, Cl2?
by Sally kim 4F
Sun Nov 10, 2019 3:13 pm
Forum: Student Social/Study Group
Topic: Friday Lecture
Replies: 2
Views: 60

Re: Friday Lecture

I think one key topic was that a shape of a molecule contributes to the strength of interaction. Therefore, the more surface area there is then the more area there is to be induced.
by Sally kim 4F
Sun Nov 10, 2019 3:11 pm
Forum: Bond Lengths & Energies
Topic: Strongest Bond
Replies: 15
Views: 128

Re: Strongest Bond

The strongest to weakest bonds in molecules are covalent, ionic, hydrogen, and then dipole-dipole.
by Sally kim 4F
Sun Nov 03, 2019 3:08 pm
Forum: Electronegativity
Topic: What is isoelectronic?
Replies: 13
Views: 89

Re: What is isoelectronic?

Isoelectronic are two ions that have the same electronic structure and the same number of valence electrons. An example would be F- and Na+.
by Sally kim 4F
Sun Nov 03, 2019 2:50 pm
Forum: General Science Questions
Topic: Finding Formulas from Chemical Name
Replies: 4
Views: 77

Re: Finding Formulas from Chemical Name

I think that if there was a complicated chemical name given, then the molecular formula will be provided for us. But I think we will have to know polyatomic ions on our own. Just try to memorize them if you have some time; there aren't that many so it won't be too hard. Also, I think we'll also have...
by Sally kim 4F
Sun Nov 03, 2019 2:41 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.13
Replies: 2
Views: 36

1E.13

Help pleasee; how would you approach this problem?
Write the ground-state electron configuration for each of the following atoms:
a) silver
b) beryllium
by Sally kim 4F
Sun Nov 03, 2019 2:24 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: paul and hundd rules
Replies: 4
Views: 67

Re: paul and hundd rules

Yes, you should definitely know what the Pauli Exclusion Principle and the Hunds rule is. Also, make sure to study the Aufbau principle as well!!
by Sally kim 4F
Sun Nov 03, 2019 2:16 pm
Forum: Bond Lengths & Energies
Topic: Test?
Replies: 8
Views: 150

Re: Test?

Bond lengths and energies will be on the midterm. Just study up to Focus 2D because the midterm should go up to there.
by Sally kim 4F
Sun Oct 27, 2019 1:14 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: HW Helpp
Replies: 2
Views: 35

HW Helpp

What's the first thing you would do to attempt this problem: What are the principal and orbital angular momentum quantum numbers for each of the following orbitals:
a) 6p
b) 3d
c) 2p
d) 5f
by Sally kim 4F
Sun Oct 27, 2019 1:08 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1F.19: s-block
Replies: 2
Views: 40

1F.19: s-block

Why are s-block metals typically more reactive than p-block metals?
by Sally kim 4F
Sun Oct 27, 2019 1:06 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.9
Replies: 1
Views: 26

1E.9

How do you do this problem: Of the following sets of four quantum numbers {n, l, m(l), m(s)}, identify the ones that are forbidden for an electron in an atom and explain why they are invalid:
a) {4, 2, -1, 1/2}
b) {5, 0, -1, 1/2}
c) {4, 4, -1, 1/2}
by Sally kim 4F
Sun Oct 27, 2019 11:23 am
Forum: Ionic & Covalent Bonds
Topic: Midterm Topics Covered
Replies: 7
Views: 94

Re: Midterm Topics Covered

I'm assuming it will be up to the beginning of chemical bonds, and not much of molecular shape.
by Sally kim 4F
Sun Oct 27, 2019 10:58 am
Forum: Trends in The Periodic Table
Topic: IE, EA, EN, AR Trends
Replies: 4
Views: 31

IE, EA, EN, AR Trends

Can someone summarize the decreasing -> increasing trends on the periodic table of IE, EA, EN, and atomic radius?
by Sally kim 4F
Sun Oct 20, 2019 2:29 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: how to prepare
Replies: 22
Views: 205

Re: how to prepare

Go to the sessions that Lavelle provides, and I would also suggest that you watch YouTube videos on topics that you don't understand. I personally, understand the best through step-by-step videos so hopefully that helps you too!
by Sally kim 4F
Sun Oct 20, 2019 2:09 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Aufbau Principle
Replies: 3
Views: 35

Aufbau Principle

What is the Aufbau Principle and how does it relate to electron configuration?
by Sally kim 4F
Sun Oct 20, 2019 2:05 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Pauli Exclusion Principle
Replies: 9
Views: 491

Pauli Exclusion Principle

Can someone please explain what the Pauli Exclusion Principle is?
by Sally kim 4F
Sun Oct 20, 2019 1:41 pm
Forum: *Black Body Radiation
Topic: Energy of photons
Replies: 4
Views: 163

Re: Energy of photons

The difference between the two is that one measures the energy of a photon, while the other measures kinetic energy, which a mass possesses by being in motion. E=hv is the one that measures the energy of a photon, and E=1/2mv^2 measures the kinetic energy of a mass.
by Sally kim 4F
Sun Oct 20, 2019 1:35 pm
Forum: Properties of Light
Topic: Unit for Wavelength
Replies: 34
Views: 284

Re: Unit for Wavelength

The unit for wavelength is m, since it is just a measurement of distance. Nanometers and picometers are both also alright in terms of using units.
by Sally kim 4F
Sun Oct 13, 2019 8:28 pm
Forum: Properties of Electrons
Topic: electrons
Replies: 3
Views: 33

Re: electrons

How I understand it is that electrons are particles because everything made is made up of particles, and an abundance of those particles would create a sort of wave, electromagnetic wave. This is actually known as the wave=particle duality, where the idea came from famous scientists, such as Einstei...
by Sally kim 4F
Sun Oct 13, 2019 8:15 pm
Forum: Balancing Chemical Reactions
Topic: Writing Out Reactions
Replies: 6
Views: 194

Re: Writing Out Reactions

I think eventually it'll be good to have the polyatomic ions memorized and possibly the trends for ionic charges because I don't think the reactions will always be given to us.
by Sally kim 4F
Sun Oct 13, 2019 8:12 pm
Forum: Properties of Light
Topic: SI units
Replies: 3
Views: 24

Re: SI units

I haven't found one in the textbook or his website, but I usually search it up on the internet: I search up "chart for si units" and it should be the first picture. Hope that helps!
by Sally kim 4F
Sun Oct 13, 2019 8:10 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 4
Views: 49

Re: Photoelectric Effect

The photoelectric effect needs to be carried out in a vacuum because it will prevent less collision between the photo electrons and air molecules, which in turn will prevent energy loss.
by Sally kim 4F
Sun Oct 13, 2019 7:51 pm
Forum: Properties of Electrons
Topic: Stefan–Boltzmann law meaning and relevance
Replies: 1
Views: 7

Re: Stefan–Boltzmann law meaning and relevance

According to Britannica, Stefan-Boltzmann law is a "statement that the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature." The way that I understand it is that all objects lose or gain energy through electromagnetic radiation.
by Sally kim 4F
Wed Oct 02, 2019 11:12 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Units in Answer
Replies: 18
Views: 283

Re: Units in Answer

Sometimes it will be in grams, sometimes it will be in moles. It varies depending on what the question is asking. It should be pretty clear in the problem what they are specifically looking for, so don't worry too much!
by Sally kim 4F
Wed Oct 02, 2019 11:09 pm
Forum: SI Units, Unit Conversions
Topic: SI units for exam
Replies: 6
Views: 84

Re: SI units for exam

Definitely use sig figs. When you do use sig figs on his tests, make sure to only apply it on the final answer instead of the values obtained throughout the problem.
by Sally kim 4F
Wed Oct 02, 2019 11:06 pm
Forum: Empirical & Molecular Formulas
Topic: Writing Molecular Formulas with charges [ENDORSED]
Replies: 4
Views: 112

Re: Writing Molecular Formulas with charges [ENDORSED]

When writing formulas, the charge is essential because it tells you how much you need of each element. I would suggest searching up the "trend for ionic charge" to easily determine the charge of an element.
by Sally kim 4F
Wed Oct 02, 2019 10:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Tips for Tests [ENDORSED]
Replies: 4
Views: 95

Re: Tips for Tests [ENDORSED]

Definitely watch the modules again and continue to take notes on both the book and the videos he gives. You can also keep doing the fundamental problems listed, because there is a good chance he may use one of those questions.
by Sally kim 4F
Wed Oct 02, 2019 10:48 pm
Forum: Molarity, Solutions, Dilutions
Topic: Empirical and Molecular Formulas
Replies: 13
Views: 208

Re: Empirical and Molecular Formulas

Referring to Lavelle's first module, the empirical formula shows the relative number of atoms that a molecule has, and the molecular formula shows the actual number of atoms. By this, we can understand that the empirical formula is the simplest ratio of the elements. Therefore, if the formula given ...
by Sally kim 4F
Wed Oct 02, 2019 10:09 pm
Forum: Significant Figures
Topic: When to apply sig figs?
Replies: 4
Views: 74

Re: When to apply sig figs?

Hii!! I used to be confused about this also, but here's what I think. When you use sig figs, I believe that you only apply it to the final answer because if you keep applying it to every value you get, the final answer may not be as accurate.

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