Search found 69 matches

by Brian J Cheng 1I
Sun Jan 19, 2020 10:09 pm
Forum: Ideal Gases
Topic: homework #3
Replies: 8
Views: 22

Re: homework #3

Technically you're allowed to use problems from any material that is going to be on the exam, but like others have said it's better to remain on top of the lecture material as homework problems.
by Brian J Cheng 1I
Sun Jan 19, 2020 9:11 pm
Forum: General Science Questions
Topic: test 1
Replies: 6
Views: 13

Re: test 1

Test is during your discussion period this week, so it will occur at different times for every discussion section.
by Brian J Cheng 1I
Sun Jan 19, 2020 9:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5% rule
Replies: 8
Views: 23

Re: 5% rule

If the equilibrium concentration divided by the initial reactant concentration is less than 0.05, then the equilibrium constant is valid. Basically this means: the change in concentration of product can be ignored while solving the equilibrium constant equation as long as it is less than 5% of the i...
by Brian J Cheng 1I
Sun Jan 19, 2020 9:02 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: X was ignored
Replies: 19
Views: 34

Re: X was ignored

X value was ignored because the K value was so small, meaning the amount of product formed compared to the reactants was very small. This means that the amount of products (x) can technically be ignored as a change factor which is why you can eliminate it.
by Brian J Cheng 1I
Fri Jan 17, 2020 11:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Tips for Test
Replies: 16
Views: 48

Re: Tips for Test

I study by doing homework problems and reading the textbook. Just make sure you're well adapted to the situations that might arise and you will be fine.
by Brian J Cheng 1I
Thu Jan 09, 2020 11:39 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Effect of Inert Gases
Replies: 9
Views: 27

Re: Effect of Inert Gases

As stated already, inert gases are exempt as they are stable and seldom interact with species involved in reactions. You can think of them as "pure" substances like liquids and solids which are also exempt from the equilibrium constant.
by Brian J Cheng 1I
Thu Jan 09, 2020 11:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Meaning of equilibrium constant
Replies: 5
Views: 30

Re: Meaning of equilibrium constant

When K is in the intermediate region, neither forward nor reverse reactions are favored. You can say the rxn is in an "intermediate" stage
by Brian J Cheng 1I
Thu Jan 09, 2020 11:34 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K and Q Values
Replies: 5
Views: 22

Re: K and Q Values

Recap: Q can be thought as the products-to-reactants constant at any time of the reaction. If Q < K, this means that the [products]/[reactants] ration at this time is smaller than the ratio at equilibrium; i.e. the [reactants] at this time are greater. Thus, the forward reaction will be favored as t...
by Brian J Cheng 1I
Thu Jan 09, 2020 11:30 pm
Forum: Student Social/Study Group
Topic: Chemistry Community Confessions
Replies: 2
Views: 39

Chemistry Community Confessions

I just had a random thought: since it's Week 1 and we've barely started, how about we set up an anonymous Chemistry confessions forum like the UCLA/UC Berkeley Facebook Confessions pages? Personally I think it would be a fun way to get to know each other more. Thoughts on this?
by Brian J Cheng 1I
Wed Jan 08, 2020 5:49 pm
Forum: Student Social/Study Group
Topic: Discussion Sections
Replies: 7
Views: 51

Discussion Sections

Just got an email about discussion sections and thought I would confirm with you guys.

Are there going to be discussion sections this week for Chem 14B?
by Brian J Cheng 1I
Sat Dec 07, 2019 8:48 pm
Forum: Amphoteric Compounds
Topic: Amphoteric vs amphiprotic
Replies: 4
Views: 28

Re: Amphoteric vs amphiprotic

Amphoteric means the compound can act as an acid or base, whereas amphiprotic means that the compound can donate and accept protons.

Building on to this, amphiprotic compounds are always amphoteric by definition.
by Brian J Cheng 1I
Sat Dec 07, 2019 8:47 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Ka. Kb, Kw
Replies: 4
Views: 35

Re: Ka. Kb, Kw

What is the difference between Ka, Kb, and Kw? Also, what is the difference between Ka1 and Ka2? Do we need to calculate Ka and Kb in the final? Ka * Kb = Kw = 1.0 x 10^-14 pKa + pKb = pKw = 14 Ka1 and Ka2 only appear in polyprotic acids (i.e. H2so4). Ka1 is the dissociation constant when 0 H+ are l...
by Brian J Cheng 1I
Sat Dec 07, 2019 8:43 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pKA values
Replies: 4
Views: 38

Re: pKA values

pKa is the negative log of the Ka value. Right now it's used in comparing acid strength as many have stated above.
by Brian J Cheng 1I
Sat Dec 07, 2019 8:43 pm
Forum: Lewis Acids & Bases
Topic: Bronsted vs Lewis Acid
Replies: 1
Views: 24

Re: Bronsted vs Lewis Acid

Acids are by definition both Bronsted and Lewis. The two different "types" are just different ways of looking at acid function. Acids traditionally combine with water molecules and result in the loss of an H+ proton, which binds to water to form the acidic H3O+ hydronium ion. However, this...
by Brian J Cheng 1I
Sat Dec 07, 2019 8:40 pm
Forum: Biological Examples
Topic: Vitamin B12
Replies: 2
Views: 48

Re: Vitamin B12

Vitamin B12 has a center of Cobalt with 5 Nitrogen ligands and one CH2. It has an overall octahedral shape centered at Cobalt. According to the book, the cobalt prevents pernicious anemia and mental illnesses, and classmates have said it also participates in synthesis of DNA and myelin, metabolism o...
by Brian J Cheng 1I
Sat Dec 07, 2019 8:37 pm
Forum: Naming
Topic: Abbreviations
Replies: 6
Views: 41

Re: Abbreviations

Yes, we're allowed to use abbreviations (Lyndon and many TAs have confirmed this). en, edta, and ox (for oxalato) are all allowed.
by Brian J Cheng 1I
Sat Dec 07, 2019 8:36 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: H20
Replies: 4
Views: 21

Re: H20

Think of polydentate molecules having two different bonding sites on two different atoms. As mentioned above, "spacer" atoms are need to give the atoms adequate space to bind more than once. The two electron LP's on the oxygen of H2O do not provide enough space to form two bonds to a centr...
by Brian J Cheng 1I
Sun Dec 01, 2019 3:34 pm
Forum: Industrial Examples
Topic: What do we need to know?
Replies: 15
Views: 124

Re: What do we need to know?

I would review all the biological examples Dr. Lavelle has reviewed in class. As seen by Test 2, he might pull up something from his lectures that we considered to be unimportant or just another example.
by Brian J Cheng 1I
Sun Dec 01, 2019 3:33 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: hw problem
Replies: 1
Views: 16

Re: hw problem

Coordination numbers are basically the amount of bonding sites the central atom has. Take into account some ligands are polydentate and bind at more than one place. Can't give you the exact methods to solve this problem as I don't have my materials with me at the moment, but hope my reply helped.
by Brian J Cheng 1I
Sun Dec 01, 2019 3:30 pm
Forum: Student Social/Study Group
Topic: Final Topics
Replies: 4
Views: 33

Re: Final Topics

I would just focus on the topics we've been taught in class. I don't think we've learned about the specifics behind molecular and atomic spectroscopy. We've learned that mass spectroscopy, however, gives you the exact masses of molecular compounds to help in making molecular formulas.
by Brian J Cheng 1I
Sun Dec 01, 2019 3:26 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Water
Replies: 5
Views: 29

Re: Water

I believe Ka only focuses on the formation of acids (i.e. HCl -> Cl- + H+) so thus water won't really apply here.
by Brian J Cheng 1I
Sun Dec 01, 2019 3:23 pm
Forum: Naming
Topic: Roman Numeral
Replies: 13
Views: 65

Re: Roman Numeral

As many have said above, it represents the (usually positive) charge of the atom it's coupled with. Usually only transition metals have this notation.
by Brian J Cheng 1I
Sun Dec 01, 2019 3:22 pm
Forum: Naming
Topic: Final Exam?
Replies: 20
Views: 127

Re: Final Exam?

Thanks for the info! I would brush up on everything you can't remember off the top of your head and reinforce those topics via hw questions.
by Brian J Cheng 1I
Sun Dec 01, 2019 3:21 pm
Forum: Student Social/Study Group
Topic: Final topics
Replies: 10
Views: 57

Final topics

Quick question: does the final cover all topics throughout the entire school year? Or does it only cover material taught after the midterm?
by Brian J Cheng 1I
Sat Nov 23, 2019 11:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T-shaped v. Trigonal pyramid
Replies: 9
Views: 58

Re: T-shaped v. Trigonal pyramid

I second the use of a visual aid to determine molecular shape. Sometimes I find it's helpful to visualize a molecule as if each electron density corresponds to a X value in the "AXE" VSEPR notation, then removing X's based on the number of lone pairs there are until the true molecular shap...
by Brian J Cheng 1I
Sat Nov 23, 2019 11:19 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acids
Replies: 13
Views: 85

Re: Acids

Dr. Lavelle will most likely give us an idea on which specific acids we should know but the most common acids (shown above) are a good place to start!
by Brian J Cheng 1I
Sat Nov 23, 2019 11:18 pm
Forum: Biological Examples
Topic: Biological Importance
Replies: 6
Views: 23

Re: Biological Importance

I second the statement above about the effect of pH on protein functionality. I would assume everything in the lectures that Dr. Lavelle goes into detail about is fair game.
by Brian J Cheng 1I
Sat Nov 23, 2019 11:15 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 95
Views: 19707

Re: Final Jitters

Get a good night's sleep. Always helps to give your mind some proper rest
by Brian J Cheng 1I
Sat Nov 23, 2019 11:14 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: ligand
Replies: 3
Views: 19

Re: ligand

Ligands are basically "anything" that attaches to a metal atom to form a coordination compound. Ligands can be neutral in charge or negatively charged.
by Brian J Cheng 1I
Sat Nov 23, 2019 11:13 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Diethelyne tri-amine
Replies: 1
Views: 15

Re: Diethelyne tri-amine

Think of this as a more convenient shorthand configuration. The bonding of the Hydrogens on either side of the Carbon is there at the molecular level but it's written as CH2 instead of H-C-H etc to save time and space.
by Brian J Cheng 1I
Sun Nov 17, 2019 5:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Preferential
Replies: 3
Views: 31

Re: Preferential

Molecular shape is based on the arrangement of atoms and areas of electron density. Higher or lower Ionization Energies or Electronegativities of atoms will not affect structure.
by Brian J Cheng 1I
Sun Nov 17, 2019 5:31 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 7
Views: 45

Re: Polarity

It's a symmetric molecule and has even distributions of electron density; thus, it is nonpolar.
by Brian J Cheng 1I
Sun Nov 17, 2019 5:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Do we have to memorize the names of shapes and/or the bond angles?
Replies: 7
Views: 40

Re: Do we have to memorize the names of shapes and/or the bond angles?

Yes, we need to memorize the names of the molecular shapes and the rough bond angles. I.e. trigonal planar = shape. 120 degrees = bond angle. OR i.e. trigonal pyramidal = shape, < 109.5 degrees = angle.
by Brian J Cheng 1I
Sun Nov 17, 2019 5:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.13
Replies: 1
Views: 15

Re: 2E.13

I would try to visualize this in 3 dimensions. If there were no lone pairs, the molecule would have a trigonal bipyramidal shape with 180 degree bond angle through the axis and 120 degrees equatorial. But because there are 3 lone pairs, you remove the three equatorial atoms, causing enough repulsion...
by Brian J Cheng 1I
Sun Nov 17, 2019 5:20 pm
Forum: Student Social/Study Group
Topic: test 2
Replies: 8
Views: 47

Re: test 2

50
by Brian J Cheng 1I
Sun Nov 17, 2019 5:19 pm
Forum: SI Units, Unit Conversions
Topic: Memorizing Conversions
Replies: 23
Views: 219

Re: Memorizing Conversions

It's great to memorize the general conversion factors. pm (picometers, 10^-12) and nm (nanometers, 10^-9) are given but it's great to have a handle on the other prefixes in case they pop up in questions.
by Brian J Cheng 1I
Mon Nov 11, 2019 2:52 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7750
Views: 1063031

Re: Post All Chemistry Jokes Here

An excited electron in this sense may be deadly
by Brian J Cheng 1I
Sun Nov 03, 2019 10:43 pm
Forum: Formal Charge and Oxidation Numbers
Topic: How to know where a double bond should go?
Replies: 10
Views: 71

Re: How to know where a double bond should go?

Check the atoms' octets as well as the formal charge. More electronegative atoms would prefer negative formal charges and thus form more stable structures if this is accomplished via bond rearrangement.
by Brian J Cheng 1I
Sun Nov 03, 2019 10:30 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configuration for D block
Replies: 3
Views: 26

Re: Electron configuration for D block

Venus is correct. But in any case, the 4s orbitals fill first before the 3d orbitals. In copper and chromium, the pre-existing electron from 4s2 fills up a spot in the lower energy 3d5 and 3d10 orbitals, resulting in 4s1 configuration.
by Brian J Cheng 1I
Sun Nov 03, 2019 10:27 pm
Forum: Quantum Numbers and The H-Atom
Topic: Ms and ML
Replies: 6
Views: 43

Re: Ms and ML

Not really sure why ms has -1/2 and +1/2 specifically but the positive and negative values are there to represent opposite electron spins.
by Brian J Cheng 1I
Sun Nov 03, 2019 10:25 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configuration for D block
Replies: 3
Views: 26

Re: Electron configuration for D block

The empty 3d block is higher in energy than the 4s block. Because electrons fill up lower energy shells first, the 4s fills before the 3d orbitals. But once one electron is present in the 3d orbitals, it drops to a lower energy than the 4s. This is why an atom with filled 4s and 3d orbitals has 4s e...
by Brian J Cheng 1I
Sun Nov 03, 2019 10:21 pm
Forum: Octet Exceptions
Topic: Expanded Valence Shells
Replies: 6
Views: 31

Re: Expanded Valence Shells

Theoretically speaking, all atoms in the 3rd energy level can break the octet rule because of their unused 3d orbitals that can accommodate extra electrons; however, in nature, only a few atoms consistently do this.
by Brian J Cheng 1I
Sun Nov 03, 2019 10:18 pm
Forum: Electronegativity
Topic: definitions
Replies: 8
Views: 60

Re: definitions

We will not need to know how to calculate the exact values in ionization energy or electronegativity; however, we will need to know what they mean and their respective periodic trends. We'll also need to know how they apply to bonding (i.e. the atom with the highest electronegativity prefers a negat...
by Brian J Cheng 1I
Sun Nov 03, 2019 10:16 pm
Forum: Quantum Numbers and The H-Atom
Topic: Formal names for each letter
Replies: 5
Views: 61

Re: Formal names for each letter

n = principal number
l = orbital angular momentum number
ml = magnetic number

I would just try and hard-code it into my mind. I don't think the full names of the quantum numbers matter very much though--I'm sure the graders will know what you mean if you just use n, l, ml, and ms.
by Brian J Cheng 1I
Sun Oct 27, 2019 5:21 pm
Forum: Trends in The Periodic Table
Topic: Ionization and Electron Affinity
Replies: 5
Views: 28

Re: Ionization and Electron Affinity

Adding on to the posts above, I find it helpful to remember the two separately by thinking of Electron Affinity (energy released when an element gains an electron) as the "affinity" or "attraction" that an elements have for an electron. This increases across a row and decreases d...
by Brian J Cheng 1I
Sun Oct 27, 2019 5:17 pm
Forum: Resonance Structures
Topic: Expanded Octets
Replies: 4
Views: 31

Re: Expanded Octets

Expanded octets (otherwise known as exceptions to the octet rule) exist starting with elements with 4s and 3d orbitals. Due to the nature and arrangement of orbitals, the 4s orbitals fill up before the 3d ones do. This allows additional electrons to be added into the empty 3d orbitals, allowing thes...
by Brian J Cheng 1I
Sun Oct 27, 2019 5:13 pm
Forum: Student Social/Study Group
Topic: Miderm Review
Replies: 10
Views: 112

Re: Miderm Review

I personally have not tried Sapling for myself yet, but I've heard some students are disappointed with what it offers. It's apparently just the same information you can find from the textbook and Dr. Lavelle's webpage. Still open to anything though! I'll give it a look and update my post if I find a...
by Brian J Cheng 1I
Sun Oct 27, 2019 5:11 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Determining # for Formal Charge
Replies: 2
Views: 23

Re: Determining # for Formal Charge

Formal Charge for an element in a compound/molecule is calculated with this formula: FC = # of Valence electrons - (# of lone pair electrons + (#of shared electrons / 2) ) = V - (L + S/2). The S value refers to the # of shared electrons; i.e. the amount of electrons present in bonds. Remember that s...
by Brian J Cheng 1I
Sun Oct 27, 2019 5:03 pm
Forum: Student Social/Study Group
Topic: Study Tips
Replies: 58
Views: 725

Re: Study Tips

I would personally focus on exposing myself to as many problems as possible to get used to applying the information we've learned in lectures in multitudes of ways. External resources (Professor Lavelle's webpage, Youtube, Khanacademy) can help clarify information, but the true essence of understand...
by Brian J Cheng 1I
Sun Oct 27, 2019 4:56 pm
Forum: Resonance Structures
Topic: Bond lenghts.
Replies: 11
Views: 63

Re: Bond lenghts.

We haven't been taught how exactly to obtain measurements for bond lengths as of now. Professor Lavelle specified the different lengths to prove that double and triple bonds have higher attraction and thus shorter lengths than single bonds, and the bonds for resonance structures have lengths between...
by Brian J Cheng 1I
Sun Oct 27, 2019 4:52 pm
Forum: Ionic & Covalent Bonds
Topic: Valence Electrons
Replies: 16
Views: 110

Re: Valence Electrons

Valence electrons of a specific element are based on the position the element is inside its period (row). For example, Oxygen is the 6th element in its period (not counting elements in d and f blocks), which means it has 6 valence electrons. Chlorine is the 7th element in its period so it has 7 vale...
by Brian J Cheng 1I
Sat Oct 19, 2019 11:23 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1D.17
Replies: 1
Views: 15

Re: 1D.17

Question: 1D.15: What are the principal and orbital angular momentum quantum numbers for each of the following orbitals:(a)6p,(b)3d,(c)2p,(d)5f?

principal # n = energy level
Angular momentum # l = 0,1,2,3,.... n-1

a) 6p: n = 6, l = 1
b) 3d: n = 3, l = 2
c) 2p: n = 2, l = 1
d) 5f: n = 5, l = 3
by Brian J Cheng 1I
Sat Oct 19, 2019 11:18 pm
Forum: Quantum Numbers and The H-Atom
Topic: 1D.19
Replies: 6
Views: 43

Re: 1D.19

Below always holds true:
s: 1 orbital
p: 3 orbitals
d: 5 orbitals
f: 7 orbitals
g: 9 orbitals
by Brian J Cheng 1I
Sat Oct 19, 2019 11:16 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Unit for Avogadro's Number
Replies: 10
Views: 123

Re: Unit for Avogadro's Number

Avogadro's number is used to convert mols to virtually any unit. Think of it as the number of "something" in one mole of this "something". It can be the amount of atoms in 1 mole of atoms, or even the amount of jelly beans in one mole of jelly beans.
by Brian J Cheng 1I
Sat Oct 19, 2019 11:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Inner e- and Outer e-
Replies: 14
Views: 83

Re: Inner e- and Outer e-

Just another reimagining of the same story: The different positions of the electrons cause electrons closer to the nucleus to "shield" outer electrons from the nucleus' attractive forces. This affects the energy needed to use electrons in bonding or to remove electrons entirely. For atoms ...
by Brian J Cheng 1I
Sat Oct 19, 2019 11:06 pm
Forum: Properties of Light
Topic: Homework due Next Week
Replies: 9
Views: 78

Re: Homework due Next Week

Yes, this should be the correct homework.
by Brian J Cheng 1I
Sat Oct 19, 2019 11:05 pm
Forum: General Science Questions
Topic: Tests
Replies: 9
Views: 72

Re: Tests

It would be great to memorize them! There are a few that are used extensively in life-science applications, and it would be wonderful in my opinion to streamline our calculations by committing some of these prefixes to memory.
by Brian J Cheng 1I
Sat Oct 19, 2019 10:54 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7750
Views: 1063031

Re: Post All Chemistry Jokes Here

Here's a good one:

What is the chemical formula of coffee?

CoFe2
by Brian J Cheng 1I
Sat Oct 12, 2019 10:05 pm
Forum: Properties of Light
Topic: Speed of Light
Replies: 41
Views: 899

Re: Speed of Light

For the purpose of this class we'll assume the speed of light (c) to be roughly 3.00 x 10^8 m/s. Light travels at different speeds through different mediums, but we'll use the vacuum measurement for our calculations
by Brian J Cheng 1I
Sat Oct 12, 2019 6:51 pm
Forum: Properties of Light
Topic: Balmer vs Lyman series
Replies: 4
Views: 53

Re: Balmer vs Lyman series

The respective series form because the electron absorption "pathways" all have the lowest energy level (n) involved. For the Lyman series n=1, and the Balmer series has electrons starting from n=2.
by Brian J Cheng 1I
Sat Oct 12, 2019 6:44 pm
Forum: SI Units, Unit Conversions
Topic: Weekly Posts
Replies: 7
Views: 64

Re: Weekly Posts

Before Sunday would be best.
by Brian J Cheng 1I
Fri Oct 11, 2019 11:55 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 5
Views: 72

Re: Sig Figs

If you wanted to be really precise, I would suggest not rounding until the very end. However, I've found that rounding from time-to-time within the calculations don't make that much of a difference, so make of it what you will.
by Brian J Cheng 1I
Sun Oct 06, 2019 10:52 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7750
Views: 1063031

Re: Post All Chemistry Jokes Here

Friend: What's H2O?

Me: Water.

Friend: Ok, what's 100000000000000000000000000000000000H2O?

Me: IDK, a flood??
by Brian J Cheng 1I
Sat Oct 05, 2019 10:55 am
Forum: Properties of Light
Topic: "n" variable
Replies: 3
Views: 37

Re: "n" variable

"n" refers to the energy level of a particular electron. Because energy is "quantized" at the quantum level, electrons can only exist in specific energy values, hence "n" being limited to 1, 2, 3, etc etc.
by Brian J Cheng 1I
Sat Oct 05, 2019 10:53 am
Forum: Student Social/Study Group
Topic: Study Group Fall 2019
Replies: 32
Views: 1398

Re: Study Group Fall 2019

Yes please! Thank you so much for this! I'm fully onboard with this idea.
by Brian J Cheng 1I
Fri Oct 04, 2019 9:18 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Units
Replies: 4
Views: 62

Re: Formula Units

A google search told me that "formula units" is equal to the number of molecules of that specific compound present. I would use the same method as finding the amount of atoms (1 mol == 6.022 x 10^23 atoms or formula units). Please correct me if I'm wrong, thanks!
by Brian J Cheng 1I
Fri Oct 04, 2019 9:15 am
Forum: SI Units, Unit Conversions
Topic: Homework
Replies: 9
Views: 146

Re: Homework

I wrote mine in pencil; I might catch calculation errors in my work, so erasing my writing from time to time is always welcome :)
by Brian J Cheng 1I
Fri Oct 04, 2019 9:13 am
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 168
Views: 102469

Re: Rusty on High School Chem [ENDORSED]

Same here! I haven't taken Chemistry in a few years, but Lavelle's modules and Fundamentals reviews really help out in making the information come back to me! I suppose if we read ahead periodically and used his office hours/external resources, we would all do well :) Good luck to all of us!
by Brian J Cheng 1I
Sun Sep 29, 2019 9:24 am
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 130
Views: 2914

Re: Advice from a Medical Student - Part II [ENDORSED]

Thank you for sharing your experiences--it was amazing to hear about what to expect from med school and beyond! Highly looking forward to Dr. Lavelle's classes! Did you have your mind set on a medical occupation from the start, or would there be an alternate universe where you would pursue something...

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