Search found 57 matches

by CalvinTNguyen2D
Sun Jan 12, 2020 8:25 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q and K
Replies: 6
Views: 21

Re: Q and K

K is a constant that is calculated during equilibrium, but Q is the reactant quotient that is not calculated during equilibrium. Q is a good indicator of which way a reactant will be favored; if its less than K, then the reaction is favored forwards, and vice-versa.
by CalvinTNguyen2D
Sun Jan 12, 2020 8:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Units for K
Replies: 21
Views: 51

Re: Units for K

K does not have any units associated with it, since it's just a ratio of different molecules and species.
by CalvinTNguyen2D
Sun Jan 12, 2020 8:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K and Q
Replies: 10
Views: 23

Re: K and Q

K is calculated when the reaction is at equilibrium, but Q is not. Q is a great indicator to figure out which way the reaction is favored.
by CalvinTNguyen2D
Sun Jan 12, 2020 8:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp
Replies: 6
Views: 20

Re: Kp

Kp is only used for gases, while Kc is used for concentrations. If needed, you can convert individual species from concentration to atm through PV=nRT
by CalvinTNguyen2D
Sun Jan 12, 2020 8:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Studying tips
Replies: 10
Views: 21

Re: Studying tips

Hey! Here's some things that worked for me last quarter; Doing every single hw problem on the syllabus. They're all fantastic review of concepts and things that will be on the test, and some problems will be the exact same on these tests, midterms, and finals. Visiting chem community and browsing th...
by CalvinTNguyen2D
Mon Dec 02, 2019 5:34 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 9C.9
Replies: 1
Views: 24

Re: 9C.9

It’s best to use the table they have in the textbook! For c, each Cl has one bonding site, so that would be 2. Each (en) has two bonding sites, and since there are 2, there would be 4 (en) bonding sites in total. All in all, that would be 6! For d, (edta) has a total of sic potential bonding sites, ...
by CalvinTNguyen2D
Mon Dec 02, 2019 8:18 am
Forum: Administrative Questions and Class Announcements
Topic: Calculators on Final
Replies: 6
Views: 33

Re: Calculators on Final

I’m pretty certain we’ll need calculators, since it’ll be based on some topics we covered on the midterm as well.
by CalvinTNguyen2D
Mon Dec 02, 2019 8:16 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Lecture
Replies: 3
Views: 32

Re: Lecture

The more stable an acid’s structure is, the stronger it usually is because of how it will run to full completion rather than the reaction being partially completed. The more electronegative atoms attached or the more resonance structures, the more stable these acids are.
by CalvinTNguyen2D
Mon Dec 02, 2019 8:12 am
Forum: Industrial Examples
Topic: What do we need to know?
Replies: 15
Views: 123

Re: What do we need to know?

I think it’d be good to review the general structure and the different things he notes about it; for hemoglobin I remember Prof. Lavelle talked quite a bit about oxygen and iron within hemoglobin.
by CalvinTNguyen2D
Mon Dec 02, 2019 8:08 am
Forum: Naming
Topic: oxidation
Replies: 8
Views: 39

Re: oxidation

For transition metals, the oxidation number is an important part of the naming process with a Roman numeral indicating the oxidation state being placed after the transition metal.
by CalvinTNguyen2D
Mon Dec 02, 2019 8:07 am
Forum: Naming
Topic: Order of Ligands
Replies: 4
Views: 28

Re: Order of Ligands

Ligands should be named in alphabetical order, but ignore the prefixes when you’re arranging them!
by CalvinTNguyen2D
Mon Dec 02, 2019 8:05 am
Forum: Biological Examples
Topic: How Cisplatin Works?
Replies: 2
Views: 33

Re: How Cisplatin Works?

Cisplatin’s ligands are able to bind to the nucleotides of DNA on two sites, while transplatin can only do so on one site.
by CalvinTNguyen2D
Mon Dec 02, 2019 8:02 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 6
Views: 54

Re: Test 2

I already had my test handed back, so you should get it by your discussion date or it’ll be posted online!
by CalvinTNguyen2D
Mon Dec 02, 2019 7:59 am
Forum: Hybridization
Topic: 2F.5
Replies: 4
Views: 24

Re: 2F.5

Hybridization cam be found relatively straightforward by drawing out the lewis structures for each molecule!
by CalvinTNguyen2D
Mon Dec 02, 2019 7:57 am
Forum: SI Units, Unit Conversions
Topic: midterm/final
Replies: 18
Views: 237

Re: midterm/final

It’ll more than likely be a mix of the two, with an emphasis on calculations and some conceptual understanding as well.
by CalvinTNguyen2D
Mon Dec 02, 2019 7:46 am
Forum: Administrative Questions and Class Announcements
Topic: Curving in Chem 14A
Replies: 7
Views: 147

Re: Curving in Chem 14A

There is a chance for a slight curve, but it’s not large enough for us to bank on it.
by CalvinTNguyen2D
Sun Nov 17, 2019 6:05 pm
Forum: Lewis Structures
Topic: Exceptions
Replies: 5
Views: 31

Re: Exceptions

Elements that are in the third period and lower are able to draw upon their other subshells and thus can break the octet "rule". There are also other elements that break it by not fully filling their shells to 8 as well!
by CalvinTNguyen2D
Sun Nov 17, 2019 6:00 pm
Forum: DeBroglie Equation
Topic: When to Use
Replies: 8
Views: 48

Re: When to Use

This equation is only to find the wavelength for objects with mass, velocity, and thus momentum! It will NOT work for electromagnetic radiation, so be sure to not confuse it with c = (frequency)(wavelength).
by CalvinTNguyen2D
Sun Nov 17, 2019 5:58 pm
Forum: SI Units, Unit Conversions
Topic: Memorizing Conversions
Replies: 23
Views: 218

Re: Memorizing Conversions

I've found it really useful to know micro, nano, pico, Angstroms, kilo, milli, and centi off the top of my head, but the exam provides the conversions if you forget as well!
by CalvinTNguyen2D
Sun Nov 17, 2019 5:57 pm
Forum: Trends in The Periodic Table
Topic: Question
Replies: 17
Views: 130

Re: Question

They're somewhat related, but they're not the same!
Ionization energy is the amount of energy required to remove an electron from the atom, while electronegativity is how much an atom attracts electrons towards it!
by CalvinTNguyen2D
Sun Nov 17, 2019 5:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 5
Views: 29

Re: VSEPR

There's no set formula for VSEPR, but the general format for for the structures is AXnEn (A is the central atom, X is any atom around the central atom, and E is the electron lone pairs surrounding the electron).
by CalvinTNguyen2D
Sun Nov 10, 2019 11:44 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum numbers
Replies: 12
Views: 96

Re: Quantum numbers

The angular momentum is l, n is the principle quantum number, m(l) is the magnetic quantum number, and m(s) is the electron spin number.
by CalvinTNguyen2D
Sun Nov 10, 2019 11:40 pm
Forum: DeBroglie Equation
Topic: De Broglie Equation Derivation and Use
Replies: 7
Views: 44

Re: De Broglie Equation Derivation and Use

De Broglie's equation can be used for any particle or object with a mass and velocity (momentum)!
by CalvinTNguyen2D
Sun Nov 10, 2019 11:39 pm
Forum: Properties of Light
Topic: How to find the longest wavelength?
Replies: 6
Views: 49

Re: How to find the longest wavelength?

The longest wavelength correlates with the same amount of energy of the work function. Just set Ep and the Work Function equal to one another and solve for the wavelength!
by CalvinTNguyen2D
Sun Nov 10, 2019 11:29 pm
Forum: Trends in The Periodic Table
Topic: Electronegativity
Replies: 9
Views: 51

Re: Electronegativity

Electronegativity will increase moving up the periodic table, and also increase going from left to right each period!
by CalvinTNguyen2D
Sun Nov 10, 2019 11:28 pm
Forum: Trends in The Periodic Table
Topic: Atomic Radius
Replies: 9
Views: 55

Re: Atomic Radius

Atomic radius will increase as you go down the periodic table, and will also increase as you move from right to left each period!
by CalvinTNguyen2D
Sun Nov 03, 2019 11:24 pm
Forum: Quantum Numbers and The H-Atom
Topic: magnetic quantum number
Replies: 5
Views: 23

Re: magnetic quantum number

The magnetic quantum number describes the specific orbital within the shell and the shell shape. It correlates with the orbital quantum number, ranging from -l to +l. This image might be useful to help visualise what's being described by the number. I hope this helps! https://upload.wikimedia.org/wi...
by CalvinTNguyen2D
Sun Nov 03, 2019 11:17 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Aufbau vs Hunds
Replies: 6
Views: 39

Re: Aufbau vs Hunds

The Aufbau principle is that electrons need to first occupy the lower energy levels before filling higher energy ones- it literally means "build-up" in German! Hund's rule says that the orbitals need to have one electron first before they can be paired up with another electron.
by CalvinTNguyen2D
Sun Nov 03, 2019 11:14 pm
Forum: Trends in The Periodic Table
Topic: Dino Nugget Mini review
Replies: 3
Views: 64

Re: Dino Nugget Mini review

Polarizing power is related to the charge over the size of the ion; Lithium would have the most polarizing power, as it as the smallest radius out of all the cations listed.
by CalvinTNguyen2D
Sun Nov 03, 2019 11:06 pm
Forum: Properties of Light
Topic: De Broglie
Replies: 3
Views: 46

Re: De Broglie

Electrons will have a faster velocity than the protons. Because the wavelengths are the same, and electrons are significantly smaller than protons, the electrons' velocity will be faster than the protons'.
by CalvinTNguyen2D
Sun Nov 03, 2019 11:03 pm
Forum: Properties of Light
Topic: What are the units of hertz
Replies: 41
Views: 233

Re: What are the units of hertz

s^-1, or one cycle per second!
by CalvinTNguyen2D
Sun Oct 27, 2019 11:52 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Octet Rules
Replies: 8
Views: 44

Re: Octet Rules

Just to add on, other elements like sulfur, silicon, and chlorine can have expanded octets!
by CalvinTNguyen2D
Sun Oct 27, 2019 11:49 pm
Forum: SI Units, Unit Conversions
Topic: Calculate using kg or g?
Replies: 13
Views: 183

Re: Calculate using kg or g?

It'll depend mostly on the equation that you need to use, but generally we use grams for molar conversions and kilograms for calculations involving spectrography.
by CalvinTNguyen2D
Sun Oct 27, 2019 11:47 pm
Forum: Significant Figures
Topic: Sig Figs on Tests
Replies: 24
Views: 265

Re: Sig Figs on Tests

Your answer should have the same amount of sig figs as the lowest sig fig number given in the problem!
by CalvinTNguyen2D
Sun Oct 27, 2019 11:46 pm
Forum: Significant Figures
Topic: How many significant figures are in 7.00 x 10^2?
Replies: 12
Views: 147

Re: How many significant figures are in 7.00 x 10^2?

There'd be only 3 sig figs! We don't consider the power in the scientific notion, only the 7.00. Going by that, there would be 3, one before the decimal, and one after.
by CalvinTNguyen2D
Sun Oct 27, 2019 11:45 pm
Forum: SI Units, Unit Conversions
Topic: Midterm
Replies: 6
Views: 71

Re: Midterm

Yes, the midterm is going to cover everything we've learned up to now. It'd be good to go over all of our homework to review for it!
by CalvinTNguyen2D
Sun Oct 20, 2019 11:45 pm
Forum: Molarity, Solutions, Dilutions
Topic: What is Molarity?
Replies: 11
Views: 105

Re: What is Molarity?

Molarity refers to the amount of moles of solute over the liters of the solvent. For example, 3 moles of NaCl in a single liter of water would be a 3M solution of NaCl.
by CalvinTNguyen2D
Sun Oct 20, 2019 11:43 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular to Empirical Formula
Replies: 10
Views: 114

Re: Molecular to Empirical Formula

To find the molecular formula, you'll need both the molecular mass and the mass of the empirical formula. Simply divide the molecular mass by the empirical mass, and you'll get the ratio you need to multiply the empirical formula by to find the molecular formula!
by CalvinTNguyen2D
Sun Oct 20, 2019 11:42 pm
Forum: SI Units, Unit Conversions
Topic: Accuracy vs Precision
Replies: 11
Views: 113

Re: Accuracy vs Precision

Accuracy reflects how close your measured values are to the true value, while precision reflects how close together your measurements were! Precision doesn't necessarily have to be close to the true value, just closely grouped together.
by CalvinTNguyen2D
Sun Oct 20, 2019 11:30 pm
Forum: Significant Figures
Topic: %Mass Composition
Replies: 12
Views: 124

Re: %Mass Composition

If there's no specification, I tend to round to 4 sig figs to keep it relatively precise and accurate; if there are sig figs listed or given in the problem, then just follow those standard conventions!
by CalvinTNguyen2D
Sun Oct 20, 2019 11:29 pm
Forum: Balancing Chemical Reactions
Topic: Balancing equations.
Replies: 12
Views: 152

Re: Balancing equations.

It's always best to start with the more rare elements first when balancing, then steadily make your way to the more common ones like Oxygen or Hydrogen! It's also very handy to keep a registrar of sorts to keep track of the different element you have!
by CalvinTNguyen2D
Sun Oct 13, 2019 7:27 pm
Forum: Significant Figures
Topic: Sig Figs at the Beginning or End
Replies: 14
Views: 150

Re: Sig Figs at the Beginning or End

Round to your sig figs at the very end of calculating; if you do it at the very beginning, your calculations will steadily grow more and more inaccurate because of all the rounding errors that compounded on each other. I like to keep really high amounts of precision with my early calculations so I c...
by CalvinTNguyen2D
Sun Oct 13, 2019 7:24 pm
Forum: Balancing Chemical Reactions
Topic: Any Easy Way
Replies: 10
Views: 99

Re: Any Easy Way

It definitely can get tedious, but I start with the least common or rarest element within the equation. Once you get these balanced, you usually won't have to go back and rebalance them in the future. Definitely leave Oxygen and Hydrogen for last- they can be really annoying to balance because of ho...
by CalvinTNguyen2D
Sun Oct 13, 2019 7:19 pm
Forum: Empirical & Molecular Formulas
Topic: Nomenclature
Replies: 11
Views: 135

Re: Nomenclature

At this level of chemistry, a lot of the nomenclature will be provided to you in the question. I think as we go further in 14B, we'll need to start learning the actual names, formulas, and groups of molecules we see in questions.
by CalvinTNguyen2D
Sun Oct 13, 2019 7:13 pm
Forum: Properties of Light
Topic: Quanta- clear up comparison
Replies: 3
Views: 32

Re: Quanta- clear up comparison

On the macro scale, or on the scale where we usually view the world, the water flowing out of the bucket looks like it's flowing as a single continuous substance. However, when you zoom into the actual water, you'll see that the water as a whole is actual comprised of individual water molecules. Lik...
by CalvinTNguyen2D
Sun Oct 13, 2019 7:09 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 Grading
Replies: 12
Views: 196

Re: Test 1 Grading

I didn't realise we'd just get 10 points for taking the test, but my TA definitely said they'd give out partial credit whenever possible. It's definitely a good idea to just write down as much work as possible so they can award you for what you have.
by CalvinTNguyen2D
Sun Oct 13, 2019 7:07 pm
Forum: Significant Figures
Topic: Significant Figures on Test 1
Replies: 3
Views: 74

Re: Significant Figures on Test 1

My TA said that we shouldn't worry too much about sig figs! They might be graded lightly, if at all, but we should still know the basic rules behind them just in case.
by CalvinTNguyen2D
Sat Oct 05, 2019 12:35 pm
Forum: Properties of Light
Topic: Classical Mechanics vs. Quantum Mechanics
Replies: 4
Views: 29

Classical Mechanics vs. Quantum Mechanics

Could anybody help explain the differences between Classical Mechanics and Quantum Mechanics? I was a little bit confused by how the lecture example of water pouring out of a bucket could be modeled by both types of mechanics. Thanks!
by CalvinTNguyen2D
Sat Oct 05, 2019 12:32 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula Purpose
Replies: 13
Views: 138

Re: Empirical Formula Purpose

Empirical formulas are useful to quickly determine the ratios of atoms in proportion to one another. Larger hydrocarbons, such as heptane (C6H14), can be reduced to a simpler ratio of C3H7. It's also widely used to represent ionic compounds (for example, CaCl2 or NaCl).
by CalvinTNguyen2D
Sat Oct 05, 2019 12:22 pm
Forum: SI Units, Unit Conversions
Topic: Homework for Week 1
Replies: 16
Views: 256

Re: Homework for Week 1

I think it should be fine to write in pencil! I've seen some people using one or the other, so it's probably up to personal preference- you should still talk to your TA just to confirm if he or she has any preference.
by CalvinTNguyen2D
Sat Oct 05, 2019 12:17 pm
Forum: SI Units, Unit Conversions
Topic: Homework
Replies: 9
Views: 146

Re: Homework

I do mine in pencil- I tend to make quite a few stray marks or errors in my work, so I like to be able to erase anything so I won't get lost in my train of thought!
by CalvinTNguyen2D
Sat Oct 05, 2019 12:12 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Use of Avogadro's number
Replies: 3
Views: 34

Re: Use of Avogadro's number

It's also good to distinguish specifically between Avogadro's number and Avogadro's constant! Avogadro's number is just the number 6.0221x10^23, and does not include any units. Avogadro's constant is Avogadro's number INCLUDING the units, measuring the amount of atoms, particles, molecules, or formu...
by CalvinTNguyen2D
Sat Sep 28, 2019 2:21 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molar Mass
Replies: 2
Views: 78

Re: Molar Mass

For the problem, the main issue is to find the unknown metal in the metal hydroxide, M(OH)2. We already know the molar mass of the entire metal oxide is 74.10, so in order to find the molar mass of M, we need to subtract the masses of the two Hydroxide groups molar mass M = 74.10 g/mol - 34.02 g/mol...
by CalvinTNguyen2D
Sat Sep 28, 2019 2:08 pm
Forum: Significant Figures
Topic: Sig Figs on Molar Masses
Replies: 4
Views: 74

Re: Sig Figs on Molar Masses

Thanks! Also in regards to E.21B, the solutions manual rounded the moles of HF to 1.30x10-3 mol, but there were four sig figs in the problem (25.92 mg). Does anyone know why they would round the number to 3 sig figs instead?
by CalvinTNguyen2D
Sat Sep 28, 2019 1:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Formatting homework
Replies: 12
Views: 152

Re: Formatting homework

I'm using binder paper as well. Does anybody know if we need headers indicating our discussion or lecture at the top?
by CalvinTNguyen2D
Sat Sep 28, 2019 1:48 pm
Forum: Significant Figures
Topic: Sig Figs on Molar Masses
Replies: 4
Views: 74

Sig Figs on Molar Masses

Hello, I had a question about rounding significant figures within molar masses! In problem E.21B, we need to calculate the molar mass of Hydrogen Fluoride. Adding the molar masses of Hydrogen and Fluoride gives us 20.008 g/mol, but the solutions manual rounds it up to 20.01 g/mol instead. Should we ...
by CalvinTNguyen2D
Sat Sep 28, 2019 1:39 pm
Forum: SI Units, Unit Conversions
Topic: Nomenclature
Replies: 4
Views: 123

Re: Nomenclature

Hey there! Nomenclature is a bit hard to get going at first, but once you get the hang of it it's a lot more straightforward! The first thing to do is to identify whether a compound is ionic or molecular- ionic compounds will have a metal element in them, while molecular compounds will have non-meta...

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