Search found 84 matches

by Siwa Hwang 3G
Mon Feb 22, 2021 12:21 am
Forum: Van't Hoff Equation
Topic: Celcius vs Kelvin for T1 and T2
Replies: 61
Views: 290

Re: Celcius vs Kelvin for T1 and T2

it depends on the unit of ideal gas number or specific heat capacity
by Siwa Hwang 3G
Mon Feb 22, 2021 12:20 am
Forum: Student Social/Study Group
Topic: Preparing
Replies: 24
Views: 84

Re: Preparing

Youtube practice problems help a lot :)
by Siwa Hwang 3G
Mon Feb 22, 2021 12:18 am
Forum: Student Social/Study Group
Topic: Balance / Self Care Tips
Replies: 39
Views: 91

Re: Balance / Self Care Tips

stay hydrated, always
by Siwa Hwang 3G
Mon Feb 22, 2021 12:18 am
Forum: Student Social/Study Group
Topic: We made it through Midterm 2!
Replies: 58
Views: 158

Re: We made it through Midterm 2!

Congrats everyone:) I hope you guys performed well on the midterm!
by Siwa Hwang 3G
Mon Feb 22, 2021 12:17 am
Forum: Student Social/Study Group
Topic: Chem 14B Final
Replies: 37
Views: 83

Re: Chem 14B Final

Go to step up sessions and solve textbook practice problems!
by Siwa Hwang 3G
Sun Feb 14, 2021 1:37 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Kelvin conversion
Replies: 40
Views: 85

Re: Kelvin conversion

add 273 to the given Celsius value
by Siwa Hwang 3G
Sun Feb 14, 2021 1:37 am
Forum: Van't Hoff Equation
Topic: Entropy
Replies: 10
Views: 257

Re: Entropy

I believe that entropy is constant when using the Van Hoff’s equation so you should apply different equation to calculate the change in entropy
by Siwa Hwang 3G
Sun Feb 14, 2021 1:36 am
Forum: Student Social/Study Group
Topic: Studying When You Don't Want to
Replies: 48
Views: 136

Re: Studying When You Don't Want to

I get myself in the mood for studying by drinking a cup of hot tea or listening to white-noise music
by Siwa Hwang 3G
Sun Feb 14, 2021 1:34 am
Forum: Van't Hoff Equation
Topic: usage
Replies: 9
Views: 122

Re: usage

You can use it to find different components of the reaction such as delta H and K when Temperature changes.
by Siwa Hwang 3G
Mon Feb 08, 2021 3:51 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: dT versus ΔT
Replies: 8
Views: 27

Re: dT versus ΔT

Follow up question, do we use the same equation for a system with constant pressure vs constant volume?
by Siwa Hwang 3G
Sun Feb 07, 2021 11:55 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Work on a system
Replies: 27
Views: 84

Re: Work on a system

When external pressure increases or volume decreases
by Siwa Hwang 3G
Sun Feb 07, 2021 11:54 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Work
Replies: 39
Views: 95

Re: Work

when the system is doing work, the reaction is exothermic. Therefore the work is negative.
by Siwa Hwang 3G
Sun Feb 07, 2021 11:53 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: R Constant
Replies: 88
Views: 242

Re: R Constant

I believe that it depends on the context/equation youre using to solve the problem
by Siwa Hwang 3G
Sun Feb 07, 2021 11:53 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Does phase matter in Hess's Law?
Replies: 17
Views: 47

Re: Does phase matter in Hess's Law?

Phase matters in all aspects of chemistry because heat moves in and out whenever there is a heat change
by Siwa Hwang 3G
Sun Feb 07, 2021 11:52 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Study Approach thermodynamics
Replies: 8
Views: 23

Re: Study Approach thermodynamics

Watch youtube videos with diagrams that help you visualize the problem
by Siwa Hwang 3G
Sat Jan 30, 2021 8:42 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Work Definition
Replies: 19
Views: 86

Re: Work Definition

Work is a force that causes movement in the system.
by Siwa Hwang 3G
Sat Jan 30, 2021 8:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Making X negligible
Replies: 34
Views: 97

Re: Making X negligible

x is negligible when the equilibrium constant is less than 10^-4
by Siwa Hwang 3G
Sat Jan 30, 2021 8:41 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Sapling Week 3 #5
Replies: 7
Views: 77

Re: Sapling Week 3 #5

Always make sure to multiply the enthalpy by a constant that you multiplied the reaction coefficients by
by Siwa Hwang 3G
Sat Jan 30, 2021 8:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE table, when to divide by L
Replies: 5
Views: 32

Re: ICE table, when to divide by L

Divide by volume when the mole of reactant or products are given to find the molarity
by Siwa Hwang 3G
Sat Jan 30, 2021 8:36 pm
Forum: Phase Changes & Related Calculations
Topic: when to assume x is insignificant
Replies: 83
Views: 190

Re: when to assume x is insignificant

You can assume that x is insignificant when K is less than 1x10^-4 !!
by Siwa Hwang 3G
Fri Jan 22, 2021 3:14 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Ka vs. Kb
Replies: 30
Views: 123

Re: Ka vs. Kb

Respective letters -- a and b -- represent acid and base
by Siwa Hwang 3G
Fri Jan 22, 2021 3:12 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: neutral solution
Replies: 9
Views: 117

Re: neutral solution

acidity also changes slightly depending the temperature !!
by Siwa Hwang 3G
Fri Jan 22, 2021 3:11 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Studying for Midterm #1
Replies: 63
Views: 179

Re: Studying for Midterm #1

solve as many practice problems as you can ~
by Siwa Hwang 3G
Tue Jan 19, 2021 7:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Water in Reactions
Replies: 7
Views: 47

Re: Water in Reactions

when the water is in aqueous or gaseous form
by Siwa Hwang 3G
Tue Jan 19, 2021 6:58 pm
Forum: Student Social/Study Group
Topic: Motivation
Replies: 34
Views: 172

Re: Motivation

play hard and study hard; give it all you got whether you are sitting infant of ur desk studying or going out enjoying your day.
by Siwa Hwang 3G
Mon Jan 18, 2021 1:01 am
Forum: Student Social/Study Group
Topic: Advice for study
Replies: 31
Views: 92

Re: Advice for study

I find solving textbook problems or any sorts of practice questions on youtube helpful !
by Siwa Hwang 3G
Mon Jan 18, 2021 12:58 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Week 1 #5
Replies: 8
Views: 65

Re: Sapling Week 1 #5

You should multiply the k’s to get the final reaction constant
by Siwa Hwang 3G
Tue Jan 12, 2021 5:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kw= 1.0 x 10^-14
Replies: 11
Views: 88

Re: Kw= 1.0 x 10^-14

If you multiply the connections of h30 and oh which are both 10^-7, you obtain kw = 10^-14
by Siwa Hwang 3G
Tue Jan 12, 2021 5:36 pm
Forum: Student Social/Study Group
Topic: New Year Resolutions?
Replies: 54
Views: 210

Re: New Year Resolutions?

Maintaining a consistent studying schedule :)
by Siwa Hwang 3G
Sat Jan 09, 2021 9:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5.39
Replies: 2
Views: 40

5.39

Hi, Can somebody explain the steps for this problem please? In an experiment, 0.020 mol NO was introduced into a 2 flask of volume 1.00 L and the reaction 2 NO2(g) --> N2O4(g) was allowed to come to equilibrium at 298 K. (a) Using information in Table 5E.2, calculate the equilibrium concentrations o...
by Siwa Hwang 3G
Sat Jan 09, 2021 2:11 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating concentrations using ICE Chart
Replies: 8
Views: 49

Re: Calculating concentrations using ICE Chart

If K < 10^-4, you can cancel the -x since the changes are very insignificant. If you do that, you won’t need to use the quadratic formula.
by Siwa Hwang 3G
Thu Jan 07, 2021 11:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc
Replies: 11
Views: 72

Re: Kc

Is it possible to use partial pressure for ICE table or no?
by Siwa Hwang 3G
Thu Jan 07, 2021 12:11 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Halogens
Replies: 6
Views: 74

Re: Halogens

So halogens don’t always create endothermic reactions?
by Siwa Hwang 3G
Tue Jan 05, 2021 10:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Question about sapling homework
Replies: 5
Views: 44

Re: Question about sapling homework

No. We get graded based on completion!
by Siwa Hwang 3G
Mon Jan 04, 2021 1:40 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: How do you write the K for an equation with heterogeneous equilibria?
Replies: 10
Views: 81

Re: How do you write the K for an equation with heterogeneous equilibria?

Remember that solids do NOT have concentrations since it is not composed of solvent. So leave out solids and liquids in the equilibrium equation to find the constant. Just include the concentration or pressure of gas or aqueous solution.
by Siwa Hwang 3G
Fri Dec 11, 2020 1:46 am
Forum: Lewis Acids & Bases
Topic: Water
Replies: 62
Views: 543

Re: Water

It depends on its neighboring reactants.
by Siwa Hwang 3G
Fri Dec 11, 2020 1:45 am
Forum: Student Social/Study Group
Topic: Studying
Replies: 13
Views: 129

Re: Studying

I find solving practice problems from Organic Chemistry Tutor videos very helpful to get the basic problem solving skills down.
by Siwa Hwang 3G
Fri Dec 11, 2020 1:44 am
Forum: Polyprotic Acids & Bases
Topic: How can you tell
Replies: 18
Views: 391

Re: How can you tell

Polyprotic atoms are capable of donating more than one protons.
by Siwa Hwang 3G
Fri Dec 11, 2020 1:42 am
Forum: Polyprotic Acids & Bases
Topic: Which one is more acidic: H3PO3 or H3PO4
Replies: 9
Views: 70

Re: Which one is more acidic: H3PO3 or H3PO4

H3PO4 is more acidic since it has a greater number of oxygen atoms bonded to the central atom.
by Siwa Hwang 3G
Fri Dec 11, 2020 1:40 am
Forum: Octet Exceptions
Topic: Octet Exceptions and Expanded Octet Calculation
Replies: 3
Views: 57

Re: Octet Exceptions and Expanded Octet Calculation

Hi! p-black atoms from n=3 and higher can have extended octet since they have the d-orbital in valence shell that can fit additional electrons.
by Siwa Hwang 3G
Fri Dec 11, 2020 1:39 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty in position
Replies: 4
Views: 62

Re: Uncertainty in position

Find 1% of 0.05 nm by multiplying 0.01 and 0.05
by Siwa Hwang 3G
Fri Dec 11, 2020 1:37 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Textbook Question 2A19)
Replies: 2
Views: 26

Re: Textbook Question 2A19)

Electron configuration of Ni 2+ is [Ar] 3d8. Therefore, there are 3 electron pairs and 2 unpaired single electrons.
by Siwa Hwang 3G
Sun Dec 06, 2020 9:52 pm
Forum: Bronsted Acids & Bases
Topic: Strong & Weak Acid
Replies: 6
Views: 45

Strong & Weak Acid

Is there a way to distinguish strong acids and weak acids by just looking at the formula of the compound?
by Siwa Hwang 3G
Sun Dec 06, 2020 9:50 pm
Forum: Bronsted Acids & Bases
Topic: Carboyxl group
Replies: 4
Views: 57

Carboyxl group

Why was Dr.Lavelle talking about Carboyxl group and how does it relate to Bronsted Acid?
by Siwa Hwang 3G
Sun Dec 06, 2020 9:39 pm
Forum: Student Social/Study Group
Topic: Week 8/9 Thoughts/Worries
Replies: 66
Views: 503

Re: Week 8/9 Thoughts/Worries

I’m feeling pretty good about this class since Dr.Lavelle is offering a lot of help other than lectures like step-up sessions which I’m extremely thankful for.
by Siwa Hwang 3G
Sun Dec 06, 2020 9:37 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: Transition metals
Replies: 11
Views: 210

Re: Transition metals

Transition have varying oxidation numbers depending on the bound atoms.
by Siwa Hwang 3G
Sun Dec 06, 2020 9:36 pm
Forum: Photoelectric Effect
Topic: exciting electrons
Replies: 3
Views: 46

Re: exciting electrons

No since the topics that we’re learning now (Acid&Bases, Bonds) deals with transfer of electrons between atoms and not exciting electrons.
by Siwa Hwang 3G
Fri Nov 27, 2020 12:54 am
Forum: Student Social/Study Group
Topic: How have your study habits changed?
Replies: 45
Views: 342

Re: How have your study habits changed?

I rely heavily on textbook problems to get the extra practice that I need and read through the textbook chapters so that I get a thorough understanding of the topics.
by Siwa Hwang 3G
Fri Nov 27, 2020 12:51 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Clarification on ligands
Replies: 6
Views: 78

Re: Clarification on ligands

Is there a difference between ligands and Lewis base?
by Siwa Hwang 3G
Fri Nov 27, 2020 12:50 am
Forum: Determining Molecular Shape (VSEPR)
Topic: coplanar?
Replies: 9
Views: 73

Re: coplanar?

It means atoms lie in a simple plane, like x,y, or z-coordinate plane.
by Siwa Hwang 3G
Sun Nov 22, 2020 5:23 pm
Forum: Bond Lengths & Energies
Topic: electron repulsion
Replies: 15
Views: 151

Re: electron repulsion

We can assume that electron repulsion is present in every atom that has more than one electron.
by Siwa Hwang 3G
Sun Nov 22, 2020 5:19 pm
Forum: Student Social/Study Group
Topic: How to relax after midterms
Replies: 54
Views: 292

Re: How to relax after midterms

I like to go for a drive while listening to calming music!
by Siwa Hwang 3G
Thu Nov 19, 2020 3:48 am
Forum: Octet Exceptions
Topic: Expanded Octet and the 3d orbital
Replies: 3
Views: 37

Re: Expanded Octet and the 3d orbital

XeF4 is an example of expanded octet where Xe (the central atom) has 4 bonds and 2 long pairs. The electron configuration of Xe is [Kr] 4d10 5s2 5p6
by Siwa Hwang 3G
Tue Nov 17, 2020 12:40 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Number Practice
Replies: 3
Views: 58

Re: Quantum Number Practice

There are more practice problems in Focus 1 & 2 which are at the end of Chapter 1 and 2.
by Siwa Hwang 3G
Sat Nov 14, 2020 1:04 am
Forum: Lewis Structures
Topic: Resonance Hybrid
Replies: 5
Views: 69

Re: Resonance Hybrid

It is a structure that allows the molecule to reach the lowest energy level, in another words, formal charge of elements nearest to zero.
by Siwa Hwang 3G
Thu Nov 12, 2020 7:42 pm
Forum: Ionic & Covalent Bonds
Topic: Intramolecular force vs Intermolecular force
Replies: 3
Views: 31

Intramolecular force vs Intermolecular force

What is the difference between intramolecular force and intermolecular force? And which category would hydrogen bond belong to?
by Siwa Hwang 3G
Thu Nov 12, 2020 2:33 am
Forum: Ionic & Covalent Bonds
Topic: Hydrogen Bond & Density
Replies: 1
Views: 30

Hydrogen Bond & Density

On today’s lecture, Dr.Lavelle said that ice is less dense than water due to hydrogen bond. Does this mean that hydrogen bonds in ice are shorter so that the bound atoms are closer to each other?

Can somebody explain this please. Thank you!
by Siwa Hwang 3G
Wed Nov 11, 2020 11:38 am
Forum: Trends in The Periodic Table
Topic: Textbook Problem Ionization Energy Oxygen
Replies: 3
Views: 35

Re: Textbook Problem Ionization Energy Oxygen

This is because oxygen is the first element encountered in which the p orbital electron must be paired. Therefore oxygen experiences electron repulsion, lowering the ionization energy.
by Siwa Hwang 3G
Wed Nov 11, 2020 11:36 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Writing ground-state e- configurations
Replies: 3
Views: 30

Re: Writing ground-state e- configurations

As long as we write out the valence electrons, both methods should work just fine!
by Siwa Hwang 3G
Sat Nov 07, 2020 1:13 am
Forum: Ionic & Covalent Bonds
Topic: Electronegativity
Replies: 16
Views: 115

Electronegativity

Why does Fluorine have the highest electronegativity energy?
by Siwa Hwang 3G
Thu Nov 05, 2020 5:31 pm
Forum: Lewis Structures
Topic: Radicals
Replies: 9
Views: 94

Re: Radicals

okay this makes a lot more sense now. Thank you everyone!
by Siwa Hwang 3G
Wed Nov 04, 2020 11:59 pm
Forum: Lewis Structures
Topic: Radicals
Replies: 9
Views: 94

Radicals

Can somebody explain what radicals are? I don’t really understand how the radicals apply to the octet guideline.

Thank you!
by Siwa Hwang 3G
Tue Nov 03, 2020 10:20 pm
Forum: Lewis Structures
Topic: sides
Replies: 12
Views: 137

Re: sides

I believe that it doesn’t matter where you place the bonding atoms because lewis structure is a model that we use to hypothesize the location of atoms.
by Siwa Hwang 3G
Mon Nov 02, 2020 5:25 pm
Forum: Resonance Structures
Topic: Single vs. Double Bonds
Replies: 5
Views: 43

Re: Single vs. Double Bonds

I think we’re gonna get the answer to this on Wednesday’s lecture when Dr.Lavelle talks talks about sigma and pie bonds.
by Siwa Hwang 3G
Fri Oct 30, 2020 10:38 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 237
Views: 36161

Re: Final Jitters

I like to stretch for 5 minutes especially my neck and shoulders before taking a test :)
by Siwa Hwang 3G
Fri Oct 30, 2020 1:10 am
Forum: Student Social/Study Group
Topic: How to relax
Replies: 125
Views: 690

Re: How to relax

I usually release stress by playing or taking naps with my cats :>
by Siwa Hwang 3G
Thu Oct 29, 2020 3:26 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: 1A. 15, Question about Electron Excitement, Ground State
Replies: 2
Views: 33

Re: 1A. 15, Question about Electron Excitement, Ground State

Yes. n=1 is the final energy level and n=3 is the initial energy level.
So the electron starts of at an initial level, gets excited to a higher level, and emits energy AS it returns to its ground state.
by Siwa Hwang 3G
Wed Oct 28, 2020 12:59 am
Forum: Photoelectric Effect
Topic: Finding the wavelength of an ejected atom
Replies: 4
Views: 43

Re: Finding the wavelength of an ejected atom

Okay I followed your guys’ instruction and I got 1.87 x 10 ^-9 m.
by Siwa Hwang 3G
Mon Oct 26, 2020 8:01 pm
Forum: Photoelectric Effect
Topic: Finding the wavelength of an ejected atom
Replies: 4
Views: 43

Finding the wavelength of an ejected atom

If the wavelength of incident light on sodium metal was 810 nm, and the work function of sodium is 1.1 eV, what is the wavelength of the ejected electron? I found the KE of an ejected atom using E - work function = KE but I don’t know how to find the wavelength. Is there a specific formula that I sh...
by Siwa Hwang 3G
Sun Oct 25, 2020 11:25 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Magnetic quantum
Replies: 2
Views: 11

Re: Magnetic quantum

l refers to the subshells of the electron (S,p,d,f) and ml refers to the orientation of the electron in a subshell (i.e. p orbital has px, py, and pz orbitals)
by Siwa Hwang 3G
Thu Oct 22, 2020 6:17 pm
Forum: DeBroglie Equation
Topic: Smallest Measurable Wavelength
Replies: 7
Views: 60

Re: Smallest Measurable Wavelength

Using the De Broglie Equation, you get wavelength = h / (0.155kg x 85 m/sec) = 5.03 x 10^-35m. This wavelength is significantly smaller than the wavelength of an electron (10^12) so it can not be measured.
by Siwa Hwang 3G
Wed Oct 21, 2020 10:47 pm
Forum: Properties of Light
Topic: Wavelengths in Light Spectrum
Replies: 9
Views: 82

Re: Wavelengths in Light Spectrum

Yes. You should memorize the order and corresponding wavelegths of the lights. An acronym that should help you with memorizing the order of the lights is : Real Monkeys Insist Very Useful X-mas Gifts. Also, don’t forget to memorize the order of colors in the visible lights spectrum.
by Siwa Hwang 3G
Tue Oct 20, 2020 2:30 pm
Forum: DeBroglie Equation
Topic: De Brogile Wavelength Car Ex. from Lecture 8
Replies: 7
Views: 82

Re: De Brogile Wavelength Car Ex. from Lecture 8

Electron in an atom has a wavelength of 10^-12m so any wavelength that is smaller than a picometer is undetectable. Therefore, 1.64x10^-38 is not a detectable wavelength.
by Siwa Hwang 3G
Tue Oct 20, 2020 2:24 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation
Replies: 2
Views: 35

Re: Rydberg equation

It’s 1/Lamda !
by Siwa Hwang 3G
Fri Oct 16, 2020 2:55 pm
Forum: Properties of Electrons
Topic: Electron Transition
Replies: 7
Views: 36

Re: Electron Transition

Electron transition occurs when an electron get hits by an external light and gains energy to move up to a higher level or releases energy to return to the ground level.
by Siwa Hwang 3G
Thu Oct 15, 2020 2:53 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Difference regarding atomic spectroscopy and molecular spectroscopy
Replies: 3
Views: 55

Re: Difference regarding atomic spectroscopy and molecular spectroscopy

Dr.Lavelle only went over the atomic spectra in past lectures so I think he’s going to go over the molecular spectra in depth in the future.
by Siwa Hwang 3G
Thu Oct 15, 2020 2:52 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Variables in E(n)=-hR/n^2
Replies: 3
Views: 49

Re: Variables in E(n)=-hR/n^2

E(n) represents the energy of a level that the electron is located in.
n can represent both final and initial energy level. For example, you can do E(n1) - E(n2) to find the change of energy.
by Siwa Hwang 3G
Wed Oct 14, 2020 1:48 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: 1.A.15 on Homework
Replies: 6
Views: 48

Re: 1.A.15 on Homework

Use the Rydberg Equation and remember that the light is part of the Lynman series, which makes n1=1 not n2. (n1 is the final level). First, convert the given wavelength to meters and plug into c=hv to find the frequency of the light Second, plug in the calculated v, n1=1, and Rydberg constant into i...
by Siwa Hwang 3G
Mon Oct 12, 2020 11:51 pm
Forum: Photoelectric Effect
Topic: Textbook Reading
Replies: 1
Views: 30

Re: Textbook Reading

Hi, Daniel

1C covers wave function which is a topic that is included in the Quantum world unit so I recommend that you read over it to understand the material better. It may not have been required in the syllabus because other reading sections or future lecture may go over it.
by Siwa Hwang 3G
Sat Oct 10, 2020 12:18 am
Forum: Limiting Reactant Calculations
Topic: Last Question on the Sapling Hw (Week 1)?
Replies: 12
Views: 165

Re: Last Question on the Sapling Hw (Week 1)?

First, convert the .20ml to grams by using the density given. Then convert the grams to moles by dividing by the molar mass of butanone. With the moles of butanone, multiply by the ratio which is 1:1 to convert to methyl. Finally, convert the moles of methyl to grams by multiplying by the molar mass...
by Siwa Hwang 3G
Thu Oct 08, 2020 3:32 pm
Forum: Empirical & Molecular Formulas
Topic: Writing Formula Order
Replies: 6
Views: 46

Re: Writing Formula Order

When writing down empirical formulas, carbon always comes first, then hydrogen, then rest of the elements follow by alphabetical order.
by Siwa Hwang 3G
Wed Oct 07, 2020 3:40 pm
Forum: Molarity, Solutions, Dilutions
Topic: Fundamentals Section G 13
Replies: 3
Views: 41

Re: Fundamentals Section G 13

Im pretty sure that the use of calculator is permitted in class; however, it will be a lot more convenient for you to get comfortable with decimal-to-scientific notation conversions. For example, 100ml of the diluted solution is 0.1L which can also be written as 1.0x10^-1 L and 0.01 mol Nitrogen ato...
by Siwa Hwang 3G
Tue Oct 06, 2020 8:56 pm
Forum: Properties of Light
Topic: Work Function Explanation
Replies: 3
Views: 58

Re: Work Function Explanation

If you look at the work function equation, E=h(f0),
E (the work function) depends on the the threshold frequency of the light. Therefore, work function is not constant.

*h stands for Planck’s constant
by Siwa Hwang 3G
Mon Oct 05, 2020 5:51 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity Question from Lecture 10/5
Replies: 5
Views: 84

Re: Molarity Question from Lecture 10/5

If you multiply the coefficient by the subscript of the element, you can see that the number of moles on the reactant side equals to the number of moles on the product side. For example, there are two H2 atoms on the left side which is 2 x 2 = 4 Hydrogen atoms. And 2 Hydrogen atoms from NaoH ( 2 x 1...

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