Search found 101 matches

by KSong_1J
Sat Mar 14, 2020 12:23 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Adding a Catalyst
Replies: 6
Views: 84

Re: Adding a Catalyst

Catalysts do not affect the equilibrium constant. They create a different pathway and, since the equations for K is k over k prime, there shouldn't be a change in K
by KSong_1J
Sat Mar 14, 2020 12:17 pm
Forum: Second Order Reactions
Topic: Third Order Reactions
Replies: 3
Views: 45

Re: Third Order Reactions

Since Lavelle said he's making the final short and straightforward I don't think he's going to have third order reactions on the exam
by KSong_1J
Sat Mar 14, 2020 12:08 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: elementary rate law
Replies: 4
Views: 51

Re: elementary rate law

An overall rate law is made up of elementary rate laws (which I believe represents what actually happens in a reaction at a molecular level).
by KSong_1J
Sat Mar 14, 2020 11:57 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation
Replies: 3
Views: 12

Re: Arrhenius Equation

It can be used to see how activation energy and/or temperature affects the rate constant
by KSong_1J
Sat Mar 14, 2020 11:55 am
Forum: General Science Questions
Topic: Who makes the Final
Replies: 23
Views: 287

Re: Who makes the Final

I believe Lavelle makes the final
by KSong_1J
Sat Mar 14, 2020 11:45 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Week 10 Review Problems
Replies: 4
Views: 46

Re: Week 10 Review Problems

Yes, you need a solid metal on that side
by KSong_1J
Sat Mar 14, 2020 11:30 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: k
Replies: 7
Views: 69

Re: k

Yes, usually a larger k results in a faster rate of reaction
by KSong_1J
Sat Mar 14, 2020 11:28 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Concentration Cells
Replies: 2
Views: 65

Re: Concentration Cells

I believe in a concentration cell usually oxidation occurs at the cell with the lower concentration (so this will be the anode) and reduction occurs at the cell with higher concentration (cathode).
by KSong_1J
Sat Mar 14, 2020 11:23 am
Forum: First Order Reactions
Topic: k versus k prime
Replies: 6
Views: 59

Re: k versus k prime

k is the rate constant for the forward reaction, while k prime is the rate constant for the reverse reaction
by KSong_1J
Sat Mar 14, 2020 10:14 am
Forum: Balancing Redox Reactions
Topic: OH vs H
Replies: 12
Views: 116

Re: OH vs H

No, you would use OH- to balance basic solutions instead of H+. However, you do use H2O for balancing in both acidic and basic solutions
by KSong_1J
Fri Mar 13, 2020 8:31 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Steady State
Replies: 2
Views: 12

Re: Steady State

I think Lavelle said in lecture that we will not be using the steady state method, which is why he didn’t assign any problems where we needed to use that method!
by KSong_1J
Fri Mar 13, 2020 8:25 pm
Forum: *Organic Reaction Mechanisms in General
Topic: 7B.17
Replies: 1
Views: 64

Re: 7B.17

It’s given in the problem; the first sentence says “each of the following second-order reactions.”
by KSong_1J
Fri Mar 13, 2020 8:20 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalyst in Reaction
Replies: 1
Views: 12

Re: Catalyst in Reaction

Catalysts lower the activation energy of a reaction by creating an alternate pathway. Since a higher activation energy leads to a slower rate of reaction, by lowering the activation energy, the catalyst increases the rate of reaction.
by KSong_1J
Fri Mar 13, 2020 8:03 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: 7B.1
Replies: 3
Views: 51

Re: 7B.1

You plug the initial mass into [A]initial! I suggest rearranging the equation to [A] = [A]initial*e^-kt to make it easier to solve (since you’re solving for [A]) and don’t forget to convert 5.0 hours into minutes (since the units for k is given as min^-1)! Hope this helps :)
by KSong_1J
Fri Mar 13, 2020 9:36 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: F in the equation for standard Gibbs energy
Replies: 4
Views: 63

Re: F in the equation for standard Gibbs energy

F is Faraday's constant (96,485 C·mol^-1)!
by KSong_1J
Thu Mar 12, 2020 7:47 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Topics
Replies: 10
Views: 85

Re: Final Topics

The final is cumulative so it's going to cover outlines 1-6!
by KSong_1J
Thu Mar 12, 2020 7:41 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: What was your favorite chem topic?
Replies: 24
Views: 388

Re: What was your favorite chem topic?

I think quantum from 14A was my favorite and I love chemical equilibrium from 14B!
by KSong_1J
Thu Mar 12, 2020 7:37 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts and Rates
Replies: 10
Views: 63

Re: Catalysts and Rates

Question 7.17E asks whether a catalyst accelerating the third step of a three step reaction would increase the overall rate of reaction. Why is the answer no? I think the answer is no because the rate of the overall reaction depends on the slowest step of the reaction and the third step is the fast...
by KSong_1J
Thu Mar 12, 2020 7:32 pm
Forum: Administrative Questions and Class Announcements
Topic: Chemistry community posts
Replies: 3
Views: 45

Re: Chemistry community posts

I think as long as you have 100 or more posts you should be fine (50 from 14A and 50 from 14B)!
by KSong_1J
Tue Mar 10, 2020 11:38 pm
Forum: Administrative Questions and Class Announcements
Topic: What is the plan for the final?
Replies: 16
Views: 198

Re: What is the plan for the final?

He just sent an email saying it will be a take home final!
by KSong_1J
Sun Feb 16, 2020 11:20 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: gibbs free energy -RTlnk
Replies: 2
Views: 22

Re: gibbs free energy -RTlnk

I think this equation is used for the system at equilibrium, which is why K (equilibrium constant) is in there!
by KSong_1J
Sun Feb 16, 2020 11:15 pm
Forum: General Science Questions
Topic: homework for week 7
Replies: 7
Views: 65

Re: homework for week 7

I think 5G and 5J from thermodynamics, since 5G talks about the relationship between delta G and K, and 5J talks about the van’t Hoff equation (both of which we covered in lecture on Friday)!
by KSong_1J
Sun Feb 16, 2020 11:12 pm
Forum: Van't Hoff Equation
Topic: Significance of Van't Hoff Equation
Replies: 8
Views: 83

Re: Significance of Van't Hoff Equation

Regarding the reaction, the van’t Hoff equation is basically just telling us that an increase in temperature favors the formation of products if it’s an endothermic reaction, and it favors the formation of reactants if it’s exothermic. Page 433 of the textbook explains this more thoroughly!
by KSong_1J
Sun Feb 16, 2020 11:07 pm
Forum: Phase Changes & Related Calculations
Topic: Fusion = Melting?
Replies: 7
Views: 114

Re: Fusion = Melting?

Yes fusion is the same as melting; it’s the phase change from a solid to a liquid
by KSong_1J
Sun Feb 16, 2020 10:57 pm
Forum: General Science Questions
Topic: Studying
Replies: 19
Views: 146

Re: Studying

Doing all the practice problems he gives us is very helpful, as well as making sure you completely understand all the learning objectives! I also recommend watching organic chemistry tutor on YouTube if you don’t understand a concept
by KSong_1J
Sun Feb 09, 2020 10:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm dates
Replies: 11
Views: 86

Re: Midterm dates

The midterm will cover equilibrium, acids/bases, thermochemistry, and thermodynamics (only the first page of the thermodynamics learning outcomes will be covered)
by KSong_1J
Sun Feb 09, 2020 10:26 pm
Forum: Student Social/Study Group
Topic: Midterm Studying
Replies: 5
Views: 82

Re: Midterm Studying

Definitely go over all of Lavelle’s learning outcomes on his website! It might also be helpful to create a list of all the equations that tells you under what conditions to use them/in what type of problems. Also, at the end of each section right before the problems there’s a section that says “the ...
by KSong_1J
Sun Feb 09, 2020 10:18 pm
Forum: Phase Changes & Related Calculations
Topic: closed vs isolated
Replies: 10
Views: 72

Re: closed vs isolated

A closed system can exchange energy with its surroundings but not matter, while an isolated system can’t exchange matter or energy with its surroundings. An example of an isolated system would be a thermos (insulated, neither matter nor energy can be exchanged) and an example of a closed system coul...
by KSong_1J
Sun Feb 09, 2020 10:10 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Favorability of Endothermic Reactions
Replies: 5
Views: 45

Re: Favorability of Endothermic Reactions

Yes because at higher temperatures there’s more heat and since endothermic reactions absorb heat, the reaction will occur/tend towards the products
by KSong_1J
Sun Feb 09, 2020 10:05 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Kelvin or Celsius?
Replies: 47
Views: 798

Re: Kelvin or Celsius?

I think you use Kelvin because the gas constant R always has Kelvin in the denominator so they cancel out!
by KSong_1J
Sun Feb 02, 2020 8:21 pm
Forum: General Science Questions
Topic: Extra Credit
Replies: 19
Views: 226

Re: Extra Credit

Unfortunately I don’t believe Dr Lavelle offers extra credit opportunities
by KSong_1J
Sun Feb 02, 2020 8:11 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Phase change
Replies: 20
Views: 131

Re: Phase change

Delta H is positive because energy must be used to break the bonds to turn ice into a liquid
by KSong_1J
Sun Feb 02, 2020 8:08 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Temperature
Replies: 14
Views: 81

Re: Temperature

A negative delta H is exothermic because when energy leaves a constant pressure system as heat, the enthalpy of the system decreases by that amount.
by KSong_1J
Sun Feb 02, 2020 7:55 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: deltaU and deltaH
Replies: 4
Views: 35

Re: deltaU and deltaH

Delta U is the change in internal energy, while Delta H is the change in enthalpy. The internal energy of a system is the total energy in the system (sum of potential and kinetic energy) while enthalpy is the heat energy that is absorbed or released in a chemical reaction. They’re related in that th...
by KSong_1J
Sun Feb 02, 2020 7:45 pm
Forum: Calculating Work of Expansion
Topic: Work
Replies: 4
Views: 30

Re: Work

Work is a form of energy; when work is done on a system, that means that energy is transferred into the system by its surroundings. The textbook definition of work states that it’s “the process of achieving motion against an opposing force” and is equal to the product of an opposing force and distan...
by KSong_1J
Sun Jan 26, 2020 10:02 pm
Forum: Phase Changes & Related Calculations
Topic: Focus 4 Homework Questions
Replies: 3
Views: 36

Re: Focus 4 Homework Questions

In regards to what we covered in class,4C goes over the heating curve/the basics of enthalpy and 4D goes over hess’s law so for practice problems I’d say both are good but I’d focus more on 4D!
by KSong_1J
Sun Jan 26, 2020 9:56 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Week 4 Homework
Replies: 11
Views: 96

Re: Week 4 Homework

I think sections 4C and 4D cover all the recent material we’ve done in class so far so I’d do problems from those sections :)
by KSong_1J
Sun Jan 26, 2020 9:06 pm
Forum: Phase Changes & Related Calculations
Topic: Physical or Phase Changes
Replies: 7
Views: 46

Re: Physical or Phase Changes

In all the examples Lavelle has showed in class so far they were given to us so I think the values will be given
by KSong_1J
Sun Jan 26, 2020 9:01 pm
Forum: Phase Changes & Related Calculations
Topic: Class Lecture to Textbook
Replies: 2
Views: 50

Re: Class Lecture to Textbook

Section 4D.4 covers Hess’s Law! 4C and 4D cover pretty much everything we’ve gone over in class so far
by KSong_1J
Sun Jan 26, 2020 8:58 pm
Forum: Phase Changes & Related Calculations
Topic: enthalpy of phase changes
Replies: 8
Views: 51

Re: enthalpy of phase changes

The textbook states that enthalpies of fusion and vaporization are always positive and I’m pretty sure the same goes for the enthalpy of sublimation (since it’s the conversion of a solid to vapor so it’s endothermic)
by KSong_1J
Sun Jan 19, 2020 9:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5I.13
Replies: 4
Views: 49

Re: 5I.13

I’m not sure if this is the right way to do it but what I did was look at the Kc values for both and compared them. Since both are diatomic molecules, they’re more stable in the form F2/Cl2 instead of by themselves, so the one that produces more F2/Cl2 is more stable. Since the equation for Cl2 has ...
by KSong_1J
Sun Jan 19, 2020 9:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5H.1 and 5H.3?
Replies: 2
Views: 25

Re: 5H.1 and 5H.3?

For 5H.1, when you modify a reaction, the K value is also affected. So for part a, since the reaction was flipped backwards, you take the reciprocal of K (1/41) to get 0.024; for Part b, since the reaction was multiplied by 1/2, you take the square root of K to get 6.4; for Part c, since the reactio...
by KSong_1J
Sun Jan 19, 2020 9:13 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Henderson Hasselbalch Equation
Replies: 3
Views: 31

Re: Henderson Hasselbalch Equation

Dr. Lavelle said that we won’t be using the equation in 14b so I don’t think you need to worry about it!
by KSong_1J
Sun Jan 19, 2020 9:10 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Exo/Endo-thermic Rxns
Replies: 5
Views: 34

Re: Exo/Endo-thermic Rxns

Endothermic reactions absorb energy to create products while exothermic products release energy when creating products. An example that combines this idea with Le Chatelier’s principle is if you raised the temperature in a reaction; if it’s an endothermic reaction, a higher temperature will cause th...
by KSong_1J
Sun Jan 19, 2020 8:54 pm
Forum: General Science Questions
Topic: test 1
Replies: 8
Views: 78

Re: test 1

Test #1 begins on Tuesday, January 21 in our discussion sections and yes it’s chemical equilibrium and acids and bases (basically everything we’ve learned so far)!
by KSong_1J
Sun Jan 12, 2020 7:21 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: increasing N2
Replies: 5
Views: 49

Re: increasing N2

If you increase the N2, then the equilibrium will want to shift towards the right to create more ammonia. Creating more ammonia requires using more N2 and H2, thus the amount of H2 will decrease
by KSong_1J
Sun Jan 12, 2020 7:18 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: "Quick way" part in Lecture
Replies: 7
Views: 64

Re: "Quick way" part in Lecture

If you decrease the volume in the system, then the reaction will favor the direction that has fewer moles of gas (since, according to Le Chatelier’s principle, when stress is applied to a system in equilibrium, the equilibrium will shift to reduce the effect of the stress). By reducing the volume, y...
by KSong_1J
Sun Jan 12, 2020 7:01 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: "Quick way" part in Lecture
Replies: 7
Views: 64

Re: "Quick way" part in Lecture

Did you mean to write something like “if volume decreases and there’s more moles of gas on the left, then the reaction shifts to the right” and “if volume decreases and there’s more moles of gas on the right, then the reaction shifts to the left”?
by KSong_1J
Sun Jan 12, 2020 6:40 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q>K
Replies: 9
Views: 53

Re: Q>K

Q is larger than K in situations where there is more products than reactants, in which case the reverse reaction will be favored so that Q = K
by KSong_1J
Sun Jan 12, 2020 6:38 pm
Forum: Ideal Gases
Topic: partial pressures
Replies: 7
Views: 55

Re: partial pressures

The ratio will be the same because (PO2)^3/(PO3)^2 is the formula for its equilibrium constant, K, which always stays the same whether more moles are added or not
by KSong_1J
Sun Jan 12, 2020 5:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc
Replies: 5
Views: 33

Re: Kc

I think you can use aqueous solutions and gases to solve for Kc but you don’t include solids or liquids
by KSong_1J
Sat Dec 07, 2019 10:09 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Practice Problem
Replies: 2
Views: 42

Re: Practice Problem

According to the textbook (Toolbox 9C.1),if it's not a negatively charged complex, you use iron instead of ferrate (ex. [FCl(OH2)5]+ is a pentaaquachlorido(II) ion
by KSong_1J
Sat Dec 07, 2019 9:54 pm
Forum: Calculating the pH of Salt Solutions
Topic: ph problem
Replies: 2
Views: 73

Re: ph problem

Ka is equal to [H+][A-]/[HA] and, for this equation, you can rewrite it as Ka = [H+]^2/[HA] because H+ and A- have the same concentration. To find the pH, you need to take the negative log of the H+ ions. Since they give you Ka and you know the concentration of the acid, you can just plug them in an...
by KSong_1J
Sat Dec 07, 2019 9:33 pm
Forum: Bronsted Acids & Bases
Topic: Strong Acids and Bases
Replies: 6
Views: 126

Re: Strong Acids and Bases

There's a table in the textbook (Fundamentals J) of the strong acids and bases that is pretty helpful! It's Table J.1 on page F75
by KSong_1J
Sat Dec 07, 2019 9:25 pm
Forum: Bronsted Acids & Bases
Topic: 6C.19
Replies: 2
Views: 79

Re: 6C.19

When it comes to oxoacids with the same number off oxygens attached to the central atom, the greater the electronegativity of the central atom, the stronger the acid. This is due to the fact that a greater electronegativity means it's more electron withdrawing. Therefore, HClO4 is stronger than H3PO...
by KSong_1J
Sat Dec 07, 2019 9:15 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: QUESTION 4 ON MIDTERM
Replies: 1
Views: 104

Re: QUESTION 4 ON MIDTERM

The solutions are on his website! Here's the link: https://lavelle.chem.ucla.edu/wp-conten ... rm_ans.pdf
by KSong_1J
Sun Dec 01, 2019 10:40 pm
Forum: General Science Questions
Topic: Bruincasts
Replies: 9
Views: 198

Re: Bruincasts

I don't think this class has recorded lectures/bruincast. The only recorded lectures he has are the audio-visual focus topics on his website that cover fundamentals and some topics of the quantum world.
by KSong_1J
Sun Dec 01, 2019 10:31 pm
Forum: Student Social/Study Group
Topic: Studying Videos
Replies: 3
Views: 55

Re: Studying Videos

Organic Chemistry Tutor and Professor Dave Explains on Youtube both have great videos for all those topics!
by KSong_1J
Sun Dec 01, 2019 10:29 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Textbook
Replies: 5
Views: 63

Re: Textbook

The textbook covers acids and bases in Fundamentals J and Chapter 6. In Lavelle's learning outcomes it says to look at Fundamentals J, Focus 6A.1-6A.3, 6B.1, 6C.3-6C.4, 6D.3, 6E.1 and Box 6E.1
by KSong_1J
Sun Dec 01, 2019 10:22 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Basic Acids and Bases Help
Replies: 3
Views: 56

Re: Basic Acids and Bases Help

^I agree, Organic Chemistry Tutor is a great resource as well as Professor Dave Explains on Youtube!
by KSong_1J
Sun Dec 01, 2019 10:20 pm
Forum: Bronsted Acids & Bases
Topic: Naming
Replies: 4
Views: 42

Re: Naming

I think we do because it was one of our homework problems (9C.3)
by KSong_1J
Sun Nov 24, 2019 6:25 pm
Forum: Naming
Topic: Polydentate
Replies: 1
Views: 37

Re: Polydentate

A polydentate is basically a ligand that can bind to the central atom at multiple sites (multiple atoms). An example of a monodentate would be H20 (the oxygen makes one bond with the central atom), a bidentate would be oxalate (the two oxygens that are not double bonded to the carbons can each form ...
by KSong_1J
Sun Nov 24, 2019 5:59 pm
Forum: Naming
Topic: Cobalt vs. Cobaltate
Replies: 4
Views: 36

Re: Cobalt vs. Cobaltate

-ate is used if the complex is an anion (is overall negatively charged), so that's when colbatlate would be used. If the complex has an overall positive charge, you would use cobalt.
by KSong_1J
Sun Nov 24, 2019 5:52 pm
Forum: Naming
Topic: Prefixes
Replies: 5
Views: 47

Re: Prefixes

You use those prefixes when a ligand is a polydentate or if it already has a prefix
by KSong_1J
Sun Nov 24, 2019 5:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Lecture
Replies: 3
Views: 40

Re: Lecture

I believe we still have to cover the acids and bases section before the final
by KSong_1J
Sun Nov 24, 2019 5:24 pm
Forum: Naming
Topic: using brackets
Replies: 5
Views: 47

Re: using brackets

You use brackets for anything within the coordination sphere (basically the complex)
by KSong_1J
Sun Nov 17, 2019 10:38 pm
Forum: Student Social/Study Group
Topic: Test 2
Replies: 11
Views: 117

Re: Test 2

I believe it’s everything we learned after the midterm up to/including sigma and pi bonds
by KSong_1J
Sun Nov 17, 2019 10:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: bond angles
Replies: 8
Views: 59

Re: bond angles

More lone pairs results in more electron-electron repulsion which pushes the atoms away. This results in smaller bond angles because the atoms move closer together.
by KSong_1J
Sun Nov 17, 2019 10:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: vsepr angles
Replies: 10
Views: 69

Re: vsepr angles

Yes you should memorize them for the upcoming test!
by KSong_1J
Sun Nov 17, 2019 10:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 10
Views: 71

Re: Lone Pairs

Lone pairs affect molecular geometry because the electron-electron repulsion causes the atoms to move further away
by KSong_1J
Sun Nov 17, 2019 10:10 pm
Forum: Hybridization
Topic: Test 2
Replies: 11
Views: 120

Re: Test 2

I don’t think hybridization is going to be covered on Test 2
by KSong_1J
Sun Nov 10, 2019 11:39 pm
Forum: Resonance Structures
Topic: Negative Charge
Replies: 3
Views: 35

Re: Negative Charge

You put a negative charge on the atom that’s more likely to gain the electron(s) in a bond!
by KSong_1J
Sun Nov 10, 2019 11:36 pm
Forum: Bond Lengths & Energies
Topic: Test 2 Topics
Replies: 40
Views: 706

Re: Test 2 Topics

I think it’s just everything we learn after the midterm!
by KSong_1J
Sun Nov 10, 2019 11:27 pm
Forum: Student Social/Study Group
Topic: Midterm Grades
Replies: 7
Views: 126

Re: Midterm Grades

I think I remember him saying we get our midterms back on Wednesday!
by KSong_1J
Sun Nov 10, 2019 10:06 pm
Forum: Sigma & Pi Bonds
Topic: Sigma vs Pi
Replies: 11
Views: 144

Re: Sigma vs Pi

You can find sigma bonds in single, double, and triple bonds while pi bonds are only found in double bonds (where there’s one sigma and one pi bond) and triple bonds (one sigma and two pi bonds).
by KSong_1J
Sun Nov 10, 2019 9:39 pm
Forum: Dipole Moments
Topic: Hydrogen Bonds
Replies: 4
Views: 35

Re: Hydrogen Bonds

N, O, and F form hydrogen bonds!
by KSong_1J
Sun Nov 03, 2019 11:46 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic bonds being held together
Replies: 3
Views: 40

Re: Ionic bonds being held together

They’re held together by electrostatic attraction (the attraction between atoms of opposite charges)
by KSong_1J
Sun Nov 03, 2019 11:44 pm
Forum: Photoelectric Effect
Topic: Best way to study for this topic?
Replies: 8
Views: 247

Re: Best way to study for this topic?

Definitely do the homework problems and also search up more problems online if you need more practice! To understand the topic better conceptually I recommend reading the textbook and watching videos about the topic online (the organic chemistry tutor on YouTube has really good ones)
by KSong_1J
Sun Nov 03, 2019 11:30 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 3
Views: 50

Re: Electron Configuration

You want to remove electrons from higher energy levels before moving onto lower energy levels, so you’ll want to remove them from the highest orbital. They’re also usually easier to remove because they’re further away from the nucleus
by KSong_1J
Sun Nov 03, 2019 11:26 pm
Forum: Quantum Numbers and The H-Atom
Topic: magnetic quantum number
Replies: 5
Views: 48

Re: magnetic quantum number

The magnetic quantum number describes the number of orbitals within a subshell and the orientation of the orbital; s will have a magnetic quantum number of 0, p can have one between -1 and 1, d can have between -2 and 2, and so on
by KSong_1J
Sun Nov 03, 2019 11:18 pm
Forum: Trends in The Periodic Table
Topic: Midterm Question Regarding Metals, Nonmetals, etc
Replies: 2
Views: 35

Re: Midterm Question Regarding Metals, Nonmetals, etc

I don’t think we’ll specifically asked to identify if the element is a metal, nonmetal, etc. but I think it’s still good information to know because you need it for many things (like naming, bonding, etc)
by KSong_1J
Sun Oct 27, 2019 10:58 pm
Forum: Resonance Structures
Topic: Midterm
Replies: 4
Views: 43

Re: Midterm

Anish Patel 4B wrote:Do you know if this also includes the material from the first test since it was high school stuff?


I think material from the first test is also included in the midterm!
by KSong_1J
Sun Oct 27, 2019 10:55 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Format
Replies: 11
Views: 156

Re: Midterm Format

I know it's still weeks away but I was wondering, does anyone know about the format of the midterm? Is it comparable to Test 1 but just longer in length? What types of questions will be on it and which units does it cover? Where is the midterm located? Will that be announced closer to the midterm d...
by KSong_1J
Sun Oct 27, 2019 10:50 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Bonds
Replies: 14
Views: 152

Re: Covalent Bonds

Yes, covalent bonds are only between two nonmetals! If you have a metal-nonmetal bond it's an ionic bond and a metal-metal is a metallic bond.
by KSong_1J
Sun Oct 27, 2019 10:42 pm
Forum: Ionic & Covalent Bonds
Topic: Resonance Structures
Replies: 5
Views: 45

Re: Resonance Structures

I think you have to use the dots to represent the two electrons on the oxygen
by KSong_1J
Sun Oct 27, 2019 10:41 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Advice for studying
Replies: 58
Views: 1316

Re: Advice for studying

For studying I definitely recommend reading the textbook chapters (which helps a lot with conceptual understanding of topics), doing all the homework problems, and just searching up youtube videos of topics you don't fully understand!
by KSong_1J
Sun Oct 20, 2019 11:01 pm
Forum: Properties of Light
Topic: Homework 4
Replies: 4
Views: 64

Re: Homework 4

I think we can still do questions under quantum world since it falls under the category of “recently covered material”
by KSong_1J
Sun Oct 20, 2019 10:53 pm
Forum: Student Social/Study Group
Topic: Week 4 HW Problems
Replies: 7
Views: 121

Re: Week 4 HW Problems

I think it can be from both. In the syllabus it says to hand in homework from recently covered material so I believe either should be fine (it also could depend on your discussion section; for example if you had yours on Tuesday, we haven’t really gone over Chemical bonds yet so I don’t think they’d...
by KSong_1J
Sun Oct 20, 2019 10:43 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1F.19
Replies: 3
Views: 40

Re: 1F.19

Since s-block metals have lower ionization energies, they’re more likely to give away their electrons which makes them more reactive
by KSong_1J
Sun Oct 20, 2019 10:32 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers: Size of An Atom
Replies: 4
Views: 43

Re: Quantum Numbers: Size of An Atom

n is related to the size and energy of the orbital; as n (aka the energy level) increases, the mean distance of an electron from the nucleus increases, which means the radius of the atom gets larger.
by KSong_1J
Sun Oct 20, 2019 10:24 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Writing Electron Configurations
Replies: 2
Views: 34

Re: Writing Electron Configurations

In general, you would follow the order of s, p, d, f but I think there are some special cases in which you don’t follow that order (for example, copper)
by KSong_1J
Sun Oct 13, 2019 10:21 pm
Forum: General Science Questions
Topic: Powerpoint Slides
Replies: 4
Views: 83

Re: Powerpoint Slides

I don’t think he posts his slides, but the audio-visual focus topics do go over what he talks about in class (though they only seem to be available for fundamentals and quantum world).
by KSong_1J
Sun Oct 13, 2019 10:11 pm
Forum: Properties of Electrons
Topic: Photon
Replies: 5
Views: 31

Re: Photon

Photons are basically particles of energy that make up light
by KSong_1J
Sun Oct 13, 2019 10:02 pm
Forum: Properties of Light
Topic: 1B #19
Replies: 1
Views: 22

Re: 1B #19

To calculate the different wavelengths, use de Broglie’s equation (λ = h/mv) and you just search up the mass of the proton and neutron because they’re set values and plug those in for m, plug in 2.75 x 10^5m/s for v, and plug in Planck’s constant for h: Proton: (6.626 x 10^-34Js)/(1.673 x 10^-27kg)(...
by KSong_1J
Sun Oct 13, 2019 9:23 pm
Forum: Photoelectric Effect
Topic: Wavelength, Frequency, and Intensity
Replies: 7
Views: 64

Re: Wavelength, Frequency, and Intensity

Light is made up of photons and the photon’s energy is dependent on its wavelength; longer wavelengths of light have less energy than shorter wavelengths, which is why the shorter wavelengths are able to eject the electrons (since they have more energy and you need to reach a certain threshold to ej...
by KSong_1J
Sun Oct 13, 2019 9:02 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 3
Views: 45

Re: Photoelectric Effect

No, the surface must be metal to exhibit the photoelectric effect because you have to be able to completely remove the electron in order to achieve the effect. Since metals are able to donate/spare electrons while non-metals can’t, only metals will work.
by KSong_1J
Sun Oct 06, 2019 9:39 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 3
Views: 37

Re: Sig Figs

Sig figs are basically like a way to round. Khan Academy is a great resource to learn more about the basics of sig figs :)
by KSong_1J
Sun Oct 06, 2019 9:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Specific type of calculator for tests?
Replies: 6
Views: 93

Re: Specific type of calculator for tests?

I think we have to use scientific calculators for tests!
by KSong_1J
Sun Oct 06, 2019 9:15 pm
Forum: Significant Figures
Topic: Reviewing Sig Figs
Replies: 3
Views: 65

Re: Reviewing Sig Figs

For sig fig practice I like using Khan Academy or if you just search up “sig fig practice,” some good websites for practice will pop up (like sciencegeek.net)!
by KSong_1J
Sun Oct 06, 2019 9:10 pm
Forum: Balancing Chemical Reactions
Topic: Fractions
Replies: 20
Views: 438

Fractions

I know this was kind of addressed in a question someone asked earlier but I just wanted to ask if we would be marked down if we left the stoichiometric coefficient as a fraction? I know different professors prefer different things so I just wanted to clarify to see if it would necessarily be seen as...

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