Search found 112 matches

by AlyshaP_2B
Sun Mar 15, 2020 8:04 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: catalyst vs intermediate
Replies: 3
Views: 45

Re: catalyst vs intermediate

An intermediate is formed during one step and used up during another, whereas a catalyst does not get used up.
by AlyshaP_2B
Fri Mar 13, 2020 7:27 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 7th Edition Problem 7D.5
Replies: 3
Views: 113

Re: 7th Edition Problem 7D.5

The 1.8 comes from doing e^(0.59), which you should do to eliminate the ln from the left side!
by AlyshaP_2B
Wed Mar 11, 2020 6:18 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: Activation Energy
Replies: 7
Views: 429

Re: Activation Energy

Activation energy is the amount of energy needed for a specific reaction to occur. When energy input is needed, the reaction is endergonic, and when energy is released, the reaction is exergonic.
by AlyshaP_2B
Wed Mar 11, 2020 6:09 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysis
Replies: 11
Views: 77

Re: Catalysis

Catalysis results in lowering the activation energy for a reaction to proceed, thus increasing the rate constant.
by AlyshaP_2B
Wed Mar 11, 2020 6:07 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activation Energy and the Rate Constant
Replies: 4
Views: 39

Re: Activation Energy and the Rate Constant

When activation energy decreases, the reaction will proceed faster since there is less energy required for molecules to react upon collision, so the rate constant increases.
by AlyshaP_2B
Wed Mar 11, 2020 6:05 pm
Forum: General Science Questions
Topic: Chemistry Final
Replies: 16
Views: 357

Re: Chemistry Final

CCLE usually has options for a variety of different formats, so I wouldn't count on the exam being all multiple choice.
by AlyshaP_2B
Wed Mar 11, 2020 6:01 pm
Forum: General Rate Laws
Topic: Rate Determining Step
Replies: 5
Views: 38

Re: Rate Determining Step

Yes, the step with the slowest rate is the rate determining step for the reaction!
by AlyshaP_2B
Mon Mar 02, 2020 7:02 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Water in Cell Diagrams
Replies: 2
Views: 39

Re: Water in Cell Diagrams

Water should always be left out of cell diagrams
by AlyshaP_2B
Mon Mar 02, 2020 7:02 pm
Forum: Administrative Questions and Class Announcements
Topic: Test Two
Replies: 5
Views: 74

Re: Test Two

I think your best bet would be to go to the Peer Learning Sessions for extra help!
by AlyshaP_2B
Mon Mar 02, 2020 7:01 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs free energy equations
Replies: 5
Views: 71

Re: Gibbs free energy equations

You mostly will need to use ∆G = -nFE˚and ∆G = -RTlnK, and sometimes a combination of both depending on what the question is asking.
by AlyshaP_2B
Mon Mar 02, 2020 7:00 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: determine n
Replies: 16
Views: 561

Re: determine n

n is the number of moles of electrons you have in your half reactions
by AlyshaP_2B
Mon Mar 02, 2020 6:58 pm
Forum: Balancing Redox Reactions
Topic: Oxidation number of 03
Replies: 2
Views: 35

Re: Oxidation number of 03

I'm pretty sure it's 0!
by AlyshaP_2B
Thu Feb 27, 2020 5:41 pm
Forum: Administrative Questions and Class Announcements
Topic: UA sessions
Replies: 5
Views: 54

Re: UA sessions

Most UAs are very helpful in answering questions especially during the drop ins! In the other sessions they usually come with practice questions but are still open to questions from students especially at the end.
by AlyshaP_2B
Thu Feb 27, 2020 5:40 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: How to tell which is anode/cathode based on standard reduction potentials E
Replies: 5
Views: 26

Re: How to tell which is anode/cathode based on standard reduction potentials E

You want the cell to be spontaneous, so you have to check which number being flipped would result in the more positive number.
by AlyshaP_2B
Thu Feb 27, 2020 5:37 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Standard electron potential
Replies: 2
Views: 22

Re: Standard electron potential

A larger value of the standard reduction potentials means it is harder for the element to be reduced.
by AlyshaP_2B
Thu Feb 27, 2020 5:35 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Drawing Cell Diagram
Replies: 7
Views: 80

Re: Drawing Cell Diagram

No, you just need to include the compound and its state
by AlyshaP_2B
Thu Feb 27, 2020 5:32 pm
Forum: General Science Questions
Topic: Test 2
Replies: 16
Views: 312

Re: Test 2

Test 2 will cover the last page of the thermodynamics outline and all of the electrochemistry outline!
by AlyshaP_2B
Thu Feb 20, 2020 6:14 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox Reactions
Replies: 5
Views: 45

Re: Balancing Redox Reactions

As long as your equation is balanced and you have the reactants and products on their respective sides, you should be fine!
by AlyshaP_2B
Thu Feb 20, 2020 6:12 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: salt bridge
Replies: 5
Views: 47

Re: salt bridge

The salt bridge allows ions to move between the two solvents, preventing a stop in the flow of electrons due to too high of a charge accumulating in one solvent.
by AlyshaP_2B
Thu Feb 20, 2020 6:10 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: calculating E(cell)
Replies: 2
Views: 20

Re: calculating E(cell)

Lavelle said that the second method (drawing out the diagram and figuring out which sign needs to be switched) is the better option out of the two we learned.
by AlyshaP_2B
Thu Feb 20, 2020 6:09 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: standard hydrogen electrode
Replies: 3
Views: 37

Re: standard hydrogen electrode

The SHE can be used to measure the standard reduction potential of different elements.
by AlyshaP_2B
Thu Feb 20, 2020 6:09 pm
Forum: Balancing Redox Reactions
Topic: Test 2 [ENDORSED]
Replies: 12
Views: 141

Re: Test 2 [ENDORSED]

Test 2 is now week 9 and it will cover the rest of outline 4 and all of outline 5
by AlyshaP_2B
Thu Feb 13, 2020 7:09 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: equilibrium concentrations
Replies: 7
Views: 67

Re: equilibrium concentrations

Concentrations give the molarity, so that would be moles/liter.
by AlyshaP_2B
Thu Feb 13, 2020 7:08 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Midterm Curve
Replies: 45
Views: 504

Re: Midterm Curve

Dina 2k wrote:how soon does he usually have it graded and back to us?


For 14A I think we got our exam back around a week and a half after the day of the midterm!
by AlyshaP_2B
Thu Feb 13, 2020 7:07 pm
Forum: Administrative Questions and Class Announcements
Topic: homework
Replies: 3
Views: 45

Re: homework

I think you should be fine with any topic this week because of the midterm!
by AlyshaP_2B
Thu Feb 13, 2020 7:04 pm
Forum: General Science Questions
Topic: Tutoring
Replies: 6
Views: 148

Re: Tutoring

Office hours during weeks that don't have exams are usually really helpful because you can ask your specific questions!
by AlyshaP_2B
Tue Feb 04, 2020 2:27 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Topics on the Midterm
Replies: 22
Views: 224

Re: Topics on the Midterm

I think by the end of this week we will have gone over most of thermodynamics, so the midterm will include outlines 1-4.
by AlyshaP_2B
Tue Feb 04, 2020 2:24 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: C = K?
Replies: 5
Views: 84

Re: C = K?

Even though the units are different, an increase of 1 unit Kelvin is equivalent to an increase of 1 unit Celsius. Since this equation uses delta T rather than just T, you can use the same number without having to do any conversions.
by AlyshaP_2B
Tue Feb 04, 2020 2:22 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 6
Views: 68

Re: Midterm

Many of the constants and equations we use will be given, but there are also some that I think we will just be expected to know. I would focus on the ones Lavelle spent the most time on in lecture and also be sure to understand the relationships between all of the different equations.
by AlyshaP_2B
Mon Feb 03, 2020 11:06 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: endo vs exo
Replies: 8
Views: 43

Re: endo vs exo

Forming a bond releases energy and therefore is exothermic, while breaking a bond requires an input of energy and therefore is endothermic.
by AlyshaP_2B
Tue Jan 28, 2020 11:40 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Order of homework for Thermochem unit
Replies: 6
Views: 64

Re: Order of homework for Thermochem unit

In discussion section for this week, my TA went over 4D and 4E topics.
by AlyshaP_2B
Tue Jan 28, 2020 11:40 pm
Forum: Phase Changes & Related Calculations
Topic: Units
Replies: 16
Views: 145

Re: Units

The two are interchangeable here because we only look at temperature in terms of how it changes, and one unit kelvin is equivalent to one unit celsius.
by AlyshaP_2B
Tue Jan 28, 2020 11:39 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Best Method of the 3 Given?
Replies: 7
Views: 54

Re: Best Method of the 3 Given?

Using bond enthalpies is the least accurate because the values used are averages, so they are not always reliable for the specific molecule in a given question.
by AlyshaP_2B
Tue Jan 28, 2020 11:37 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Homework sections
Replies: 7
Views: 80

Re: Homework sections

Lavelle seems to be working backwards through this topic. We have covered at least 4D and 4E as of now.
by AlyshaP_2B
Tue Jan 28, 2020 11:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Test One
Replies: 2
Views: 40

Re: Test One

Your TA will pass back your test during discussion section this week!
by AlyshaP_2B
Mon Jan 20, 2020 7:01 pm
Forum: Student Social/Study Group
Topic: Test 1
Replies: 9
Views: 147

Re: Test 1

There isn't a practice test posted but going through the assigned homework problems is usually a good way to get practice!
by AlyshaP_2B
Mon Jan 20, 2020 6:59 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Writing K Expression
Replies: 6
Views: 52

Re: Writing K Expression

If H2O is a gas in a given question, you should use it in your calculations for K or Q.
by AlyshaP_2B
Mon Jan 20, 2020 6:58 pm
Forum: Student Social/Study Group
Topic: test 1
Replies: 7
Views: 90

Re: test 1

The free response questions are usually similar to the homework questions assigned and examples done in class!
by AlyshaP_2B
Mon Jan 20, 2020 6:55 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Module
Replies: 4
Views: 54

Re: Module

Calculating Q requires molarity, not moles, so you need to divide by the volume to get the correct values!
by AlyshaP_2B
Mon Jan 20, 2020 6:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Coverting Kp to Kc
Replies: 2
Views: 37

Re: Coverting Kp to Kc

I don't think you will need to do that, you should just use it in whatever form it is given to you and as long as you stay consistent it should get you the correct answer!
by AlyshaP_2B
Sun Jan 19, 2020 7:48 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Problem 12.69
Replies: 6
Views: 1060

Re: Problem 12.69

Rosa Munoz 2E wrote:I am confused as well on why you can use the Kb value for NH3

You can use the Kb value for NH3 to find the Ka value of NH4Cl because they are a conjugate acid/base pair
by AlyshaP_2B
Wed Jan 15, 2020 9:06 am
Forum: Administrative Questions and Class Announcements
Topic: Test 1
Replies: 7
Views: 88

Re: Test 1

Test 1 will probably cover Outlines 1 and 2 on his website!
by AlyshaP_2B
Wed Jan 15, 2020 9:03 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Autoprotolysis
Replies: 8
Views: 74

Re: Autoprotolysis

Autoprotolysis is the naturally occurring transfer of protons between the same type of molecule.
by AlyshaP_2B
Wed Jan 15, 2020 9:02 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When to approximate
Replies: 5
Views: 52

Re: When to approximate

If the percent protonation is less than 5%, you can assume that your approximation was appropriate.
by AlyshaP_2B
Wed Jan 15, 2020 8:58 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE charts on tests/exams
Replies: 8
Views: 67

Re: ICE charts on tests/exams

I would say it's always better to show extra work rather than not enough!
by AlyshaP_2B
Wed Jan 15, 2020 8:57 am
Forum: Administrative Questions and Class Announcements
Topic: Study Guide Test One
Replies: 17
Views: 193

Re: Study Guide Test One

I don't think so, but the outlines are good resources to use while studying!
by AlyshaP_2B
Wed Jan 08, 2020 6:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K for Gases
Replies: 12
Views: 96

Re: K for Gases

When the reaction is dealing with gases, I believe you should use Kp.
by AlyshaP_2B
Wed Jan 08, 2020 6:10 pm
Forum: Ideal Gases
Topic: Solids and Liquids
Replies: 7
Views: 84

Re: Solids and Liquids

During lecture, Lavelle said solids are excluded because they don't have molar concentrations, and liquids are excluded because the solvent concentration stays the same.
by AlyshaP_2B
Wed Jan 08, 2020 6:07 pm
Forum: Student Social/Study Group
Topic: Discussion Sections
Replies: 7
Views: 96

Re: Discussion Sections

Yes, there are discussion sections during Week 1.
by AlyshaP_2B
Wed Jan 08, 2020 6:06 pm
Forum: Ideal Gases
Topic: R constant in PV=nRT
Replies: 9
Views: 68

Re: R constant in PV=nRT

I think the gas constant will be given to us either in the question or on an equation sheet!
by AlyshaP_2B
Tue Jan 07, 2020 4:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework 1
Replies: 18
Views: 248

Re: Homework 1

Since some sections are earlier in the week, week 1 homework is due to your ta at the end of lecture on Friday.
by AlyshaP_2B
Sat Dec 07, 2019 10:58 am
Forum: Bronsted Acids & Bases
Topic: HCl vs HClO
Replies: 2
Views: 55

Re: HCl vs HClO

I think this is because the conjugate base of HCl is more stable than that of HClO.
by AlyshaP_2B
Wed Dec 04, 2019 8:34 am
Forum: Bronsted Acids & Bases
Topic: Acids and Bases
Replies: 2
Views: 46

Re: Acids and Bases

Nawal Dandachi 3G wrote:Acetic acid is a stronger acid because it is stabilized by resonance.

So for this question you would have to draw out the lewis structure to determine if there is resonance and if there is then that one is stronger?
by AlyshaP_2B
Wed Dec 04, 2019 8:31 am
Forum: Bronsted Acids & Bases
Topic: CaO
Replies: 10
Views: 116

Re: CaO

305416361 wrote:CaO is a strong base because it fully dissociates into its constituent components

Is this just something we would have to memorize? How do we know if it will completely dissociate in water?
by AlyshaP_2B
Mon Dec 02, 2019 8:18 am
Forum: Industrial Examples
Topic: What do we need to know?
Replies: 15
Views: 312

Re: What do we need to know?

I think overall it would be a good idea to understand the details of specific biological examples from class because he spent a good amount of time going into some of those examples pretty thoroughly.
by AlyshaP_2B
Mon Dec 02, 2019 8:17 am
Forum: Administrative Questions and Class Announcements
Topic: Lavelle review sessions
Replies: 3
Views: 70

Re: Lavelle review sessions

He might go over some previous test questions like he did for the midterm, but other than that I think review sessions for the final will be similar to how they were for the midterm.
by AlyshaP_2B
Mon Dec 02, 2019 8:16 am
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Community Posts
Replies: 10
Views: 171

Re: Chemistry Community Posts

I think different TAs do it differently, but by the end of the quarter all of your points should be added in.
by AlyshaP_2B
Mon Dec 02, 2019 8:15 am
Forum: Administrative Questions and Class Announcements
Topic: Calculators on Final
Replies: 6
Views: 83

Re: Calculators on Final

I'm pretty sure we'll need our calculators during the final, especially for pre-midterm concepts that were very calculation heavy.
by AlyshaP_2B
Mon Dec 02, 2019 8:14 am
Forum: Student Social/Study Group
Topic: Final topics
Replies: 10
Views: 116

Re: Final topics

The exam is cumulative, but may focus more on topics post midterm since we've already been tested on previous concepts on the midterm.
by AlyshaP_2B
Mon Nov 25, 2019 8:17 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: minimum coordination number
Replies: 2
Views: 40

Re: minimum coordination number

I think it's possible, but it isn't very common.
by AlyshaP_2B
Mon Nov 25, 2019 8:13 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle of Single Electron of A Free Radical
Replies: 4
Views: 249

Re: Bond Angle of Single Electron of A Free Radical

I think we are supposed to consider a radical the same as a lone pair, it's one region of electron density.
by AlyshaP_2B
Mon Nov 25, 2019 8:09 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: brackets
Replies: 13
Views: 140

Re: brackets

The bracket signifies a coordination sphere.
by AlyshaP_2B
Mon Nov 25, 2019 8:07 am
Forum: Naming
Topic: Naming
Replies: 3
Views: 43

Re: Naming

I believe we need to know how do do it because one of the objectives on Outline 5 is "Be familiar with the rules for naming coordination compounds."
by AlyshaP_2B
Mon Nov 25, 2019 8:04 am
Forum: Student Social/Study Group
Topic: Test 2 and Final
Replies: 18
Views: 226

Re: Test 2 and Final

205150314 wrote:Does anyone know if we will get some sort of study tools again?

I'm sure Lavelle will be coordinating review sessions like he did for the midterm.
by AlyshaP_2B
Thu Nov 21, 2019 1:10 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Ordering Intermolecular Forces Clarification
Replies: 2
Views: 59

Re: Ordering Intermolecular Forces Clarification

Dipole dipole is the strongest, followed by dipole induced dipole. London dispersion forces are the weakest, but if you have a lot of them they can add up and be strong.
by AlyshaP_2B
Thu Nov 21, 2019 1:06 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Carbon Monoxide
Replies: 3
Views: 40

Re: Carbon Monoxide

Oxygen is more electronegative than carbon, so there will be a dipole moment there which should make this molecule polar.
by AlyshaP_2B
Thu Nov 21, 2019 1:04 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Homework 3F3
Replies: 5
Views: 73

Re: Homework 3F3

Any time the central atom is surrounded by two or more different atoms in a tetrahedral, there will be dipole dipole forces.
by AlyshaP_2B
Thu Nov 21, 2019 1:00 am
Forum: Hybridization
Topic: for test 2
Replies: 7
Views: 79

Re: for test 2

No, hybridization will not be on test 2!
by AlyshaP_2B
Mon Nov 18, 2019 9:00 am
Forum: Determining Molecular Shape (VSEPR)
Topic: AXE notation
Replies: 10
Views: 111

Re: AXE notation

Knowing this formula will help you identify the shape and geometry more easily than trying to do individual molecules!
by AlyshaP_2B
Wed Nov 13, 2019 8:26 am
Forum: Lewis Structures
Topic: Biradical
Replies: 2
Views: 38

Re: Biradical

Lavelle touched on this very very briefly so I don't think we are expected to know any details about this concept.
by AlyshaP_2B
Wed Nov 13, 2019 8:23 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing Power
Replies: 4
Views: 137

Re: Polarizing Power

Many different ions may have the same charge, so at that point you can use the size to determine polarizing power. Smaller = more polarizing power.
by AlyshaP_2B
Wed Nov 13, 2019 8:21 am
Forum: Electronegativity
Topic: Ionization Energy vs. Electronegativity
Replies: 9
Views: 189

Re: Ionization Energy vs. Electronegativity

Both have similar periodic table trends, increasing as you move to the top right corner.
by AlyshaP_2B
Wed Nov 13, 2019 8:20 am
Forum: Bond Lengths & Energies
Topic: Homework for week 7
Replies: 5
Views: 62

Re: Homework for week 7

I think questions from the end of the Chemical Bonds outline should be fine. However, it might be more beneficial to do questions on the next outline.
by AlyshaP_2B
Wed Nov 13, 2019 8:14 am
Forum: Administrative Questions and Class Announcements
Topic: Homework for week 7
Replies: 3
Views: 57

Re: Homework for week 7

I think problems from the last sections of the Chemical Bonds outline should be fine for this week!
by AlyshaP_2B
Wed Nov 06, 2019 8:16 am
Forum: General Science Questions
Topic: Midterm: Paramagnetic and Diamagnetic
Replies: 1
Views: 50

Re: Midterm: Paramagnetic and Diamagnetic

I don't think we need to know these terms since Lavelle never mentioned them.
by AlyshaP_2B
Tue Nov 05, 2019 11:01 pm
Forum: Trends in The Periodic Table
Topic: Midterm Review Problem 10 d
Replies: 5
Views: 175

Re: Midterm Review Problem 10 d

Oxygen has a lower ionization energy than Nitrogen because of the 4th electron joining. Having 2 electrons in the same orbital increases the electron repulsion, making Oxygen more likely to want to give up an electron.
by AlyshaP_2B
Tue Nov 05, 2019 10:58 pm
Forum: Dipole Moments
Topic: Dipole, midterm?
Replies: 7
Views: 120

Re: Dipole, midterm?

I'm pretty sure we'll just be asked to draw the dipole moment on a Lewis structure, which is just adding an arrow that points in the direction the electron is moving.
by AlyshaP_2B
Tue Nov 05, 2019 10:50 pm
Forum: Properties of Electrons
Topic: Work Function
Replies: 4
Views: 172

Re: Work Function

A lot of the practice questions convert it to J/mol so that's probably your best bet. Just make sure your units cancel out while you're doing the equations and you should be fine.
by AlyshaP_2B
Tue Nov 05, 2019 10:48 pm
Forum: Photoelectric Effect
Topic: Light acts as a wave
Replies: 4
Views: 190

Re: Light acts as a wave

The photoelectric effect tells us that light is quantized into packets of energy (photons). De Broglie's equation is the one that supports the idea of electrons being able to have wave like properties!
by AlyshaP_2B
Mon Nov 04, 2019 1:03 pm
Forum: Administrative Questions and Class Announcements
Topic: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
Replies: 53
Views: 3410

Re: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE

Chem_Mod wrote:Here is the key for worksheet on the quantum world.


Is there a different key with the answers to the last two questions on this worksheet? This answer key only has up until question 6 and I wanted to check my answers for number 7 and 8 on the worksheet!
by AlyshaP_2B
Mon Nov 04, 2019 9:08 am
Forum: *Shrodinger Equation
Topic: Schrodinger relationships
Replies: 4
Views: 197

Re: Schrodinger relationships

Schrodinger’s equation uses a wave function to describe an electron because of its wavelike properties and indeterminacy in momentum and position. The wave function represents the orbital (position) that and electron can be found. Do we just have to know the concepts behind Schrodinger's equation? ...
by AlyshaP_2B
Mon Nov 04, 2019 9:04 am
Forum: Electronegativity
Topic: Trend of Electronegativity
Replies: 22
Views: 412

Re: Trend of Electronegativity

Electronegativity increases up the periodic table and towards the right. Fluorine is the most electronegative element.
by AlyshaP_2B
Mon Nov 04, 2019 9:03 am
Forum: Dipole Moments
Topic: Dipole Arrow
Replies: 5
Views: 48

Re: Dipole Arrow

During lecture, Lavelle said an easy way to remember the direction of the arrow is that it's pointing in the direction that the electron is moving.
by AlyshaP_2B
Wed Oct 30, 2019 9:03 am
Forum: Lewis Structures
Topic: Resonance
Replies: 4
Views: 39

Re: Resonance

In addition to the previously given definitions, Lavelle also mentioned in class that resonance leads to more stable and less reactive molecules because it results in multiple bond characteristics being spread out throughout a molecule, lowering its energy.
by AlyshaP_2B
Wed Oct 30, 2019 8:57 am
Forum: Ionic & Covalent Bonds
Topic: 2A.5 (d-block configurations)
Replies: 4
Views: 42

Re: 2A.5 (d-block configurations)

For ions, it's easiest to first write out the regular electron configuration and then add or take away electrons depending on the charge. Since full and half filled d shells are more stable, those should be filled before the 4s. For Cu, the electron configuration is [Ar] 3d104s1, and when the charge...
by AlyshaP_2B
Wed Oct 30, 2019 8:53 am
Forum: Ionic & Covalent Bonds
Topic: Atomic and ionic radii
Replies: 3
Views: 51

Re: Atomic and ionic radii

The atomic radius is half the diameter of a neutral atom, measuring across the outer electrons. The ionic radius is half the distance between two gas atoms that are joined by an ionic bond. Both generally have the same periodic table trend: radius decreases moving across a period and increases movin...
by AlyshaP_2B
Wed Oct 30, 2019 8:49 am
Forum: Octet Exceptions
Topic: List of Octet exceptions
Replies: 6
Views: 112

Re: List of Octet exceptions

Usually, non-metals with a d-subshell can have expanded octets because there are more spaces for electrons to fill
by AlyshaP_2B
Tue Oct 29, 2019 10:59 am
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 4
Views: 63

Re: Drawing Lewis Structures

I think it would be best to play it safe and draw the structure with the lower formal charge because that is the one that is most stable and most likely to be an accurate representation.
by AlyshaP_2B
Tue Oct 29, 2019 10:52 am
Forum: Ionic & Covalent Bonds
Topic: Study For midterm
Replies: 7
Views: 93

Re: Study For midterm

I think homework questions would be the most efficient way to study because practicing the same types of questions as the exam will have will be a good way to prepare!
by AlyshaP_2B
Mon Oct 21, 2019 10:06 am
Forum: *Black Body Radiation
Topic: electromagnetic radiation 2
Replies: 3
Views: 176

Re: electromagnetic radiation 2

Energy and wavelength are inversely proportional. Radio waves are longer, so they have less energy than UV.
by AlyshaP_2B
Mon Oct 21, 2019 10:04 am
Forum: Photoelectric Effect
Topic: Threshold Energy
Replies: 7
Views: 124

Re: Threshold Energy

I believe that saying there is 0 KE means that after the electron has been ejected, there is no excess energy leftover that would be considered Kinetic Energy. When the energies match up, all of it is used to eject the electron so there will be 0 KE.
by AlyshaP_2B
Mon Oct 21, 2019 9:59 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Probability of finding an electron at a certain location
Replies: 4
Views: 59

Re: Probability of finding an electron at a certain location

In the textbook chapters, I believe this concept only came up when referencing where electrons had 0 density or a "nonzero density." Since there weren't any homework questions assigned, I don't anticipate needing to know too many details about this concept!
by AlyshaP_2B
Mon Oct 21, 2019 9:52 am
Forum: Student Social/Study Group
Topic: Week 4 HW Problems
Replies: 7
Views: 135

Re: Week 4 HW Problems

I think most TAs are flexible about what homework you turn in! As long as the material is recent, I think you should be fine.
by AlyshaP_2B
Mon Oct 21, 2019 9:48 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Short Hand or Normal Way?
Replies: 3
Views: 71

Re: Short Hand or Normal Way?

I think he will specify! However, when going through them in class he usually defaulted to using the shorthand, so I would expect that to be what's asked of us on the exams unless specified otherwise.
by AlyshaP_2B
Mon Oct 21, 2019 9:47 am
Forum: Quantum Numbers and The H-Atom
Topic: Spin and orbitals
Replies: 4
Views: 47

Re: Spin and orbitals

I believe Dr.Lavelle said it was because at that point in energy levels, electron repulsion comes into play so it's more stable to have parallel spins before filling in the paired spin electrons
by AlyshaP_2B
Thu Oct 17, 2019 1:13 pm
Forum: DeBroglie Equation
Topic: Constant Question
Replies: 7
Views: 124

Re: Constant Question

I don't think it will change your answer too much, but if you're rounding at multiple steps during the process then your final answer won't be as accurate as it could. If possible, I would avoid rounding as much as possible until getting to the final step.
by AlyshaP_2B
Mon Oct 14, 2019 8:09 am
Forum: Student Social/Study Group
Topic: Best Sessions
Replies: 12
Views: 174

Re: Best Sessions

The Step-Up sessions in Covel that I have gone to have had about 15 students and 1 LA leading and going through practice problems. They do a really good job of breaking the questions down so if you're struggling with a topic or just want extra clarification, those would be great resource. However, i...
by AlyshaP_2B
Mon Oct 14, 2019 8:02 am
Forum: Properties of Light
Topic: Angstrom
Replies: 10
Views: 106

Re: Angstrom

I think the units will be clarified in the questions. If they aren't, I would probably stick to one of the more conventional ones such as m or nm!
by AlyshaP_2B
Mon Oct 14, 2019 8:00 am
Forum: Properties of Light
Topic: MidTerms and Finals
Replies: 11
Views: 131

Re: MidTerms and Finals

I believe the midterm and final are both outside of class/section hours! There is "Test and Exam Schedule" on Lavelle's website with details for both.

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